Drinking Water Compliance Center

Three references side by side — the federal drinking-water rules (40 CFR Part 141), the DoD Overseas Environmental Baseline Guidance Document, and the DoD/Navy PFAS policy track. Pick a tab, then search any parameter or program.

FEDERAL · 40 CFR PART 141PAGE UPDATED 2026-10-05REVIEWED MONTHLY

Key threshold — Underground Source of Drinking Water (USDW), 40 CFR 144.3. An aquifer counts as a USDW if it supplies or could supply a public water system and contains fewer than 10,000 mg/L total dissolved solids (and is not an exempted aquifer). Above 10,000 mg/L TDS, the formation is generally considered too saline to be a current or future drinking-water source.

Have your own standard (FGS, state rule, client limits)? Compare it against this table →

Lead and Copper Rule (LCR / LCRI)

40 CFR 141 Subpart I (§§141.80–141.91)

Action-level rule driven by 90th-percentile tap sampling. Exceeding an action level triggers corrosion treatment, public education, and service-line replacement — not an MCL violation. The 2024 Lead and Copper Rule Improvements (LCRI) lower the lead action level to 0.010 mg/L effective November 1, 2027, and require a service-line inventory plus replacement plan.

Parameter	Limit	Type	Method	Detection limit	Cite
Lead 90th percentile. LCRI lowers federal AL to 0.010 mg/L effective 11/1/2027.	0.015 mg/L	AL	EPA 200.8	PQL 0.005	40 CFR 141 Subpart I
Copper 90th percentile. LCRI retains 1.3 mg/L.	1.3 mg/L	AL	EPA 200.8	—	40 CFR 141 Subpart I

2 parameters · detection limits are laboratory PQLs — confirm the current approved method list with your certified lab.

Revised Total Coliform Rule (RTCR)

40 CFR 141 Subpart Y (§§141.851–141.861)

No MCL for total coliform — instead, coliform detections trigger assessments and corrective action (treatment technique). E. coli positives carry MCL consequences. Requires routine distribution-system sampling with repeat and triggered source-water monitoring.

Parameter	Limit	Type	Method	Detection limit	Cite
E. coli Treatment-technique rule: MCL violation on E. coli-positive repeat or TC-positive routine combinations.	0 positive samples	MCL	EPA 1603 / Colilert	—	40 CFR 141.860
Total coliform — system assessments Treatment-technique rule: assessments and corrective action on coliform triggers.	TT	TT	SM 9223	—	40 CFR 141.859
Ground Water Rule — source monitoring Treatment-technique rule: triggered and additional source-water monitoring.	TT	TT	—	—	40 CFR 141 Subpart S
Surface-water filtration and disinfection Treatment-technique rule: minimum inactivation requirements.	TT	TT	—	—	40 CFR 141 Subpart H
Turbidity (filtered systems) Treatment-technique rule.	≤0.3 NTU in 95% of samples; max 1 NTU	TT	EPA 180.1	—	40 CFR 141.73

5 parameters · detection limits are laboratory PQLs — confirm the current approved method list with your certified lab.

Related tools: Compliance Monitoring Planner →

Disinfection Byproducts Rules (Stage 1 & Stage 2 DBPR)

40 CFR 141 Subpart L (Stage 1: §§141.130–141.135; Stage 2: §§141.620–141.629)

MCLs for TTHM, HAA5, bromate, and chlorite; MRDLs for chlorine, chloramines, and chlorine dioxide. Stage 2 compliance uses the locational running annual average (LRAA) — each monitoring location must meet the MCL on its own.

Parameter	Limit	Type	Method	Detection limit	Cite
Total trihalomethanes (TTHM) Sum of 4 THMs; locational running annual average	0.080 mg/L	MCL	EPA 524.3	—	40 CFR 141.64
Haloacetic acids (HAA5) Sum of 5 HAAs; locational running annual average	0.060 mg/L	MCL	EPA 552.3	—	40 CFR 141.64
Bromate As bromate ion	0.010 mg/L	MCL	EPA 300.1	—	40 CFR 141.64
Chlorite	1.0 mg/L	MCL	EPA 300.1	—	40 CFR 141.64
Chlorine Maximum residual disinfectant level	4.0 mg/L as Cl2	MRDL	SM 4500-Cl	—	40 CFR 141.65
Chloramines As Cl2; maximum residual disinfectant level	4.0 mg/L as Cl2	MRDL	SM 4500-Cl	—	40 CFR 141.65
Chlorine dioxide Maximum residual disinfectant level	0.8 mg/L	MRDL	EPA 327.0	—	40 CFR 141.65

7 parameters · detection limits are laboratory PQLs — confirm the current approved method list with your certified lab.

Related tools: Compliance Monitoring Planner →

Inorganic Chemicals (IOC)

40 CFR 141.62

Includes nitrate/nitrite (acute health effects — 10 mg/L as N) and fluoride. Most IOCs monitor at entry points; systems with consistently low results may qualify for reduced monitoring or waivers from the state.

Parameter	Limit	Type	Method	Detection limit	Cite
Antimony	0.006 mg/L	MCL	EPA 200.8	PQL 0.006	40 CFR 141.62
Arsenic	0.010 mg/L	MCL	EPA 200.8	PQL 0.003	40 CFR 141.62
Asbestos Million fibers per liter; fibers >10 µm	7 MFL	MCL	EPA 100.2	PQL 0.2 MFL	40 CFR 141.62
Barium	2 mg/L	MCL	EPA 200.8	PQL 0.15	40 CFR 141.62
Beryllium	0.004 mg/L	MCL	EPA 200.8	PQL 0.001	40 CFR 141.62
Cadmium	0.005 mg/L	MCL	EPA 200.8	PQL 0.001	40 CFR 141.62
Chromium (total)	0.1 mg/L	MCL	EPA 200.8	PQL 0.01	40 CFR 141.62
Cyanide (as free cyanide) As free cyanide	0.2 mg/L	MCL	EPA 335.4	PQL 0.02	40 CFR 141.62
Fluoride Secondary standard 2.0 mg/L (40 CFR 143.3)	4.0 mg/L	MCL	EPA 300.0	PQL 0.1	40 CFR 141.62
Mercury (inorganic)	0.002 mg/L	MCL	EPA 245.1	PQL 0.0002	40 CFR 141.62
Nitrate (as N) As nitrogen	10 mg/L as N	MCL	EPA 300.0	PQL 0.4	40 CFR 141.62
Nitrite (as N) As nitrogen	1 mg/L as N	MCL	EPA 353.2	—	40 CFR 141.62
Nitrate + nitrite (as N) Sum, as nitrogen	10 mg/L as N	MCL	EPA 300.0	—	40 CFR 141.62
Selenium	0.05 mg/L	MCL	EPA 200.8	PQL 0.002	40 CFR 141.62
Thallium	0.002 mg/L	MCL	EPA 200.8	PQL 0.001	40 CFR 141.62

15 parameters · detection limits are laboratory PQLs — confirm the current approved method list with your certified lab.

Volatile Organic Chemicals (VOC)

40 CFR 141.61(a)

21 volatile organics — primarily solvents and fuel components. Entry-point monitoring; vulnerable systems monitor more often.

Parameter	Limit	Type	Method	Detection limit	Cite
Benzene	0.005 mg/L	MCL	EPA 524.3	DL 0.0005	40 CFR 141.61(a)
Carbon tetrachloride	0.005 mg/L	MCL	EPA 524.3	DL 0.0005	40 CFR 141.61(a)
Chlorobenzene Monochlorobenzene	0.1 mg/L	MCL	EPA 524.3	DL 0.0005	40 CFR 141.61(a)
o-Dichlorobenzene	0.6 mg/L	MCL	EPA 524.3	DL 0.0005	40 CFR 141.61(a)
p-Dichlorobenzene	0.075 mg/L	MCL	EPA 524.3	DL 0.0005	40 CFR 141.61(a)
1,2-Dichloroethane	0.005 mg/L	MCL	EPA 524.3	DL 0.0005	40 CFR 141.61(a)
1,1-Dichloroethylene	0.007 mg/L	MCL	EPA 524.3	DL 0.0005	40 CFR 141.61(a)
cis-1,2-Dichloroethylene	0.07 mg/L	MCL	EPA 524.3	DL 0.0005	40 CFR 141.61(a)
trans-1,2-Dichloroethylene	0.1 mg/L	MCL	EPA 524.3	DL 0.0005	40 CFR 141.61(a)
Dichloromethane Methylene chloride	0.005 mg/L	MCL	EPA 524.3	DL 0.0005	40 CFR 141.61(a)
1,2-Dichloropropane	0.005 mg/L	MCL	EPA 524.3	DL 0.0005	40 CFR 141.61(a)
Ethylbenzene	0.7 mg/L	MCL	EPA 524.3	DL 0.0005	40 CFR 141.61(a)
Styrene	0.1 mg/L	MCL	EPA 524.3	DL 0.0005	40 CFR 141.61(a)
Tetrachloroethylene PCE	0.005 mg/L	MCL	EPA 524.3	DL 0.0005	40 CFR 141.61(a)
Toluene	1 mg/L	MCL	EPA 524.3	DL 0.0005	40 CFR 141.61(a)
1,2,4-Trichlorobenzene	0.07 mg/L	MCL	EPA 524.3	DL 0.0005	40 CFR 141.61(a)
1,1,1-Trichloroethane	0.2 mg/L	MCL	EPA 524.3	DL 0.0005	40 CFR 141.61(a)
1,1,2-Trichloroethane	0.005 mg/L	MCL	EPA 524.3	DL 0.0005	40 CFR 141.61(a)
Trichloroethylene TCE	0.005 mg/L	MCL	EPA 524.3	DL 0.0005	40 CFR 141.61(a)
Vinyl chloride	0.002 mg/L	MCL	EPA 524.3	DL 0.0005	40 CFR 141.61(a)
Xylenes (total)	10 mg/L	MCL	EPA 524.3	DL 0.0005	40 CFR 141.61(a)

21 parameters · detection limits are laboratory PQLs — confirm the current approved method list with your certified lab.

Synthetic Organic Chemicals (SOC)

40 CFR 141.61(c)

30 pesticides and industrial chemicals with MCLs, plus acrylamide and epichlorohydrin controlled by treatment technique (polymer dosing limits). Use waivers are common where a state confirms no local source.

Parameter	Limit	Type	Method	Detection limit	Cite
Acrylamide Treatment technique	0.05% dosed at 1 ppm	TT	—	—	40 CFR 141.61(c)
Alachlor	0.002 mg/L	MCL	EPA 525.2	DL 0.0002	40 CFR 141.61(c)
Atrazine	0.003 mg/L	MCL	EPA 525.2	DL 0.0001	40 CFR 141.61(c)
Benzo(a)pyrene	0.0002 mg/L	MCL	EPA 525.2	DL 0.00002	40 CFR 141.61(c)
Carbofuran	0.04 mg/L	MCL	EPA 531.1	DL 0.0009	40 CFR 141.61(c)
Chlordane	0.002 mg/L	MCL	EPA 508	DL 0.0002	40 CFR 141.61(c)
Dalapon	0.2 mg/L	MCL	EPA 515.4	DL 0.001	40 CFR 141.61(c)
2,4-D	0.07 mg/L	MCL	EPA 515.4	DL 0.0001	40 CFR 141.61(c)
Dibromochloropropane (DBCP) 1,2-dibromo-3-chloropropane	0.0002 mg/L	MCL	EPA 504.1	DL 0.00002	40 CFR 141.61(c)
Di(2-ethylhexyl) adipate	0.4 mg/L	MCL	EPA 525.2	DL 0.0006	40 CFR 141.61(c)
Di(2-ethylhexyl) phthalate	0.006 mg/L	MCL	EPA 525.2	DL 0.0006	40 CFR 141.61(c)
Dinoseb	0.007 mg/L	MCL	EPA 515.4	DL 0.0002	40 CFR 141.61(c)
Diquat	0.02 mg/L	MCL	EPA 549.2	DL 0.0004	40 CFR 141.61(c)
Endothall	0.1 mg/L	MCL	EPA 548.1	DL 0.009	40 CFR 141.61(c)
Endrin	0.002 mg/L	MCL	EPA 508	DL 0.00001	40 CFR 141.61(c)
Epichlorohydrin Treatment technique	0.01% dosed at 20 ppm	TT	—	—	40 CFR 141.61(c)
Ethylene dibromide (EDB)	0.00005 mg/L	MCL	EPA 504.1	DL 0.00001	40 CFR 141.61(c)
Glyphosate	0.7 mg/L	MCL	EPA 547	DL 0.006	40 CFR 141.61(c)
Heptachlor	0.0004 mg/L	MCL	EPA 508	DL 0.00004	40 CFR 141.61(c)
Heptachlor epoxide	0.0002 mg/L	MCL	EPA 508	DL 0.00002	40 CFR 141.61(c)
Hexachlorobenzene	0.001 mg/L	MCL	EPA 525.2	DL 0.0001	40 CFR 141.61(c)
Hexachlorocyclopentadiene	0.05 mg/L	MCL	EPA 525.2	DL 0.0001	40 CFR 141.61(c)
Lindane gamma-HCH	0.0002 mg/L	MCL	EPA 508	DL 0.00002	40 CFR 141.61(c)
Methoxychlor	0.04 mg/L	MCL	EPA 508	DL 0.0001	40 CFR 141.61(c)
Oxamyl (Vydate)	0.2 mg/L	MCL	EPA 531.1	DL 0.002	40 CFR 141.61(c)
Polychlorinated biphenyls (PCBs) As decachlorobiphenyl	0.0005 mg/L	MCL	EPA 508	DL 0.0001	40 CFR 141.61(c)
Pentachlorophenol	0.001 mg/L	MCL	EPA 515.4	DL 0.00004	40 CFR 141.61(c)
Picloram	0.5 mg/L	MCL	EPA 515.4	DL 0.0001	40 CFR 141.61(c)
Simazine	0.004 mg/L	MCL	EPA 525.2	DL 0.00007	40 CFR 141.61(c)
2,3,7,8-TCDD (dioxin)	0.00000003 mg/L	MCL	EPA 1613	DL 0.000000005	40 CFR 141.61(c)
Toxaphene	0.003 mg/L	MCL	EPA 508	DL 0.001	40 CFR 141.61(c)
2,4,5-TP (Silvex)	0.05 mg/L	MCL	EPA 515.4	DL 0.0002	40 CFR 141.61(c)

32 parameters · detection limits are laboratory PQLs — confirm the current approved method list with your certified lab.

PFAS (2024 NPDWR)

40 CFR Part 141 (2024 PFAS NPDWR, 89 FR 32532)

Watch: The 2024 MCLs below are in force. EPA's May 2026 proposals — rescinding the PFHxS/PFNA/HFPO-DA/Hazard-Index standards and extending PFOA/PFOS compliance to 2031 — are still proposed, not final (verified 2026-10-01).

Six regulated PFAS: individual MCLs for PFOA, PFOS, PFHxS, PFNA, and HFPO-DA (GenX), plus a Hazard Index of 1 (unitless) for mixtures of PFHxS, PFNA, HFPO-DA, and PFBS. Initial monitoring was required by 2027 with compliance from 2029.

Parameter	Limit	Type	Method	Detection limit	Cite
PFOA 2024 MCL in force · 2026 change proposed MCLG 0. May 2026 EPA proposal: extend PFOA/PFOS compliance to 4/26/2031 (proposed, not final).	4.0 ppt	MCL	EPA 533 / 1633	—	40 CFR 141 Subpart Z
PFOS 2024 MCL in force · 2026 change proposed MCLG 0. May 2026 EPA proposal: extend PFOA/PFOS compliance to 4/26/2031 (proposed, not final).	4.0 ppt	MCL	EPA 533 / 1633	—	40 CFR 141 Subpart Z
PFHxS 2024 MCL in force · 2026 change proposed MCLG 10 ppt. May 2026 EPA proposal: rescind this standard (proposed, not final).	10 ppt	MCL	EPA 533 / 1633	—	40 CFR 141 Subpart Z
PFNA 2024 MCL in force · 2026 change proposed MCLG 10 ppt. May 2026 EPA proposal: rescind this standard (proposed, not final).	10 ppt	MCL	EPA 533 / 1633	—	40 CFR 141 Subpart Z
HFPO-DA (GenX chemicals) 2024 MCL in force · 2026 change proposed MCLG 10 ppt. May 2026 EPA proposal: rescind this standard (proposed, not final).	10 ppt	MCL	EPA 533 / 1633	—	40 CFR 141 Subpart Z
PFBS 2024 MCL in force · 2026 change proposed No individual MCL; regulated via the Hazard Index.	—	MCL	EPA 533 / 1633	—	40 CFR 141 Subpart Z
PFAS Hazard Index 2024 MCL in force · 2026 change proposed HI over PFHxS, PFNA, HFPO-DA, PFBS: Σ(measured ÷ HBWC); HBWCs 10/10/10/2000 ppt. May 2026 proposal: rescind (proposed, not final).	1 unitless	MCL	EPA 533 / 1633	—	40 CFR 141 Subpart Z

7 parameters · detection limits are laboratory PQLs — confirm the current approved method list with your certified lab.

Radionuclides

40 CFR 141.66

Gross alpha, combined radium-226/228, beta/photon emitters, and uranium. Entry-point monitoring on multi-year cycles; reduced schedules are common for stable ground-water systems.

Parameter	Limit	Type	Method	Detection limit	Cite
Gross alpha particle activity Excludes radon and uranium; includes Ra-226	15 pCi/L	MCL	EPA 900.0	—	40 CFR 141.66
Combined radium-226 + radium-228	5 pCi/L	MCL	EPA 903.0 / 904.0	—	40 CFR 141.66
Beta particle and photon radioactivity Annual dose equivalent	4 mrem/yr	MCL	—	—	40 CFR 141.66
Uranium	30 µg/L	MCL	EPA 200.8	—	40 CFR 141.66

4 parameters · detection limits are laboratory PQLs — confirm the current approved method list with your certified lab.

Related tools: Compliance Monitoring Planner →

Ground Water Rule (GWR)

40 CFR 141 Subpart S (§§141.400–141.405)

Applies to ground-water systems (and consecutive systems on ground water). Requires triggered source-water monitoring after a total-coliform-positive distribution sample, assessment monitoring in some cases, and corrective action for significant deficiencies or fecal contamination. Systems with 4-log virus treatment get reduced monitoring.

Triggered source-water monitoring after TC-positive routine samples
Corrective action for fecal indicators or significant deficiencies
Compliance monitoring for 4-log virus treatment

Related tools: Compliance Monitoring Planner →

Surface Water Treatment Rules (SWTR / LT1 / LT2)

40 CFR 141 Subparts H, P, T, W (§§141.70–141.76; §§141.500–141.553; §§141.700–141.723)

Filtration and disinfection requirements for surface water and GWUDI: turbidity performance standards, Giardia/virus/Cryptosporidium removal or inactivation credits, watershed control, and disinfection profiling. LT2 adds source-water Cryptosporidium monitoring with bin classification driving extra treatment.

Filtered-system turbidity: ≤0.3 NTU in 95% of samples, max 1 NTU
Disinfection CT / contact-time requirements
LT2 Cryptosporidium bin classification and toolbox treatment options

Secondary & supporting rules

Procedural rules that surround the MCL programs — every system needs them, but they set no chemical limits themselves:

Rule	Citation	What it requires
Public Notification Rule	40 CFR 141 Subpart Q (§§141.201–141.211)	Tier 1/2/3 public notices for violations — 24 hours, 30 days, or 1 year depending on severity.
Consumer Confidence Reports	40 CFR 141 Subpart O (§§141.151–141.155)	Annual water-quality reports delivered to customers by July 1.
Variances & Exemptions	40 CFR 141 Subpart K (§§141.40–141.46)	State-granted relief from MCLs or treatment techniques under strict conditions.

What OEBGD is. The Overseas Environmental Baseline Guidance Document (DoDM 4715.05, Volume 3: Water, effective June 29, 2020) sets baseline drinking-water standards for enduring DoD installations outside the United States where no Final Governing Standards (FGS) exist. Where an installation has an FGS, the FGS governs — and it may be stricter. Note: this 2020 document predates the 2024 federal PFAS rule and the Lead and Copper Rule Improvements; PFAS at DoD installations is covered by separate DoD policy memos.

DoD · DoDM 4715.05-V3EFFECTIVE 2020-06-29CONFIRMED CURRENT 2026-10-04REVIEWED MONTHLY

Have your own standard (FGS, host-nation rule, client limits)? Compare it against this table →

Lead and Copper (OEBGD §4.7)

OEBGD §4.7

Watch: OEBGD keeps the pre-LCRI action levels — 0.015 mg/L lead, 1.3 mg/L copper at the 90th percentile. The federal LCRI's 0.010 mg/L lead level (effective Nov 1, 2027) is not in this 2020 document.

DoD community and non-transient non-community systems must not exceed the action levels in more than 10 percent of tap samples in any monitoring period. Exceedance triggers water-quality-parameter monitoring, corrosion control, source-water work, public education, and lead service line replacement.

Parameter	Limit	Type	Method	Detection limit	Cite
Lead 90th percentile. LCRI lowers federal AL to 0.010 mg/L effective 11/1/2027.	0.015 mg/L	AL	EPA 200.8	PQL 0.005	OEBGD §4.7
Copper 90th percentile. LCRI retains 1.3 mg/L.	1.3 mg/L	AL	EPA 200.8	—	OEBGD §4.7

2 parameters · detection limits are laboratory PQLs — confirm the current approved method list with your certified lab.

Coliform Bacteria (OEBGD §4.4)

OEBGD §4.4

OEBGD's coliform framework mirrors the federal approach: routine distribution-system sampling, repeat samples, and triggered source-water monitoring, with assessments and corrective action on positives.

Parameter	Limit	Type	Method	Detection limit	Cite
E. coli Treatment-technique rule: MCL violation on E. coli-positive repeat or TC-positive routine combinations.	0 — RTCR trigger combinations	MCL	EPA 1603 / Colilert	—	OEBGD §4.4
Total coliform — system assessments Treatment-technique rule: assessments and corrective action on coliform triggers.	Level 1/2 assessments	TT	SM 9223	—	OEBGD §4.4
Ground Water Rule — source monitoring Treatment-technique rule: triggered and additional source-water monitoring.	§4.12 (structural)	TT	—	—	OEBGD §4.12
Surface-water filtration and disinfection Treatment-technique rule: minimum inactivation requirements.	3-log Giardia, 4-log virus	TT	—	—	OEBGD §4.11
Turbidity (filtered systems) Treatment-technique rule.	Consistent	TT	EPA 180.1	—	OEBGD §4.11

5 parameters · detection limits are laboratory PQLs — confirm the current approved method list with your certified lab.

Disinfectants / Disinfection Byproducts (OEBGD §4.9)

OEBGD §4.9

TTHM 0.080, HAA5 0.060, chlorite 1.0, bromate 0.010 mg/L; chlorine and chloramine MRDLs of 4.0 mg/L. Noncompliance for TTHM/HAA5 is judged on the locational running annual average — same structure as the federal Stage 2 rule.

Parameter	Limit	Type	Method	Detection limit	Cite
Total trihalomethanes (TTHM) Sum of 4 THMs; locational running annual average	0.080 mg/L	MCL	EPA 524.3	—	OEBGD §4.9
Haloacetic acids (HAA5) Sum of 5 HAAs; locational running annual average	0.060 mg/L	MCL	EPA 552.3	—	OEBGD §4.9
Bromate As bromate ion	0.010 mg/L	MCL	EPA 300.1	—	OEBGD §4.9
Chlorite	1.0 mg/L	MCL	EPA 300.1	—	OEBGD §4.9
Chlorine Maximum residual disinfectant level	4.0 mg/L as Cl2	MRDL	SM 4500-Cl	—	OEBGD §4.9
Chloramines As Cl2; maximum residual disinfectant level	4.0 mg/L as Cl2	MRDL	SM 4500-Cl	—	OEBGD §4.9
Chlorine dioxide Maximum residual disinfectant level	0.8 mg/L	MRDL	EPA 327.0	—	OEBGD §4.9

7 parameters · detection limits are laboratory PQLs — confirm the current approved method list with your certified lab.

Inorganic Chemicals (OEBGD §4.5, Table 2)

OEBGD §4.5, Table 2

MCLs for community and non-transient non-community systems. Sodium and nickel carry no MCL — monitoring only, reported to the DoD medical authority. Fluoride MCL 4.0 mg/L; secondary 2.0 mg/L for notification.

Parameter	Limit	Type	Method	Detection limit	Cite
Antimony	0.006 mg/L	MCL	EPA 200.8	PQL 0.006	OEBGD §4.5 Table 2
Arsenic	0.010 mg/L	MCL	EPA 200.8	PQL 0.003	OEBGD §4.5 Table 2
Asbestos Million fibers per liter; fibers >10 µm	7 MFL	MCL	EPA 100.2	PQL 0.2 MFL	OEBGD §4.5 Table 2
Barium	2.0 mg/L	MCL	EPA 200.8	PQL 0.15	OEBGD §4.5 Table 2
Beryllium	0.004 mg/L	MCL	EPA 200.8	PQL 0.001	OEBGD §4.5 Table 2
Cadmium	0.005 mg/L	MCL	EPA 200.8	PQL 0.001	OEBGD §4.5 Table 2
Chromium (total)	0.1 mg/L	MCL	EPA 200.8	PQL 0.01	OEBGD §4.5 Table 2
Cyanide (as free cyanide) As free cyanide	0.2 mg/L	MCL	EPA 335.4	PQL 0.02	OEBGD §4.5 Table 2
Fluoride Secondary standard 2.0 mg/L (40 CFR 143.3)	4.0 mg/L	MCL	EPA 300.0	PQL 0.1	OEBGD §4.6
Mercury (inorganic)	0.002 mg/L	MCL	EPA 245.1	PQL 0.0002	OEBGD §4.5 Table 2
Nitrate (as N) As nitrogen	10 mg/L as N	MCL	EPA 300.0	PQL 0.4	OEBGD §4.5 Table 2
Nitrite (as N) As nitrogen	1 mg/L as N	MCL	EPA 353.2	—	OEBGD §4.5 Table 2
Nitrate + nitrite (as N) Sum, as nitrogen	10 mg/L as N	MCL	EPA 300.0	—	OEBGD §4.5 Table 2
Selenium	0.05 mg/L	MCL	EPA 200.8	PQL 0.002	OEBGD §4.5 Table 2
Thallium	0.002 mg/L	MCL	EPA 200.8	PQL 0.001	OEBGD §4.5 Table 2

15 parameters · detection limits are laboratory PQLs — confirm the current approved method list with your certified lab.

Volatile Organic Chemicals (OEBGD §4.8, Table 5)

OEBGD §4.8, Table 5

Volatile organics with OEBGD detection limits alongside each MCL. Systems monitoring quarterly or more are out of compliance when the annual running average at a sample point exceeds the MCL.

Parameter	Limit	Type	Method	Detection limit	Cite
Benzene	0.005 mg/L	MCL	EPA 524.3	DL 0.0005	OEBGD §4.8
Carbon tetrachloride	0.005 mg/L	MCL	EPA 524.3	DL 0.0005	OEBGD §4.8
Chlorobenzene Monochlorobenzene	0.1 mg/L	MCL	EPA 524.3	DL 0.0005	OEBGD §4.8
o-Dichlorobenzene	0.6 mg/L	MCL	EPA 524.3	DL 0.0005	OEBGD §4.8
p-Dichlorobenzene	0.075 mg/L	MCL	EPA 524.3	DL 0.0005	OEBGD §4.8
1,2-Dichloroethane	0.005 mg/L	MCL	EPA 524.3	DL 0.0005	OEBGD §4.8
1,1-Dichloroethylene	0.007 mg/L	MCL	EPA 524.3	DL 0.0005	OEBGD §4.8
cis-1,2-Dichloroethylene	0.07 mg/L	MCL	EPA 524.3	DL 0.0005	OEBGD §4.8
trans-1,2-Dichloroethylene	0.1 mg/L	MCL	EPA 524.3	DL 0.0005	OEBGD §4.8
Dichloromethane Methylene chloride	0.005 mg/L	MCL	EPA 524.3	DL 0.0005	OEBGD §4.8
1,2-Dichloropropane	0.005 mg/L	MCL	EPA 524.3	DL 0.0005	OEBGD §4.8
Ethylbenzene	0.7 mg/L	MCL	EPA 524.3	DL 0.0005	OEBGD §4.8
Styrene	0.1 mg/L	MCL	EPA 524.3	DL 0.0005	OEBGD §4.8
Tetrachloroethylene PCE	0.005 mg/L	MCL	EPA 524.3	DL 0.0005	OEBGD §4.8
Toluene	1.0 mg/L	MCL	EPA 524.3	DL 0.0005	OEBGD §4.8
1,2,4-Trichlorobenzene	0.07 mg/L	MCL	EPA 524.3	DL 0.0005	OEBGD §4.8
1,1,1-Trichloroethane	0.20 mg/L	MCL	EPA 524.3	DL 0.0005	OEBGD §4.8
1,1,2-Trichloroethane	0.005 mg/L	MCL	EPA 524.3	DL 0.0005	OEBGD §4.8
Trichloroethylene TCE	0.005 mg/L	MCL	EPA 524.3	DL 0.0005	OEBGD §4.8
Vinyl chloride	0.002 mg/L	MCL	EPA 524.3	DL 0.0005	OEBGD §4.8
Xylenes (total)	10 mg/L	MCL	EPA 524.3	DL 0.0005	OEBGD §4.8

21 parameters · detection limits are laboratory PQLs — confirm the current approved method list with your certified lab.

Synthetic Organic Chemicals (OEBGD §4.8, Table 5)

OEBGD §4.8, Table 5

Pesticides and industrial chemicals; acrylamide and epichlorohydrin are controlled by treatment technique (polymer dosing limits) rather than MCLs — same as the federal rule.

Parameter	Limit	Type	Method	Detection limit	Cite
Acrylamide Treatment technique	0.05% dosed at 1 ppm	TT	—	—	OEBGD §4.8
Alachlor	0.002 mg/L	MCL	EPA 525.2	DL 0.0002	OEBGD §4.8
Atrazine	0.003 mg/L	MCL	EPA 525.2	DL 0.0001	OEBGD §4.8
Benzo(a)pyrene	0.0002 mg/L	MCL	EPA 525.2	DL 0.00002	OEBGD §4.8
Carbofuran	0.04 mg/L	MCL	EPA 531.1	DL 0.0009	OEBGD §4.8
Chlordane	0.002 mg/L	MCL	EPA 508	DL 0.0002	OEBGD §4.8
Dalapon	0.2 mg/L	MCL	EPA 515.4	DL 0.001	OEBGD §4.8
2,4-D	0.07 mg/L	MCL	EPA 515.4	DL 0.0001	OEBGD §4.8
Dibromochloropropane (DBCP) 1,2-dibromo-3-chloropropane	0.0002 mg/L	MCL	EPA 504.1	DL 0.00002	OEBGD §4.8
Di(2-ethylhexyl) adipate	0.4 mg/L	MCL	EPA 525.2	DL 0.0006	OEBGD §4.8
Di(2-ethylhexyl) phthalate	0.006 mg/L	MCL	EPA 525.2	DL 0.0006	OEBGD §4.8
Dinoseb	0.007 mg/L	MCL	EPA 515.4	DL 0.0002	OEBGD §4.8
Diquat	0.02 mg/L	MCL	EPA 549.2	DL 0.0004	OEBGD §4.8
Endothall	0.1 mg/L	MCL	EPA 548.1	DL 0.009	OEBGD §4.8
Endrin	0.002 mg/L	MCL	EPA 508	DL 0.00001	OEBGD §4.8
Epichlorohydrin Treatment technique	0.01% dosed at 20 ppm	TT	—	—	OEBGD §4.8
Ethylene dibromide (EDB)	0.00005 mg/L	MCL	EPA 504.1	DL 0.00001	OEBGD §4.8
Glyphosate	0.7 mg/L	MCL	EPA 547	DL 0.006	OEBGD §4.8
Heptachlor	0.0004 mg/L	MCL	EPA 508	DL 0.00004	OEBGD §4.8
Heptachlor epoxide	0.0002 mg/L	MCL	EPA 508	DL 0.00002	OEBGD §4.8
Hexachlorobenzene	0.001 mg/L	MCL	EPA 525.2	DL 0.0001	OEBGD §4.8
Hexachlorocyclopentadiene	0.05 mg/L	MCL	EPA 525.2	DL 0.0001	OEBGD §4.8
Lindane gamma-HCH	0.0002 mg/L	MCL	EPA 508	DL 0.00002	OEBGD §4.8
Methoxychlor	0.04 mg/L	MCL	EPA 508	DL 0.0001	OEBGD §4.8
Oxamyl (Vydate)	0.2 mg/L	MCL	EPA 531.1	DL 0.002	OEBGD §4.8
Polychlorinated biphenyls (PCBs) As decachlorobiphenyl	0.0005 mg/L	MCL	EPA 508	DL 0.0001	OEBGD §4.8
Pentachlorophenol	0.001 mg/L	MCL	EPA 515.4	DL 0.00004	OEBGD §4.8
Picloram	0.5 mg/L	MCL	EPA 515.4	DL 0.0001	OEBGD §4.8
Simazine	0.004 mg/L	MCL	EPA 525.2	DL 0.00007	OEBGD §4.8
2,3,7,8-TCDD (dioxin)	0.00000003 mg/L	MCL	EPA 1613	DL 0.000000005	OEBGD §4.8
Toxaphene	0.003 mg/L	MCL	EPA 508	DL 0.001	OEBGD §4.8
2,4,5-TP (Silvex)	0.05 mg/L	MCL	EPA 515.4	DL 0.0002	OEBGD §4.8

32 parameters · detection limits are laboratory PQLs — confirm the current approved method list with your certified lab.

PFAS — not in OEBGD

Not established

Watch: The 2020 OEBGD predates the 2024 federal PFAS rule, so it sets no PFAS MCLs. PFAS at DoD installations is governed by separate DoD policy: the 2023 monitoring policy, the December 2024 domestic policy, and the September 2025 OCONUS policy (monitoring by April 26, 2027).

Rows below show the federal values for reference only — they are not OEBGD requirements.

Parameter	Limit	Type	Method	Detection limit	Cite
PFOA MCLG 0. May 2026 EPA proposal: extend PFOA/PFOS compliance to 4/26/2031 (proposed, not final).	—	—	—	—	Not in OEBGD Vol 3 (2020)
PFOS MCLG 0. May 2026 EPA proposal: extend PFOA/PFOS compliance to 4/26/2031 (proposed, not final).	—	—	—	—	Not in OEBGD Vol 3 (2020)
PFHxS MCLG 10 ppt. May 2026 EPA proposal: rescind this standard (proposed, not final).	—	—	—	—	Not in OEBGD Vol 3 (2020)
PFNA MCLG 10 ppt. May 2026 EPA proposal: rescind this standard (proposed, not final).	—	—	—	—	Not in OEBGD Vol 3 (2020)
HFPO-DA (GenX chemicals) MCLG 10 ppt. May 2026 EPA proposal: rescind this standard (proposed, not final).	—	—	—	—	Not in OEBGD Vol 3 (2020)
PFBS No individual MCL; regulated via the Hazard Index.	—	—	—	—	Not in OEBGD Vol 3 (2020)
PFAS Hazard Index HI over PFHxS, PFNA, HFPO-DA, PFBS: Σ(measured ÷ HBWC); HBWCs 10/10/10/2000 ppt. May 2026 proposal: rescind (proposed, not final).	—	—	—	—	Not in OEBGD Vol 3 (2020)

7 parameters · detection limits are laboratory PQLs — confirm the current approved method list with your certified lab.

Radionuclides (OEBGD §4.10, Table 8)

OEBGD §4.10, Table 8

Gross alpha 15 pCi/L, combined radium-226/228 5 pCi/L, beta/photon 4 mrem/yr, uranium 30 µg/L. Routine monitoring every 4 years (9 years for beta/photon) at each entry point to the distribution system.

Parameter	Limit	Type	Method	Detection limit	Cite
Gross alpha particle activity Excludes radon and uranium; includes Ra-226	15 pCi/L	MCL	EPA 900.0	—	OEBGD §4.10.a Table 8
Combined radium-226 + radium-228	5 pCi/L	MCL	EPA 903.0 / 904.0	—	OEBGD §4.10.a Table 8
Beta particle and photon radioactivity Annual dose equivalent	4 mrem/yr	MCL	—	—	OEBGD §4.10.a Table 8
Uranium	30 µg/L	MCL	EPA 200.8	—	OEBGD §4.10.a Table 8

4 parameters · detection limits are laboratory PQLs — confirm the current approved method list with your certified lab.

Groundwater Treatment (OEBGD §4.12)

OEBGD §4.12

DoD groundwater systems: disinfection, triggered monitoring, and corrective-action requirements structured around the same 4-log virus treatment concept as the federal Ground Water Rule.

Disinfection to 4-log virus inactivation where required
Triggered source-water monitoring on coliform positives
Corrective action for fecal contamination or deficiencies

Surface Water Treatment (OEBGD §4.11)

OEBGD §4.11

Filtration plus disinfection for 3-log Giardia, 4-log virus, and 2-log Cryptosporidium; filtered-water turbidity ≤0.3 NTU in 95% of samples (max 1 NTU); CT tables in Appendix 4A.

Filtered turbidity: ≤0.3 NTU in 95% of samples, max 1 NTU
Disinfection CT tables (Appendix 4A)
Watershed control and covered finished-water storage

Supporting requirements

Requirement	Citation	What it requires
Consumer Confidence Reports	OEBGD §4.15	Annual water-quality reports for the installation community.
Notification Requirements	OEBGD §4.16	Violation and exceedance notifications — including 14-day and 72-hour timelines for acute risks such as nitrate MCL exceedances.

Why a separate PFAS tab? OEBGD Volume 3 (2020) predates the federal PFAS rule, so it sets no PFAS limits. For DoD installations — including Navy installations — PFAS in drinking water is governed by a separate track of DoD policy memos, summarized here. The Navy implements these DoD-wide policies at its installations.

DoD · PFAS DRINKING-WATER POLICYLATEST CHECK 2026-10-05REVIEWED MONTHLY

Federal PFAS limits as applied by DoD

2024 PFAS NPDWR (89 FR 32532), applied to DoD systems via the Dec 4, 2024 DoD policy

The December 2024 DoD policy applies the 2024 federal PFAS MCLs to DoD-owned drinking water systems in the United States — including potable systems not regulated under the NPDWR (as policy, not as a regulatory requirement). Where fully promulgated state or local PFAS rules are more protective, those apply instead.

PFAS	MCL	Type	Cite
PFOA (perfluorooctanoic acid)	4.0 ppt	MCL	2024 NPDWR via Dec 4, 2024 DoD policy
PFOS (perfluorooctane sulfonic acid)	4.0 ppt	MCL	2024 NPDWR via Dec 4, 2024 DoD policy
PFHxS	10 ppt	MCL	2024 NPDWR via Dec 4, 2024 DoD policy
PFNA	10 ppt	MCL	2024 NPDWR via Dec 4, 2024 DoD policy
HFPO-DA (GenX chemicals)	10 ppt	MCL	2024 NPDWR via Dec 4, 2024 DoD policy
Mixture of PFHxS + PFNA + HFPO-DA + PFBS	Hazard Index 1.0 (unitless)	MCL	2024 NPDWR via Dec 4, 2024 DoD policy

Watch: EPA’s May 2026 proposals — rescinding the PFHxS/PFNA/HFPO-DA/Hazard-Index standards and extending PFOA/PFOS compliance to 2031 — are still proposed, not final (verified 2026-10-01). DoD policy currently tracks the 2024 final rule.

Off-base private wells — July 1, 2026 guidance

ASD(EI&E), “Clarifying Guidance for Taking Interim Actions to Address Releases of PFOA and PFOS from DoW Installations Impacting Private Drinking Water”

Where PFOA/PFOS from installation activities impact off-base private drinking-water wells, the Department may take interim actions — including alternate water — while a permanent remedy is developed. Navy installations (e.g., NAS Whiting Field, Jacksonville-area installations) are actively sampling private wells under this framework.

Navy implementation — Mar 11, 2026 CNIC policy

Commander, Navy Installations Command, 5090 Ser N4/26U020, “Updates to Policy for PFAS Monitoring and Treatment in Navy-Owned Drinking Water Systems” — Navy-wide implementation of the Dec 2024 (domestic) and Sept 2025 (OCONUS) DoD policies.

Applies to all Navy-owned drinking water systems where the Navy is the purveyor, worldwide — including systems not regulated under the NPDWR. Excludes consecutive systems buying from a local purveyor and non-potable-only systems; all overseas Navy systems count as Navy-owned.
Initial monitoring complete by April 26, 2027: finished-water samples at all entry points to the distribution system (EPTDSs), by EPA Method 533 — the six NPDWR PFAS plus every other PFAS the method detects. Earlier UCMR 5 or state data may count if collected by Method 533/537.1 at valid EPTDSs. Frequency: surface water — quarterly over 12 months (2–4 months apart); groundwater serving more than 10,000 — quarterly; groundwater serving 10,000 or fewer — twice in 12 months (5–7 months apart); overseas systems with unknown host-nation source — quarterly.
Ongoing compliance monitoring from April 26, 2027 at all EPTDSs, with frequency set by initial results against trigger levels, MCLs, and the Hazard Index. Results below the practical quantitation level count as zero in running-annual-average math. Semi-annual starters go triennial from 2027 if every initial result was below trigger levels — or quarterly if any result exceeded a trigger level.
MCL compliance by April 26, 2029 — treatment (granular activated carbon, anion exchange, reverse osmosis, nanofiltration) or non-treatment options such as an alternate source.
Public communication: EPTDS results above trigger levels posted on the installation public webpage within 30 days (CNIC standard language); from April 26, 2027, Consumer Confidence Reports carry PFAS results and Hazard Index data at or above trigger levels; Tier 3 public notifications for monitoring/testing violations; from April 26, 2029, Tier 2 notifications and mandatory health-effects language for MCL violations.
Installations report to CNIC on bi-monthly and quarterly data calls (OSD templates, with lab reports), using standardized EPTDS names.

Systems outside the U.S. — Sept 28, 2025 policy

ASD(EI&E) memorandum, “Policy for Monitoring and Treatment of PFAS in DoD Drinking Water Systems outside the United States”

Overseas installations complete PFAS monitoring by April 26, 2027, mirroring the domestic timeline. Host-nation standards reported under the May 2020 and January 2020 PFAS data calls may impose additional requirements — check the installation FGS.

U.S. DoD-owned systems — Dec 4, 2024 policy

ASD(EI&E) memorandum, “Policy for PFAS Monitoring and Treatment in DoD-Owned Drinking Water Systems in the United States”

Initial monitoring complete by April 26, 2027 (community and non-transient non-community systems per NPDWR frequencies; non-NPDWR potable systems twice in 12 months).
Ongoing compliance monitoring from April 26, 2027; trigger levels set at half the MCLs (half the Hazard Index for mixtures).
MCL compliance by April 26, 2029, judged on the running annual average (RAA).
Sampling by EPA Method 533; systems monitor all analytes detected by Method 533, not just the six regulated PFAS.
Consumer Confidence Reports include detections at/above trigger levels; Tier 2 public notification (30 days) for MCL violations.
Cancels the July 11, 2023 DoD PFAS sampling memo.

Cleanup prioritization — Sept 3, 2024

ASD(EI&E), “Prioritization of DoD Cleanup Actions to Implement the Federal Drinking Water Standards for PFAS”

Under the Defense Environmental Restoration Program, PFAS removal actions are prioritized at three times the MCL, with long-term remedial actions targeting the MCLs as final cleanup levels (or site-specific levels set with regulators where background exceeds them).

Source: DoD PFAS Task Force — Policies (ASD(EI&E) / ASW(EI&E) memoranda). Navy implementation: installation PFAS pages via CNIC; SECNAV PFAS portal (secnav.navy.mil/eie).

PRO · CUSTOM COMPARISONFREE WHILE IN BETA

Build your binding-limits table: pick the baseline, add your own standard (an FGS, a state rule, client limits), and see the strictest value win for every parameter. Example: Romania FGS sets lead at 0.010 mg/L vs 0.015 in 40 CFR 141 — your binding limit becomes 0.010. Your comparison is saved in this browser and can be sent straight into the Monitoring Planner.

1 · Baseline — compare against

40 CFR Part 141 (US EPA)OEBGD (DoD overseas)

2 · Your standard (FGS, state rule, or client limit set)

Drop a CSV of limits here, or browse

Send it to the Monitoring Planner

Your comparison is saved in this browser. Open Step 3 and it will offer to apply it — then add the system background and historical data to get the schedule, gap check, and future suggestions.

Open Step 3 →

Pro will add: multiple saved standards, automatic alerts when a rule change moves your binding limits, and multi-system comparison. Join the waitlist →

PRIVATE · FGS LIBRARY9 COUNTRIES

Final Governing Standards (FGS) are the country-specific environmental rules for U.S. DoD installations overseas — the overseas counterpart to the OEBGD. This is a private library: whitelisted emails only, not part of the Pro trial.

About this library: FGS documents are U.S. Government works (public domain). These PDFs were collected from fully public sources or provided by the site owner, and none carries a distribution limitation. Access is restricted to whitelisted emails — no one else can unlock it, including Pro trial users.

More countries coming: Korea, UK — their FGS documents are not publicly posted. They will be added here when available through public sources.

Screen your data against these limits

Drop a lab datasheet into the Water Quality Data Analyzer (Step 2) — exceedances are flagged against the federal MCLs and action levels automatically.

Open Step 2 →

Turn limits into a schedule

The Compliance Monitoring Planner (Step 3) takes your system background and these same rules and produces a system-specific monitoring plan — routine, reduced, and increased schedules with CFR citations — and can compare federal, OEBGD, and your own custom limits side by side.

Open Step 3 →

Compare your own standard — Pro

Bring a state standard, a host-nation FGS, or a client-specific limit set: drop it in and see the strictest value win, parameter by parameter, against the federal and OEBGD tables above. Built for consultants juggling multiple jurisdictions.

Methodology

Two sources, same discipline. The 40 CFR Part 141 tab is the current federal requirement as verified against the eCFR and EPA’s NPDWR table. The OEBGD tab is DoDM 4715.05 Volume 3 (Water), effective June 29, 2020 — verified against the official DoD issuance; it is the latest version (no change transmittal issued for Volume 3). Proposed rules are labeled as proposed — never presented as in force. States with primacy, host-nation FGSs, and installation-specific standards may be stricter; always confirm with the governing authority. This page is a reference aid, not legal advice.

Kept current. Both tabs are re-checked against the eCFR, the Federal Register, and DoD issuances on the first of every month. Last verified 2026-10-04 — no changes since the prior check.