Terms of Use & Disclaimer
Last updated: September 30, 2026
By using Practical Notes Lab, you agree to these terms. If you do not agree, please do not use the site.
Tools are reference aids, not engineering design
The calculators, converters, and reference pages on this site are provided as educational and reference aids. They are intended to support study, field checks, and preliminary work. They are not engineering design tools, and their outputs are not a substitute for professional engineering analysis, regulatory review, or qualified professional judgment.
Always verify results against current regulations, applicable codes and standards, manufacturer data, and site-specific conditions before making operational or design decisions.
Compliance data is a research aid
The Drinking Water Compliance Center compares regulatory values (such as 40 CFR Part 141 and DoD OEBGD) side by side as a research aid for consultants and operators. Every entry cites its source and shows a last-verified date, and proposed rules are marked as proposals — not as current requirements.
This content is not legal advice and does not replace the official regulatory text, state or host-nation requirements, or advice from a qualified attorney or engineer. Regulations change; confirm the current version in the official source (e.g., eCFR, Federal Register) before relying on any value for a compliance decision.
No liability
The site and its tools are provided “as is,” without warranties of any kind, express or implied, including accuracy, completeness, or fitness for a particular purpose. To the fullest extent permitted by law, the site operator is not liable for any loss, damage, or cost arising from the use of, or reliance on, the site’s content or tools — including decisions made about treatment operations, compliance, or design.
Content may change
Tool formulas, reference data, and page content may be updated, corrected, or removed at any time without notice. Where a correction affects published results, an update note will be added where practical.
Acceptable use
You agree not to misuse the site, attempt to disrupt its operation, or misrepresent its content as your own professional work product without verification. You may link to the site’s pages freely.
Contact
Questions about these terms: practicalnotes2026@gmail.com.