40 CFR 141 Subpart O, plus state overlays.
The federal CCR rule, cited section-by-section. State overlays for the 8 states we cover at launch, federal-baseline for the rest. Regulation text is sourced from the eCFR JSON API at build time — we never paraphrase it.
Six sections, one rule, one source of truth.
Each section below links to the authoritative eCFR page. Our agent loads the verbatim text from the eCFR JSON API at build time and stores a timestamped snapshot; it never paraphrases or rewrites these blocks. If EPA updates the rule, we re-fetch.
Purpose and applicability
Establishes the CCR requirement for community water systems and defines the categories of systems subject to the rule.
Read on eCFR →Effective dates
Reporting deadlines and the July 1 annual publish cutoff. Original effective date August 19, 1998; current effective dates reflect LCRI amendments.
Read on eCFR →Content of the reports
The nine required content areas — system information, source water, definitions, detected contaminants, Lead and Copper narrative, unregulated contaminants, variances, violations, educational statements.
Read on eCFR →Required additional content
Additional content triggered by specific detection events — arsenic, lead, nitrate, radon, etc. Each trigger requires verbatim language from Appendix A.
Read on eCFR →Report delivery and recordkeeping
Distribution methods by system size, the Certificate of Delivery requirement, and the 5-year recordkeeping obligation.
Read on eCFR →Regulated contaminants, MCL/MCLG, health effects, verbatim blocks
The authoritative list of regulated contaminants, their MCLs and MCLGs, health effects language, likely sources, and the verbatim educational text that must be reproduced byte-exact in every CCR.
Read on eCFR →8 state overlays at launch, 42 on the roadmap.
State overlays are the primacy-agency deltas on top of the federal baseline — extra regulated contaminants, state-specific public education, different distribution rules. At launch we ship authoritative overlays for CA, TX, NY, FL, IL, OH, PA, NC. Federal baseline runs in every state.
In-development overlays: California, Florida, Illinois, New York, North Carolina, Ohio, Pennsylvania, Texas.
Rule updates, change-log, and versioning.
When EPA publishes an update to 40 CFR 141 Subpart O, we re-fetch the full subpart from the eCFR JSON API, compare against the previous snapshot, and document the diff in our changelog. Customers who publish a CCR under an earlier version receive an advisory email with a link to the delta so they can update next year’s filing as required.
State overlays are managed the same way, scoped per state. A state rule update triggers a per-state re-fetch and a per-state customer notification.
This is why we don’t “train” the model on regulation text — a trained model drifts silently. A cached JSON snapshot is verifiable.
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