CCR template, mapped to the rule.
A Consumer Confidence Report template that maps section-for-section to 40 CFR § 141.153 (a)–(i), the nine content paragraphs that every annual drinking water quality report must cover. Use this as the structural outline when you draft in Word or Google Docs, or let the 1water.ai CCR Agent populate every section from your lab PDFs and SDWIS feed.
Nine sections, one federal rule.
Every section below is a real paragraph of 40 CFR § 141.153. Under each, we list what the rule requires (structural checklist) and the common mistake that triggers primacy-agency rejection. We do not reproduce Appendix A verbatim language here — that text must come from the authoritative eCFR snapshot, not a website copy. 1water.ai loads Appendix A at build time via the eCFR JSON API and reproduces it byte-exact in the generated CCR.
This template applies to every U.S. community water system regardless of size, source type, or primacy state. State overlays add requirements on top of this structure — they never remove a federal section.
Nine content areas, one per paragraph.
Water system information
Utility name, primary service area, PWSID, system contact with name and phone, a statement on participation rights in local decisions, and a source-water statement (origin, type, susceptibility).
Listing a generic 'customer service' number instead of a PWSID- and compliance-aware contact that a concerned consumer or state regulator can reach.
Definitions
Required definitions, verbatim from the rule: MCL, MCLG, treatment technique, action level, variances/exemptions, Level 1/2 assessments, plus any definitions for parameters actually detected in the reporting year.
Paraphrasing MCL/MCLG definitions. The rule text is verbatim — any edit is a compliance finding.
Detected contaminants table
Every regulated contaminant detected above the minimum reporting level during the reporting year, with: level found, range, unit, sampling date, MCL, MCLG, likely source, and violation status. Contaminants also flow into § 141.153(d)(4) Lead & Copper narratives when applicable.
Unit-normalization errors — mixing ppb and mg/L in the same table. Single biggest reason primacy agencies reject CCRs.
Lead and copper narrative
Lead action level, copper action level, 90th-percentile sample result for each, number of samples collected, number of samples exceeding the action level. If the lead action level is exceeded, the § 141.154 educational language is mandatory and verbatim.
Omitting the 90th-percentile sample count, or using the prior LCR lead action level (0.015 mg/L) instead of the current LCRI action level (0.010 mg/L, § 141.80(c)(1)) once the system enters LCRI compliance.
Compliance with National Primary Drinking Water Regulations
Summary of compliance with every applicable primary regulation (MCL, MRDL, treatment technique, monitoring requirement). Specific language when all monitoring is in compliance.
Silent on partial compliance. If there was a single late sample or missed monitoring, it belongs in § 141.153(g) violations — do not let it fall through the cracks here.
Variances and exemptions
If the system operates under any state-approved variance or exemption, the section must describe the variance, its duration, and what the system is doing to return to compliance.
Assuming 'no variance' needs no statement. Most CCRs should explicitly say none is in effect.
Required additional information on violations
Every MCL, MRDL, treatment technique, and monitoring violation that occurred during the reporting year. For each: length of the violation, potential health effects (verbatim from Appendix A), steps the system is taking to correct, and how consumers were notified under Subpart Q.
Rewriting health-effects language. Appendix A is byte-exact — any edit fails review.
Required additional information on monitoring
Monitoring results for contaminants with monitoring waivers, unregulated-contaminant data, Level 1/Level 2 coliform assessments, and information required for systems monitoring under § 141.40 (Unregulated Contaminant Monitoring Rule).
Dropping UCMR data because the contaminant is unregulated. The rule requires disclosure even when there is no MCL.
Required educational information
Educational language for immunocompromised consumers (Cryptosporidium, etc.), lead minimization language, and an explanation of how consumers can participate in decisions. Each block has mandatory verbatim text from Appendix A.
Using last year's template without refreshing from the current Appendix A snapshot. EPA updates Appendix A periodically; LLM paraphrases fail.
Appendix A is byte-exact.
40 CFR 141 Subpart O Appendix A supplies mandatory verbatim language for health effects (when a contaminant exceeds its MCL), educational blocks (immunocompromised consumers, lead minimization, Cryptosporidium risk), and specific Tier 1/2/3 public notification text under Subpart Q. These blocks must be reproduced exactly — with no paraphrasing, reformatting, or translation (a translated version must come from the EPA-published translation, not a generic machine translation).
1water.ai resolves every verbatim block via a build-time fetch from the eCFR JSON API into packages/reference/verbatim-blocks.ts. If EPA updates Appendix A, we re-fetch and publish the delta in our changelog. The LLM is never given latitude to author regulatory language.
State requirements layered on top.
Many state primacy agencies add to this template: additional regulated contaminants, state-specific educational language, different distribution requirements for systems serving non-bill-paying consumers, tribal or language-access provisions. See the state overlay matrix for our launch coverage.
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