Positive coliform sample? Here’s the response pathway.
Answer one question to see the general steps — repeat sampling, Level 1 vs Level 2 assessment, and whether a Tier 1 public notice is required under the Revised Total Coliform Rule.
Coliform response pathway
What did your sample result show? Pick one to see the general response pathway.
This tool is an educational guide, not compliance advice. Sample counts, assessment triggers, deadlines, and notice tiers vary by state and system type. Always confirm the exact requirements with your primacy agency and 40 CFR 141 (Subparts Y and Q) before you act.
Coliform response — common questions
- U.S. EPA — Revised Total Coliform Rule, 40 CFR § 141 Subpart Y (§ 141.854–.861).
- U.S. EPA — Public Notification Rule, 40 CFR § 141 Subpart Q (§ 141.201–.205).
Want a wizard that walks the whole RTCR response — and drafts the notice?
We’re building an operator tool that walks the full decision tree for your system and drafts the public notice with your state’s language. Tell us where to reach you.
A response wizard that drafts the notice for you — coming soon.
1water is building operator tools that walk the RTCR decision tree and draft the public notice with your state's language. Want early access?