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Revisions to the Unregulated Contaminant Monitoring Regulation (UCMR 3) for Public Water Systems 

---
identifier: "/us/fr/C1-2012-9978"
source: "fr"
legal_status: "authoritative_unofficial"
title: "Revisions to the Unregulated Contaminant Monitoring Regulation (UCMR 3) for Public Water Systems"
title_number: 0
title_name: "Federal Register"
section_number: "C1-2012-9978"
section_name: "Revisions to the Unregulated Contaminant Monitoring Regulation (UCMR 3) for Public Water Systems"
positive_law: false
currency: "2012-07-02"
last_updated: "2012-07-02"
format_version: "1.1.0"
generator: "[email protected]"
agency: "Environmental Protection Agency"
document_number: "C1-2012-9978"
document_type: "rule"
publication_date: "2012-07-02"
agencies:
  - "Environmental Protection Agency"
cfr_references:
  - "40 CFR Part 141"
  - "40 CFR Part 142"
rin: "2040-AF10"
fr_citation: "77 FR 39182"
fr_volume: 77
docket_ids:
  - "Docket No. EPA-HQ-OW-2009-0090"
  - "FRL-9660-4"
---

#  Revisions to the Unregulated Contaminant Monitoring Regulation (UCMR 3) for Public Water Systems

**Correction**

In rule document 2012-9978 appearing on pages 26072-26101 in the issue of Wednesday, May 2, 2012, make the following correction:

On pages 26072-26073, the table entitled “EXHIBIT 1—APPLICABILITY OF UCMR 3 TO WATER UTILITIES BY SYSTEM TYPE AND SIZE” should read as set forth below:

|  |  |  |  |
| --- | --- | --- | --- |
|  |  |  |  |
| CWS & NTNCWS | Requires all systems to monitor for List 1 chemicals | Requires 800 randomly selected systems to monitor for List 1 chemicals. EPA will pay for the analysis of samples. |  |
| TNCWS | No requirements | No Requirements. |  |
|  |  |  |  |
| CWS & NTNCWS | Requires all systems serving more than 100,000, and 320 randomly selected systems serving 10,001 to 100,000 to monitor for List 2 chemicals | Requires 480 randomly selected systems to monitor for List 2 chemicals. EPA will pay for the analysis of samples. |  |
| TNCWS | No requirements | No Requirements. |  |
|  |  |  |  |
| CWS, TNCWS & NTNCWS | No requirements | Requires 800 randomly selected systems to permit EPA to sample and analyze List 3 microbes. The selected systems will be served by non-disinfecting ground water wells in vulnerable areas. EPA will pay for the analysis of samples. |  |