ENVIRONMENTAL PROTECTION AGENCY
40 CFR Parts 141 and 142
[Docket No. EPA-HQ-OW-2009-0090; FRL-9660-4]
RIN 2040-AF10
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:
Exhibit 1—Applicability of UCMR 3 to Water Utilities by System Type and Size
UCMR 3 Assessment Monitoring
System type
System size
1
Serving >10,000
Serving ≤10,000
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.
UCMR 3 Screening Survey
System Type
System size
1
Serving >10,000
Serving ≤10,000
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.
UCMR 3 Pre-Screen Testing
System type
System size
1
Serving >1,000
Serving ≤1,000
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.
1
Based on the retail population, as indicated by SDWIS/Fed on December 31, 2010.