C2-2012-9978. 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 size1
	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 size1
	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.