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U.S. Senators, House Members File Amicus Brief in Suit to Repeal WOTUS

USEPA Announces Final MS4 General Permit Remand Rule



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109 Chemicals and Microbial Contaminants Included in USEPA's Final CCL4


USEPA announced its final Contaminant Candidate List 4 (CCL4) in mid-November. The Final CCL4 includes 97 chemicals or chemical groups and 12 microbial contaminants. The list includes chemicals used in commerce, pesticides, biological toxins, disinfection byproducts, pharmaceuticals and waterborne pathogens.  The list can viewed in its entirety by clicking here.

The CCL4 is a list of contaminants that are not currently subject to any proposed or promulgated national primary drinking water regulations, but are known or anticipated to occur in public water systems. However, USEPA says contaminants listed on the CCL may require future regulation under the Safe Drinking Water Act (SDWA).

The most recent monitoring for unregulated contaminants occurred between 2013 and 2015 as part of the Unregulated Contaminant Monitoring Rule (UCMR3).  USEPA will consider the data collected and determine whether any drinking water standards need to be revised. This information can accessed by clicking here. Utilities can anticipate sampling for the UCMR4 in 2018 - 2020.  Additional UCMR4 information can be found here.

For additional information about CCL4, UCMR4, or any other current drinking water standards, contact Nate Weisenburger, AE2S Drinking Water Practice Leader, at Nate.Weisenburger@ae2s.com.

If you have any questions concerning the content of this newsletter,
please contact Heather Syverson at 701-364-9111 or Heather.Syverson@ae2s.com.
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