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The following table contains detailed information about oil and gas extraction NPDES permits to discharge wastewater to waters of the U.S. for states in the U.S. where permits were found during a systematic search. It includes general (G) and individual (I) permits. Note: When searching for general permits, it was not clear which permits were specific to oil and gas extraction operations; therefore, the numbers available in the table are not conclusive. For individual permits, an asterisk * was added to states where permits were not found due to procedural deficiencies or lack of transparency

July 1, 2019 Mr. Jesse Pritts U.S. Environmental Protection Agency Office of Water (4303T) 1200 Pennsylvania Avenue, N.W. Washington, DC 20460 Submitted via email to: oil-and-gas-study@epa.gov and pritts.jesse@epa.gov Dear Mr. Pritts: On behalf of our members and supporters, Clean Water Action/Clean Water Fund appreciates the opportunity to provide input to US EPA on the Study of Oil and Gas Extraction Wastewater Management Under the Clean Water Act (Draft), No. EPA‐821‐R19‐ 001 (hereinafter referred to as the “Draft Study”). The Draft Study, insofar as it addresses the question of whether or

Clean Water Action strongly supports Denver Water’s commitment to seek an alternative to orthophosphate that will achieve the same or greater reduction in lead exposure risk for its customers.