The EPA promulgated pretreatment standards to reduce discharges of mercury from dental offices into publicly owned treatment works (POTWs).The Dental Office Category is codified under 40 CFR Part 441. 

Dental Dischargers that have been in business at the current address on or before July 14, 2017, are considered an Existing Source Dental Discharger (PSES 40 CFR 441.30) and must complete a one-time compliance report and submit it to the City of Tracy Utilities Environmental Compliance Division 90 days after the transfer of ownership.

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