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. This rule went into effect July 14, 2017.

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 Section on or before October 12, 2020 or 90 days after the transfer of ownership.

Dental Dischargers whose first discharge to the City of Tracy sewer system occurs after July 14, 2017 are considered a New Source Dental Discharger (PSES 40 CFR 441.40) and must complete a one-time compliance report and submit it to the City of Tracy Environmental Compliance Section no later than 90 days following the introduction of wastewater into the COT sewer system.

If a dental discharger transfers ownership of the facility, the new owner must submit a new one-time compliance report to the City of Tracy Environmental Compliance Section no later than 90 days after the transfer.

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