In June 2017, the US Environmental Protection Agency (EPA) published Dental Effluent Guidelines (40 CFR Part 441) to reduce the discharge of mercury from dental offices to municipal wastewater treatment plants. 

"Dental Dischargers" subject to the EPA rule must:  

1. Install an ISO approved amalgam separator
2. Implement two Best Management Practices
3. Conduct on-going operation and maintenance of the amalgam separator and maintain associated documentation and records
4. Submit a One-Time Compliance Report to:                                                                                   

City of Greensboro
Industrial Waste Section - TZ Osborne POTW
2350 Huffine Mill Rd.
McLeansville, NC 27301 

The City's July 7, 2020 memo, Compliance with 40 CFR Part 441, includes applicable definitions, requirements, and deadlines for existing dental discharges, new dental discharges, dental discharges that have changed ownership.

Additional Documents:

2017 City of Greensboro memo re: publication of EPA Dental Rule