Protecting Public Health and Safety


Dental Office Amalgam Wastewater Compliance Program

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The Environmental Protection Agency (EPA) has promulgated pretreatment standards under the Clean Water Act to reduce discharges of mercury from dental offices into publicly owned treatment works (POTWs). The Dental Effluent Guidelines are codified in the Code of Federal Regulations (CFR), Title 40, Part 441, Effluent Limitations and Standards for the Dental Category.  Existing dental offices (operating prior to the effective date of the"" rule, July 14th 2017) must comply with the rule by July 14th 2020. Dental offices who began practice after July 14th 2017(New Source) must comply immediately. 

This final rule requires dental offices, that replace or remove amalgam, to operate and maintain an amalgam separator and use two Best Management Practices (BMPs) recommended by the American Dental Association (ADA). In addition, this rule requires dental offices to submit a One-Time Compliance Form.

It is El Dorado Irrigation District’s (EID) responsibility under the new regulation to notify all of the dental offices who discharge to its POTW facilities of the regulation requirements and ensure compliance with the new regulation. To comply, EID will require all dental offices to submit the aforementioned One-Time Compliance Form. All non-exempt dental offices must also install and maintain an approved amalgam separator. Please find more detailed information below about this program and how to comply.

If you have questions, please contact us at (530) 295-6867or email us at

EID Program Documents

Additional Informational Resources

Information from the EPA

Other Resources

Contact Information

EID’s Industrial Pretreatment and Pollution Prevention Program
2890 Mosquito Road, Placerville, California 95667
Phone: 530-295-6867   |  Fax: 530-344-5678