Dental amalgam rule

Effective July 14, 2017 the U.S. EPA adopted Effluent Limitations Guidelines and Standards for the Dental Category Final Rule to reduce the discharge of mercury-containing amalgam from dental practices into publicly owned treatment works (POTWs). (40 CFR Part 441).

What dental facilities are impacted by the rule?

Dental offices, schools and clinics where dentistry is practiced that discharge to a publicly owned treatment work (POTW) (e.g., municipal sewage system) are subject to this rule. It does not apply to mobile units or to offices where the practice of dentistry consists only of the following dental specialties: oral pathology, oral and maxillofacial radiology, oral and maxillofacial surgery, orthodontics, periodontics, or prosthodontics.

What do affected dental facilities need to do?

In order to comply with the regulation, dental offices must-- 

  • operate and maintain an amalgam separator compliant with ISO11143 (2008)
  • avoid discharging scrap amalgam or oxidizing or acidic cleaners with a pH less than 6 or greater than 8, such as bleach, chlorine or peroxide; and
  • certify their practice's compliance with the regulation by submitting a one-time compliance report and retain a copy for their records

Existing Sources (those discharging prior to July 14, 2017) must be in compliance with the standards by July 14, 2020 and submit a one-time compliance report certifying such by October 12, 2020.

New Sources (those starting discharging to the sewer after July 14, 2017) must be in compliance with the standards immediately and submit a one-time compliance report certifying such within 90 days after the first discharge to a POTW. If your facility is a new source that has been operating for more than 90 days and has not yet submitted a one-time compliance report, please submit as soon as possible.

If you discharge to a POTW with a pretreatment program, you may have different reporting requirements. Check here to see if your city has a pretreatment program and who you would need to contact for further information.

One Time Compliance Report

Three Ways to Submit

Note: Retain a copy of this form for your own records.

1. Online: Click here to fill out the online form

A valid e-mail address is required to submit this form online. You will verify the document and be able to download a copy for your own records through the e-mail address you provide when you first access the document.

2. By mail: Download, complete, and mail to

Kansas Environmental Assistance Program

2323 Anderson Ave., Suite 300

Manhattan, KS 66502

3. By e-mail: Download, complete, scan and e-mail to



Questions? Check the frequently asked questions or contact us at or (800) 578-8898

Summary of dental amalgam rule

Best management practices


Informational Brochure

Dental Effluent Guidelines

Fact Sheet: Effluent Limitations Guidelines and Standards for Dental Offices.

Effluent Limitations Guidelines and Standards for the Dental Category.

American Dental Association-- Amalgam Separators and Waste Best Management.


K-State Pollution Prevention Institute
(800) 578-8898 |
2323 Anderson Ave., Suite 300, Manhattan, KS 66506