Dental Office Point Source Category

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The Environmental Protection Agency (EPA) is implementing technology-based Pretreatment Standards under the Clean Water Act to reduce discharges of mercury from dental offices into municipal sewage treatment plants known as Publicly Owned Treatment Works (POTWs).  The new Dental Office Point Source Category requires dental offices to utilize amalgam separators and implement two Best Management Practices (BMPs) as recommended by the American Dental Association.

The Dental Office Point Source Category became effective on July 14, 2017.

  •  Existing Dental Offices must comply with the new standards within 3 years.

  •  New Dental Offices must comply immediately.  

The Orange County Sanitation District (OCSD) is in the process of developing its compliance program for dental offices in the OCSD service area so they can comply with this rule.


To simplify implementation and compliance for the dental offices, the rule establishes that Dental Dischargers are not Significant Industrial Users nor Categorical Industrial Users subject to categorical Pretreatment Standards.  This significantly reduces the reporting requirements that would otherwise apply. However, dental offices within OCSD’s service area must submit a Compliance Report to OCSD as the regulatory Control Authority.

Who is affected?  The rule applies to wastewater discharges to POTWs from offices where the practice of dentistry is performed, including large institutions such as dental schools and clinics; permanent or temporary offices; home offices; and dental offices owned and operated by federal, state, or local governments including military bases.

Are there exemptions?  Yes, the rule does not apply to Dental Dischargers that exclusively practice one or more of the following dental specialties: Oral Pathology; Oral and Maxillofacial Radiology; Oral and Maxillofacial Surgery; Orthodontics; Periodontics; or Prosthodontics, and the rule does not apply to Dental Mobile Units.

Dental Dischargers that do not place dental amalgam, and do not remove dental amalgam except in limited emergency or unplanned, unanticipated circumstances are exempt from any further requirements of the rule as long as they certify such in the Compliance Report to OCSD.


Please click the following links to the EPA website for detailed information on the Dental Category: development document, effluent guidelines, and fact sheet.  The Dental Office Point Source Category regulation is codified at 40 CFR Part 441 .


Please note there are two distinct forms (Dental Discharger Compliance Report and Exempt/Limited Dental Discharger Compliance Report), one for dental offices that place and/or remove amalgam and a second "Exempt/Limited" form for exempt practices as defined in the regulations. The following PDF forms are fillable electronic documents which allow you to save information using any version of Adobe Acrobat, including Acrobat Reader. First, download the applicable form to your computer and use “Save As” to name the file. Next, open the file form and enter your information. Save entered information by using “File, Save” feature in Acrobat. To submit the electronic form, attach the saved file to an email and send to

Dental Discharger Compliance Report(372 Kb PDF)
Limited Dental Discharger Compliance Report (375 Kb PDF)

OCSD is developing a Frequently Asked Questions list to provide additional help in completing the compliance reports.

For more information on OCSD’s Dental Amalgam Program, please contact:


Tom Gaworski – (714) 593-7422  - Corona del Mar, Orange, Tustin

Matt Smith – (714) 593-7439 – Brea, Costa Mesa, Cypress, La Palma, Los Alamitos, Midway City, Placentia, Stanton

Tim Foley – (714) 593-7421 – Fullerton, Garden Grove, Lake Forest, Santa Ana, Seal Beach, Westminster, Yorba Linda

Darrin Canen – (714) 593-7409 – Buena Park, Fountain Valley, Huntington Beach, Newport Beach

Melissa Soriano – (714) 593-7448 – Anaheim, Irvine, La Habra


Page Revised: April 7, 2020