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The Industrial Pretreatment Division administers several programs to ensure the goals of the National Pretreatment Program and the Clean Water Act. The specific goals of the National Pretreatment Program are to protect the sanitary sewer collection system from corrosion and blockages, protect collection system and treatment plant workers from harmful substances, prevent pass-through or treatment interference from pollutants incompatible with treatment, and improve opportunities to recycle biosolids.

The programs include an approved pretreatment program, waste hauler permitting program, on-site sewage facility program, and education opportunities.
The pretreatment program is required by the United States Environmental Protection Agency (US EPA) and approved by the Texas Commission on Environmental Quality. The major elements of the program include:
  • Conducting waste surveys at all commercial and industrial facilities,
  • Permitting facilities that meet the definition of Significant Industrial User,
  • Inspecting and sampling businesses and the collection system to assess compliance with discharge limits, and
  • Identifying the source of any pollutants discharged to the wastewater treatment plant that may pass-through or interfere with treatment.
The US EPA recently announced a new rule for dental offices. All dental facilities must be in compliance with the rule by July 14, 2020. For more information on how to comply, see the dental office information below.
For more information on any of the programs, please contact the industrial pretreatment division at (940) 349-8619.
  • Approved Pretreatment Program

    The City permits, inspects, and collects samples to ensure compliance with federal prohibited discharge standards and specific pollutant limitations. The pretreatment standards and limitations can be found in Ordinance 21-242a. Significant Industrial Users (SIUs) are required to obtain a wastewater discharge permit prior to discharging any process wastes into the sanitary sewer. A facility is determined to be an SIU if it is subject to categorical pretreatment standards, discharges 25,000 gallons per day or more of process wastewater, contributes a large organic loading, or has a reasonable potential for adversely affecting the collection system or treatment plant.

  • Waste Hauler Permitting and FOG Programs

    In order to facilitate proper handling and disposal of wastes generated throughout the City, waste haulers are permitted. The permit program requires registration of all waste vehicles. For liquid waste transporters, such as grease and grit waste, specific reporting requirements are in place to provide tracking of proper disposal. If you would like to apply for a permit or need your grease or grit interceptor pumped, please visit Water-Wastewater for more information.

  • On-Site Sewage Facilities
    On-site sewage facilities (OSSFs), sometimes referred to as septic systems, need proper installation and maintenance in order to safely treat and dispose of wastewater at residences and businesses that are not connected to the sanitary sewer system. For all installations, repairs, and alterations, a permit should be obtained. When OSSFs malfunction, a discharge of untreated wastewater can occur which poses a threat to public health and the environment. The City’s Designated Representative conducts plan review and inspections for installations as well as investigates complaints regarding malfunctioning systems. Regular maintenance of an OSSF is vital to the effective operation of the system.

  • Education Opportunities

    Staff interacts with the public during wastewater plant tours, special events, and media events to encourage proper disposal of items that can clog the sanitary sewer. By properly disposing of grease, cooking oil, wipes, diapers, and paper towels, residents help to precent sewer backups and overflows. Visit Maintain Your Drain to learn more about recycling and proper disposal options.

  • Dental Offices

    Effective July 14,2017, the Environmental Protection Agency (EPA) passed a rule seeking to reduce the discharge of mercury-containing dental amalgam to municipal sewage treatment plants from dental offices in the United States. The rule requires the installation of an amalgam seperator and a one-time compliance report to be submitted. Also, included in the rule are recordkeeping requirements and prohibitions on certain types of cleaners used in dental unit water lines. All offices that open after July 14, 2017 must comply by July 14, 2020, and submit the one-time compliance report by October 12, 2020. The City's one-time compliance report can be found below and under the Important Documents listing. The American Dental Association and US EPA crafted several resources to help dentists comply with the new rule. Please contact the pretreatment program at (940) 349-8619 for assistance. 

    Fact Sheet: Effluent Limitations, Guidelines, and Standards for Dental Office
    Frequently Asked Questionson the Dental Office Category Rule
    EPA Amalgam Recycling Rule Flowchart
    City of Denton: One Time Compliance Certification For Dental Industrial Users