Skip Ribbon Commands
Skip to main content








The District's Pretreatment Program administers local, state, and federal regulations to control pollutants discharged from commercial and industrial customers that may disrupt the collection and treatment system.  The regulatory federal language refers to the collection system and treatment facilities as the "Publicly Owned Treatment Works" (POTW).  Our POTW consists of six wastewater facilities treating an average of approximately 100 million gallons per day, twenty-three pump stations, and over 2,100 miles of sanitary sewer collection pipelines. The Pretreatment Program administers and enforces the regulations in order to:  

  • Protect the District's wastewater collection systems, treatment plants, and employees
  • Allow the reclamation of treated effluent for irrigation and other uses
  • Maintain water quality in the Las Vegas Wash

POTWs are designed to treat typical household wastes and biodegradable commercial and industrial wastes. Commercial and industrial facilities that discharge toxic pollutants to the treatment plants may be very detrimental to treatment plant processes and the environment. Industrial and certain commercial customers that discharge pollutants into the POTW are required to install, operate, and adequately maintain pretreatment equipment to remove pollutants that could otherwise damage, obstruct, interfere with, or pass through the POTW. Examples of such pollutants include heavy metals, cyanides, toxic organics, and acidic or basic wastes from industrial operations. Heavy metals and some organic chemicals which cannot be treated by the biological treatment process can threaten the bacteria which are necessary to the treatment process at the wastewater treatment plants.

Wastewater from restaurants and other food service industries are often more problematic. This is due to the prevalence of conventional pollutants such as grease, organic matter and solids. Grease can clog and overload the sewer system. Processing these food contaminants raises the cost of treating wastewater. The installation and proper maintenance of grease interceptors are an important component of keeping grease out of the collection and treatment systems.

Our Pretreatment Program protects the treatment process and keeps costs down by working with local businesses to minimize pollutant discharges. Activities of the District's Pretreatment Program include the review of pretreatment designs, the issuance of permits, facility inspections, monitoring of facilities (wastewater sample collection), review of industry self-monitoring reports, and enforcement actions.

 Links and Forms