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Program Purpose

The Industrial Pretreatment program is a federally mandated program under the Clean Water Act, which controls the discharges of commercial and industrial facilities.

Butler County's wastewater treatment plants are designed to handle domestic waste from a typical household, not untreated industrial waste. Wastewater discharged from a factory, for example, may contain pollutants that could interfere with the operation of the county's treatment plant. BCWS' industrial pretreatment program helps control the wastewater flow coming into the treatment facilities.

Program Goals

Certain customers, often known as Significant Industrial Users (SIUs), must be permitted under the industrial pretreatment program and must control the quality of their discharge by installing appropriate treatment systems that will "pretreat" their wastewater prior to discharging into the sewer system. BCWS regulates SIUs through wastewater sampling and on-site inspections of commercial and industrial facilities.

The goals of the program are:

  • Prevent the introduction of pollutants into our treatment plants that will interfere with treatment operations
  • Prevent the introduction of pollutants into our treatment plants that cannot be treated and will pass through the plant and into the environment
  • Generally reduce the health and environmental risk of pollution.


Learn more about the USEPA's Federal Pretreatment Program  requirements and guidelines


*SIU = A Significant Industrial User is defined as one who is regulated by federal standards (Categorical Users) or one who discharges 25,000 gallons or more of process wastewater per day. SIUs are required to maintain a Wastewater Discharge Permit. BCWS currently regulates 40 SIUs.