Pretreatment Regulations

The LOTT Clean Water Alliance administers and enforces an Industrial Pretreatment Program through agreement with the Cities of Lacey, Olympia, and Tumwater, and Thurston County. LOTT's Discharge and Industrial Pretreatment Regulations are adopted by the partner jurisdictions as their respective ordinances. The ordinances set forth uniform requirements for all discharges into the sewer collection systems and wastewater treatment facilities. This program enables the Cities and County to comply with all applicable State and Federal laws required by the Clean Water Act of 1977, and amendments thereof, and the General Pretreatment Regulations (40 CFR, Part 403), which includes submission of an annual report to the Washington State Department of Ecology. The objectives of the program are:

  • To protect Publicly Owned Treatment Works personnel who may be affected by wastewater and biosolids in the course of their employment, and to protect the general public.
  • To prevent the introduction of pollutants into the Publicly Owned Treatment Works that will interfere with the operation of the system, or contaminate the resulting biosolids.
  • To prevent the introduction of pollutants into the Publicly Owned Treatment Works, which will pass through the system inadequately treated, into receiving waters or the atmosphere, or otherwise be incompatible with the system.
  • To ensure that the quality of the wastewater treatment plant biosolids is maintained at a level which allows its use and disposal in compliance with applicable statutes and regulations.
  • To provide for equitable distribution of wastewater costs among dischargers, and establish a system of fees and charges that recovers the cost of the Industrial Pretreatment Program.


Discharge and Industrial Pretreatment Regulations (PDF)