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Waste discharge permits protect human health, the environment, and the public's investment in wastewater facilities by ensuring that discharges from categorial businesses meet federal categorical pretreatment standards and the county's local limits for pollutants in wastewater.

Discharge applications

Self-monitoring report forms


These are technology-based limitations on pollutant discharges to POTWs promulgated by EPA in accordance with Section 307 of the Clean Water Act that apply to specified process wastewater of particular industrial categories, see 40 CFR 403.6 and 40 CFR Parts 405- 471.

The Environmental Protection Agency maintains a complete list of existing federal categorical effluent guidelines, organized by industry category. 

About national categorical pretreatment standards

The federal government has established national industrial effluent guidelines and pretreatment standards for specific industries, called categorical dischargers. These must obtain a full King County permit regardless of their wastewater discharge volume. Categorical industries include the following:

  • Aluminum forming
  • Battery manufacturing 
  • Centralized waste treatment 
  • Circuit-board manufacturing 
  • Coil coating 
  • Copper forming 
  • Electrical/electronic components 
  • Electroplating 
  • Inorganic chemical manufacturing 
  • Iron/steel manufacturing 
  • Leather tanning finishing 
  • Metal finishing 
  • Metal foundries 
  • Nonferrous metal manufacturing 
  • Pesticide manufacturing 
  • Petroleum refining 
  • Pharmaceutical manufacturing 
  • Porcelain enameling 
  • Pulp/paper mills 
  • Wood preserving