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Nuclear Waste Program


Waste Water Discharge Permits

The purpose of the State wastewater discharge permit program (WAC 173-216) is to implement a state permit program applicable to the discharge of waste materials from industrial, commercial, and municipal operations into ground and surface waters of the state and into municipal sewerage systems. However, this regulation does not apply to discharges regulated by the National Pollutant Discharge Elimination System (NPDES) Permit Program or discharge of pollutants into waters of the state regulated by the waste discharge general permit program. Some examples of categories of Ecology’s Washington General permits (WAG) (WAC 173-226) are dischargers like concrete batch plants, seafood processors, dairy farms, etc.

To view each permit click on the individual links below.

Waste Water Discharge


At Hanford, the five state wastewater discharge permits are described below:

ST-4500 • 200 Area Effluent Treatment Facility (ETF) (Permit Number ST- 4500): 

Enforceable Permit:

Per Washington Administrative Code (WAC) 173-216, the Department of Ecology (Ecology), as the permitting authority, formally transmits the State Waste Discharge Permit Number ST0004500 permit to the permittee U.S. Department of Energy.

Permit Number: ST0004500
Issue Date: December 15, 2014
Effective: January 1, 2015
Expiration Date: December 31, 2019


The Effluent Treatment Facility (ETF) is located in the 200 East Area of the Hanford Site. The ETF influent consists of individual waste streams from many Hanford facilities. Major sources include process condensate from the 242-A Evaporator, and leachate from land waste disposal sites. Most liquid waste streams to be treated at ETF are initially stored at the Liquid Effluent Retention Basin (LERF), located near the ETF. The treated effluent is sent to the State Approved Land Disposal Site (SALDS).  SALDS is located north of the 200 West Area. Its location was selected to avoid potential mobilization of contaminates from historical disposal practices, as well as to give groundwater a long travel time to the Columbia River. This permit provides the terms and conditions that will regulate the discharge from the Effluent Treatment Facility to the State Approved Land Disposal Site. 

ST-4502 • 200 Area Treated Effluent Disposal Facility (TEDF) (Permit Number ST- 4502):

The TEDF facility provides a collection, conveyance, and disposal system for treated effluent from buildings in the 200 Areas. It is locat