2 plants indexed.
Washington STP 1 serves approximately 6,038 people in Washington, Illinois, treating municipal wastewater before discharge. The plant operates under the U.S. Clean Water Act's NPDES permit program.
WASHINGTON STP 2 serves Washington, Illinois, treating wastewater for approximately 13,325 residents. The plant operates under the U.S. Clean Water Act framework, with discharge regulated by the Illinois Environmental Protection Agency.