King County Industrial Waste Program
The King County Industrial Waste Program (KCIW) administers regulations that allow it to give approval to discharge industrial wastewater to the King County sewer system.
Our regulations are designed to prevent businesses from discharging substances that can degrade the wastewater treatment process, harm workers or facilities, or impact water quality. Since 1969, the KCIW has required many industries to pretreat wastewater before discharging it into the sewer.
By working together, we can help King County recover and recycle beneficial resources, like biosolids from the wastewater treatment process.
Business wastewater survey
Businesses: look for a letter from King County about a required online wastewater survey. Find more information here.
Newsletter and fact sheets
Read KCIW's fall newsletter (PDF), with an update on KCIW’s communication program. View past issues.
KCIW’s general fact sheet: Discharging industrial wastewater to the King County sewer system (PDF). View more fact sheets.