Regulatory Jurisdiction for On-site Wastewater (Sewage) Systems

System Design Flow: 0 - 3,499 gallons per day

Regulatory Jurisdiction: Local Health Officer

Local Health Officer has authority and approval over systems with design flows through any common point up to 3,499 gallons per day.


System Design Flow: 3,500 - 100,000 gallons per day

Regulatory Jurisdiction: Department of Health Large On-site Sewage System Program

Washington State Department of Health LOSS Program per Chapter 70A.115 RCW, has authority and approval over:


System Design Flow: Above 100,000 gallons per day

Regulatory Jurisdiction: Department of Ecology

Washington State Department of Ecology has authority and approval over: