The City's Wastewater Utility's goal is to protect public and environmental health by ensuring that wastewater is collected and conveyed to treatment and disposal facilities with minimal risk.
Septic to Sewer Conversion Options
Learn more about the Septic to Sewer Conversion program.
What NOT to Flush Down the Drain
Learn more about what's not flushable, and why.
Options for Disposing of RV Waste
Learn more about free options to dispose of RV waste in the Olympia area.
Within Olympia and its urban growth area, the wastewater system consists of approximately 200 miles of gravity pipes, 35 miles of pressure pipes, 27 pump stations, and 1,500 STEP systems owned and maintained by the City; 4,000 privately owned and maintained onsite sewage systems; and regional collection and treatment facilities owned by the LOTT Alliance (Lacey-Olympia-Tumwater-Thurston County).
Wastewater, also known as sewage, comes from residential, commercial, and industrial users. Flow from storm drains is not generally combined with wastewater, although there are limited exceptions, including several locations in the downtown Olympia area. Wastewater is a combination of water, suspended solids, and dissolved solids.