Tonasket POTW
Tonasket, WA · Okanogan County · Publicly Owned Treatment Works
- Average flow
- 0.1 MGD
- Design flow
- —
- NPDES permit
- WA0052337
- Effective
- Permit expires
- April 2031
- Population served
- 1,173
- CWNS 2022
Tonasket POTW is a publicly owned wastewater treatment works in Tonasket, Okanogan County, Washington treating an average of 0.1 million gallons per day, serving about 1,173 residents. Treatment on site includes aerated lagoons, uncovered lagoons. It discharges under NPDES permit WA0052337 (effective), which expires in April 2031, with 7 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 7
- Effluent violations
- 7
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Tonasket POTW, with validated emails and direct phone numbers.
Unlock 1 verified contact
Names, validated emails and direct phone numbers for decision-makers at Tonasket POTW, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Washington
Oroville · 15 mi away
—
Omak · 21 mi away
0.53 MGD
Okanogan · 25 mi away
0.15 MGD
Winthrop · 37 mi away
0.06 MGD
Twisp · 39 mi away
—
Brewster · 45 mi away
0.18 MGD
Bridgeport · 48 mi away
—
Coulee Dam · 55 mi away
0.16 MGD
Tonasket POTW: frequently asked questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed September 11, 2026; facility record last updated November 8, 2025.