Omak Wastewater Treatment Plant
Omak, WA · Okanogan County · Publicly Owned Treatment Works
- Average flow
- 0.53 MGD
- Design flow
- 3.78 MGD
- NPDES permit
- WA0020940
- Administratively continued
- Permit expires
- December 2020
- Population served
- 5,412
- CWNS 2022
Omak Wastewater Treatment Plant is a publicly owned wastewater treatment works in Omak, Okanogan County, Washington treating an average of 0.53 million gallons per day against a permitted design capacity of 3.78 MGD, serving about 5,412 residents. Treatment on site includes clarifiers, carrousels / oxidation ditches. It discharges under NPDES permit WA0020940 (administratively continued), which expires in December 2020, with 0 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
- 0
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Omak Wastewater Treatment Plant.
No verified contacts on file yet
Klarifi verifies plant and municipal decision-makers continuously. Start a free trial to browse contacts at nearby plants and flag this one for verification.
Nearby wastewater treatment plants in Washington
Okanogan · 4 mi away
0.15 MGD
Tonasket · 21 mi away
0.1 MGD
Brewster · 24 mi away
0.18 MGD
Twisp · 26 mi away
—
Bridgeport · 27 mi away
—
Winthrop · 30 mi away
0.06 MGD
Oroville · 37 mi away
—
Coulee Dam · 39 mi away
0.16 MGD
Omak Wastewater Treatment Plant: 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 20, 2025.