Coulee Dam WWTP
Coulee Dam, WA · Douglas County · Publicly Owned Treatment Works
- Average flow
- 0.16 MGD
- Design flow
- 0.5 MGD
- NPDES permit
- WA0020281
- Administratively continued
- Permit expires
- November 2022
- Population served
- 2,020
- CWNS 2022
Coulee Dam WWTP is a publicly owned wastewater treatment works in Coulee Dam, Douglas County, Washington treating an average of 0.16 million gallons per day against a permitted design capacity of 0.5 MGD, serving about 2,020 residents. It discharges under NPDES permit WA0020281 (administratively continued), which expires in November 2022, with 0 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Treatment structure data not yet analyzed for this facility.
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 Coulee Dam WWTP.
No verified contacts on file yet
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Nearby wastewater treatment plants in Washington
Grand Coulee · 2 mi away
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Wilbur · 18 mi away
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Bridgeport · 33 mi away
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Brewster · 38 mi away
0.18 MGD
Okanogan · 39 mi away
0.15 MGD
Omak · 39 mi away
0.53 MGD
Davenport · 44 mi away
0.15 MGD
Chelan · 48 mi away
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Coulee Dam WWTP: 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 October 5, 2025.