Othello STP
Othello, WA · Adams County · Publicly Owned Treatment Works
- Average flow
- 1.27 MGD
- Design flow
- 10 MGD
- NPDES permit
- WA0022357
- Effective
- Permit expires
- September 2025
- Population served
- 8,494
- CWNS 2022
Othello STP is a publicly owned wastewater treatment works in Othello, Adams County, Washington treating an average of 1.27 million gallons per day against a permitted design capacity of 10 MGD, serving about 8,494 residents. Treatment on site includes uncovered lagoons. It discharges under NPDES permit WA0022357 (effective), which expires in September 2025, with 85 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Uncovered lagoons
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Compliance snapshot (last 3 years)
- Total violations
- 85
- Effluent violations
- 83
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Othello STP, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Othello STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Washington
Ellensburg · 37 mi away
0.03 MGD
Richland · 39 mi away
6.31 MGD
Benton City · 40 mi away
0.22 MGD
Quincy · 45 mi away
0.03 MGD
Prosser · 49 mi away
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Sunnyside · 52 mi away
1.31 MGD
Sunnyside · 52 mi away
1.17 MGD
Grandview · 53 mi away
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Othello STP: 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 April 13, 2025.