Pomeroy Sewage Treatment Plant
Pomeroy, WA · Garfield County · Publicly Owned Treatment Works
- Average flow
- 0.09 MGD
- Design flow
- 0.68 MGD
- NPDES permit
- WA0021164
- Effective
- Permit expires
- October 2023
- Population served
- 1,631
- CWNS 2022
Pomeroy Sewage Treatment Plant is a publicly owned wastewater treatment works in Pomeroy, Garfield County, Washington treating an average of 0.09 million gallons per day against a permitted design capacity of 0.68 MGD, serving about 1,631 residents. Treatment on site includes clarifiers. It discharges under NPDES permit WA0021164 (effective), which expires in October 2023, with 0 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
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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
1 verified contact for Pomeroy Sewage Treatment Plant, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Pomeroy Sewage Treatment Plant, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Washington
Dayton · 21 mi away
0.19 MGD
Colton · 24 mi away
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Pullman · 27 mi away
2.13 MGD
Clarkston · 27 mi away
0.71 MGD
Clarkston · 28 mi away
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Waitsburg · 30 mi away
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Colfax · 31 mi away
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Palouse · 39 mi away
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Pomeroy Sewage 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 September 10, 2026.