Pomeroy Sewage Treatment Plant
244 W Pataha St, Pomeroy, WA 99347 · Garfield County · Publicly Owned Treatment Works
- Average flow
- 0.12 MGD
- Design flow
- 0.68 MGD
- NPDES permit
- WA0021164
- Administratively continued
- 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 0.12 million gallons per day against a permitted design capacity of 0.68 MGD, serving about 1,631 residents. It discharges under NPDES permit WA0021164 (administratively continued), which expires in October 2023, with 0 recorded violations in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in September 2024.
Treatment technology
One treatment structure or unit process identified at Pomeroy Sewage Treatment Plant.
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See the full treatment train at Pomeroy Sewage Treatment Plant: structures, unit processes and planned upgrades, with exact unit counts.
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.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for Pomeroy Sewage Treatment Plant in EPA's ICIS system.
- Formal actions
- 1
- 1 since FY2020
- Penalties assessed
- $901
- all cases
- Compliance actions
- $7,500
- required by EPA orders
- EPA inspections
- 0
- none on record
Latest case · Sep 2024
CITY OF POMEROY WWTP - ESA (CWA NPDES)
Administrative order · CWA, NPDES Permit Violations · Final Order With Penalty · Penalty $901 · Compliance actions $7,500
EPA's description of the case:
“On September 10, 2024, Region 10 filed an expedited settlement agreement resolving CWA violations of the City of Pomeroy's wastewater permit at its wastewater treatment plant in Pomeroy, Washington.…”
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Source: EPA ECHO, civil enforcement case 10-2024-0138.
Full case history with a free Klarifi account
Every action against Pomeroy Sewage Treatment Plant with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
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
0.25 MGD
Colton · 24 mi away
0.08 MGD
Pullman · 27 mi away
2.46 MGD
Clarkston · 27 mi away
0.69 MGD
Clarkston · 28 mi away
0.06 MGD
Waitsburg · 30 mi away
0.16 MGD
Colfax · 31 mi away
0.33 MGD
Endicott · 32 mi away
0.08 MGD
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 October 26, 2026; facility record last updated September 10, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Ozonation · Activated sludge · all terms