Pe Ell STP
1100 N 2nd St, Pe Ell, WA 98572 · Lewis County · Publicly Owned Treatment Works
- Average flow
- 0.31 MGD
- Design flow
- 2.37 MGD
- NPDES permit
- WA0020192
- Effective
- Permit expires
- August 2031
- Population served
- 727
- CWNS 2022
Pe Ell STP is a publicly owned wastewater treatment works in Pe Ell, Lewis County, Washington treating an average of 0.31 million gallons per day against a permitted design capacity of 2.37 MGD, serving about 727 residents. It discharges under NPDES permit WA0020192 (effective), which expires in August 2031, with 8 recorded violations in the last three years.
Treatment technology
Treatment structures and unit processes at Pe Ell STP.
Treatment structure data not yet analyzed for this facility.
Compliance snapshot (last 3 years)
- Total violations
- 8
- Effluent violations
- 3
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Pe Ell STP.
No verified contacts on file yet
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Nearby wastewater treatment plants in Washington
Winlock · 18 mi away
0.54 MGD
Ryderwood · 18 mi away
0.1 MGD
Rochester · 20 mi away
0.17 MGD
Littlerock · 22 mi away
0.05 MGD
Raymond · 23 mi away
1.01 MGD
Toledo · 24 mi away
0.1 MGD
Toledo · 24 mi away
0.002 MGD
Cathlamet · 26 mi away
0.23 MGD
Pe Ell 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 October 26, 2026; facility record last updated September 3, 2024.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Biosolids · Filter press · all terms