Toutle STP
200 S Toutle Rd, Toutle, WA 98649 · Cowlitz County · Publicly Owned Treatment Works
- Average flow
- 0.06 MGD
- Design flow
- 0.5 MGD
- NPDES permit
- WA0037770
- Effective
- Permit expires
- June 2030
- Population served
- 690
- CWNS 2022
Toutle STP is a publicly owned wastewater treatment works in Toutle, Cowlitz County, Washington treating an average of 0.06 million gallons per day against a permitted design capacity of 0.5 MGD, serving about 690 residents. It discharges under NPDES permit WA0037770 (effective), which expires in June 2030, with 7 recorded violations in the last three years.
Treatment technology
2 treatment structures and unit processes identified at Toutle STP.
Available with a free Klarifi account
See the full treatment train at Toutle STP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 7
- Effluent violations
- 2
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Toutle STP.
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Nearby wastewater treatment plants in Washington
Castle Rock · 9 mi away
0.37 MGD
Toledo · 10 mi away
0.1 MGD
Toledo · 11 mi away
0.002 MGD
Mossyrock · 14 mi away
0.02 MGD
Winlock · 15 mi away
0.54 MGD
Ryderwood · 16 mi away
0.1 MGD
Chehalis · 17 mi away
0.07 MGD
Longview · 17 mi away
17.43 MGD
Toutle 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 November 29, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Sludge dewatering · Biological nutrient removal · all terms