Washougal STP
3900 Wa-14, Washougal, WA 98671 · Clark County · Publicly Owned Treatment Works
- Average flow
- 1.09 MGD
- Design flow
- —
- NPDES permit
- WA0037427
- Administratively continued
- Permit expires
- November 2016
- Population served
- 16,266
- CWNS 2022
Washougal STP is a publicly owned wastewater treatment works in Washougal, Clark County, Washington treating an average of 1.09 million gallons per day, serving about 16,266 residents. It discharges under NPDES permit WA0037427 (administratively continued), which expires in November 2016, with 0 recorded violations in the last three years.
Treatment technology
4 treatment structures and unit processes identified at Washougal STP.
Available with a free Klarifi account
See the full treatment train at Washougal STP: 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.
Key contacts
3 verified contacts for Washougal STP, with validated emails and direct phone numbers.
Unlock 3 verified contacts
Names, validated emails and direct phone numbers for decision-makers at Washougal STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Washington
Yacolt · 11 mi away
—
North Bonneville · 18 mi away
0.07 MGD
Stevenson · 23 mi away
0.31 MGD
Vancouver · 23 mi away
—
La Center · 26 mi away
0.31 MGD
Ridgefield · 27 mi away
0.37 MGD
Kalama · 39 mi away
0.49 MGD
Bingen · 43 mi away
0.32 MGD
Washougal 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 July 3, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Equalization tank · Centrate · all terms