St John WWTP
402 W Front St, Saint John, WA 99171 · Whitman County · Publicly Owned Treatment Works
- Average flow
- 0.07 MGD
- Design flow
- 0.6 MGD
- NPDES permit
- WA0021229
- Administratively continued
- Permit expires
- June 2019
- Population served
- 599
- CWNS 2022
St John WWTP is a publicly owned wastewater treatment works in Saint John, Whitman County, Washington treating an average of 0.07 million gallons per day against a permitted design capacity of 0.6 MGD, serving about 599 residents. It discharges under NPDES permit WA0021229 (administratively continued), which expires in June 2019, with 18 recorded violations in the last three years.
Treatment technology
Treatment structures and unit processes at St John WWTP.
Treatment structure data not yet analyzed for this facility.
Compliance snapshot (last 3 years)
- Total violations
- 18
- Effluent violations
- 18
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for St John WWTP, with validated emails and direct phone numbers.
Unlock 1 verified contact
Names, validated emails and direct phone numbers for decision-makers at St John WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Washington
Endicott · 12 mi away
0.08 MGD
Rosalia · 14 mi away
0.11 MGD
Oakesdale · 17 mi away
0.09 MGD
Colfax · 17 mi away
0.33 MGD
Spangle · 25 mi away
0.02 MGD
Tekoa · 25 mi away
0.12 MGD
Palouse · 27 mi away
0.07 MGD
Fairfield · 29 mi away
0.06 MGD
St John WWTP: 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 October 6, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Significant industrial user · WWTP · all terms