Washington WWTP
Washington, MO · Franklin County · Publicly Owned Treatment Works
- Average flow
- 1.65 MGD
- Design flow
- —
- NPDES permit
- MO0025810
- Administratively continued
- Permit expires
- March 2026
- Population served
- 4,684
- CWNS 2022
Washington WWTP is a publicly owned wastewater treatment works in Washington, Franklin County, Missouri treating an average of 1.65 million gallons per day, serving about 4,684 residents. Treatment on site includes clarifiers, biological treatment, other, biosolids aerobic digestion, biosolids anaerobic digestion without energy recovery, disinfection, uv and other unit processes. It discharges under NPDES permit MO0025810 (administratively continued), which expires in March 2026, with 2 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
Unlock
Biological Treatment, Other
unit processBiosolids Aerobic Digestion
unit processBiosolids Anaerobic Digestion without Energy Recovery
unit processDisinfection, UV
unit processScreening
unit processUnlock exact unit counts →
Compliance snapshot (last 3 years)
- Total violations
- 2
- 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 Washington WWTP.
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Nearby wastewater treatment plants in Missouri
Washington · 2 mi away
0.006 MGD
Washington · 4 mi away
0.03 MGD
Washington · 5 mi away
0.009 MGD
Washington · 5 mi away
0.07 MGD
Augusta · 6 mi away
0.03 MGD
Villa Ridge · 6 mi away
0.002 MGD
Marthasville · 6 mi away
0.09 MGD
Villa Ridge · 7 mi away
0.001 MGD
Washington 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 September 11, 2026; facility record last updated May 20, 2025.