Washington County Pwsd 4 WWTP
Caledonia, MO · Washington County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- —
- NPDES permit
- MO0132519
- Effective
- Permit expires
- August 2027
- Population served
- 190
- CWNS 2022
Washington County Pwsd 4 WWTP is a publicly owned wastewater treatment works in Caledonia, Washington County, Missouri, serving about 190 residents. Treatment on site includes attached growth, aerobic, dechlorination, disinfection, chlorine/ chloramine. It discharges under NPDES permit MO0132519 (effective), which expires in August 2027, with 82 recorded violations in the last three years. Planned upgrades on record: disinfection, uv.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Attached Growth, Aerobic
unit processDechlorination
unit processDisinfection, chlorine/ chloramine
unit processDisinfection, UV
planned upgradeUnlock exact unit counts →
Compliance snapshot (last 3 years)
- Total violations
- 82
- Effluent violations
- 30
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Washington County Pwsd 4 WWTP.
No verified contacts on file yet
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Leadwood · 13 mi away
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Arcadia · 15 mi away
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Washington County Pwsd 4 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 September 3, 2024.