Washington County Pwsd 4 WWTP
Caledonia, MO 63631 · Washington County · Publicly Owned Treatment Works
- Average flow
- 0.004 MGD
- 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 treating an average of 0.004 million gallons per day, serving about 190 residents. It discharges under NPDES permit MO0132519 (effective), which expires in August 2027, with 81 recorded violations in the last three years.
Treatment technology
3 treatment structures and unit processes identified, 1 planned upgrade on record at Washington County Pwsd 4 WWTP.
Available with a free Klarifi account
See the full treatment train at Washington County Pwsd 4 WWTP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 81
- Effluent violations
- 29
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.
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Nearby wastewater treatment plants in Missouri
Caledonia · 1 mi away
—
Bismarck · 9 mi away
2.33 MGD
Bismarck · 11 mi away
0.03 MGD
Potosi · 12 mi away
0.06 MGD
Potosi · 12 mi away
0.09 MGD
Leadwood · 13 mi away
0.09 MGD
Potosi · 13 mi away
0.58 MGD
Ironton · 15 mi away
0.31 MGD
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 October 26, 2026; facility record last updated September 3, 2024.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Sludge dewatering · Biological nutrient removal · all terms