Union East STP
Union, MO · Franklin County · Publicly Owned Treatment Works
- Average flow
- 0.23 MGD
- Design flow
- —
- NPDES permit
- MO0121312
- Administratively continued
- Permit expires
- June 2025
- Population served
- 8,000
- CWNS 2022
Union East STP is a publicly owned wastewater treatment works in Union, Franklin County, Missouri treating an average of 0.23 million gallons per day, serving about 8,000 residents. Treatment on site includes clarifiers, biological treatment, other, biosolids aerobic digestion, disinfection, uv, screening. It discharges under NPDES permit MO0121312 (administratively continued), which expires in June 2025, with 0 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 processDisinfection, UV
unit processScreening
unit processUnlock 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
Decision-makers at Union East STP.
No verified contacts on file yet
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Nearby wastewater treatment plants in Missouri
Villa Ridge · 3 mi away
0.009 MGD
Union · 3 mi away
0.65 MGD
Villa Ridge · 3 mi away
0.002 MGD
Union · 3 mi away
0.001 MGD
Villa Ridge · 4 mi away
0.002 MGD
Villa Ridge · 5 mi away
0.001 MGD
Villa Ridge · 5 mi away
0.001 MGD
St. Clair · 5 mi away
0.44 MGD
Union East 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 September 11, 2026; facility record last updated August 13, 2026.