Mawc, Eureka WWTF
Eureka, MO · St. Louis County · Publicly Owned Treatment Works
- Average flow
- 1.13 MGD
- Design flow
- —
- NPDES permit
- MO0039659
- Expired
- Permit expires
- September 2022
- Population served
- —
- CWNS 2022
Mawc, Eureka WWTF is a publicly owned wastewater treatment works in Eureka, St. Louis County, Missouri treating an average of 1.13 million gallons per day. Treatment on site includes aerated lagoons, disinfection, uv, lagoon, aerobic, screening. It discharges under NPDES permit MO0039659 (expired), which expires in September 2022, with 6 recorded violations in the last three years. Planned upgrades on record: biological treatment, other.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Aerated lagoons
Unlock
Disinfection, UV
unit processLagoon, Aerobic
unit processScreening
unit processBiological Treatment, Other
planned upgradeUnlock exact unit counts →
Compliance snapshot (last 3 years)
- Total violations
- 6
- Effluent violations
- 6
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Mawc, Eureka WWTF.
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Nearby wastewater treatment plants in Missouri
Eureka · 2 mi away
0.13 MGD
High Ridge · 3 mi away
0.02 MGD
High Ridge · 4 mi away
0.0036 MGD
House Springs · 6 mi away
0.17 MGD
House Springs · 6 mi away
0.04 MGD
House Springs · 6 mi away
0.07 MGD
House Springs · 6 mi away
0.0002 MGD
House Springs · 7 mi away
0.03 MGD
Mawc, Eureka WWTF: 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 April 24, 2025.