Walnut Ridge
High Ridge, MO · Jefferson County · Publicly Owned Treatment Works
- Average flow
- 0.0036 MGD
- Design flow
- —
- NPDES permit
- MO0095281
- Effective
- Permit expires
- October 2027
- Population served
- 144
- CWNS 2022
Walnut Ridge is a publicly owned wastewater treatment plant in High Ridge, Jefferson County, Missouri treating an average of 0.0036 million gallons per day, serving about 144 residents. Treatment on site includes biological treatment, other, biosolids aerobic digestion, dechlorination, disinfection, chlorine/ chloramine, screening. It discharges under NPDES permit MO0095281 (effective), which expires in October 2027, with 0 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Biological Treatment, Other
unit processBiosolids Aerobic Digestion
unit processDechlorination
unit processDisinfection, chlorine/ chloramine
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 Walnut Ridge.
No verified contacts on file yet
Klarifi verifies plant and municipal decision-makers continuously. Start a free trial to browse contacts at nearby plants and flag this one for verification.
Nearby wastewater treatment plants in Missouri
House Springs · 2 mi away
0.07 MGD
House Springs · 2 mi away
0.04 MGD
House Springs · 2 mi away
0.0002 MGD
House Springs · 3 mi away
0.03 MGD
House Springs · 3 mi away
0.17 MGD
High Ridge · 3 mi away
0.02 MGD
House Springs · 4 mi away
0.01 MGD
Eureka · 4 mi away
0.13 MGD
Walnut Ridge: 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.