Walnut Ridge
Walnut Valley Dr, High Ridge, MO 63049 · Jefferson County · Publicly Owned Treatment Works
- Average flow
- 0.0041 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 0.0041 million gallons per day, serving about 144 residents. It discharges under NPDES permit MO0095281 (effective), which expires in October 2027, with 0 recorded violations in the last three years.
Treatment technology
5 treatment structures and unit processes identified at Walnut Ridge.
Available with a free Klarifi account
See the full treatment train at Walnut Ridge: structures, unit processes and planned upgrades, with 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.
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Nearby wastewater treatment plants in Missouri
House Springs · 2 mi away
0.06 MGD
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House Springs · 3 mi away
0.24 MGD
High Ridge · 3 mi away
0.02 MGD
House Springs · 4 mi away
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Eureka · 4 mi away
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House Springs · 4 mi away
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House Springs · 4 mi away
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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 October 26, 2026; facility record last updated September 3, 2024.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · FOG · Equalization tank · all terms