Water Reclamation Plant No. 4
Thermal, CA · Riverside County · Publicly Owned Treatment Works
- Average flow
- 4.93 MGD
- Design flow
- 9.9 MGD
- NPDES permit
- CA0104973
- Effective
- Permit expires
- April 2028
- Population served
- —
- CWNS 2022
Water Reclamation Plant No. 4 is a publicly owned wastewater treatment works in Thermal, Riverside County, California treating an average of 4.93 million gallons per day against a permitted design capacity of 9.9 MGD. Treatment on site includes clarifiers, aerated lagoons, uncovered lagoons. It discharges under NPDES permit CA0104973 (effective), which expires in April 2028, with 11 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 11
- Effluent violations
- 11
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Water Reclamation Plant No. 4.
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Nearby wastewater treatment plants in California
Coachella · 4 mi away
—
Indio · 9 mi away
—
Niland · 43 mi away
0.92 MGD
Calipatria · 45 mi away
0.7 MGD
Westmorland · 47 mi away
0.2 MGD
Brawley · 53 mi away
—
Beaumont · 55 mi away
3.54 MGD
Seeley · 60 mi away
0.1 MGD
Water Reclamation Plant No. 4: 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 March 19, 2025.