Western Riverside Co Reg WWTP
Corona, CA · Riverside County · Publicly Owned Treatment Works
- Average flow
- 8.54 MGD
- Design flow
- 14 MGD
- NPDES permit
- CA8000316
- Expired
- Permit expires
- July 2020
- Population served
- 113,419
- CWNS 2022
Western Riverside Co Reg WWTP is a publicly owned wastewater treatment works in Corona, Riverside County, California treating an average of 8.54 million gallons per day against a permitted design capacity of 14 MGD, serving about 113,419 residents. Treatment on site includes clarifiers, carrousels / oxidation ditches, biogas silos. It discharges under NPDES permit CA8000316 (expired), which expires in July 2020, with 47 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
- 47
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Capital improvement projects in Corona
Corona's capital improvement plan lists 40 water, sewer and wastewater line items worth $240M starting 2026–2034. The largest budgeted items are shown here.
All water and sewer capital projects in Corona →
| Project | Budget | Years |
|---|---|---|
| Potable Waterline Replacement Project #3 | $36,000,000 | 2026–2035 |
| Potable Waterline Replacement Project #2 | $31,000,000 | 2026–2035 |
| Potable Waterline Replacement Project #1 | $26,000,000 | 2026–2035 |
| Water Reclamation Facility #1B Energy Efficiency | $23,000,000 | 2027–2027 |
| Grand Quad Waterline Replacement | $16,000,000 | 2033–2033 |
Full project details — scope, funding source, engineering consultant and the decision-makers behind each project — are available in Klarifi, along with similar wastewater capital projects in other cities.
Key contacts
2 verified contacts for Western Riverside Co Reg WWTP, with validated emails and direct phone numbers.
Unlock 2 verified contacts
Names, validated emails and direct phone numbers for decision-makers at Western Riverside Co Reg WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in California
Corona · 3 mi away
7.64 MGD
Chino · 5 mi away
6.4 MGD
Riverside · 9 mi away
27.72 MGD
Pomona · 14 mi away
—
Colton · 16 mi away
21.06 MGD
Colton · 18 mi away
—
San Bernardino · 21 mi away
—
Lake Elsinore · 22 mi away
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Western Riverside Co Reg WWTP: 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 May 10, 2025.