Orange County Sanitation District Plant 1
Fountain Valley, CA · Orange County · Publicly Owned Treatment Works
- Average flow
- 77.37 MGD
- Design flow
- 332 MGD
- NPDES permit
- CA0110604
- Administratively continued
- Permit expires
- July 2026
- Population served
- —
- CWNS 2022
Orange County Sanitation District Plant 1 is a publicly owned wastewater treatment plant in Fountain Valley, Orange County, California treating an average of 77.37 million gallons per day against a permitted design capacity of 332 MGD. Treatment on site includes clarifiers. It discharges under NPDES permit CA0110604 (administratively continued), which expires in July 2026, with 0 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
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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.
Capital improvement projects in Fountain Valley
Fountain Valley's capital improvement plan lists 15 water, sewer and wastewater line items worth $28M starting 2024–2027. The largest budgeted items are shown here.
All water and sewer capital projects in Fountain Valley →
| Project | Budget | Years |
|---|---|---|
| Pipeline Replacement | $11,250,000 | 2024–2029 |
| Structural Improvements | $7,500,000 | 2024–2029 |
| Annual Meter Replacement | $6,000,000 | 2025–2029 |
| Water Conservation | $500,000 | 2024–2029 |
| AMI Software/License Fees | $464,815 | 2024–2029 |
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
13 verified contacts for Orange County Sanitation District Plant 1, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Orange County Sanitation District Plant 1, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in California
Irvine · 6 mi away
6.99 MGD
Long Beach · 11 mi away
4.44 MGD
Cerritos · 16 mi away
—
San Pedro · 19 mi away
9.8 MGD
Carson · 21 mi away
162.85 MGD
Dana Point · 21 mi away
11.47 MGD
Corona · 24 mi away
7.64 MGD
Whittier · 24 mi away
28.38 MGD
Orange County Sanitation District Plant 1: 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 February 27, 2025.