San Elijo WPCF
Cardiff, CA · San Diego County · Publicly Owned Treatment Works
- Average flow
- 1.06 MGD
- Design flow
- 5.25 MGD
- NPDES permit
- CA0107999
- Expired
- Permit expires
- May 2023
- Population served
- 20,479
- CWNS 2022
San Elijo WPCF is a publicly owned wastewater treatment works in Cardiff, San Diego County, California treating an average of 1.06 million gallons per day against a permitted design capacity of 5.25 MGD, serving about 20,479 residents. Treatment on site includes clarifiers, biogas silos. It discharges under NPDES permit CA0107999 (expired), which expires in May 2023, with 0 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
- 0
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
2 verified contacts for San Elijo WPCF, with validated emails and direct phone numbers.
Unlock 2 verified contacts
Names, validated emails and direct phone numbers for decision-makers at San Elijo WPCF, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in California
Carlsbad · 7 mi away
23.78 MGD
Escondido · 11 mi away
7.8 MGD
Oceanside · 13 mi away
10.7 MGD
Santee · 18 mi away
—
San Diego · 23 mi away
137 MGD
Fallbrook · 24 mi away
1.07 MGD
San Diego · 35 mi away
29 MGD
Dana Point · 39 mi away
11.47 MGD
San Elijo WPCF: 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 27, 2025.