Simi Vly Cnty Sanitation
Simi Valley, CA · Ventura County · Publicly Owned Treatment Works
- Average flow
- 6.5 MGD
- Design flow
- 12.5 MGD
- NPDES permit
- CA0055221
- Effective
- Permit expires
- July 2031
- Population served
- 114,190
- CWNS 2022
Simi Vly Cnty Sanitation is a publicly owned wastewater treatment plant in Simi Valley, Ventura County, California treating an average of 6.5 million gallons per day against a permitted design capacity of 12.5 MGD, serving about 114,190 residents. Treatment on site includes clarifiers, covered lagoons, uncovered lagoons, biogas silos. It discharges under NPDES permit CA0055221 (effective), which expires in July 2031, with 37 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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Covered lagoons
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Uncovered lagoons
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Biogas silos
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Compliance snapshot (last 3 years)
- Total violations
- 37
- Effluent violations
- 37
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Capital improvement projects in Simi Valley
Simi Valley's capital improvement plan lists 77 water, sewer and wastewater line items worth $92M starting 2025–2029. The largest budgeted items are shown here.
All water and sewer capital projects in Simi Valley →
| Project | Budget | Years |
|---|---|---|
| SLR 8" to 12" Sewer Pipe Rehabilitation | $15,000,000 | 2027–2030 |
| MCC Replacement - Disinfection & Filters | $4,620,000 | 2027–2029 |
| Primary Clarifier Rehabilitation | $3,780,000 | 2025–2028 |
| Plant Water System Pump Replacement | $3,600,000 | 2025–2026 |
| Filter Equipment Replacement | $3,250,000 | 2028–2030 |
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
5 verified contacts for Simi Vly Cnty Sanitation, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Simi Vly Cnty Sanitation, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in California
Camarillo · 8 mi away
8.09 MGD
Camarillo · 12 mi away
3.57 MGD
Camarillo · 16 mi away
—
Valencia · 16 mi away
14.1 MGD
Malibu · 18 mi away
—
Saugus · 18 mi away
4.3 MGD
Van Nuys · 20 mi away
19 MGD
Oxnard · 23 mi away
16.6 MGD
Simi Vly Cnty Sanitation: 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.