San Luis Obispo WWTP
San Luis Obispo, CA · San Luis Obispo County · Publicly Owned Treatment Works
- Average flow
- 4.23 MGD
- Design flow
- —
- NPDES permit
- CAL049224
- Effective
- Permit expires
- December 2030
- Population served
- 40,960
- CWNS 2022
San Luis Obispo WWTP is a publicly owned wastewater treatment works in San Luis Obispo, San Luis Obispo County, California treating an average of 4.23 million gallons per day, serving about 40,960 residents. Treatment on site includes clarifiers, uncovered lagoons, biogas silos. It discharges under NPDES permit CAL049224 (effective), which expires in December 2030, with 23 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
- 23
- Effluent violations
- 20
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Capital improvement projects in San Luis Obispo
San Luis Obispo's capital improvement plan lists 115 water, sewer and wastewater line items worth $170M starting 2025–2034. The largest budgeted items are shown here.
All water and sewer capital projects in San Luis Obispo →
| Project | Budget | Years |
|---|---|---|
| Water - Pipeline Replacement | $36,980,000 | 2030–2035 |
| Sewer - Pipeline Replacement | $23,148,000 | 2030–2035 |
| Water - Major Maintenance | $22,236,000 | 2030–2035 |
| T-3 Water Storage Tank Replacement - High Pressure Zone | $9,750,000 | 2026–2030 |
| Waterline Replacement: Santa Rosa - Stenner Creek Road to Highland 30-inch | $9,230,000 | 2027–2028 |
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
3 verified contacts for San Luis Obispo WWTP, with validated emails and direct phone numbers.
Unlock 3 verified contacts
Names, validated emails and direct phone numbers for decision-makers at San Luis Obispo WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in California
San Luis Obispo · 5 mi away
—
Avila Beach · 6 mi away
0.07 MGD
Pismo Beach · 8 mi away
0.93 MGD
Oceano · 11 mi away
—
Morro Bay · 12 mi away
2.74 MGD
Morro Bay · 16 mi away
0.19 MGD
Paso Robles · 27 mi away
2.27 MGD
Paso Robles · 34 mi away
—
San Luis Obispo 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 September 10, 2025.