Cayucos Sanitary District WRRF
Morro Bay, CA · San Luis Obispo County · Publicly Owned Treatment Works
- Average flow
- 0.19 MGD
- Design flow
- 0.34 MGD
- NPDES permit
- CA3000001
- Expired
- Permit expires
- November 2025
- Population served
- —
- CWNS 2022
Cayucos Sanitary District WRRF is a publicly owned wastewater treatment plant in Morro Bay, San Luis Obispo County, California treating an average of 0.19 million gallons per day against a permitted design capacity of 0.34 MGD. Treatment on site includes aerated lagoons, uncovered lagoons. It discharges under NPDES permit CA3000001 (expired), which expires in November 2025, 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.
Capital improvement projects in Morro Bay
Morro Bay's capital improvement plan lists 8 water, sewer and wastewater line items worth $29M starting 2023–2026. The largest budgeted items are shown here.
All water and sewer capital projects in Morro Bay →
| Project | Budget | Years |
|---|---|---|
| Wastewater Treatment Plant Decomissioning | $9,207,500 | 2023–2027 |
| Nutmeg Tank and related Pressure Zone Improvements | $9,163,479 | 2025–2027 |
| Morro Basin Wellfield Rehabilitation | $3,484,900 | 2024–2027 |
| Beachcomber Drive Area Backyard Sewer Improvements - Design | $3,200,000 | 2023–2029 |
| Water Meter Replacement | $2,500,000 | 2025–2030 |
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
Decision-makers at Cayucos Sanitary District WRRF.
No verified contacts on file yet
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Nearby wastewater treatment plants in California
Morro Bay · 4 mi away
2.74 MGD
San Luis Obispo · 12 mi away
—
San Luis Obispo · 16 mi away
4.23 MGD
Avila Beach · 18 mi away
0.07 MGD
Paso Robles · 19 mi away
2.27 MGD
Paso Robles · 21 mi away
—
Pismo Beach · 23 mi away
0.93 MGD
Oceano · 26 mi away
—
Cayucos Sanitary District WRRF: 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 November 29, 2025.