Watsonville WWTF
Watsonville, CA · Santa Cruz County · Publicly Owned Treatment Works
- Average flow
- 5.21 MGD
- Design flow
- 36 MGD
- NPDES permit
- CA0048216
- Expired
- Permit expires
- July 2019
- Population served
- 58,713
- CWNS 2022
Watsonville WWTF is a publicly owned wastewater treatment works in Watsonville, Santa Cruz County, California treating an average of 5.21 million gallons per day against a permitted design capacity of 36 MGD, serving about 58,713 residents. Treatment on site includes clarifiers, biogas silos, biogas balloons. It discharges under NPDES permit CA0048216 (expired), which expires in July 2019, with 8 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
- 8
- Effluent violations
- 6
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Capital improvement projects in Watsonville
Watsonville's capital improvement plan lists 30 water, sewer and wastewater line items worth $154M starting 2025–2029. The largest budgeted items are shown here.
All water and sewer capital projects in Watsonville →
| Project | Budget | Years |
|---|---|---|
| Chromium 6 Treatment Plants | $47,000,000 | 2025–2029 |
| Replace Headworks Diversion | $37,000,000 | 2026–2030 |
| RW Switchgear, Standby Generator | $17,338,000 | 2027–2030 |
| Main Switchgear and Energy Recovery Electrical System Improvements | $13,000,000 | 2025–2027 |
| Water Main Replacement Material and Equipment Costs | $7,500,000 | 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
3 verified contacts for Watsonville WWTF, with validated emails and direct phone numbers.
Unlock 3 verified contacts
Names, validated emails and direct phone numbers for decision-makers at Watsonville WWTF, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in California
Marina · 13 mi away
—
Gilroy · 15 mi away
—
Scotts Valley · 17 mi away
0.42 MGD
Carmel · 25 mi away
—
Sunnyvale · 39 mi away
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Union City · 51 mi away
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Half Moon Bay · 54 mi away
—
San Mateo · 55 mi away
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Watsonville WWTF: 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 6, 2025.