How much wastewater does Sunnyvale Water Pollution Control Plant treat?

Sunnyvale Water Pollution Control Plant is permitted for a design flow of 40 MGD. Its average daily flow is not available in the current EPA data.

What treatment technology does Sunnyvale Water Pollution Control Plant use?

Klarifi has identified clarifiers, biogas silos at the Sunnyvale facility.

What is the NPDES permit for Sunnyvale Water Pollution Control Plant?

The facility discharges under NPDES permit CA0037621, currently expired, expiring March 2025.

Is Sunnyvale Water Pollution Control Plant in compliance?

Discharge monitoring reports show 22 violations at Sunnyvale Water Pollution Control Plant in the last three years, 22 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Sunnyvale Water Pollution Control Plant and how do I contact them?

Sunnyvale Water Pollution Control Plant is a publicly owned treatment works in Sunnyvale, California. Klarifi lists 2 verified decision-maker contacts for this facility, available with a free trial.

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Sunnyvale Water Pollution Control Plant

Sunnyvale, CA · Santa Clara County · Publicly Owned Treatment Works

Average flow: —

Design flow: 40 MGD

NPDES permit: CA0037621; Expired

Permit expires: March 2025

Population served: 138,290; CWNS 2022

Sunnyvale Water Pollution Control Plant is a publicly owned wastewater treatment works in Sunnyvale, Santa Clara County, California, serving about 138,290 residents. Treatment on site includes clarifiers, biogas silos. It discharges under NPDES permit CA0037621 (expired), which expires in March 2025, with 22 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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Biogas silos

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Compliance snapshot (last 3 years)

Total violations: 22

Effluent violations: 22

Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.

Key contacts

2 verified contacts for Sunnyvale Water Pollution Control Plant, with validated emails and direct phone numbers.

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Names, validated emails and direct phone numbers for decision-makers at Sunnyvale Water Pollution Control Plant, plus the full compliance history and discharge data.

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Sunnyvale Water Pollution Control Plant: 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 July 29, 2026.

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