How much wastewater does Northwest WWTF treat?

Northwest WWTF treats an average of 0.32 MGD and is permitted for a design flow of 3 MGD.

What treatment technology does Northwest WWTF use?

Klarifi has identified uncovered lagoons at the Rio Vista facility.

What is the NPDES permit for Northwest WWTF?

The facility discharges under NPDES permit CA0083771, currently effective, expiring May 2030.

Is Northwest WWTF in compliance?

Discharge monitoring reports show 7 violations at Northwest WWTF in the last three years, 3 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Northwest WWTF and how do I contact them?

Northwest WWTF is a publicly owned treatment works in Rio Vista, California. Klarifi lists decision-maker contacts for this facility, available with a free trial.

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Northwest WWTF

Rio Vista, CA · Solano County · Publicly Owned Treatment Works

Average flow: 0.32 MGD

Design flow: 3 MGD

NPDES permit: CA0083771; Effective

Permit expires: May 2030

Population served: —; CWNS 2022

Northwest WWTF is a publicly owned wastewater treatment works in Rio Vista, Solano County, California treating an average of 0.32 million gallons per day against a permitted design capacity of 3 MGD. Treatment on site includes uncovered lagoons. It discharges under NPDES permit CA0083771 (effective), which expires in May 2030, with 7 recorded violations in the last three years.

Treatment technology

Treatment structures identified at this facility. Exact unit counts are available in Klarifi.

Uncovered lagoons

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Compliance snapshot (last 3 years)

Total violations: 7

Effluent violations: 3

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

Key contacts

Decision-makers at Northwest WWTF.

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Nearby wastewater treatment plants in California

Rio Vista WWTF

Rio Vista · 3 mi away

0.5 MGD

Ironhouse Sd WWTP

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2.71 MGD

Contra Costa Co San Dist 7a

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Brentwood Wastewater Treatment Plant

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White Slough WPCF

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Discovery Bay WWTP

Discovery Bay · 21 mi away

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Sacramento County Wastewater Treatment Plant

Elk Grove · 22 mi away

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Uc Davis WWTP

Davis · 23 mi away

1.47 MGD

Northwest 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 August 18, 2026.

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