What is the address of Soscol WRF?

The address on the plant’s EPA facility record is 1515 Soscol Ferry Rd, Napa, CA 94558, in Napa County. Its coordinates are 38.2276, -122.2887. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Soscol WRF treat?

Soscol WRF is permitted for a design flow of 23 MGD. Its average daily flow is not available in the current EPA data.

What treatment technology does Soscol WRF use?

Klarifi has identified 4 treatment structures and unit processes at the Napa facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

What is the NPDES permit for Soscol WRF?

The facility discharges under NPDES permit CA0037575, currently effective, expiring March 2027.

Is Soscol WRF in compliance?

Discharge monitoring reports show 12 violations at Soscol WRF in the last three years, 7 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Soscol WRF and how do I contact them?

Soscol WRF is a publicly owned treatment works in Napa, California. Klarifi lists 7 verified decision-maker contacts for this facility, available with a free trial.

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Soscol WRF

1515 Soscol Ferry Rd, Napa, CA 94558 · Napa County · Publicly Owned Treatment Works

Average flow: —

Design flow: 23 MGD

NPDES permit: CA0037575; Effective

Permit expires: March 2027

Population served: 74,970; CWNS 2022

Soscol WRF is a publicly owned wastewater treatment works in Napa, Napa County, California, serving about 74,970 residents. It discharges under NPDES permit CA0037575 (effective), which expires in March 2027, with 12 recorded violations in the last three years.

Treatment technology

4 treatment structures and unit processes identified at Soscol WRF.

Available with a free Klarifi account

See the full treatment train at Soscol WRF: structures, unit processes and planned upgrades, with exact unit counts.

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Compliance snapshot (last 3 years)

Total violations: 12

Effluent violations: 7

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

Key contacts

7 verified contacts for Soscol WRF, with validated emails and direct phone numbers.

Unlock 7 verified contacts (4 more than shown)

Names, validated emails and direct phone numbers for decision-makers at Soscol WRF, plus the full compliance history and discharge data.

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Soscol WRF: 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 October 26, 2026; facility record last updated September 25, 2026.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Lift station · Sludge dewatering · all terms

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