What is the address of Dunaweal WWTP?

The address on the plant’s EPA facility record is 1185 Dunaweal Lane, Calistoga, CA 94515, in Napa County. Its coordinates are 38.5708, -122.5576. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Dunaweal WWTP treat?

Dunaweal WWTP is permitted for a design flow of 4 MGD. Its average daily flow is not available in the current EPA data.

What treatment technology does Dunaweal WWTP use?

Klarifi has identified 3 treatment structures and unit processes at the Calistoga facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

What is the NPDES permit for Dunaweal WWTP?

The facility discharges under NPDES permit CA0037966, currently effective, expiring April 2027.

Is Dunaweal WWTP in compliance?

Discharge monitoring reports show 26 violations at Dunaweal WWTP in the last three years, 11 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Dunaweal WWTP and how do I contact them?

Dunaweal WWTP is a publicly owned treatment works in Calistoga, California. Klarifi lists decision-maker contacts for this facility, available with a free trial.

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Dunaweal WWTP

1185 Dunaweal Lane, Calistoga, CA 94515 · Napa County · Publicly Owned Treatment Works

Average flow: —

Design flow: 4 MGD

NPDES permit: CA0037966; Effective

Permit expires: April 2027

Population served: 4,981; CWNS 2022

Dunaweal WWTP is a publicly owned wastewater treatment works in Calistoga, Napa County, California, serving about 4,981 residents. It discharges under NPDES permit CA0037966 (effective), which expires in April 2027, with 26 recorded violations in the last three years.

Treatment technology

3 treatment structures and unit processes identified at Dunaweal WWTP.

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 26

Effluent violations: 11

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

Key contacts

Decision-makers at Dunaweal WWTP.

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Dunaweal WWTP: 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 July 29, 2026.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · WWTP · Biosolids · all terms

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