How much wastewater does City Of Sonora treat?

City Of Sonora treats an average of 0.64 MGD and is permitted for a design flow of 0.88 MGD.

What treatment technology does City Of Sonora use?

Klarifi has identified clarifiers, carrousels / oxidation ditches at the Sonora facility.

What is the NPDES permit for City Of Sonora?

The facility discharges under NPDES permit TX0023191, currently effective, expiring August 2028.

Is City Of Sonora in compliance?

Discharge monitoring reports show 8 violations at City Of Sonora in the last three years, 6 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates City Of Sonora and how do I contact them?

City Of Sonora is a publicly owned treatment works in Sonora, Texas. Klarifi lists decision-maker contacts for this facility, available with a free trial.

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City Of Sonora

Sonora, TX · Sutton County · Publicly Owned Treatment Works

Average flow: 0.64 MGD

Design flow: 0.88 MGD

NPDES permit: TX0023191; Effective

Permit expires: August 2028

Population served: 3,554; CWNS 2022

City Of Sonora is a publicly owned wastewater treatment plant in Sonora, Sutton County, Texas treating an average of 0.64 million gallons per day against a permitted design capacity of 0.88 MGD, serving about 3,554 residents. Treatment on site includes clarifiers, carrousels / oxidation ditches. It discharges under NPDES permit TX0023191 (effective), which expires in August 2028, with 8 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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Carrousels / oxidation ditches

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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.

Key contacts

Decision-makers at City Of Sonora.

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City Of Sonora: 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 May 28, 2025.

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