How much wastewater does Clarion, City Of STP treat?

Clarion, City Of STP treats an average of 0.82 MGD and is permitted for a design flow of 1.5 MGD.

What treatment technology does Clarion, City Of STP use?

Klarifi has identified aerated lagoons at the Clarion facility.

What is the NPDES permit for Clarion, City Of STP?

The facility discharges under NPDES permit IA0030945, currently effective, expiring January 2028.

Is Clarion, City Of STP in compliance?

Discharge monitoring reports show 13 violations at Clarion, City Of STP in the last three years, 13 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Clarion, City Of STP and how do I contact them?

Clarion, City Of STP is a publicly owned treatment works in Clarion, Iowa. Klarifi lists 1 verified decision-maker contact for this facility, available with a free trial.

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Clarion, City Of STP

Clarion, IA · Wright County · Publicly Owned Treatment Works

Average flow: 0.82 MGD

Design flow: 1.5 MGD

NPDES permit: IA0030945; Effective

Permit expires: January 2028

Population served: 2,979; CWNS 2022

Clarion, City Of STP is a publicly owned wastewater treatment works in Clarion, Wright County, Iowa treating an average of 0.82 million gallons per day against a permitted design capacity of 1.5 MGD, serving about 2,979 residents. Treatment on site includes aerated lagoons. It discharges under NPDES permit IA0030945 (effective), which expires in January 2028, with 13 recorded violations in the last three years.

Treatment technology

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

Aerated lagoons

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Compliance snapshot (last 3 years)

Total violations: 13

Effluent violations: 13

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

Key contacts

1 verified contact for Clarion, City Of STP, with validated emails and direct phone numbers.

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Names, validated emails and direct phone numbers for decision-makers at Clarion, City Of STP, plus the full compliance history and discharge data.

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Nearby wastewater treatment plants in Iowa

Lake Cornelia Sanitary District

Clarion · 5 mi away

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Renwick Stl

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Kanawha City Of STP

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Thor City Of STP

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Clarion, City Of STP: 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 7, 2025.

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