How much wastewater does Iowa City, City Of (south) STP treat?

Iowa City, City Of (south) STP is permitted for a design flow of 43.3 MGD. Its average daily flow is not available in the current EPA data.

What is the NPDES permit for Iowa City, City Of (south) STP?

The facility discharges under NPDES permit IA0070866, currently effective, expiring July 2030.

Is Iowa City, City Of (south) STP in compliance?

Discharge monitoring reports show 11 violations at Iowa City, City Of (south) STP in the last three years, 11 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Iowa City, City Of (south) STP and how do I contact them?

Iowa City, City Of (south) STP is a publicly owned treatment works in Iowa City, Iowa. Klarifi lists 26 verified decision-maker contacts for this facility, available with a free trial.

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Iowa City, City Of (south) STP

Q: What treatment technology does Iowa City, City Of (south) STP use?

Klarifi has identified clarifiers, uncovered lagoons, biogas silos, biogas balloons at the Iowa City facility.

Iowa City, IA · Johnson County · Publicly Owned Treatment Works

Average flow: —

Design flow: 43.3 MGD

NPDES permit: IA0070866; Effective

Permit expires: July 2030

Population served: 22,457; CWNS 2022

Iowa City, City Of (south) STP is a publicly owned wastewater treatment works in Iowa City, Johnson County, Iowa, serving about 22,457 residents. Treatment on site includes clarifiers, uncovered lagoons, biogas silos, biogas balloons. It discharges under NPDES permit IA0070866 (effective), which expires in July 2030, with 11 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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Uncovered lagoons

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Biogas silos

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Biogas balloons

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Compliance snapshot (last 3 years)

Total violations: 11

Effluent violations: 11

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

Key contacts

26 verified contacts for Iowa City, City Of (south) STP, with validated emails and direct phone numbers.

Unlock 26 verified contacts (23 more than shown)

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

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West Liberty City Of STP

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Nichols City Of STP

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Iowa City, City Of (south) 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 March 28, 2025.

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