How much wastewater does Sumner City Of STP treat?

Sumner City Of STP treats an average of 0.29 MGD and is permitted for a design flow of 1.63 MGD.

What treatment technology does Sumner City Of STP use?

Klarifi has identified 2 treatment structures and unit processes at the Sumner facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

What is the NPDES permit for Sumner City Of STP?

The facility discharges under NPDES permit IA0033766, currently effective, expiring December 2027.

Is Sumner City Of STP in compliance?

Discharge monitoring reports show 1 violation at Sumner City Of STP in the last three years, 1 of them effluent limit exceedances. The full history is available in Klarifi.

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

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

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Sumner City Of STP

Sumner, IA 50674 · Bremer County · Publicly Owned Treatment Works

Average flow: 0.29 MGD

Design flow: 1.63 MGD

NPDES permit: IA0033766; Effective

Permit expires: December 2027

Population served: 2,172; CWNS 2022

Sumner City Of STP is a publicly owned wastewater treatment works in Sumner, Bremer County, Iowa treating an average of 0.29 million gallons per day against a permitted design capacity of 1.63 MGD, serving about 2,172 residents. It discharges under NPDES permit IA0033766 (effective), which expires in December 2027, with 1 recorded violation in the last three years.

Treatment technology

2 treatment structures and unit processes identified at Sumner City Of STP.

Available with a free Klarifi account

See the full treatment train at Sumner City Of STP: structures, unit processes and planned upgrades, with exact unit counts.

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Compliance snapshot (last 3 years)

Total violations: 1

Effluent violations: 1

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

Key contacts

1 verified contact for Sumner 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 Sumner City Of STP, plus the full compliance history and discharge data.

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Nearby wastewater treatment plants in Iowa

Westgate, City Of-STP

Westgate · 7 mi away

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Tripoli City Of STP

Tripoli · 8 mi away

0.26 MGD

Oran Community Sanitation District

Oran · 10 mi away

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Hawkeye City Of STP

Hawkeye · 10 mi away

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Frederika City Of STP

Frederika · 10 mi away

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Fredricksburg WWTP

Fredericksburg · 11 mi away

1.7 MGD

Maynard City Of STP

Maynard · 11 mi away

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Readlyn WWTP

Readlyn · 12 mi away

0.12 MGD

Sumner 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 October 26, 2026; facility record last updated March 28, 2025.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · FOG · Equalization tank · all terms

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