How much wastewater does Winthrop City Of STP treat?

Winthrop City Of STP treats an average of 0.23 MGD and is permitted for a design flow of 1.15 MGD.

What treatment technology does Winthrop City Of STP use?

Klarifi has identified one treatment structure or unit process at the Winthrop facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

What is the NPDES permit for Winthrop City Of STP?

The facility discharges under NPDES permit IA0032808, currently effective, expiring January 2031.

Is Winthrop City Of STP in compliance?

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

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

Winthrop City Of STP is a publicly owned treatment works in Winthrop, Iowa. Klarifi lists 2 verified decision-maker contacts for this facility, available with a free trial.

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Winthrop City Of STP

Winthrop, IA 50682 · Buchanan County · Publicly Owned Treatment Works

Average flow: 0.23 MGD

Design flow: 1.15 MGD

NPDES permit: IA0032808; Effective

Permit expires: January 2031

Population served: 888; CWNS 2022

Winthrop City Of STP is a publicly owned wastewater treatment works in Winthrop, Buchanan County, Iowa treating an average of 0.23 million gallons per day against a permitted design capacity of 1.15 MGD, serving about 888 residents. It discharges under NPDES permit IA0032808 (effective), which expires in January 2031, with 1 recorded violation in the last three years.

Treatment technology

One treatment structure or unit process identified at Winthrop City Of STP.

Available with a free Klarifi account

See the full treatment train at Winthrop 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

2 verified contacts for Winthrop 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 Winthrop City Of STP, plus the full compliance history and discharge data.

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Nearby wastewater treatment plants in Iowa

Quasqueton City Of STP

Quasqueton · 5 mi away

0.03 MGD

Independence WWTP

Independence · 7 mi away

1.31 MGD

Masonville, City Of-STP

Masonville · 8 mi away

—

Rowley City Of STP

Rowley · 8 mi away

—

Aurora City Of STP

Aurora · 10 mi away

—

Lamont WWTF

Lamont · 11 mi away

—

Dundee City Of STP

Dundee · 13 mi away

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Troy Mills Sanitary District

Walker · 13 mi away

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Winthrop 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 · Tertiary treatment · Significant industrial user · all terms

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