How much wastewater does Osage City Of STP treat?

Osage City Of STP treats an average of 0.41 MGD and is permitted for a design flow of 1.69 MGD.

What treatment technology does Osage City Of STP use?

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

What is the NPDES permit for Osage City Of STP?

The facility discharges under NPDES permit IA0032956, currently effective, expiring January 2030.

Is Osage City Of STP in compliance?

Discharge monitoring reports show 54 violations at Osage City Of STP in the last three years, 50 of them effluent limit exceedances. The full history is available in Klarifi.

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

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

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Osage City Of STP

Osage, IA 50461 · Mitchell County · Publicly Owned Treatment Works

Average flow: 0.41 MGD

Design flow: 1.69 MGD

NPDES permit: IA0032956; Effective

Permit expires: January 2030

Population served: 3,710; CWNS 2022

Osage City Of STP is a publicly owned wastewater treatment works in Osage, Mitchell County, Iowa treating an average of 0.41 million gallons per day against a permitted design capacity of 1.69 MGD, serving about 3,710 residents. It discharges under NPDES permit IA0032956 (effective), which expires in January 2030, with 54 recorded violations in the last three years.

Treatment technology

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

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 54

Effluent violations: 50

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

Key contacts

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

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Nearby wastewater treatment plants in Iowa

Mitchell County WW Pretreatment Plant

Osage · 1 mi away

0.03 MGD

Orchard City Of STP

Orchard · 5 mi away

—

Saint Ansgar WWTP

St. Ansgar · 8 mi away

0.1 MGD

Stacyville, City Of STP

Stacyville · 10 mi away

—

Rudd WWTP

Rudd · 11 mi away

—

Floyd City Of STP

Floyd · 11 mi away

0.03 MGD

Grafton City Of STP

Grafton · 13 mi away

—

Nora Springs City Of STP

Nora Springs · 13 mi away

0.13 MGD

Osage 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 6, 2025.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Biosolids · Filter press · all terms

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