What is the address of Oskaloosa SW STP?

The address on the plant’s EPA facility record is 2632 Kent Avenue, Oskaloosa, IA 52577, in Mahaska County. Its coordinates are 41.2702, -92.6594. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Oskaloosa SW STP treat?

Oskaloosa SW STP treats an average of 0.71 MGD and is permitted for a design flow of 3 MGD.

What treatment technology does Oskaloosa SW STP use?

Klarifi has identified 4 treatment structures and unit processes at the Oskaloosa facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

What is the NPDES permit for Oskaloosa SW STP?

The facility discharges under NPDES permit IA0038521, currently administratively continued, expiring March 2026.

Is Oskaloosa SW STP in compliance?

Discharge monitoring reports show 5 violations at Oskaloosa SW STP in the last three years, 5 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Oskaloosa SW STP and how do I contact them?

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

Try for free Log in

Oskaloosa SW STP

2632 Kent Avenue, Oskaloosa, IA 52577 · Mahaska County · Publicly Owned Treatment Works

Average flow: 0.71 MGD

Design flow: 3 MGD

NPDES permit: IA0038521; Administratively continued

Permit expires: March 2026

Population served: 6,373; CWNS 2022

Oskaloosa SW STP is a publicly owned wastewater treatment works in Oskaloosa, Mahaska County, Iowa treating an average of 0.71 million gallons per day against a permitted design capacity of 3 MGD, serving about 6,373 residents. It discharges under NPDES permit IA0038521 (administratively continued), which expires in March 2026, with 5 recorded violations in the last three years.

Treatment technology

4 treatment structures and unit processes identified at Oskaloosa SW STP.

Available with a free Klarifi account

See the full treatment train at Oskaloosa SW STP: structures, unit processes and planned upgrades, with exact unit counts.

Create a free account

Compliance snapshot (last 3 years)

Total violations: 5

Effluent violations: 5

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

Key contacts

2 verified contacts for Oskaloosa SW STP, with validated emails and direct phone numbers.

Unlock 2 verified contacts

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

Try Klarifi free

Nearby wastewater treatment plants in Iowa

Beacon City Of STP

Beacon · 1 mi away

0.03 MGD

University Park City Of STP

University Park · 3 mi away

—

Oskaloosa NE WWTP

Oskaloosa · 4 mi away

0.69 MGD

Keomah Village City Of STP

Oskaloosa · 7 mi away

—

Leighton City Of STP

Leighton · 9 mi away

—

Eddyville, City Of STP

Eddyville · 9 mi away

—

Rose Hill City Of STP

Rose Hill · 10 mi away

—

Fremont City Of STP

Fremont · 12 mi away

—

Oskaloosa SW 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 16, 2025.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Centrate · Ozonation · all terms

Try Klarifi for free

Create your own trial account and explore how Klarifi can help you.

Try for free