How much wastewater does Oyens City Of STP treat?

Oyens City Of STP is permitted for a design flow of 0.02 MGD. Its average daily flow is not available in the current EPA data.

What treatment technology does Oyens City Of STP use?

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

What is the NPDES permit for Oyens City Of STP?

The facility discharges under NPDES permit IA0032336, currently effective, expiring June 2028.

Is Oyens City Of STP in compliance?

Discharge monitoring reports show 4 violations at Oyens City Of STP in the last three years, 4 of them effluent limit exceedances. The full history is available in Klarifi.

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

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

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Oyens City Of STP

Oyens, IA 51045 · Plymouth County · Publicly Owned Treatment Works

Average flow: —

Design flow: 0.02 MGD

NPDES permit: IA0032336; Effective

Permit expires: June 2028

Population served: 92; CWNS 2022

Oyens City Of STP is a publicly owned wastewater treatment works in Oyens, Plymouth County, Iowa, serving about 92 residents. It discharges under NPDES permit IA0032336 (effective), which expires in June 2028, with 4 recorded violations in the last three years.

Treatment technology

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

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 4

Effluent violations: 4

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

Key contacts

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

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Nearby wastewater treatment plants in Iowa

Remsen City Of STP

Remsen · 5 mi away

0.2 MGD

Le Mars City Of STP

Le Mars · 8 mi away

—

Brunsville City Of STP

Brunsville · 10 mi away

—

Merrill City Of STP

Merrill · 11 mi away

0.04 MGD

Marcus WWTP

Marcus · 12 mi away

0.16 MGD

Maurice City Of STP

Maurice · 12 mi away

—

Orange City City Of STP

Orange City · 12 mi away

0.85 MGD

Granville City Of STP

Granville · 15 mi away

—

Oyens 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 11, 2025.

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

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