How much wastewater does Sibley City Of STP treat?

Sibley City Of STP treats an average of 0.33 MGD and is permitted for a design flow of 1.1 MGD.

What treatment technology does Sibley City Of STP use?

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

What is the NPDES permit for Sibley City Of STP?

The facility discharges under NPDES permit IA0032841, currently effective, expiring September 2030.

Is Sibley City Of STP in compliance?

Discharge monitoring reports show 12 violations at Sibley City Of STP in the last three years, 2 of them effluent limit exceedances. The full history is available in Klarifi.

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

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

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Sibley City Of STP

Sibley, IA 51249 · Osceola County · Publicly Owned Treatment Works

Average flow: 0.33 MGD

Design flow: 1.1 MGD

NPDES permit: IA0032841; Effective

Permit expires: September 2030

Population served: 2,942; CWNS 2022

Sibley City Of STP is a publicly owned wastewater treatment works in Sibley, Osceola County, Iowa treating an average of 0.33 million gallons per day against a permitted design capacity of 1.1 MGD, serving about 2,942 residents. It discharges under NPDES permit IA0032841 (effective), which expires in September 2030, with 12 recorded violations in the last three years.

Treatment technology

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

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 12

Effluent violations: 2

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

Key contacts

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

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Nearby wastewater treatment plants in Iowa

Ashton City Of STP

Ashton · 5 mi away

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Little Rock City Of STP

Little Rock · 9 mi away

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Melvin City Of STP

Melvin · 10 mi away

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Ocheyedan City Of STP

Ocheyedan · 11 mi away

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George City Of STP

George · 14 mi away

0.08 MGD

Sanborn WWTP

Sanborn · 14 mi away

0.6 MGD

Sheldon Wastewater Plant

Sheldon · 14 mi away

0.9 MGD

Harris City Of STP

Harris · 16 mi away

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Sibley 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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