How much wastewater does Defiance City Of STP treat?

Defiance City Of STP is permitted for a design flow of 0.12 MGD. Its average daily flow is not available in the current EPA data.

What treatment technology does Defiance City Of STP use?

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

What is the NPDES permit for Defiance City Of STP?

The facility discharges under NPDES permit IA0042862, currently effective, expiring June 2028.

Is Defiance City Of STP in compliance?

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

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

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

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Defiance City Of STP

Defiance, IA 51527 · Shelby County · Publicly Owned Treatment Works

Average flow: —

Design flow: 0.12 MGD

NPDES permit: IA0042862; Effective

Permit expires: June 2028

Population served: 245; CWNS 2022

Defiance City Of STP is a publicly owned wastewater treatment works in Defiance, Shelby County, Iowa, serving about 245 residents. It discharges under NPDES permit IA0042862 (effective), which expires in June 2028, with 5 recorded violations in the last three years.

Treatment technology

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

Available with a free Klarifi account

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

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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

1 verified contact for Defiance City Of STP, with validated emails and direct phone numbers.

Unlock 1 verified contact

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

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Nearby wastewater treatment plants in Iowa

Manilla WWTP

Manilla · 6 mi away

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Irwin City Of STP

Irwin · 6 mi away

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Earling City Of STP

Earling · 7 mi away

0.04 MGD

Dow City, City Of STP

Dow City · 11 mi away

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Denison Municipal Utilities WWTP

Denison · 13 mi away

0.84 MGD

Harlan City Of STP

Harlan · 13 mi away

0.62 MGD

Dunlap WWTP

Dunlap · 14 mi away

0.14 MGD

Manning WWTP

Manning · 15 mi away

0.12 MGD

Defiance 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 August 4, 2026.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Significant industrial user · WWTP · all terms

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