How much wastewater does Earlham City Of STP treat?

Earlham City Of STP treats an average of 0.34 MGD and is permitted for a design flow of 3.5 MGD.

What treatment technology does Earlham City Of STP use?

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

What is the NPDES permit for Earlham City Of STP?

The facility discharges under NPDES permit IA0027421, currently effective, expiring October 2029.

Is Earlham City Of STP in compliance?

Discharge monitoring reports show 46 violations at Earlham City Of STP in the last three years, 29 of them effluent limit exceedances. The full history is available in Klarifi.

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

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

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Earlham City Of STP

Earlham, IA 50072 · Madison County · Publicly Owned Treatment Works

Average flow: 0.34 MGD

Design flow: 3.5 MGD

NPDES permit: IA0027421; Effective

Permit expires: October 2029

Population served: 1,417; CWNS 2022

Earlham City Of STP is a publicly owned wastewater treatment works in Earlham, Madison County, Iowa treating an average of 0.34 million gallons per day against a permitted design capacity of 3.5 MGD, serving about 1,417 residents. It discharges under NPDES permit IA0027421 (effective), which expires in October 2029, with 46 recorded violations in the last three years.

Treatment technology

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

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 46

Effluent violations: 29

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

Key contacts

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

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Nearby wastewater treatment plants in Iowa

Dexter City Of STP

Dexter · 6 mi away

—

Desoto City Of STP

De Soto · 6 mi away

0.13 MGD

Redfield WWTP

Redfield · 7 mi away

0.07 MGD

Van Meter City Of STP

Van Meter · 9 mi away

0.08 MGD

Adel WWTP

Adel · 9 mi away

0.77 MGD

Stuart WWTP

Stuart · 10 mi away

0.41 MGD

Linden City Of STP

Linden · 13 mi away

—

Winterset City Of STP

Winterset · 14 mi away

1.16 MGD

Earlham 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 18, 2026.

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

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