What is the address of Underwood City Of STP?

The address on the plant’s EPA facility record is 218 2nd Street - PO Box 40, Underwood, IA 51576, in Pottawattamie County. Its coordinates are 41.3784, -95.6821. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Underwood City Of STP treat?

Underwood City Of STP treats an average of 0.08 MGD and is permitted for a design flow of 0.19 MGD.

What treatment technology does Underwood City Of STP use?

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

What is the NPDES permit for Underwood City Of STP?

The facility discharges under NPDES permit IA0036986, currently effective, expiring November 2029.

Is Underwood City Of STP in compliance?

Discharge monitoring reports show 25 violations at Underwood City Of STP in the last three years, 25 of them effluent limit exceedances. The full history is available in Klarifi.

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

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

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Underwood City Of STP

218 2nd Street - PO Box 40, Underwood, IA 51576 · Pottawattamie County · Publicly Owned Treatment Works

Average flow: 0.08 MGD

Design flow: 0.19 MGD

NPDES permit: IA0036986; Effective

Permit expires: November 2029

Population served: 958; CWNS 2022

Underwood City Of STP is a publicly owned wastewater treatment works in Underwood, Pottawattamie County, Iowa treating an average of 0.08 million gallons per day against a permitted design capacity of 0.19 MGD, serving about 958 residents. It discharges under NPDES permit IA0036986 (effective), which expires in November 2029, with 25 recorded violations in the last three years.

Treatment technology

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

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 25

Effluent violations: 25

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

Key contacts

2 verified contacts for Underwood City Of STP, with validated emails and direct phone numbers.

Unlock 2 verified contacts

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

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Underwood 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 September 13, 2026.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Filter press · FOG · all terms

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