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Promise City, City Of STP

0.2 Miles South Of 225th St & Hwy 2 Intersection, Promise City, IA 52583 · Wayne County · Publicly Owned Treatment Works

Average flow
—
Design flow
0.01 MGD
NPDES permit
IA0082007
Effective
Permit expires
January 2028
Population served
88
CWNS 2022

Promise City, City Of STP is a publicly owned wastewater treatment works in Promise City, Wayne County, Iowa, serving about 88 residents. It discharges under NPDES permit IA0082007 (effective), which expires in January 2028, with 7 recorded violations in the last three years.

Treatment technology

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

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Compliance snapshot (last 3 years)

Total violations
7
Effluent violations
1

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

Key contacts

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

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Nearby wastewater treatment plants in Iowa

Seymour City Of STP

Seymour · 5 mi away

0.04 MGD

Plano Iowa-Adlm-Fms

Plano · 6 mi away

—

Corydon City Of STP

Corydon · 9 mi away

0.47 MGD

Mystic City Of STP

Mystic · 11 mi away

—

Allerton City Of STP North

Allerton · 12 mi away

—

Allerton City Of STP South

Allerton · 12 mi away

0.03 MGD

Centerville City Of STP (west)

Centerville · 13 mi away

0.25 MGD

Cincinnati City Of STP

Cincinnati · 13 mi away

0.2 MGD

Promise City, 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 · WWTP · Biosolids · all terms


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