What is the address of Central City City Of STP?

The address on the plant’s EPA facility record is 137 4th St, Central City, IA 52214, in Linn County. Its coordinates are 42.1996, -91.5215. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Central City City Of STP treat?

Central City City Of STP treats an average of 0.12 MGD and is permitted for a design flow of 0.29 MGD.

What treatment technology does Central City City Of STP use?

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

What is the NPDES permit for Central City City Of STP?

The facility discharges under NPDES permit IA0027979, currently effective, expiring February 2027.

Is Central City City Of STP in compliance?

Discharge monitoring reports show 6 violations at Central City City Of STP in the last three years, 6 of them effluent limit exceedances. The full history is available in Klarifi.

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

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

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Central City City Of STP

137 4th St, Central City, IA 52214 · Linn County · Publicly Owned Treatment Works

Average flow: 0.12 MGD

Design flow: 0.29 MGD

NPDES permit: IA0027979; Effective

Permit expires: February 2027

Population served: 1,264; CWNS 2022

Central City City Of STP is a publicly owned wastewater treatment works in Central City, Linn County, Iowa treating an average of 0.12 million gallons per day against a permitted design capacity of 0.29 MGD, serving about 1,264 residents. It discharges under NPDES permit IA0027979 (effective), which expires in February 2027, with 6 recorded violations in the last three years.

Treatment technology

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

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 6

Effluent violations: 6

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

Key contacts

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

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Nearby wastewater treatment plants in Iowa

Prairieburg City Of STP

Prairieburg · 5 mi away

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Coggon WWTP

Coggon · 6 mi away

0.13 MGD

Alburnett WWTP

Alburnett · 6 mi away

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Troy Mills Sanitary District

Walker · 10 mi away

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Ryan WWTP

Ryan · 11 mi away

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Springville WWTP

Springville · 12 mi away

0.49 MGD

Center Point, City Of STP (south)

Center Point · 13 mi away

0.3 MGD

Fairview, Community Of

Anamosa · 13 mi away

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Central 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 March 28, 2025.

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

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