What is the address of Rock Rapids City Of STP?

The address on the plant’s EPA facility record is 1205 S. East Street, Rock Rapids, IA 51246, in Lyon County. Its coordinates are 43.4204, -96.1613. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Rock Rapids City Of STP treat?

Rock Rapids City Of STP treats an average of 0.28 MGD and is permitted for a design flow of 1.1 MGD.

What treatment technology does Rock Rapids City Of STP use?

Klarifi has identified 3 treatment structures and unit processes at the Rock Rapids facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

What is the NPDES permit for Rock Rapids City Of STP?

The facility discharges under NPDES permit IA0032786, currently administratively continued, expiring June 2026.

Is Rock Rapids City Of STP in compliance?

Discharge monitoring reports show 2 violations at Rock Rapids City Of STP in the last three years, 2 of them effluent limit exceedances. The full history is available in Klarifi.

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

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

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Rock Rapids City Of STP

1205 S. East Street, Rock Rapids, IA 51246 · Lyon County · Publicly Owned Treatment Works

Average flow: 0.28 MGD

Design flow: 1.1 MGD

NPDES permit: IA0032786; Administratively continued

Permit expires: June 2026

Population served: —; CWNS 2022

Rock Rapids City Of STP is a publicly owned wastewater treatment works in Rock Rapids, Lyon County, Iowa treating an average of 0.28 million gallons per day against a permitted design capacity of 1.1 MGD. It discharges under NPDES permit IA0032786 (administratively continued), which expires in June 2026, with 2 recorded violations in the last three years.

Treatment technology

3 treatment structures and unit processes identified at Rock Rapids City Of STP.

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 2

Effluent violations: 2

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

Key contacts

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

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Nearby wastewater treatment plants in Iowa

Lester City Of STP

Lester · 9 mi away

0.07 MGD

Alvord City Of STP

Alvord · 9 mi away

—

George City Of STP

George · 10 mi away

0.08 MGD

Doon City Of STP

Doon · 11 mi away

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Little Rock City Of STP

Little Rock · 13 mi away

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Larchwood City Of STP

Larchwood · 15 mi away

—

Hull City Of STP

Hull · 15 mi away

0.21 MGD

Inwood City Of STP

Inwood · 16 mi away

0.04 MGD

Rock Rapids 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 · Sludge dewatering · Biological nutrient removal · all terms

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