What is the address of Marble Rock WWTP?

The address on the plant’s EPA facility record is On Upper Greene Road, South Of, Marble Rock, IA 50653, in Floyd County. Its coordinates are 42.9558, -92.8684. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Marble Rock WWTP treat?

Marble Rock WWTP is permitted for a design flow of 0.09 MGD. Its average daily flow is not available in the current EPA data.

What treatment technology does Marble Rock WWTP use?

Klarifi has identified one treatment structure or unit process at the Marble Rock facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

What is the NPDES permit for Marble Rock WWTP?

The facility discharges under NPDES permit IA0057207, currently effective, expiring January 2031.

Is Marble Rock WWTP in compliance?

Discharge monitoring reports show no violations at Marble Rock WWTP in the last three years.

Who operates Marble Rock WWTP and how do I contact them?

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

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Marble Rock WWTP

On Upper Greene Road, South Of, Marble Rock, IA 50653 · Floyd County · Publicly Owned Treatment Works

Average flow: —

Design flow: 0.09 MGD

NPDES permit: IA0057207; Effective

Permit expires: January 2031

Population served: 250; CWNS 2022

Marble Rock WWTP is a publicly owned wastewater treatment works in Marble Rock, Floyd County, Iowa, serving about 250 residents. It discharges under NPDES permit IA0057207 (effective), which expires in January 2031, with 0 recorded violations in the last three years.

Treatment technology

One treatment structure or unit process identified at Marble Rock WWTP.

Available with a free Klarifi account

See the full treatment train at Marble Rock WWTP: structures, unit processes and planned upgrades, with exact unit counts.

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Compliance snapshot (last 3 years)

Total violations: 0

Effluent violations: 0

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

Key contacts

1 verified contact for Marble Rock WWTP, with validated emails and direct phone numbers.

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Names, validated emails and direct phone numbers for decision-makers at Marble Rock WWTP, plus the full compliance history and discharge data.

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Nearby wastewater treatment plants in Iowa

Greene City Of STP

Greene · 6 mi away

0.09 MGD

Rockford WWTP

Rockford · 7 mi away

0.29 MGD

Dougherty City Of STP

Dougherty · 8 mi away

—

Rudd WWTP

Rudd · 12 mi away

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Floyd City Of STP

Floyd · 14 mi away

0.03 MGD

Nora Springs City Of STP

Nora Springs · 14 mi away

0.13 MGD

Allison City Of STP

Allison · 16 mi away

0.31 MGD

Dumont City Of STP

Dumont · 16 mi away

0.26 MGD

Marble Rock WWTP: 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 November 26, 2025.

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

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