What is the address of Marathon WWTP?

The address on the plant’s EPA facility record is 200th Ave & 450th St, Marathon, IA 50565, in Buena Vista County. Its coordinates are 42.8563, -94.9797. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Marathon WWTP treat?

Marathon WWTP treats an average of 0.01 MGD.

What is the NPDES permit for Marathon WWTP?

The facility discharges under NPDES permit IA0067652, currently effective, expiring September 2030.

Is Marathon WWTP in compliance?

Discharge monitoring reports show 11 violations at Marathon WWTP in the last three years, 11 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Marathon WWTP and how do I contact them?

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

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Marathon WWTP

200th Ave & 450th St, Marathon, IA 50565 · Buena Vista County · Publicly Owned Treatment Works

Average flow: 0.01 MGD

Design flow: —

NPDES permit: IA0067652; Effective

Permit expires: September 2030

Population served: 230; CWNS 2022

Marathon WWTP is a publicly owned wastewater treatment works in Marathon, Buena Vista County, Iowa treating an average of 0.01 million gallons per day, serving about 230 residents. It discharges under NPDES permit IA0067652 (effective), which expires in September 2030, with 11 recorded violations in the last three years.

Treatment technology

Treatment structures and unit processes at Marathon WWTP.

Treatment structure data not yet analyzed for this facility.

Compliance snapshot (last 3 years)

Total violations: 11

Effluent violations: 11

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

Key contacts

2 verified contacts for Marathon WWTP, with validated emails and direct phone numbers.

Unlock 2 verified contacts

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

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Marathon 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 February 28, 2025.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Oxidation ditch · Anaerobic digester · all terms

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