What is the address of City Of Marathon Area 3 WWTP?

The address on the plant’s EPA facility record is 4095 Overseas Highway, Marathon, FL, in Monroe County. Its coordinates are 24.7126, -81.0873. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does City Of Marathon Area 3 WWTP treat?

City Of Marathon Area 3 WWTP treats an average of 0.25 MGD and is permitted for a design flow of 0.25 MGD.

What treatment technology does City Of Marathon Area 3 WWTP use?

Klarifi has identified 5 treatment structures and unit processes at the Marathon facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

What is the NPDES permit for City Of Marathon Area 3 WWTP?

The facility discharges under NPDES permit FLA642851, currently effective, expiring May 2030.

Who operates City Of Marathon Area 3 WWTP and how do I contact them?

City Of Marathon Area 3 WWTP is a publicly owned treatment works in Marathon, Florida. Klarifi lists 1 verified decision-maker contact for this facility, available with a free trial.

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City Of Marathon Area 3 WWTP

4095 Overseas Highway, Marathon, FL · Monroe County · Publicly Owned Treatment Works

Average flow: 0.25 MGD

Design flow: 0.25 MGD

NPDES permit: FLA642851; Effective

Permit expires: May 2030

Population served: —; CWNS 2022

City Of Marathon Area 3 WWTP is a publicly owned wastewater treatment works in Marathon, Monroe County, Florida treating an average of 0.25 million gallons per day against a permitted design capacity of 0.25 MGD. It discharges under NPDES permit FLA642851 (effective), which expires in May 2030.

Treatment technology

5 treatment structures and unit processes identified at City Of Marathon Area 3 WWTP.

Available with a free Klarifi account

See the full treatment train at City Of Marathon Area 3 WWTP: structures, unit processes and planned upgrades, with exact unit counts.

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Compliance snapshot (last 3 years)

Total violations: —

Effluent violations: —

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

Key contacts

1 verified contact for City Of Marathon Area 3 WWTP, with validated emails and direct phone numbers.

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Names, validated emails and direct phone numbers for decision-makers at City Of Marathon Area 3 WWTP, plus the full compliance history and discharge data.

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Nearby wastewater treatment plants in Florida

City Of Marathon Area 4 WWTP

Marathon · 1 mi away

0.4 MGD

City Of Marathon Area 5 Little Venice WWTP

Marathon · 3 mi away

0.45 MGD

Marathon, City Of - Area 6

Marathon · 5 mi away

0.2 MGD

City Of Marathon Area 7 WWTP

Marathon · 10 mi away

0.2 MGD

Duck Key Wastewater Cooperative

Duck Key · 12 mi away

0.27 MGD

Bahia Honda State Park Sand Spur 3

Big Pine Key · 12 mi away

0.02 MGD

City Of Layton WWTP

Layton · 18 mi away

0.07 MGD

Cudjoe Key AWWTP

Cudjoe Key · 27 mi away

0.94 MGD

City Of Marathon Area 3 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 October 22, 2026.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Centrate · Ozonation · all terms

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