How much wastewater does Island STP treat?

Island STP treats an average of 0.03 MGD and is permitted for a design flow of 0.13 MGD.

What treatment technology does Island STP use?

Klarifi has identified clarifiers, carrousels / oxidation ditches at the Island facility.

What is the NPDES permit for Island STP?

The facility discharges under NPDES permit KY0066605, currently effective, expiring June 2028.

Is Island STP in compliance?

Discharge monitoring reports show 25 violations at Island STP in the last three years, 23 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Island STP and how do I contact them?

Island STP is a publicly owned treatment works in Island, Kentucky. Klarifi lists decision-maker contacts for this facility, available with a free trial.

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Island STP

Island, KY · Mclean County · Publicly Owned Treatment Works

Average flow: 0.03 MGD

Design flow: 0.13 MGD

NPDES permit: KY0066605; Effective

Permit expires: June 2028

Population served: 494; CWNS 2022

Island STP is a publicly owned wastewater treatment works in Island, Mclean County, Kentucky treating an average of 0.03 million gallons per day against a permitted design capacity of 0.13 MGD, serving about 494 residents. Treatment on site includes clarifiers, carrousels / oxidation ditches. It discharges under NPDES permit KY0066605 (effective), which expires in June 2028, with 25 recorded violations in the last three years.

Treatment technology

Treatment structures identified at this facility. Exact unit counts are available in Klarifi.

Clarifiers

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Carrousels / oxidation ditches

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Compliance snapshot (last 3 years)

Total violations: 25

Effluent violations: 23

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

Key contacts

Decision-makers at Island STP.

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Nearby wastewater treatment plants in Kentucky

Livermore STP

Livermore · 3 mi away

0.03 MGD

Sacramento STP

Sacramento · 7 mi away

0.01 MGD

Calhoun WWTP

Calhoun · 9 mi away

0.2 MGD

Powderly, City Of

Powderly · 15 mi away

—

Greenville STP

Greenville · 15 mi away

0.86 MGD

Drakesboro STP

Drakesboro · 17 mi away

0.04 MGD

South Hopkins Regional WWTP

Nortonville · 24 mi away

0.16 MGD

Rwra Max Rhoads WWTP

Owensboro · 24 mi away

6.56 MGD

Island 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 September 11, 2026; facility record last updated November 26, 2025.

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