What is the address of Croswell WWTP?

The address on the plant’s EPA facility record is 5580 Lancaster, Croswell, MI 48422, in Sanilac County. Its coordinates are 43.2620, -82.6195. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Croswell WWTP treat?

Croswell WWTP treats an average of 0.46 MGD.

What treatment technology does Croswell WWTP use?

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

What is the NPDES permit for Croswell WWTP?

The facility discharges under NPDES permit MI0021083, currently administratively continued, expiring October 2025.

Is Croswell WWTP in compliance?

Discharge monitoring reports show 120 violations at Croswell WWTP in the last three years, 96 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Croswell WWTP and how do I contact them?

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

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Croswell WWTP

5580 Lancaster, Croswell, MI 48422 · Sanilac County · Publicly Owned Treatment Works

Average flow: 0.46 MGD

Design flow: —

NPDES permit: MI0021083; Administratively continued

Permit expires: October 2025

Population served: 2,545; CWNS 2022

Croswell WWTP is a publicly owned wastewater treatment works in Croswell, Sanilac County, Michigan treating an average of 0.46 million gallons per day, serving about 2,545 residents. It discharges under NPDES permit MI0021083 (administratively continued), which expires in October 2025, with 120 recorded violations in the last three years.

Treatment technology

One treatment structure or unit process identified at Croswell WWTP.

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 120

Effluent violations: 96

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

Key contacts

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

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

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Sandusky WWTP

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Croswell 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 April 4, 2025.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · FOG · Equalization tank · all terms

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