What is the address of Onsted WWTP?

The address on the plant’s EPA facility record is 8657 Slee Road, Onsted, MI 49265, in Lenawee County. Its coordinates are 41.9957, -84.1624. For some plants the record holds the utility’s mailing address rather than the plant gate.

What treatment technology does Onsted WWTP use?

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

What is the NPDES permit for Onsted WWTP?

The facility discharges under NPDES permit MI0028304, currently effective, expiring October 2028.

Is Onsted WWTP in compliance?

Discharge monitoring reports show 2 violations at Onsted WWTP in the last three years, 2 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Onsted WWTP and how do I contact them?

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

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Onsted WWTP

8657 Slee Road, Onsted, MI 49265 · Lenawee County · Publicly Owned Treatment Works

Average flow: —

Design flow: —

NPDES permit: MI0028304; Effective

Permit expires: October 2028

Population served: 829; CWNS 2022

Onsted WWTP is a publicly owned wastewater treatment works in Onsted, Lenawee County, Michigan, serving about 829 residents. It discharges under NPDES permit MI0028304 (effective), which expires in October 2028, with 2 recorded violations in the last three years.

Treatment technology

One treatment structure or unit process identified at Onsted WWTP.

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 2

Effluent violations: 2

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

Key contacts

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

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

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Onsted 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 19, 2026; facility record last updated April 4, 2025.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Anaerobic digester · Lift station · all terms

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