How much wastewater does Marysville WWTP treat?

Marysville WWTP treats an average of 1.5 MGD.

What treatment technology does Marysville WWTP use?

Klarifi has identified clarifiers, biogas silos at the Marysville facility.

What is the NPDES permit for Marysville WWTP?

The facility discharges under NPDES permit MI0020656, currently effective, expiring October 2028.

Is Marysville WWTP in compliance?

Discharge monitoring reports show 1 violation at Marysville WWTP in the last three years, 1 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Marysville WWTP and how do I contact them?

Marysville WWTP is a publicly owned treatment works in Marysville, Michigan. Klarifi lists 12 verified decision-maker contacts for this facility, available with a free trial.

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Marysville WWTP

Marysville, MI · St. Clair County · Publicly Owned Treatment Works

Average flow: 1.5 MGD

Design flow: —

NPDES permit: MI0020656; Effective

Permit expires: October 2028

Population served: 10,445; CWNS 2022

Marysville WWTP is a publicly owned wastewater treatment works in Marysville, St. Clair County, Michigan treating an average of 1.5 million gallons per day, serving about 10,445 residents. Treatment on site includes clarifiers, biogas silos. It discharges under NPDES permit MI0020656 (effective), which expires in October 2028, with 1 recorded violation 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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Biogas silos

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Compliance snapshot (last 3 years)

Total violations: 1

Effluent violations: 1

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

Key contacts

12 verified contacts for Marysville WWTP, with validated emails and direct phone numbers.

Unlock 12 verified contacts (9 more than shown)

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

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Nearby wastewater treatment plants in Michigan

City Of Port Huron Wastewater Treatment Plant

Port Huron · 5 mi away

6.03 MGD

St Clair WWTP

St Clair · 6 mi away

0.72 MGD

St Clair River Sa WWTP

East China · 10 mi away

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Marine City WWTP

Marine City · 14 mi away

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Memphis Wwsl

Memphis · 15 mi away

—

Emmett Wwsl

Emmett · 16 mi away

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St Clair County-Algonac WWTP

Algonac · 20 mi away

1.35 MGD

New Baltimore WWTP

New Baltimore · 21 mi away

0.83 MGD

Marysville 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 September 11, 2026; facility record last updated March 3, 2025.

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