What is the address of Grand Marais?

The address on the plant’s EPA facility record is 321 East Second St., Grand Marais, MN 55604, in Cook County. Its coordinates are 47.7521, -90.3276. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Grand Marais treat?

Grand Marais treats an average of 0.49 MGD and is permitted for a design flow of 0.99 MGD.

What treatment technology does Grand Marais use?

Klarifi has identified 2 treatment structures and unit processes at the Grand Marais facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

What is the NPDES permit for Grand Marais?

The facility discharges under NPDES permit MN0020010, currently effective, expiring October 2029.

Is Grand Marais in compliance?

Discharge monitoring reports show 18 violations at Grand Marais in the last three years, 18 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Grand Marais and how do I contact them?

Grand Marais is a publicly owned treatment works in Grand Marais, Minnesota. Klarifi lists decision-maker contacts for this facility, available with a free trial.

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Grand Marais

321 East Second St., Grand Marais, MN 55604 · Cook County · Publicly Owned Treatment Works

Average flow: 0.49 MGD

Design flow: 0.99 MGD

NPDES permit: MN0020010; Effective

Permit expires: October 2029

Population served: 1,514; CWNS 2022

Grand Marais is a publicly owned wastewater treatment plant in Grand Marais, Cook County, Minnesota treating an average of 0.49 million gallons per day against a permitted design capacity of 0.99 MGD, serving about 1,514 residents. It discharges under NPDES permit MN0020010 (effective), which expires in October 2029, with 18 recorded violations in the last three years.

Treatment technology

2 treatment structures and unit processes identified at Grand Marais.

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 18

Effluent violations: 18

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

Key contacts

Decision-makers at Grand Marais.

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Nearby wastewater treatment plants in Minnesota

Usdi Bia Grnd Prtg Ind Res

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Silver Bay · 54 mi away

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Beaver Bay WWTP

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Winton WWTP

Winton · 70 mi away

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Ely WWTP

Ely · 72 mi away

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Babbitt WWTP

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Two Harbors WWTP

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Hoyt Lakes WWTP

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Grand Marais: 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 January 25, 2025.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Activated sludge · Oxidation ditch · all terms

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