What is the address of Oslo WWTP?

The address on the plant’s EPA facility record is Highway 220, Oslo, MN 56744, in Marshall County. Its coordinates are 48.2041, -97.1139. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Oslo WWTP treat?

Oslo WWTP is permitted for a design flow of 0.13 MGD. Its average daily flow is not available in the current EPA data.

What treatment technology does Oslo WWTP use?

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

What is the NPDES permit for Oslo WWTP?

The facility discharges under NPDES permit MNG585379, currently effective, expiring November 2028.

Is Oslo WWTP in compliance?

Discharge monitoring reports show no violations at Oslo WWTP in the last three years.

Who operates Oslo WWTP and how do I contact them?

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

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Oslo WWTP

Highway 220, Oslo, MN 56744 · Marshall County · Publicly Owned Treatment Works

Average flow: —

Design flow: 0.13 MGD

NPDES permit: MNG585379; Effective

Permit expires: November 2028

Population served: 356; CWNS 2022

Oslo WWTP is a publicly owned wastewater treatment works in Oslo, Marshall County, Minnesota, serving about 356 residents. It discharges under NPDES permit MNG585379 (effective), which expires in November 2028, with 0 recorded violations in the last three years.

Treatment technology

One treatment structure or unit process identified at Oslo WWTP.

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 0

Effluent violations: 0

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

Key contacts

Decision-makers at Oslo WWTP.

No verified contacts on file yet

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Nearby wastewater treatment plants in Minnesota

Alvarado WWTP

Alvarado · 5 mi away

—

Warren WWTP

Warren · 15 mi away

0.16 MGD

Argyle WWTP

Argyle · 16 mi away

—

Kennedy WWTP

Kennedy · 32 mi away

—

Viking Wastewater Treatment I

Viking · 32 mi away

—

Fisher WWTP

Fisher Township · 32 mi away

—

Crookston WWTP

Crookston · 37 mi away

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Newfolden WWTP

New Folden Township · 37 mi away

—

Oslo 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 July 19, 2026.

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

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