What is the address of Oronoco WWTP?

The address on the plant’s EPA facility record is 115 2nd St NW, Oronoco, MN 55960, in Olmsted County. Its coordinates are 44.1309, -92.5149. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Oronoco WWTP treat?

Oronoco WWTP treats an average of 0.1 MGD and is permitted for a design flow of 1.28 MGD.

What treatment technology does Oronoco WWTP use?

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

What is the NPDES permit for Oronoco WWTP?

The facility discharges under NPDES permit MN0071421, currently administratively continued, expiring January 2025.

Is Oronoco WWTP in compliance?

Discharge monitoring reports show 30 violations at Oronoco WWTP in the last three years, 25 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Oronoco WWTP and how do I contact them?

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

Try for free Log in

Oronoco WWTP

115 2nd St NW, Oronoco, MN 55960 · Olmsted County · Publicly Owned Treatment Works

Average flow: 0.1 MGD

Design flow: 1.28 MGD

NPDES permit: MN0071421; Administratively continued

Permit expires: January 2025

Population served: —; CWNS 2022

Oronoco WWTP is a publicly owned wastewater treatment works in Oronoco, Olmsted County, Minnesota treating an average of 0.1 million gallons per day against a permitted design capacity of 1.28 MGD. It discharges under NPDES permit MN0071421 (administratively continued), which expires in January 2025, with 30 recorded violations in the last three years.

Treatment technology

2 treatment structures and unit processes identified at Oronoco WWTP.

Available with a free Klarifi account

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

Create a free account

Compliance snapshot (last 3 years)

Total violations: 30

Effluent violations: 25

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

Key contacts

Decision-makers at Oronoco WWTP.

No verified contacts on file yet

Klarifi verifies plant and municipal decision-makers continuously. Start a free trial to browse contacts at nearby plants and flag this one for verification.

Try Klarifi free

Nearby wastewater treatment plants in Minnesota

Rochester Water Reclamation Plant

Rochester · 5 mi away

11.39 MGD

Pine Island WWTP

Pine Island · 8 mi away

0.23 MGD

Byron WWTP

Byron · 9 mi away

0.5 MGD

Hammond WWTP

Zumbro Falls · 9 mi away

0.0065 MGD

Zumbro Falls WWTP

Zumbro Falls · 12 mi away

—

Kasson WWTP

Kasson · 12 mi away

0.63 MGD

Zumbrota WWTP

Zumbrota · 14 mi away

0.54 MGD

Bellechester WWTP

Bellchester · 16 mi away

—

Oronoco 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 September 13, 2026.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Biological nutrient removal · Tertiary treatment · all terms

Try Klarifi for free

Create your own trial account and explore how Klarifi can help you.

Try for free