What is the address of Caledonia WWTP?

The address on the plant’s EPA facility record is Old Highway Dr, Caledonia, MN 55921, in Houston County. Its coordinates are 43.6311, -91.5024. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Caledonia WWTP treat?

Caledonia WWTP treats an average of 0.19 MGD and is permitted for a design flow of 0.57 MGD.

What treatment technology does Caledonia WWTP use?

Klarifi has identified 3 treatment structures and unit processes at the Caledonia facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

What is the NPDES permit for Caledonia WWTP?

The facility discharges under NPDES permit MN0020231, currently administratively continued, expiring January 2024.

Is Caledonia WWTP in compliance?

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

Who operates Caledonia WWTP and how do I contact them?

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

Try for free Log in

Caledonia WWTP

Old Highway Dr, Caledonia, MN 55921 · Houston County · Publicly Owned Treatment Works

Average flow: 0.19 MGD

Design flow: 0.57 MGD

NPDES permit: MN0020231; Administratively continued

Permit expires: January 2024

Population served: 2,836; CWNS 2022

Caledonia WWTP is a publicly owned wastewater treatment works in Caledonia, Houston County, Minnesota treating an average of 0.19 million gallons per day against a permitted design capacity of 0.57 MGD, serving about 2,836 residents. It discharges under NPDES permit MN0020231 (administratively continued), which expires in January 2024, with 18 recorded violations in the last three years.

Treatment technology

3 treatment structures and unit processes identified at Caledonia WWTP.

Available with a free Klarifi account

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

Create a free account

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

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

Unlock 1 verified contact

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

Try Klarifi free

Nearby wastewater treatment plants in Minnesota

Spring Grove WWTP

Spring Grove · 9 mi away

0.23 MGD

Eitzen WWTP

Eitzen · 9 mi away

—

Houston

Houston · 10 mi away

0.06 MGD

Hokah-Well #1 Entry Point

Hokah · 12 mi away

0.07 MGD

Brownsville WWTP

Brownsville · 12 mi away

0.03 MGD

Mabel WWTP

Mabel · 15 mi away

0.05 MGD

Rushford WWTP

Rushford · 17 mi away

0.11 MGD

Peterson WWTP

Peterson · 20 mi away

0.02 MGD

Caledonia 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 16, 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