What environmental databases are included?

This page aggregates data from eight EPA databases: Safe Drinking Water (SDWIS), Superfund/NPL sites, Toxic Release Inventory (TRI), Air Quality Index (AQI), Leaking Underground Storage Tanks (LUST), NPDES water discharge permits, RCRA hazardous waste, and Brownfields.

What does the Air Quality Index (AQI) mean?

AQI is measured on a scale from 0 to 500. Values under 50 are 'Good,' 51-100 is 'Moderate,' and above 100 is 'Unhealthy for Sensitive Groups.' AQI is measured at the county level since air quality monitoring stations are sparse. Your town shares its county's AQI reading.

What is a Superfund site?

A Superfund site is a location contaminated by hazardous waste that has been placed on the EPA's National Priorities List (NPL) for long-term cleanup. These sites pose serious risks to human health and the environment. Cleanup can take decades and cost hundreds of millions of dollars.

Friesland, WI

CSAMadison-Janesville-Beloit MSAMadison#28/57 Income

WI DNR BRRTS

Environmental Reporti

10sites monitored

Goodair quality (AQI 42)

9water violations

Air Quality

Good

Water Violations

Active Permits

Air quality in Columbia County is rated good with a median AQI of 42 (91 days measured in 2025). 1 community water system serve the area, with 9 recent violations in the last 5 years.

Air Quality — Columbia County (2025)i

AQS

The Air Quality Index measures how clean or polluted the air is on a given day. AQI is reported at the county level. A score of 0-50 is considered good; 51-100 is moderate; above 100 may be unhealthy for sensitive groups.

Good

Median AQI

050100150200300

max 108

PM2.5 Daysi

Ozone Daysi

Drinking Wateri

SDWIS

Public water systems registered to serve this area. Community systems (CWS) provide water to residents year-round. Violations indicate a system failed to meet federal drinking water standards.

Community Systemsi

Active Systemsi

Recent Violationsi

Non-Transient (3)

Community (1)

Recent Violations (Last 5 Years)

FRIESLAND WATERWORKS

9 violationsLatest: 2025-12-01

EPA

FRIESLAND WATERWORKSCommunity9vEPA

UNITED WI GRAIN PRODUCERSNon-TransientEPA

ALSUM PRODUCE INC - OLD SYSTEMNon-TransientEPA

Industrial Monitoringi

Toxic Release Inventory (TRI)i

TRI

1 facilities

UNITED WISCONSIN GRAIN PRODUCERSW1231 TESSMANN DR5 chemicalsTRI

Wastewater & Stormwater Permits (NPDES)i

NPDES

0 active5 expired

CUPERY & DEYOUNG STORAGE CORP./ADAMS TNST. 1111 E WINNEBAGO STREETMinor DischargeEPA

FRIESLAND WATERWORKSSEQ, NWQ, SEC 22, T13N, R12E, RANDOLPH TWP, FRIESLPOTWEPA

ALSUM FARM & PRODUCE INCN9083 CO RD EFMinor DischargeEPA