Sauk, WI
A PlainEnviro-computed score from reported facility/violation counts, not an official EPA rating, health forecast, or population-adjusted rate. See methodology.
Environmental data for Sauk in Wisconsin · Population: 65,759
Sauk, WI is tracked across three EPA datasets covering 17 Toxics Release Inventory (TRI) facilities, 25 Safe Drinking Water Act systems, and 0 Superfund National Priorities List sites. Together these generate an environmental burden score of 50/100 (Moderate Risk), calibrated against national distributions for facility density, chemical release volume, Superfund concentration, and water-system health violations.
Industrial disclosures inside the county total 2.5M lbs of reported toxic releases under EPCRA Section 313, while 10 water systems carry an active health-based violation in the SDWIS record. EPA Air Quality System monitors logged a median AQI of 37 and a peak AQI of 77 in 2024, with 85% of observed days rated "Good" (0–50).
All figures below draw directly from federal EPA records, TRI self-reported emissions, SDWIS compliance history, NPL Hazard Ranking System scores, and AQS daily AQI summaries, and are not adjusted, weighted, or forecast. A past violation or elevated score does not itself indicate current unsafe conditions; it documents the regulatory and disclosure history publicly filed with the U.S. Environmental Protection Agency through the most recent reporting cycle.
Air Quality History (2020–2024)
EPA Air Quality Index (AQI) data showing how many days per year fall into each air quality category.
| Year | Good | Moderate | Unhealthy (SG) | Max AQI |
|---|---|---|---|---|
| 2024 | 312 (85%) | 54 | 0 | 77 |
| 2023 | 218 (60%) | 123 | 16 | 271 |
| 2022 | 265 (74%) | 95 | 0 | 79 |
| 2021 | 236 (65%) | 129 | 0 | 96 |
| 2020 | 264 (72%) | 101 | 1 | 112 |
Source: EPA Air Quality System (AQS) Annual AQI by County EPA Air Quality System (AQS) Annual AQI by County AQI categories: Good (0-50), Moderate (51-100), Unhealthy for Sensitive Groups (101-150), Unhealthy (151-200), Very Unhealthy (201-300), Hazardous (301+)
For real-time air quality readings and pollutant breakdowns in Wisconsin, see the EPA's AirNow.gov.
Water Systems (25)
| System | Population | Violations |
|---|---|---|
| BARABOO WATERWORKS | 12,703 | 0 |
| REEDSBURG WATERWORKS | 9,984 | 0 |
| PRAIRIE DU SAC WATERWORKS | 4,006 | 2 |
| SAUK CITY WATERWORKS | 3,518 | 0 |
| LAKE DELTON WATERWORKS | 2,914 | 0 |
| SPRING GREEN WATERWORKS | 1,626 | 0 |
| WEST BARABOO WATERWORKS | 1,414 | 0 |
| PLAIN WATERWORKS | 792 | 1 |
| HOUSE ON THE ROCK RESORT | 470 | 2 |
| BLUFFVIEW SANITARY DISTRICT | 450 | 1 |
| MERRIMAC WATERWORKS | 440 | 2 |
| LA VALLE WATERWORKS | 365 | 18 |
| IRH BIG CEDAR | 306 | 0 |
| LOGANVILLE WATERWORKS | 300 | 0 |
| ROCK SPRINGS WATERWORKS | 292 | 2 |
| IRONTON WATERWORKS | 253 | 3 |
| MAPLE PARK CONDOMINIUMS | 150 | 1 |
| CORTLAND ACRES | 145 | 0 |
| SUNNYSIDE ESTATES | 135 | 0 |
| COZY ACRES MHP | 80 | 0 |
| GLACIER VIEW SUBDIVISION | 75 | 0 |
| SUMMER OAKS CONDO ASSOC | 70 | 0 |
| BIT O GREEN LLC MHP | 49 | 0 |
| MERRIMAC ESTATES MHP | 37 | 0 |
| DELLS ESTATES | 30 | 1 |
TRI Facilities (17)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Grede Foundries | 984.1K lbs |
| 2 | Seneca Foods Corp | 588.1K lbs |
| 3 | Saputo Cheese USA | 280.8K lbs |
| 4 | Milwaukee Valve Co LLC | 276.3K lbs |
| 5 | Saputo Cheese USA Inc. | 178.0K lbs |
| 6 | Cardinal Cg | 64.5K lbs |
| 7 | Foremost Farms USA | 56.1K lbs |
| 8 | Custom Pultrusions Inc. | 35.3K lbs |
| 9 | Coating Place Inc. Sauk City | 26.6K lbs |
| 10 | Lsc Communications / Baraboo | 19.2K lbs |
| 11 | Plateco Inc | 15.9K lbs |
| 12 | Teel Plastics LLC | 2.1K lbs |
| 13 | Cardinal Rotar | 153 lbs |
| 14 | Seats Inc | 41 lbs |
| 15 | Teel Pipe LLC | 32 lbs |
| 16 | Cardinal Glass | 18 lbs |
| 17 | Cardinal Glass | 9 lbs |
Cities in Sauk (6)
Frequently Asked Questions
What is the environmental risk level in Sauk, Wisconsin? ▼
Are there Superfund sites in Sauk? ▼
How many toxic release facilities are in Sauk? ▼
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What environmental agencies cover Sauk? ▼
What does this county environmental profile show?
This county environmental profile rolls up EPA Toxics Release Inventory facility reports, Safe Drinking Water Information System public-water-system filings, and Superfund National Priorities List sites for the county boundary defined by the U.S. Census Bureau. Facility counts reflect facilities with a reporting address inside the county, not where downstream environmental effects may be observed. Population figures are from the most recent Census ACS 5-year estimate. The county detail page is updated whenever the upstream EPA programs publish revised data; see the methodology page for the documented ingest cadence and the editorial choices governing how aggregations are computed.
Read our methodology - how this data is sourced, computed, and verified.