Sauk, WI
Transparent derived index from EPA TRI / SDWIS / Superfund extracts: not an official EPA rating. Fixed caps: facilities ≤25 pts (50+ = max), log10 releases ≤25 pts, Superfund ≤25 pts (5/site), health-violation systems ≤15 pts (3/system), high-chemical facilities ≤10 pts. Bands: High ≥60, Moderate ≥30. See methodology.
Environmental data for Sauk in Wisconsin · Population: 65,759
TRI sites such as Grede Foundries; Seneca Foods Corp; Saputo Cheese USA; SDWIS systems such as BARABOO WATERWORKS; SAUK CITY WATERWORKS; LAKE DELTON WATERWORKS; NPL sites such as Sauk County Landfill anchor Sauk, WI's EPA extract. Derived burden score 55/100 (Moderate Risk) uses fixed national caps on density, log release volume, Superfund count, and health-flagged systems - not an official EPA rating.
Health-flagged SDWIS rows in Sauk include PLAIN WATERWORKS; BLUFFVIEW SANITARY DISTRICT; MERRIMAC WATERWORKS, while Grede Foundries leads reported TRI pounds among local Form R filers. AQS median AQI 37 / peak 77 in 2024.
Burden score 55/100 (Moderate Risk) is the only weighted composite on this page. The tables below list every TRI facility, SDWIS system, and Superfund site EPA has on record for Sauk -- not just the names called out above -- reproducing the disclosure history as filed, not a current-safety verdict. Extract current as of 2026-08-25.
Release-over-release change
What changed for Sauk, WI: EPA TRI 2023 reporting year
Same facilities, both years
+4.4%
15 facilities that filed in 2022 and 2023
Whole inventory
+4.4%
438.5 thousand lb → 457.8 thousand lb, every facility that filed
- Sauk, WI's total reported releases rose from 438.5 thousand lb in 2022 to 457.8 thousand lb in 2023, based on EPA TRI filings.
- Sauk, WI's water releases fell from 136 lb in 2022 to 101 lb in 2023, based on EPA TRI filings.
- Sauk, WI's off-site transfers rose from 316.8 thousand lb in 2022 to 338.0 thousand lb in 2023, based on EPA TRI filings.
- Sauk, WI's chemicals reported rose from 22 in 2022 to 23 in 2023, based on EPA TRI filings.
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 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 (21)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| BARABOO WATERWORKS | 12,703 | 0 |
| 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 |
| BLUFFVIEW SANITARY DISTRICT | 450 | 1 |
| MERRIMAC WATERWORKS | 440 | 3 |
| IRH BIG CEDAR | 306 | 0 |
| LOGANVILLE WATERWORKS | 300 | 0 |
| ROCK SPRINGS WATERWORKS | 292 | 2 |
| IRONTON WATERWORKS | 253 | 3 |
| MAPLE PARK CONDOMINIUMS | 150 | 2 |
| 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 |
Superfund Sites (1)
| Site Name | Status | HRS Score |
|---|---|---|
| Sauk County Landfill | NPL Site | 34.21 |
Cities in Sauk (12)
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? ▼
What is the air quality in Sauk? ▼
Is the drinking water safe in Sauk? ▼
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.