Monroe, 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 Monroe in Wisconsin · Population: 46,169
TRI sites such as U.S. Army Fort McCoy Range Facility; Necal LLC; Foremost Farms USA; SDWIS systems such as CASHTON WATERWORKS; WARRENS WATERWORKS; WILTON WATERWORKS; NPL sites such as Northern Engraving Co.; Tomah Armory; Tomah Fairgrounds anchor Monroe, WI's EPA extract. Derived burden score 51/100 (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 Monroe include WILTON WATERWORKS; KENDALL WATERWORKS; PEARCES MOBILE HOME ESTATES, while U.S. Army Fort McCoy Range Facility leads reported TRI pounds among local Form R filers. AQS median AQI 23 / peak 90 in 2024.
Burden score 51/100 (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 Monroe -- 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 Monroe, WI: EPA TRI 2023 reporting year
Same facilities, both years
-43.2%
9 facilities that filed in 2022 and 2023
Whole inventory
-43.2%
85.6 thousand lb → 48.6 thousand lb, every facility that filed
- Monroe, WI's total reported releases fell from 85.6 thousand lb in 2022 to 48.6 thousand lb in 2023, based on EPA TRI filings.
- Monroe, WI's air releases fell from 13.6 thousand lb in 2022 to 2.1 thousand lb in 2023, based on EPA TRI filings.
- Monroe, WI's land releases fell from 71.7 thousand lb in 2022 to 46.3 thousand lb in 2023, based on EPA TRI filings.
- Monroe, WI's chemicals reported fell from 14 in 2022 to 13 in 2023, based on EPA TRI filings.
Air Quality History (2021–2024)
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 | 258 (90%) | 30 | 0 | 90 |
| 2023 | 252 (69%) | 108 | 3 | 173 |
| 2022 | 295 (81%) | 68 | 1 | 132 |
| 2021 | 216 (82%) | 49 | 0 | 94 |
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 (5)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| CASHTON WATERWORKS | 1,120 | 0 |
| WARRENS WATERWORKS | 540 | 0 |
| WILTON WATERWORKS | 490 | 4 |
| KENDALL WATERWORKS | 458 | 6 |
| PEARCES MOBILE HOME ESTATES | 37 | 7 |
TRI Facilities (9)
| # | Facility | Total Releases |
|---|---|---|
| 1 | U.S. Army Fort McCoy Range Facility | 310.7K lbs |
| 2 | Necal LLC | 25.1K lbs |
| 3 | Foremost Farms USA | 15.3K lbs |
| 4 | Hartland Lubricants & Chemicals-Sparta | 1.6K lbs |
| 5 | Transcontinental US LLC | 63 lbs |
| 6 | Northern Engraving Corp | 10 lbs |
| 7 | Mars Petcare US Inc. | 0 lbs |
| 8 | Toro Co | 0 lbs |
| 9 | Cardinal Glass | 0 lbs |
Superfund Sites (4)
| Site Name | Status | HRS Score |
|---|---|---|
| Northern Engraving Co. | Deleted NPL Site | 38.75 |
| Tomah Armory | Deleted NPL Site | 30.63 |
| Tomah Fairgrounds | Deleted NPL Site | 32.87 |
| Tomah Municipal Sanitary Landfill | NPL Site | 45.91 |
Cities in Monroe (7)
Frequently Asked Questions
What is the environmental risk level in Monroe, Wisconsin? ▼
Are there Superfund sites in Monroe? ▼
How many toxic release facilities are in Monroe? ▼
What is the air quality in Monroe? ▼
Is the drinking water safe in Monroe? ▼
What environmental agencies cover Monroe? ▼
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.