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Cass, MI

Low Risk (29/100)

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 Cass in Michigan · Population: 51,606

TRI sites such as Postle Extrusions; Mercury Displacement Industries Inc.; Autocam; SDWIS systems such as DOWAGIAC; CASSOPOLIS; CASS COUNTY WATER SYSTEM; NPL sites such as U.S. Aviex anchor Cass, MI's EPA extract. Derived burden score 29/100 (Low 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 Cass include CASS COUNTY WATER SYSTEM; BAIR LAKE BIBLE CAMP; COLONIAL ACRES, while Postle Extrusions leads reported TRI pounds among local Form R filers. AQS median AQI 42 / peak 108 in 2024.

Burden score 29/100 (Low 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 Cass -- 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 Cass, MI: EPA TRI 2023 reporting year

2022 → 2023

Same facilities, both years

-35.9%

5 facilities that filed in 2022 and 2023

Whole inventory

-35.8%

1.7 thousand lb → 1.1 thousand lb, every facility that filed

Between the two reporting years, 1 facility filed for the first time and 0 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.

  • Cass, MI's total reported releases fell from 1.7 thousand lb in 2022 to 1.1 thousand lb in 2023, based on EPA TRI filings.
  • Cass, MI's air releases fell from 1.7 thousand lb in 2022 to 1.1 thousand lb in 2023, based on EPA TRI filings.
County population (Census ACS)
51,606
TRI Facilities
6
Water Systems
11
Superfund Sites
1
Total Releases
6.2K lbs

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 205 (82%) 45 1 108
2023 190 (78%) 45 9 126
2022 212 (91%) 19 2 119
2021 235 (89%) 29 1 112
2020 212 (84%) 36 5 122
2024 Good Air Quality: 82% of days
Unhealthy days: 1
Median AQI: 42

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 Michigan, see the EPA's AirNow.gov.

Water Systems (11)

System System pop (SDWIS) Violations
DOWAGIAC 6,350 0
CASSOPOLIS 1,815 0
CASS COUNTY WATER SYSTEM 1,350 3
EDWARDSBURG 1,260 0
MARCELLUS 1,198 0
BAIR LAKE BIBLE CAMP 372 2
COLONIAL ACRES 265 1
LINDEN MOBILE HOME PARK 92 0
WHITE PINES MOBILE HOME PARK 90 0
COLONY BAY CONDOMINIUMS 75 0
EAGLE LAKE CONDOMINIUMS 26 0

TRI Facilities (6)

# Facility Total Releases
1 Postle Extrusions 6.2K lbs
2 Mercury Displacement Industries Inc. 5 lbs
3 Autocam 1 lbs
4 Michigan Die Castings 0 lbs
5 Midwest Timber Inc 0 lbs
6 Mennel Milling Co of Michigan 0 lbs

Superfund Sites (1)

Site Name Status HRS Score
U.S. Aviex NPL Site 33.66

Cities in Cass (6)

Dowagiac
3 facilities · 3 water
Edwardsburg
2 facilities · 4 water
Cassopolis
1 facilities · 2 water
Jones
0 facilities · 1 water
Marcellus
0 facilities · 1 water
Howard Township
0 facilities · 0 water

Frequently Asked Questions

What is the environmental risk level in Cass, Michigan? ▼
Cass, MI has an environmental risk score of 29/100 (Low Risk), based on 6 TRI facilities, 1 Superfund sites, and 11 water systems on record. 3 water systems have health-based violations. Source: EPA TRI, SDWIS, and Superfund NPL.
Are there Superfund sites in Cass? ▼
Yes, Cass, MI has 1 Superfund site on the EPA National Priorities List (NPL). Superfund sites are contaminated locations that require long-term cleanup under the EPA Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA).
How many toxic release facilities are in Cass? ▼
Cass, MI has 6 TRI-reporting facilities on record with the EPA Toxic Release Inventory, with a combined total of 6.2K lbs in reported toxic releases. TRI facilities self-report annual chemical release data to the EPA.
What is the air quality in Cass? ▼
In 2024, Cass, MI recorded a median AQI of 42 and a peak AQI of 108. 82% of monitored days had "Good" air quality (AQI 0–50). Source: EPA Air Quality System (AQS) Annual AQI by County.
Is the drinking water safe in Cass? ▼
Cass, MI has 11 EPA-regulated water systems. 3 systems have reported health-based violations (MCL exceedances). A past violation does not necessarily mean water is currently unsafe. For current water quality, contact your local water utility. Source: EPA SDWIS.
What environmental agencies cover Cass? ▼
Environmental compliance in Cass, Michigan is overseen by the U.S. Environmental Protection Agency (EPA) at the federal level and the Michigan state environmental agency. Facilities report to the EPA Toxic Release Inventory, water systems are regulated under the Safe Drinking Water Act, and contaminated sites are managed under the Superfund program. Contact your state environmental agency for local concerns.

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.

Related Guides

Understanding EPA Data
How EPA collects and publishes environmental data
Environmental Justice
Who lives near polluters and environmental hazards
How to Check Environmental Quality
Step-by-step guide to checking your local environment

Read our methodology - how this data is sourced, computed, and verified.

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Data sourced from U.S. EPA environmental datasets. See our methodology for details. Retrieved and formatted by PlainEnviro