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Clark, IL

Low Risk (25/100)

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 Clark in Illinois · Population: 15,328

TRI sites such as Zf Active Safety & Electronics US LLC; Id Castings; SDWIS systems such as CLARK-EDGAR RWD; MARSHALL; CASEY; NPL sites such as Velsicol Chemical Corp. (Marshall Plant) anchor Clark, IL's EPA extract. Derived burden score 25/100 (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 Clark include CASEY; WESTFIELD, while Zf Active Safety & Electronics US LLC leads reported TRI pounds among local Form R filers. AQS median AQI 36 / peak 90 in 2024.

Burden score 25/100 (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 Clark -- 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 Clark, IL: EPA TRI 2023 reporting year

2022 → 2023

Same facilities, both years

-21.4%

2 facilities that filed in 2022 and 2023

Whole inventory

-21.4%

4.2 thousand lb → 3.3 thousand lb, every facility that filed

  • Clark, IL's total reported releases fell from 4.2 thousand lb in 2022 to 3.3 thousand lb in 2023, based on EPA TRI filings.
  • Clark, IL's off-site transfers fell from 1.5 thousand lb in 2022 to 1.2 thousand lb in 2023, based on EPA TRI filings.
  • Clark, IL's air releases fell from 2.7 thousand lb in 2022 to 2.1 thousand lb in 2023, based on EPA TRI filings.
County population (Census ACS)
15,328
TRI Facilities
2
Water Systems
6
Superfund Sites
1
Total Releases
19.2K 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 332 (91%) 31 0 90
2023 320 (89%) 33 5 136
2022 296 (95%) 15 1 101
2021 344 (95%) 19 0 84
2020 347 (96%) 16 0 97
2024 Good Air Quality: 91% of days
Median AQI: 36

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 Illinois, see the EPA's AirNow.gov.

Water Systems (6)

System System pop (SDWIS) Violations
CLARK-EDGAR RWD 9,657 0
MARSHALL 3,947 0
CASEY 3,274 8
MARTINSVILLE 1,200 0
WESTFIELD 678 4
UNION-YORK WATER DISTRICT 600 0

TRI Facilities (2)

# Facility Total Releases
1 Zf Active Safety & Electronics US LLC 11.6K lbs
2 Id Castings 7.6K lbs

Superfund Sites (1)

Site Name Status HRS Score
Velsicol Chemical Corp. (Marshall Plant) NPL Site 48.78

Cities in Clark (5)

Marshall
1 facilities · 2 water
Martinsville
1 facilities · 1 water
Casey
0 facilities · 1 water
West Union
0 facilities · 1 water
Westfield
0 facilities · 1 water

Frequently Asked Questions

What is the environmental risk level in Clark, Illinois? ▼
Clark, IL has an environmental risk score of 25/100 (Low Risk), based on 2 TRI facilities, 1 Superfund sites, and 6 water systems on record. 2 water systems have health-based violations. Source: EPA TRI, SDWIS, and Superfund NPL.
Are there Superfund sites in Clark? ▼
Yes, Clark, IL 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 Clark? ▼
Clark, IL has 2 TRI-reporting facilities on record with the EPA Toxic Release Inventory, with a combined total of 19.2K lbs in reported toxic releases. TRI facilities self-report annual chemical release data to the EPA.
What is the air quality in Clark? ▼
In 2024, Clark, IL recorded a median AQI of 36 and a peak AQI of 90. 91% 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 Clark? ▼
Clark, IL has 6 EPA-regulated water systems. 2 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 Clark? ▼
Environmental compliance in Clark, Illinois is overseen by the U.S. Environmental Protection Agency (EPA) at the federal level and the Illinois 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