Madison, IL

Compiled by PlainEnviro Editorial, Environmental Data Editorial Team · July 13, 2026

High Risk (61/100)

A PlainEnviro-computed score from reported facility/violation counts, not an official EPA rating, health forecast, or population-adjusted rate. See methodology. This is a different measure than the EJ Screening score for this county, which ranks it by percentile against every other tracked county rather than against fixed national thresholds.

Environmental data for Madison in Illinois · Population: 264,631

Madison, IL is tracked across three EPA datasets covering 25 Toxics Release Inventory (TRI) facilities, 84 Safe Drinking Water Act systems, and 0 Superfund National Priorities List sites. Together these generate an environmental burden score of 61/100 (High Risk), calibrated against national distributions for facility density, chemical release volume, Superfund concentration, and water-system health violations.

Industrial disclosures inside the county total 30.8M lbs of reported toxic releases under EPCRA Section 313, while 18 water systems carry an active health-based violation in the SDWIS record. EPA Air Quality System monitors logged a median AQI of 49 and a peak AQI of 165 in 2024, with 53% 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.

Population

264,631

TRI Facilities

Water Systems

Superfund Sites

Total Releases

30.8M 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)	Unhealthy	Median AQI	Max AQI
2024	193 (53%)	167	4	2	49	165
2023	113 (31%)	234	14	2	55	155
2022	134 (37%)	220	9	0	54	147
2021	82 (22%)	277	6	0	57	143
2020	129 (35%)	233	3	0	54	112

2024 Good Air Quality: 53% of days

Unhealthy days: 6

Median AQI: 49

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 Illinois, see the EPA's AirNow.gov.

Water Systems (84)

System	City	Source	Population	Violations	Health
IL AMERICAN-CHAMPAIGN	Godfrey	Groundwater	150,000	0	–
IL AMERICAN-PEORIA	Godfrey	Surface Water	137,575	2	Yes
IL AMERICAN-EAST ST LOUIS	Godfrey	Surface Water	131,368	1	Yes
IL AMERICAN-WEST SUBURBAN	Godfrey	Surface Water	73,978	0	–
IL AMERICAN-ALTON	Godfrey	Surface Water	46,127	0	–
IL AMERICAN-PEKIN	Godfrey	Groundwater	31,731	0	–
COLLINSVILLE	Collinsville	Groundwater	29,500	0	–
IL AMERICAN-GRANITE CITY	Godfrey	Surface Water	27,549	0	–
EDWARDSVILLE	Edwardsville	Groundwater	26,808	0	–
IL AMERICAN-HOMER TOWNSHIP	Godfrey	Surface Water	24,543	0	–
IL AMERICAN-STREATOR	Godfrey	Surface Water	19,000	0	–
TROY	Troy	Groundwater	16,962	1	Yes
BETHALTO	Bethalto	Groundwater	15,210	0	–
IL AMERICAN-LINCOLN	Godfrey	Surface Water	15,200	5	Yes
IL AMERICAN-STERLING	Godfrey	Groundwater	14,782	0	–
GLEN CARBON	Glen Carbon	Surface Water	12,618	0	–
IL AMERICAN-PONTIAC	Godfrey	Surface Water	11,864	0	–
IL AMERICAN-CHICAGO SUBURBAN	Godfrey	Surface Water	11,187	0	–
HIGHLAND	Highland	Surface Water	10,649	0	–
WOOD RIVER	Wood River	Groundwater	10,464	0	–
MARYVILLE	Maryville	Groundwater	10,150	0	–
IL AMERICAN-JERSEYVILLE	Godfrey	Groundwater	8,737	0	–
FOSTERBURG PWD	Alton	Surface Water	7,940	0	–
IL AMERICAN-SOUTH BELOIT	Godfrey	Groundwater	7,893	0	–
IL AMERICAN-VALLEY VIEW	Godfrey	Surface Water	6,721	0	–
IL AMERICAN-DUPAGE UTILITY	Godfrey	Surface Water	6,613	0	–
EAST ALTON	East Alton	Groundwater	5,786	0	–
MITCHELL PWD	Granite City	Surface Water	5,253	0	–
IL AMERICAN-FERNWAY	Godfrey	Surface Water	5,223	0	–
NORTH EAST CENTRAL PWD	Edwardsville	Groundwater	3,975	0	–
IL AMERICAN-TOLONO	Godfrey	Groundwater	3,604	6	Yes
THREE COUNTY PWD	New Douglas	Surface Water	3,575	0	–
PONTOON BEACH PWD	Granite City	Surface Water	3,325	0	–
IL AMERICAN-LIBERTY RIDGE WEST	Godfrey	Surface Water	3,307	1	Yes
HOLIDAY SHORES SD	Edwardsville	Surface Water	2,840	4	Yes
SOUTHERN IL UNIVERSITY-EDWARDSVILLE	Edwardsville	Groundwater	2,817	0	–
IL AMERICAN-VILLA GROVE	Godfrey	Groundwater	2,467	1	Yes
IL AMERICAN-FARMINGTON	Godfrey	Groundwater	2,448	1	Yes
IL AMERICAN-FISHER	Godfrey	Groundwater	2,026	0	–
IL AMERICAN-WAYCINDEN	Godfrey	Surface Water	1,934	0	–
ST JACOB	St. Jacob	Surface Water	1,835	2	Yes
IL AMERICAN-CAIRO	Godfrey	Groundwater	1,821	0	–
MEADOWBROOK PWD	Bethalto	Groundwater	1,778	0	–
GRANTFORK	Highland	Surface Water	1,766	1	Yes
IL AMERICAN-ARROWHEAD	Godfrey	Surface Water	1,581	0	–
ROXANA	Roxana	Groundwater	1,509	0	–
IL AMERICAN-MOUNT PULASKI	Godfrey	Groundwater	1,506	2	Yes
MOUND PWD	Collinsville	Groundwater	1,500	2	Yes
IL AMERICAN-ROSICLARE	Godfrey	Surface Water	1,387	2	Yes
IL AMERICAN-HARDIN COUNTY	Godfrey	Groundwater	1,373	0	–
IL AMERICAN-WASHINGTON ESTATES	Godfrey	Groundwater	1,278	0	–
HARTFORD	Hartford	Groundwater	1,260	0	–
IL AMERICAN-ARBURY	Godfrey	Groundwater	1,225	0	–
IL AMERICAN-GLASFORD	Godfrey	Groundwater	1,193	0	–
IL AMERICAN-ANDALUSIA	Godfrey	Groundwater	1,184	0	–
IL AMERICAN-VALLEY MARINA	Godfrey	Groundwater	1,102	0	–
WORDEN	Worden	Surface Water	1,096	2	Yes
HAMEL	Hamel	Surface Water	1,087	0	–
MARINE	Marine	Surface Water	1,037	0	–
IL AMERICAN-COUNTRY CLUB	Godfrey	Surface Water	1,014	0	–
IL AMERICAN-HARDIN	Godfrey	Groundwater	839	1	Yes
IL AMERICAN-LIVINGSTON	Godfrey	Surface Water	825	0	–
ALHAMBRA	Alhambra	Surface Water	755	0	–
MORO PWD	Moro	Groundwater	723	0	–
IL AMERICAN-ALPINE HEIGHTS	Godfrey	Surface Water	707	0	–
IL AMERICAN-TERRA COTTA	Godfrey	Groundwater	681	0	–
IL AMERICAN-LOMBARD HEIGHTS	Godfrey	Surface Water	679	0	–
IL AMERICAN-SAUNEMIN	Godfrey	Groundwater	456	0	–
IL AMERICAN-MORELAND	Godfrey	Surface Water	445	0	–
MERIDIAN VILLAGE	Glen Carbon	Surface Water	339	0	–
IL AMERICAN-BROADLANDS	Godfrey	Groundwater	330	3	Yes
IL AMERICAN-LIBERTY RIDGE EAST	Godfrey	Surface Water	320	0	–
IL AMERICAN-NETTLE CREEK	Godfrey	Groundwater	317	0	–
IL AMERICAN-ROLLINS	Godfrey	Groundwater	231	2	Yes
IL AMERICAN-RIDGECREST	Godfrey	Groundwater	203	0	–
QUAIL RUN MOBILE HOME PARK	Edwardsville	Groundwater	168	0	–
COUNTRY HILLS WTR, INC.	Highland	Surface Water	166	0	–
IL AMERICAN-MIDWEST PALOS	Godfrey	Groundwater	132	0	–
IL AMERICAN-CENTRAL STATES DST	Godfrey	Groundwater	117	0	–
IL AMERICAN-LEONORE	Godfrey	Groundwater	111	0	–
IL AMERICAN-HOLLIS	Godfrey	Groundwater	107	0	–
IL AMERICAN-RIVER GRANGE	Godfrey	Groundwater	62	0	–
SPRING LAKE SUBDIVISION	Troy	Groundwater	25	0	–
IL AMERICAN-LAKE WATER COMPANY	Godfrey	Surface Water	0	0	–

TRI Facilities (25)

#	Facility	City	Industry	Total Releases
1	Wood River Refinery	Roxana	Petroleum	13.5M lbs
2	U.S. Steel Granite City Works	Granite City	Primary Metals	9.7M lbs
3	Wieland Rolled Products N.a. - East Alton Casting P	East Alton	Primary Metals	3.1M lbs
4	Alton Steel Inc	Alton	Primary Metals	2.0M lbs
5	Gateway Energy & Coke Co	Granite City	Petroleum	634.0K lbs
6	Olin Winchester LLC Main Plant	East Alton	Fabricated Metals	529.5K lbs
7	Amsted Rail Co Inc	Granite City	Primary Metals	375.0K lbs
8	Precoat Metals	Granite City	Fabricated Metals	340.1K lbs
9	Wieland Rolled Products N.a. - East Alton Main Plan	East Alton	Primary Metals	224.6K lbs
10	Prairie Farms Dairy Inc	Granite City	Food	223.9K lbs
11	Green Plains Madison LLC	Madison	Chemicals	40.0K lbs
12	Trouw Nutrition USA LLC	Highland	Food	28.2K lbs
13	Phillips 66 Terminal	Hartford	Petroleum Bulk Terminals	23.5K lbs
14	Mayco Manufacturing LLC	Granite City	Fabricated Metals	9.0K lbs
15	Heidtman Steel Products Inc.	Granite City	Fabricated Metals	7.2K lbs
16	Midwest Metal Coatings	Granite City	Fabricated Metals	7.0K lbs
17	Airgas Specialty Products - Granite City	Granite City	Chemical Wholesalers	4.2K lbs
18	Granite City Pickling & Warehousing Inc.	Granite City	Fabricated Metals	3.7K lbs
19	Eaton Highland	Highland	Fabricated Metals	302 lbs
20	Premcor Hartford Distribution Center	Hartford	Petroleum Bulk Terminals	129 lbs
21	Stein LLC	Granite City	Hazardous Waste	53 lbs
22	Magnesium Elektron Na Inc Madison	Madison	Primary Metals	14 lbs
23	Ardent Mills LLC	Alton	Food	0 lbs
24	St Louis Screw & Bolt	Madison	Fabricated Metals	0 lbs
25	Gateway Packaging Co	Granite City	Printing	0 lbs

Cities in Madison (7)

Alton

Pop: -

2 facilities · 1 water

East Alton

Pop: -

3 facilities · 1 water

Granite City

Pop: -

12 facilities · 2 water

Hartford

Pop: -

2 facilities · 1 water

Madison

Pop: -

3 facilities · 0 water

Roxana

Pop: -

1 facilities · 1 water

Highland

Pop: -

2 facilities · 3 water

Frequently Asked Questions

What is the environmental risk level in Madison, Illinois? ▼

Madison, IL has an environmental risk score of 61/100 (High Risk), based on 25 TRI facilities, 0 Superfund sites, and 84 water systems on record. 18 water systems have health-based violations. Source: EPA TRI, SDWIS, and Superfund NPL.

Are there Superfund sites in Madison? ▼

No Superfund National Priorities List (NPL) sites are currently registered in Madison, IL in the EPA database.

How many toxic release facilities are in Madison? ▼

Madison, IL has 25 TRI-reporting facilities on record with the EPA Toxic Release Inventory, with a combined total of 30.8M lbs in reported toxic releases. TRI facilities self-report annual chemical release data to the EPA.

What is the air quality in Madison? ▼

In 2024, Madison, IL recorded a median AQI of 49 and a peak AQI of 165. 53% 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 Madison? ▼

Madison, IL has 84 EPA-regulated water systems. 18 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 Madison? ▼

Environmental compliance in Madison, 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.

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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 Editorial