What is the Munimetric score for Illinois?

Munimetric assigns a state-level average MISI score based on the individual scores of all covered community water systems in Illinois. The state average, band distribution, and market-level rankings are shown on this page. Higher MISI values indicate greater structural stress.

Which water systems in Illinois face the most infrastructure stress?

The state page ranks the highest-stress systems in Illinois by MISI score. Stress reflects operational burden, capital gaps, revenue fragility, rate affordability constraints, and governance risk, not a single compliance event. The headline remains a blended structural stress composite rather than a pure physical-condition index. Workflow actions remain reserved for account access.

How does Illinois compare to other states for drinking water infrastructure risk?

Illinois is compared against all 50 states and territories using average MISI score, market count, and band distribution. Munimetric tracks nationwide coverage across 9,000+ scored service markets.

Are there lead pipe or corrosion-related concerns in Illinois water systems?

Where lead and copper rule compliance data is available from EPA SDWA records, Munimetric factors it into the Operational Stress family score. Specific lead service line inventories vary by system. Individual system profiles contain the most detailed compliance context available.

Does Munimetric include PFAS monitoring context for Illinois water systems?

Munimetric summarizes stored PFAS monitoring context where public contaminant-monitoring records are available. Missing PFAS summaries remain missing records, not non-detections, and this public-record layer does not change the MISI score by itself.

What compliance signals are active in Illinois?

Munimetric tracks signals such as compliance escalation, monitoring and reporting failures, population decline, income erosion, data staleness, and parent-government fiscal stress across Illinois water systems.

Does Munimetric track boil water advisories in Illinois?

Munimetric does not track real-time boil water advisories. For current advisories, contact your local water utility or state drinking water program. Munimetric monitors structural conditions that provide context around system reliability over time.

How many covered systems in Illinois have recent recorded drinking-water violations?

Stored public records show 313 covered systems with recent drinking-water violations, with 2,271 recorded violations across 452 covered systems in the recent 3 years window.

How does Munimetric summarize PFAS public-record context in Illinois?

Stored contaminant-monitoring summaries are present for 438 covered systems; 179 systems have PFAS detection context in this state summary.

How does Munimetric summarize lead & copper context in Illinois?

Stored lead & copper summaries are present for 447 covered systems; 261 systems have violation or action-level context in this state summary.

What source-water types are represented across covered Illinois systems?

Stored identity records group covered Illinois systems by source-water type: Surface water: 273, Groundwater: 179.

Where can I find official drinking-water records for Illinois?

The Official records drawer lists Public drinking-water profile, Contaminant monitoring records links where currently available for Illinois.

Is this a real-time statewide tap-water condition rating?

No. This is not a real-time tap-water condition determination. Munimetric summarizes stored public-record context for research and navigation, and this layer does not change MISI.

States / Illinois

Illinois

Name: Illinois Drinking Water Infrastructure Stress Data
Creator: Munimetric
License: https://munimetric.com/terms

Statewide Munimetric profile for Illinois, covering drinking-water market scores, signal activity, infrastructure stress context, and population insights across 452 scored service markets serving approximately 11.0 million people. This state profile highlights what is happening and why it matters using water-system, fiscal, capital, and signal context.

Illinois has an average MISI infrastructure stress score of 27.8/100 in the Watch band as of 2026-08-25. Public records summarize recent drinking-water violations, PFAS monitoring records, lead and copper context, and source-water mix across 452 covered systems. Updated May 2026.

National context

States sized by scored-market count. Color reflects average stress band.

452Markets scored

27.8Headline composite

~11.0MPop. served

2156Active signals

Band distribution (MISI)

State headline composite

Component of current headline composite

Infrastructure Stress20.7 / 100

Physical, compliance, and capital-execution pressure reflected in the blended headline composite.

Socioeconomic Stress7.1 / 100

Affordability, demand-base, and parent-government fiscal pressure reflected in the blended headline composite.

Observability Stress0.0 / 100

Staleness, disclosure freshness, and reporting-visibility effects reflected in the blended headline composite.

27.8 headline compositeIllinois state composite452 markets~11.0M people served

State interpretation guide

How to read Illinois headline composite

Plain-language summary

Illinois currently shows an average MISI headline composite of 27.8 versus a national average of 24.4. In v0.1.2, the headline composite remains a blended structural stress measure rather than a pure physical-condition index. A frozen national reference and a 50 percent single-factor cap reduce the dominance of near-universal and very rare factors, while the component bars continue to separate infrastructure, socioeconomic, and observability readings.

Why this page stands out

452 scored systems are included in this state view, with explicit confidence and source-backed context.
State posture is benchmarked against national averages, not evaluated in isolation.
Top system links below connect state-level findings directly to profile-level diagnostics.

What to do next

Review the executive context to understand the state-level pressure pattern.
Open top system profiles to inspect what is actually driving stress at market level.
Use saved monitoring after research access is enabled to follow high-stress systems over time.

Priority Illinois paths

Public record layer

Statewide Water Quality Context

Stored public-record context for recent drinking-water violations, contaminant monitoring, and source-water mix across covered systems. This is not a tap-water safety determination and does not change the MISI score.

Systems with recent violations

313 of 452Systems with recent public violation rows.

Source-water mix452 systems

Surface water273
Groundwater179
Purchased water0
Mixed source0
Not stored0

Latest identity snapshot: Jun 30, 2026

Coverage

Violation, enforcement, and compliance-burden counts use the recent 3 years window for dated stored records.
Drinking-water identity snapshots are stored for 447 of 452 included scored systems.
PFAS monitoring summary records are stored for 438 of 452 included systems; missing records are not treated as non-detections.
Lead and copper summary records are stored for 447 of 452 included systems; missing records are not treated as absence of lead/copper context.

Water quality questionsDefinitions and public-record context

How many covered systems in Illinois have recent recorded drinking-water violations?: Stored public records show 313 covered systems with recent drinking-water violations, with 2,271 recorded violations across 452 covered systems in the recent 3 years window.
How does Munimetric summarize PFAS public-record context in Illinois?: Stored contaminant-monitoring summaries are present for 438 covered systems; 179 systems have PFAS detection context in this state summary.
How does Munimetric summarize lead & copper context in Illinois?: Stored lead & copper summaries are present for 447 covered systems; 261 systems have violation or action-level context in this state summary.
What source-water types are represented across covered Illinois systems?: Stored identity records group covered Illinois systems by source-water type: Surface water: 273, Groundwater: 179.
Where can I find official drinking-water records for Illinois?: The Official records drawer lists Public drinking-water profile, Contaminant monitoring records links where currently available for Illinois.
Is this a real-time statewide tap-water condition rating?: No. This is not a real-time tap-water condition determination. Munimetric summarizes stored public-record context for research and navigation, and this layer does not change MISI.

Official records

Public drinking-water profileEPA ECHO: Federal drinking-water dashboard and public-record search entry point.
Contaminant monitoring recordsEPA UCMR: Federal contaminant-monitoring program reference and public data entry point.

Methodology/source notes

Methodology/source notesDisplayed from stored public drinking-water records and official program references. This layer does not change MISI.
Enforcement historyEPA ECHO / SDWIS: Violation and enforcement counts are aggregated from stored public compliance records across covered systems.
Contaminant monitoring recordsEPA UCMR: PFAS context uses stored contaminant-monitoring summaries where available; missing records are not treated as non-detections.
State drinking-water programOfficial link not currently stored for this state program mapping.

Top recent compliance-burden systemsRecent 3 years

System	Population	Source water	Recent violations	Recent enforcement	Public-record flags
SaukIL0312790	9,921	Groundwater	162	243	recent violations recorded, recent enforcement history, recent monitoring/reporting failures, PFAS detections in stored records
SilvisIL1610700	7,473	Surface water	65	213	recent violations recorded, recent enforcement history, recent monitoring/reporting failures, PFAS detections in stored records, lead/copper context
Richton ParkIL0312550	12,504	Groundwater	63	170	recent violations recorded, recent enforcement history, recent monitoring/reporting failures, PFAS detections in stored records, lead/copper context
WaterlooIL1330300	10,190	Groundwater	58	62	recent violations recorded, recent enforcement history, recent monitoring/reporting failures, PFAS detections in stored records, lead/copper context
Rend Lake Inter-City Water SystemIL0555100	3,650	Surface water	51	106	recent violations recorded, recent enforcement history, recent monitoring/reporting failures, lead/copper context
RobbinsIL0312700	5,415	Surface water	46	73	recent violations recorded, recent enforcement history, recent monitoring/reporting failures
StauntonIL1171050	5,756	Surface water	46	13	recent violations recorded, recent enforcement history, recent monitoring/reporting failures, PFAS detections in stored records, lead/copper context
Arlington HeightsIL0314030	73,320	Surface water	46	13	recent violations recorded, recent enforcement history, recent monitoring/reporting failures

This is not a real-time tap-water condition determination. For current advisories or health guidance, consult the utility or state drinking-water program.

Executive context

What This Page Shows

452 of the community drinking-water systems in Illinois are currently scored. Analytics below are calculated from this covered subset only. Covered systems serve approximately 11.0M people.

What the Data Suggests

Illinois has 452 scored service markets in the Munimetric coverage set, covering roughly 11.0 million residents in total. At the latest reading, the state-level average lands at 27.8 out of 100, indicating early but meaningful signs of structural stress in aggregate. A relatively small share — roughly 8% — currently sit in elevated-stress bands.

Across state markets, Operational Stress stands out as the dominant contributor to headline stress (12.7 points average), with Capex Pressure a distant second at 8.0. That pattern suggests a particular kind of pressure — concentrated rather than broadly distributed.

2156 active signals are recorded across state markets. The most prevalent is High-AGI Out-Migration, affecting 417 markets.

State-level average stress has been relatively steady between recent observation periods, suggesting the current picture reflects persistent conditions rather than a sudden shift.

This summary is based on structured, source-backed public data and is intended for research and monitoring only. It is not investment advice, a credit opinion, or municipal advisory guidance.

Recent Movement

Latest average MISI is 27.8 as of Aug 25, 2026. Movement since Aug 24, 2026 is flat.

Compact summary from 101 stored state observations.

State Family Contribution Summary

Operational Stress12.7 / 20.0

Capex Pressure8.0 / 20.0

Revenue Fragility6.8 / 20.0

Governance Risk0.3 / 20.0

Rate Constraint0.1 / 20.0

Signals

Signal Frequency

Signal	Severity	Markets affected	% of scored
High-AGI Out-Migration	high	417	92%
Climate Hazard Exposure	high	415	92%
Compliance Escalation	high	354	78%
Lead & Copper Rule Risk	high	261	58%
PFAS Contamination Risk	high	179	40%
Housing Market Weakness	medium	168	37%
Monitoring / Reporting Failures	medium	121	27%
Population Served Decline	high	116	26%
Infrastructure Capital Gap	high	73	16%
Parent-Government Fiscal Stress	medium	36	8%
Current Drought Severity	medium	8	2%
Income Erosion	medium	4	1%
Utility Data Staleness	high	4	1%

Markets

Top Markets

#	Market	Score	Band	Population	Signals
1	Chicago	49.4	Fragile	2.7M	7
2	Lemont	49.2	Fragile	18K	7
3	Murphysboro	48.7	Fragile	1	8
4	Coal City	48.2	Fragile	6K	7
5	Highland	46.9	Fragile	11K	8
6	Red Bud	46.8	Fragile	4K	8
7	Elgin	46.7	Fragile	115K	8
8	Richton Park	46.1	Fragile	13K	7
9	Benton	46.0	Fragile	4K	7
10	Carbondale	45.9	Fragile	22K	7
11	Park Forest	45.6	Fragile	22K	7
12	Steger	45.2	Fragile	10K	6
13	Glenview	44.7	Fragile	48K	6
14	Batavia	44.5	Fragile	26K	8
15	Chester	44.4	Fragile	8K	8
16	Troy	44.1	Fragile	17K	7
17	Calumet City	44.1	Fragile	37K	7
18	Dixmoor	44.1	Fragile	3K	7
19	Joliet	44.0	Fragile	160K	7
20	La Salle	44.0	Fragile	10K	7

Comparison

State Comparison

National average: 24.4

Rank	State	Avg Score	Band	Markets	Delta vs State
14	Oregon	28.0	Watch	115	+0.2
15	Florida	27.9	Watch	391	+0.1
16	Illinois	27.8	Watch	452	+0.0
17	Ohio	27.3	Watch	332	-0.5
18	South Carolina	26.9	Watch	155	-0.9

Analytical posture

State Stress Analytics

Score Distribution

Distribution of scored market scores with the state average overlay.

452 markets plotted.

Stress vs Population

Each point is a scored market; tooltip reveals market-level context.

451 markets plotted.

Population View

People served by community water systems in Illinois, colored by stress band.

~11.0M people served by 452 systems in Illinois

Stable

Watch

Fragile

High Stress

Critical

452 scored systems · colored by stress band

Peer Constellation

Select a market to see its nearest peers by score similarity.

Center market:

24 nearest peers by score distance.

Score Trend

Latest

27.8

Trend

+20.7

Observations

101

Extended layers

Advanced State Context

Priority views, detailed registers, and methodology supporting the analytical core above.

Markets & signals

Priority Views

#	Market	Score	Band	Population	Signals
1	Chicago	49.4	Fragile	2.7M	7
2	Lemont	49.2	Fragile	18K	7
3	Murphysboro	48.7	Fragile	1	8
4	Coal City	48.2	Fragile	6K	7
5	Highland	46.9	Fragile	11K	8
6	Red Bud	46.8	Fragile	4K	8
7	Elgin	46.7	Fragile	115K	8
8	Richton Park	46.1	Fragile	13K	7
9	Benton	46.0	Fragile	4K	7
10	Carbondale	45.9	Fragile	22K	7
11	Park Forest	45.6	Fragile	22K	7
12	Steger	45.2	Fragile	10K	6
13	Glenview	44.7	Fragile	48K	6
14	Batavia	44.5	Fragile	26K	8
15	Chester	44.4	Fragile	8K	8
16	Troy	44.1	Fragile	17K	7
17	Calumet City	44.1	Fragile	37K	7
18	Dixmoor	44.1	Fragile	3K	7
19	Joliet	44.0	Fragile	160K	7
20	La Salle	44.0	Fragile	10K	7

Detailed records

Registers

#	Market	Score	Band	Population	Signals
1	Chicago	49.4	Fragile	2.7M	7
2	Lemont	49.2	Fragile	18K	7
3	Murphysboro	48.7	Fragile	1	8
4	Coal City	48.2	Fragile	6K	7
5	Highland	46.9	Fragile	11K	8
6	Red Bud	46.8	Fragile	4K	8
7	Elgin	46.7	Fragile	115K	8
8	Richton Park	46.1	Fragile	13K	7
9	Benton	46.0	Fragile	4K	7
10	Carbondale	45.9	Fragile	22K	7
11	Park Forest	45.6	Fragile	22K	7
12	Steger	45.2	Fragile	10K	6
13	Glenview	44.7	Fragile	48K	6
14	Batavia	44.5	Fragile	26K	8
15	Chester	44.4	Fragile	8K	8
16	Troy	44.1	Fragile	17K	7
17	Calumet City	44.1	Fragile	37K	7
18	Dixmoor	44.1	Fragile	3K	7
19	Joliet	44.0	Fragile	160K	7
20	La Salle	44.0	Fragile	10K	7

Munimetric tracks infrastructure stress across 452 community drinking-water systems in Illinois, covering compliance conditions, capital needs, revenue and rate pressure, and governance risk. Use this page to research which systems face the highest structural stress and how Illinois compares nationally.

Which water systems in Illinois face the most infrastructure stress?: The highest-stress systems in Illinois are ranked by MISI score above. Stress reflects operational burden, capital gaps, revenue fragility, rate affordability constraints, and governance risk—not a single compliance event. In v0.1.2, the headline composite remains a blended structural stress measure rather than a pure physical-condition index. A frozen national reference and a 50 percent single-factor cap reduce the dominance of near-universal and very rare factors, while the component bars continue to separate infrastructure, socioeconomic, and observability readings.
How does Illinois compare to other states for drinking water infrastructure risk?: Illinois is compared against all 50 states and territories using average MISI score, market count, and band distribution. The state comparison table above shows where Illinois ranks nationally and how its average score compares.
Are there lead pipe or corrosion-related concerns in Illinois water systems?: Where lead and copper rule compliance data is available from EPA SDWA records, Munimetric factors it into the Operational Stress family. Specific lead service line inventories vary by system. Individual system profiles contain the most detailed compliance context available.
What compliance signals are active in Illinois?: Munimetric tracks signals such as compliance escalation, monitoring and reporting failures, data staleness, and financial stress indicators across Illinois systems. The signal frequency table above summarizes which signals are most prevalent statewide.
Does Munimetric track boil water advisories in Illinois?: Munimetric does not track real-time boil water advisories. For current advisories, contact your local water utility or state drinking water program. Munimetric monitors structural conditions—compliance posture, infrastructure stress, and governance risk—that provide broader context around system reliability.

Keep monitoring this state

Research access covers saved monitoring, alerts, recurring briefs, and team review.

Get the Water Stress Brief Request research access

Water Infrastructure in Illinois

Munimetric tracks infrastructure stress across 452 community drinking-water systems in Illinois. Each system receives a Munimetric Infrastructure Stress Index (MISI) score from 0 to 100, calculated across five risk families: Operational Stress, Capex Pressure, Revenue Fragility, Rate Constraint, and Governance Risk. Higher scores indicate more structural stress. Scores are source-backed and deterministic, drawing from EPA SDWA compliance records, American Community Survey demographic and economic data, FEMA National Risk Index hazard profiles, and state financial disclosures.

State-level monitoring shows which systems face the highest structural stress, how Illinois compares against other states nationally, and which monitoring signals are most active across the state. Each individual system profile includes compliance history, score family drivers, peer rankings within population-based cohorts where safeguards pass, and public source context. Full provenance cards and source workbench views remain workflow-gated. Munimetric covers community water systems across all 50 states and territories. This is structural risk research—not a water quality rating, advisory feed, or credit rating. Updated May 2026.

The statewide public-record layer adds drinking-water violation categories, PFAS monitoring summaries where stored, lead and copper context, source-water mix, and official record links across covered systems. These records help explain water-system context alongside infrastructure stress without turning Munimetric into a tap-water safety determination.

What is the Munimetric score for Illinois?: Munimetric assigns a state-level average MISI score based on the individual scores of all covered community water systems in Illinois. The state average, band distribution, and market-level rankings are shown on this page. Higher MISI values indicate greater structural stress.
Which water systems in Illinois face the most infrastructure stress?: The state page ranks the highest-stress systems in Illinois by MISI score. Stress reflects operational burden, capital gaps, revenue fragility, rate affordability constraints, and governance risk, not a single compliance event. The headline remains a blended structural stress composite rather than a pure physical-condition index. Workflow actions remain reserved for account access.
How does Illinois compare to other states for drinking water infrastructure risk?: Illinois is compared against all 50 states and territories using average MISI score, market count, and band distribution. Munimetric tracks nationwide coverage across 9,000+ scored service markets.
Are there lead pipe or corrosion-related concerns in Illinois water systems?: Where lead and copper rule compliance data is available from EPA SDWA records, Munimetric factors it into the Operational Stress family score. Specific lead service line inventories vary by system. Individual system profiles contain the most detailed compliance context available.
Does Munimetric include PFAS monitoring context for Illinois water systems?: Munimetric summarizes stored PFAS monitoring context where public contaminant-monitoring records are available. Missing PFAS summaries remain missing records, not non-detections, and this public-record layer does not change the MISI score by itself.
What compliance signals are active in Illinois?: Munimetric tracks signals such as compliance escalation, monitoring and reporting failures, population decline, income erosion, data staleness, and parent-government fiscal stress across Illinois water systems.
Does Munimetric track boil water advisories in Illinois?: Munimetric does not track real-time boil water advisories. For current advisories, contact your local water utility or state drinking water program. Munimetric monitors structural conditions that provide context around system reliability over time.