Water Quality in Illinois City, IL: 5 Violations — Grade C
Grade C · Score 60/100 · 1 water system · Updated 2026-05-03
Illinois City's water has moderate compliance issues. Residents in affected areas should consider filtration.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-05-03
Water systems in Illinois City, IL have accumulated 5 EPA violations across the full compliance record — a dataset that captures reportable health-based exceedances, monitoring lapses, and enforcement actions filed with the federal Safe Drinking Water Information System.
Water Quality by ZIP Code in Illinois City
Water quality varies across Illinois City's 1 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 61259 | C | 60 | 5 | 0 | View report → |
Water Quality Overview
Illinois City, Illinois receives a water quality grade of C with an overall score of 60 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 1 water system serving Illinois City have accumulated 5 EPA violations (all monitoring/reporting type). These violations are tracked across 1 ZIP codes serving approximately 53 people.
What Grade C Means
A grade of C indicates moderate compliance issues. Illinois City's water systems have some violations that warrant attention. While the water may still be safe for most people, residents in affected ZIP codes should consider additional testing or filtration.
Lead Levels
The average 90th percentile lead level across Illinois City water systems is 0.0008 mg/L — within EPA limits. No ZIP codes exceed the EPA lead action level.
With 67% of homes built before 1986, Illinois City has a higher-than-average risk of lead from older plumbing. Lead solder was banned in 1986, and homes built before this date may have lead in pipes, solder joints, or fixtures.
Radon Risk
Illinois City is in EPA Radon Zone 1 (High risk). The EPA recommends all homes in Zone 1 areas be tested for radon. Radon is the second leading cause of lung cancer after smoking.
Water Systems Serving Illinois City
Illinois City is served by 1 community water system regulated under the Safe Drinking Water Act. These systems collectively serve approximately 53 people across 1 ZIP codes.
Each water system is identified by a Public Water System ID (PWSID) and is required to:
- Test for over 90 regulated contaminants on a regular schedule
- Report results to the EPA and state regulators
- Issue an annual Consumer Confidence Report (CCR) to all customers
- Take corrective action when violations occur
The EPA has taken 10 enforcement actions against water systems serving Illinois City. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Illinois City
Enter your ZIP code on ZipCheckup to see your specific water system data, including contaminant levels, violation history, and safety scores
Request your CCR — your water utility must provide an annual Consumer Confidence Report with detailed test results for all monitored contaminants
Get a home test — certified kits cost $20–$50 and test for lead, bacteria, and common contaminants. Professional lab tests ($150–$400) cover a broader panel
Consider filtration — NSF-certified filters can remove specific contaminants. Reverse osmosis removes the broadest range; activated carbon is effective for chlorine and many organics
Check for advisories — monitor your local utility website and local news for boil water advisories or system alerts
Contaminants Detected in Illinois City Water Systems
The following contaminants have been detected or caused violations across Illinois City's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Stage 1 DBP Rule | Treatment Technique | N/A | 2 | 1 | No |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 0.08 mg/L | 1 | 1 | No |
| Lead and Copper Rule | Treatment Technique | N/A | 1 | 1 | No |
| Surface Water Treatment Rule | Treatment Technique | N/A | 1 | 1 | No |
MCL = Maximum Contaminant Level (EPA enforceable standard). Health-based violations indicate levels that may pose direct health risks.
EPA Enforcement History
The EPA and state regulators have taken 10 enforcement actions against water systems serving Illinois City. Recent actions:
| Date | Action Type |
|---|---|
| 2025-09-22 | State Informal Action |
| 2024-12-19 | State Informal Action |
| 2024-12-16 | State Order Extension |
| 2024-11-19 | State Informal Action |
| 2024-08-09 | State Order Extension |
| 2024-02-13 | State Order Extension |
| 2023-10-11 | State Informal Action |
| 2023-10-11 | State Informal Enforcement |
| 2022-11-28 | State Informal Action |
| 2022-10-17 | State Informal Action |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2025-09-22.
Illinois City vs. Nearby Illinois Cities
How Illinois City's water quality compares to similar cities in Illinois:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Illinois City | C | 5 | 1 | 53 |
| Buffalo Prairie | D | 0 | 1 | 53 |
| Huntsville | D | 0 | 1 | 47 |
| La Prairie | C | 1 | 1 | 47 |
Common Questions About Illinois City Water
These are the most common questions residents search for about water quality in Illinois City, Illinois:
Is Illinois City water hard or soft? Water hardness varies by source. Illinois City's 1 water system uses a single source. Check your ZIP code report for specific hardness data.
Can I drink Illinois City tap water? Illinois City's water receives a grade of C (60/100). No health-based violations have been recorded, but home testing is always recommended.
What is the best water filter for Illinois City? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Illinois City vs. Illinois Average
Understanding how Illinois City compares to the broader Illinois average helps contextualize your local water quality. Factors like water source, treatment methods, and infrastructure age all contribute to differences between cities in the same state.
To see how individual neighborhoods compare, check the ZIP code reports below — water quality can vary significantly even within Illinois City.
ZIP Codes in Illinois City
Illinois City spans 1 ZIP code. The ZIP with the lowest water quality score is 61259. Each ZIP code has its own water quality profile based on the specific water system serving that area. Check each ZIP code for detailed contaminant data, violation history, and system information.
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
- Enforcement: EPA ECHO database
- Filter recommendations: NSF/ANSI certified products
Updated daily.