Water Quality in Rock City, IL: 2 Violations — Grade F
Grade F · Score 31/100 · 1 water system · Updated 2026-05-03
Rock City's water has serious compliance issues. Independent testing and filtration are strongly recommended.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-05-03
Tracked under the EPA Safe Drinking Water program, Rock City, IL shows 2 water violations on file — findings that span multiple violation categories and are detailed system by system in the data grid further down the page.
Water Quality by ZIP Code in Rock City
Water quality varies across Rock City's 1 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 61070 | F | 31 | 2 | 0 | View report → |
Water Quality Overview
Rock City, Illinois receives a water quality grade of F with an overall score of 31 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 1 water system serving Rock City have accumulated 2 EPA violations (all monitoring/reporting type). These violations are tracked across 1 ZIP codes serving approximately 313 people.
What Grade F Means
A grade of F indicates serious compliance issues. Rock City's water systems have substantial violations. Residents should strongly consider independent water testing and appropriate filtration.
Lead Levels
The average 90th percentile lead level across Rock City water systems is 0.0170 mg/L — this exceeds the EPA action level of 0.015 mg/L. 1 ZIP code exceed the EPA lead action level.
With 85% of homes built before 1986, Rock 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
Rock 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 Rock City
Rock City is served by 1 community water system regulated under the Safe Drinking Water Act. These systems collectively serve approximately 313 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 6 enforcement actions against water systems serving Rock City. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Rock 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 Rock City Water Systems
The following contaminants have been detected or caused violations across Rock City's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Revised Total Coliform Rule | Microbiological | N/A | 1 | 1 | No |
| Stage 1 DBP 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 6 enforcement actions against water systems serving Rock City. Recent actions:
| Date | Action Type |
|---|---|
| 2025-07-29 | State Informal Action |
| 2025-07-29 | State Informal Enforcement |
| 2023-11-08 | State Informal Action |
| 2023-10-16 | State Informal Action |
| 2023-10-16 | State Informal Enforcement |
| 2023-09-25 | State Order Extension |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2025-07-29.
Rock City vs. Nearby Illinois Cities
How Rock City's water quality compares to similar cities in Illinois:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Rock City | F | 2 | 1 | 313 |
| Lee | C | 4 | 1 | 313 |
| Arrowsmith | C | 0 | 1 | 315 |
| Armington | C | 0 | 1 | 310 |
Common Questions About Rock City Water
These are the most common questions residents search for about water quality in Rock City, Illinois:
Is Rock City water hard or soft? Water hardness varies by source. Rock City's 1 water system uses a single source. Check your ZIP code report for specific hardness data.
Can I drink Rock City tap water? Rock City's water receives a grade of F (31/100). No health-based violations have been recorded, but home testing is always recommended.
What is the best water filter for Rock City? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Rock City vs. Illinois Average
Understanding how Rock 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 Rock City.
ZIP Codes in Rock City
Rock City spans 1 ZIP code. The ZIP with the lowest water quality score is 61070. 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.