Water Quality in Lake Zurich, IL: 4 Violations — Grade C
Grade C · Score 57/100 · 3 water systems · Updated 2026-05-03
Lake Zurich'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
EPA monitoring has flagged 4 reportable events for water systems in Lake Zurich, IL.
Water Quality by ZIP Code in Lake Zurich
Water quality varies across Lake Zurich's 1 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 60047 | C | 57 | 4 | 0 | View report → |
Water Quality Overview
Lake Zurich, Illinois receives a water quality grade of C with an overall score of 57 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 3 water systems serving Lake Zurich have accumulated 4 EPA violations (all monitoring/reporting type). These violations are tracked across 1 ZIP codes serving approximately 19,867 people.
What Grade C Means
A grade of C indicates moderate compliance issues. Lake Zurich'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 Lake Zurich water systems is 0.0102 mg/L — within EPA limits. No ZIP codes exceed the EPA lead action level.
With 47% of homes built before 1986, Lake Zurich 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
Lake Zurich is in EPA Radon Zone 2 (Moderate risk). Testing is recommended, especially for homes with basements or ground-level living spaces.
Water Systems Serving Lake Zurich
Lake Zurich is served by 3 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 19,867 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 7 enforcement actions against water systems serving Lake Zurich. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Lake Zurich
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 Lake Zurich Water Systems
The following contaminants have been detected or caused violations across Lake Zurich's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Gross Beta | Radionuclides | 50 pCi/L | 2 | 1 | No |
| Surface Water Treatment Rule | Treatment Technique | N/A | 1 | 1 | No |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 0.08 mg/L | 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 7 enforcement actions against water systems serving Lake Zurich. Recent actions:
| Date | Action Type |
|---|---|
| 2024-12-26 | State Order Extension |
| 2024-10-11 | State Informal Action |
| 2024-10-11 | State Informal Enforcement |
| 2024-10-10 | State Order Extension |
| 2024-06-07 | State Informal Action |
| 2024-01-11 | State Informal Action |
| 2024-01-11 | State Informal Enforcement |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2024-12-26.
Lake Zurich vs. Nearby Illinois Cities
How Lake Zurich's water quality compares to similar cities in Illinois:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Lake Zurich | C | 4 | 3 | 19,867 |
| Mokena | C | 4 | 1 | 19,887 |
| Evergreen Park | B | 0 | 1 | 19,943 |
| Lake Forest | C | 3 | 3 | 19,762 |
Common Questions About Lake Zurich Water
These are the most common questions residents search for about water quality in Lake Zurich, Illinois:
Is Lake Zurich water hard or soft? Water hardness varies by source. Lake Zurich's 3 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Lake Zurich tap water? Lake Zurich's water receives a grade of C (57/100). No health-based violations have been recorded, but home testing is always recommended.
What is the best water filter for Lake Zurich? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Lake Zurich vs. Illinois Average
Understanding how Lake Zurich 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 Lake Zurich.
ZIP Codes in Lake Zurich
Lake Zurich spans 1 ZIP code. The ZIP with the lowest water quality score is 60047. 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.