Wonder Lake
EPA ID: IL1115750 · 3,870 people served · 2 ZIP codes
ZipCheckup's reading of EPA records for Wonder Lake (IL1115750): 1 health-based violation recorded since 2021. Looking at the EPA enforcement file for Wonder Lake, 5 violations are listed in the dataset, and none is recorded as open for the 3,870 people in its service area.
Data: EPA SDWIS
Service Area Map
Coverage area for Wonder Lake Source: EPA SDWIS service area boundaries.
Service area boundary
Demographics of ZIP Codes Served
The ZIP codes associated with Wonder Lake have a median household income of $91,807 and about 44,788 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 58% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Wonder Lake's water is classified in EPA records as a groundwater source. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
Wastewater Proximity Note: This service area ranks in the 80th percentile nationally for proximity to wastewater discharge points.
Superfund Proximity Note: This service area ranks in the 60th percentile nationally for proximity to Superfund (NPL) sites. Groundwater sources near contaminated sites may face elevated risk from industrial chemicals.
Infrastructure Risk
Comparable Water Systems
Similar-sized systems in Illinois
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
Wonder Lake (EPA ID: IL1115750) is a community water system in Illinois that serves approximately 3,870 people from groundwater sources.
This system provides water to 2 ZIP codes across 2 communities.
Violation History
Status breakdown for accepted records with record years 2021-2026: 5 resolved, 0 archived, 0 addressed, and 0 unaddressed. Under this source contract, current noncompliance is the sum of addressed and unaddressed records. Archived and resolved records are excluded from current noncompliance.
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| July 1, 2025 | Lead and Copper Rule | Non-health-based | Resolved |
| April 1, 2025 | Lead and Copper Rule | Non-health-based | Resolved |
| February 10, 2024 | Public Notice | Non-health-based | Resolved |
| April 2, 2023 | Lead and Copper Rule | Health-based | Resolved |
| January 1, 2022 | Nitrate | Non-health-based | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Public Notice | Treatment Technique, Monitoring & Reporting | 3 | Yes |
| Nitrate | Monitoring & Reporting | 1 | No |
| Public Notice | Other (notice or report rule) | 1 | No |
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.0018 mg/L | No | 2026-06-30 |
The accepted LCR snapshot contains 1 reported copper action-level exceedance record for this PWSID. The source does not provide a verified copper level for publication.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Ask your water utility whether running cold water for 2 minutes is enough to flush your plumbing before drinking.
ZIP Codes Served
Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by IL or modeled from parcel and building-footprint data.
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Wonder Lake (IL1115750) on EPA.gov.
Frequently Asked Questions
Is Wonder Lake water safe to drink?
The accepted 2026Q2 ECHO snapshot shows no current noncompliance for Wonder Lake; its 5 accepted 2021-2026 records are resolved or archived. Historical compliance status does not establish conditions at a specific tap.
How many people does Wonder Lake serve?
Wonder Lake serves approximately 3,870 people across 2 ZIP codes in Illinois.
Where does Wonder Lake get its water?
The primary water source is groundwater.
Federal UCMR5 PFAS Monitoring: No PFAS Reported Above Reporting Levels
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). No PFAS compounds were reported above UCMR5 minimum reporting levels.
EPA's April 2024 PFAS rule sets MCLs of 4 ppt for PFOA and PFOS and 10 ppt for PFHxS, PFNA and HFPO-DA (GenX); water systems must comply from 2029. Other PFAS compounds have no individual federal MCL. A state standard is shown only where this system's state has its own enforceable PFAS limit. Detection results are EPA UCMR5 samples, not a measurement at your tap.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Wonder Lake (IL): 1 Health Violation. https://zipcheckup.com/water-system/il1115750/
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author = {{ZipCheckup}},
title = {{Wonder Lake (IL): 1 Health Violation}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/il1115750/}
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What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
Wonder Lake (EPA ID: IL1115750) - request the latest Consumer Confidence Report or ask about specific contaminants.