Crystal Lake
EPA ID: IL1110150 · 40,661 people served · 6 ZIP codes
ZipCheckup's reading of EPA SDWIS for Crystal Lake (IL1110150): 12 EPA violations in the last five years. Federal water data for Crystal Lake logs 12 historical violations - all addressed and cleared, leaving the utility in current compliance for 40,661 people.
Data: EPA SDWIS
Service Area Map
Coverage area for Crystal Lake Source: EPA SDWIS service area boundaries.
Service area boundary - Grade C
Service Area Demographics
The Crystal Lake serves a community with a median household income of $109,074 and an estimated 186,645 residents across its service area. Approximately 43% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Crystal Lake's water is pumped from underground aquifers. 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
Detected Contaminants
How Crystal Lake compares to EPA limits
What This Means For You
Contaminant 2015 at 1 mg/L exceeds the EPA maximum of 0.0005 mg/L. Probable carcinogen; liver & thyroid damage, immune suppression. Consider granular activated carbon (GAC) filtration.
Atrazine at 1 mg/L exceeds the EPA maximum of 0.003 mg/L. Endocrine disruption, cardiovascular & reproductive effects. Consider granular activated carbon (GAC) filtration.
Benzene at 1 mg/L exceeds the EPA maximum of 0.005 mg/L.
Contaminant 2005 at 1 mg/L exceeds the EPA maximum of mg/L.
Contaminant 2010 at 1 mg/L exceeds the EPA maximum of mg/L.
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 10 detections recorded. 2 exceed federal EPA limits (4 ppt for PFOA/PFOS). 1 exceeds state limits.
Contaminant 2015 was detected in this water system. granular activated carbon (GAC) filtration can reduce exposure.
Find a certified water filter →Comparable Water Systems
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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
Crystal Lake (EPA ID: IL1110150) is a community water system in Illinois that serves approximately 40,661 people from groundwater sources.
This system provides water to 6 ZIP codes across 5 communities.
ZIP-Area Home Safety Context: C (67/100)
This is the average Home Safety Score for 1 of 6 service-area ZIP codes with all required score domains observed. It is not a grade for the water utility.
Model 4.0.0 uses SDWIS identity plus accepted ECHO SDWA lifecycle-based water compliance, the UCMR 5 PFAS MCL screen, EPA radon zone, and annual EPA AirData AQI across three equally weighted domains. Missing required evidence suppresses the score.
Violation History
Status breakdown for accepted records with record years 2021-2026: 0 resolved, 12 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 |
|---|---|---|---|
| January 1, 2026 | Benzene | Non-health-based | Archived |
| January 1, 2026 | Contaminant 2037 | Non-health-based | Archived |
| January 1, 2026 | Contaminant 2051 | Non-health-based | Archived |
| January 1, 2026 | Contaminant 2274 | Non-health-based | Archived |
| January 1, 2026 | Atrazine | Non-health-based | Archived |
| January 1, 2026 | Contaminant 2010 | Non-health-based | Archived |
| January 1, 2026 | Contaminant 2035 | Non-health-based | Archived |
| January 1, 2026 | Contaminant 2005 | Non-health-based | Archived |
| January 1, 2026 | Contaminant 2065 | Non-health-based | Archived |
| January 1, 2026 | Contaminant 2042 | Non-health-based | Archived |
| January 1, 2026 | Contaminant 2067 | Non-health-based | Archived |
| January 1, 2026 | Contaminant 2015 | Non-health-based | Archived |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Contaminant 2005 | Other Violation | 1 | No |
| Contaminant 2010 | Other Violation | 1 | No |
| Contaminant 2015 | Other Violation | 1 | No |
| Contaminant 2035 | Other Violation | 1 | No |
| Contaminant 2037 | Other Violation | 1 | No |
| Atrazine | Organic | 1 | No |
| Contaminant 2042 | Other Violation | 1 | No |
| Benzene | Organic | 1 | No |
| Contaminant 2051 | Other Violation | 1 | No |
| Contaminant 2065 | Other Violation | 1 | No |
| Contaminant 2067 | Other Violation | 1 | No |
| Contaminant 2274 | Other Violation | 1 | No |
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.0077 mg/L | No | N/A |
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 2 (Moderate Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
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: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
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.
- 60012 - Crystal Lake
- 60014 - Crystal Lake
- 60050 - Mchenry
- 60098 - Woodstock
- 60102 - Algonquin
- 60156 - Lake In The Hills
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Crystal Lake (IL1110150) on EPA.gov.
Frequently Asked Questions
Is Crystal Lake water safe to drink?
The accepted 2026Q2 ECHO snapshot shows no current noncompliance for Crystal Lake; its 12 accepted 2021-2026 records are resolved or archived. Historical compliance status does not establish conditions at a specific tap.
How many people does Crystal Lake serve?
Crystal Lake serves approximately 40,661 people across 6 ZIP codes in Illinois.
Where does Crystal Lake get its water?
The primary water source is groundwater.
Federal UCMR5 PFAS Monitoring: Detected
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). PFAS compounds were detected below the current state-enforceable MCL.
Current MCL reflects the lowest state-enforceable limit (NYS 10 ppt for PFOA/PFOS, effective August 2020). The federal final MCL of 4 ppt for PFOA/PFOS (EPA April 2024 rule) is not enforceable until April 2029. Detections above 4 ppt but below 10 ppt are below current MCL but above the future federal limit.
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.). Crystal Lake (IL): 12 EPA Violations. https://zipcheckup.com/water-system/il1110150/
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author = {{ZipCheckup}},
title = {{Crystal Lake (IL): 12 EPA Violations}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/il1110150/}
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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
Crystal Lake (EPA ID: IL1110150) - request the latest Consumer Confidence Report or ask about specific contaminants.