B67/100
Crystal Lake Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 40,661 residents · Illinois
What's In Crystal Lake's Tap Water?
66
Contaminants Tested
0
Exceed EPA Limits
1
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.009 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 1996.
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Water Utility Details
CRYSTAL LAKE
Population Served
40,661
Water Source
Groundwater
System ID
IL1110150
Frequently Asked Questions About Crystal Lake Water
Is Crystal Lake tap water safe to drink?
Crystal Lake, Illinois tap water receives a grade of B (67/100), which is considered good. Out of 66 contaminants tested, none exceed EPA maximum contaminant levels (MCLs) and 1 exceed health guidelines (MCLGs). While the water meets federal standards, some residents may still choose to use a filter for additional peace of mind.
What contaminants are in Crystal Lake's water?
Of the 66 contaminants tested in Crystal Lake's water supply, the most notable include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Crystal Lake have any water quality violations?
Yes, Crystal Lake has 14 EPA violation(s) on record, with the most recent in 1996. Violation types include MCL, MR. 4 of these are health-based violations, which are the most serious category.
Do I need a water filter in Crystal Lake?
Crystal Lake water meets EPA standards, so a filter is not strictly necessary. However, some residents prefer the added security of a water filter. EPA health goals (MCLGs) are stricter than legal limits and are set at levels with zero expected health risk. 1 contaminant(s) exceed these stricter goals.
Where does Crystal Lake's tap water come from?
Crystal Lake's drinking water is sourced from groundwater and supplied by CRYSTAL LAKE. The system serves approximately 40,661 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Crystal Lake's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Crystal Lake's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does Crystal Lake's water compare to other cities in Illinois?
Crystal Lake's water quality score of 67/100 earns a grade of B, which is considered good. This is an above-average score compared to many cities nationwide. Visit our Illinois state page to see how all cities in the state compare.
What should I do if I'm concerned about Crystal Lake's water quality?
If you have concerns about Crystal Lake's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (CRYSTAL LAKE) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.