C54/100
Grayslake Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 23,806 residents · Illinois
What's In Grayslake's Tap Water?
69
Contaminants Tested
0
Exceed EPA Limits
1
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.010 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2006.
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
SADDLEBROOK FARMS
Population Served
2,558
Water Source
Groundwater
System ID
IL0970120
GRAYSLAKE
Population Served
21,248
Water Source
Purchased Surface Water
System ID
IL0970250
Frequently Asked Questions About Grayslake Water
Is Grayslake tap water safe to drink?
Grayslake, Illinois tap water receives a grade of C (54/100), which is considered fair. 1 contaminant(s) exceed EPA maximum contaminant levels and 33 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in Grayslake's water?
Of the 70 contaminants tested in Grayslake's water supply, the most notable include Copper (90th percentile), Lead (90th percentile). 1 contaminant(s) exceed EPA legal limits (MCLs). 2 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Grayslake have any water quality violations?
Yes, Grayslake has 33 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, MR, MCL. 11 of these are health-based violations, which are the most serious category.
Do I need a water filter in Grayslake?
Based on EPA data, using a water filter in Grayslake is recommended. 1 contaminant(s) exceed legal limits. An NSF-certified filter — such as a reverse osmosis or activated carbon system — can effectively reduce many common contaminants. Choose a filter certified to remove the specific contaminants found in your area.
Where does Grayslake's tap water come from?
Grayslake's drinking water is sourced from groundwater and supplied by SADDLEBROOK FARMS and 1 other water system(s). The system serves approximately 23,806 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Grayslake'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. Grayslake'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 Grayslake's water compare to other cities in Illinois?
Grayslake's water quality score of 54/100 earns a grade of C, which is considered fair. This is a below-average score that indicates room for improvement. Visit our Illinois state page to see how all cities in the state compare.
What should I do if I'm concerned about Grayslake's water quality?
If you have concerns about Grayslake'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 (SADDLEBROOK FARMS) 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.