McHenry County · 40,661 residents · 1 water system
16
Contaminants detected
6
PFAS compounds
460
Hardness (mg/L)
0
Above legal limits
3
Above health guidelines
Crystal Lake drinking water comes from groundwater wells. Based on the most recent monitoring data, 16 contaminants have been detected in the water supply, including Lead, Arsenic, Copper, Trichloroethylene, and 12 others. PFAS compounds have been detected at trace levels in Crystal Lake water. Water hardness is 460 mg/L (very hard), which can cause scale buildup in appliances and reduce soap effectiveness.
Contaminants detected in Crystal Lake water
16 total
Detection does not necessarily mean unsafe levels. See individual reports for concentrations and EPA limits.
Crystal Lake tap water meets EPA legal standards (Maximum Contaminant Levels). However, 3 contaminants are present above independent health guidelines, which are often stricter than legal limits. 16 contaminants have been detected in the water supply, including Lead, Arsenic, Copper, Trichloroethylene, Total Trihalomethanes. View the detailed report for each water system to see specific levels and how they compare to both legal limits and health guidelines.
What contaminants are in Crystal Lake water?
Monitoring has detected 16 contaminants in Crystal Lake's water supply: Lead, Arsenic, Copper, Trichloroethylene, Total Trihalomethanes, Haloacetic Acids (HAA5), cis-1,2-Dichloroethylene, PFHpA (Perfluoroheptanoic Acid), PFPeA (Perfluoropentanoic Acid), Barium, Fluoride, trans-1,2-Dichloroethylene, Orthophosphate, Phosphorus Total, Pfpea, PFBA (Perfluorobutanoic Acid). Additionally, 6 PFAS compounds have been detected at trace levels. 3 exceed health guidelines. See individual system reports for concentrations relative to EPA limits.
Does Crystal Lake water have PFAS?
Yes. 6 PFAS compounds have been detected in Crystal Lake's water supply at trace levels. PFAS are sometimes called "forever chemicals" because they do not break down in the environment. The EPA has set Maximum Contaminant Levels for several PFAS compounds. View the detailed report for specific concentrations.
Is Crystal Lake water hard?
Yes. Crystal Lake water has a hardness of 460 mg/L (very hard). Hard water is not a health concern but can cause scale buildup in water heaters and appliances, reduce soap effectiveness, and leave mineral deposits. Water softeners or conditioning systems can address hardness.
Where does Crystal Lake get its drinking water?
Crystal Lake's drinking water comes from groundwater wells that draw from underground aquifers. The water is treated and tested according to Illinois EPA and EPA requirements before distribution. Crystal Lake is served by one water system: CRYSTAL LAKE.
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