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1. What is the hardness of Elmhurst water?

Hardness is about 144 mg/L as CaCO or about 8 gr/gal.

2. What is the source of water for the public water supply?

Elmhurst is now 100 percent Lake Michigan water. No well water is blended with the lake water; however, three standby wells are still in service and are kept operational as emergency backup sources of water. The DuPage Water Commission has recently completed a second water main to the Commission headquarters and has a looped system within the county that can provide water to Elmhurst in the event of water main breaks within the system.

3. Does the City use the old wells?

No, the City public water supply is 100% Lake Michigan water. The wells will be used in emergencies only.

4. Why is my water sometimes cloudy or 'milky' looking?

Water, especially cold water, can dissolve a significant amount of air. As water warms up that dissolved gas will be released in the form of tiny, almost microscopic bubbles. Those bubbles will make the water look cloudy. To test this, fill a clear glass container with water. Place the glass on the table and watch. Slowly the cloudiness will rise to the top as the bubbles float and disperse.