What is the hardness of Oak Brook water?
8.5 grains or 144 parts per million.

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1. Why doesn’t my water bill get forwarded to my winter address with my other mail?
2. Can I pay my water bill over the phone?
3. Where can I pay my water bill?
4. What is the water billing rate?
5. What is the hardness of Oak Brook water?
6. What hours are you open?