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What is hard water?
Hard water is the most common problem found in the average home. Hard water is typically defined as water having more than 1 GPG (grains per gallon) of dissolved minerals in it, generally consisting of calcium, magnesium carbonate and/or manganese. The amount of hardness in water is usually measured in either PPM (parts per million) or GPG (grains per gallon).
17.1 PPM or 17.1 Mg/L = 1 GPG
PPM or Mg/L divided by 17.1 = GPG
The range of CoP's water will be 1 – 12.6 gpg

Public Works - Water & Wastewater

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1. How do I shut off my water?
2. How do I know if I have a leak?
3. I have a leak on my property. Can someone from the city fix it?
4. What is hard water?
5. How is hydrogen sulfide gas produced in a water heater?
6. Does the City of Portland add fluoride to its drinking water?
7. What is our water source?
8. How can I check for a leaky toilet?
9. What should I do if my sewer is blocked?
10. Where does city maintenance end?