Hard water in Paradise Valley, AZ
Reported by Phoenix City of · October 2025
- AZ typical
- 180 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Utility report
The water in Paradise Valley carries roughly 171 mg/L of dissolved calcium and magnesium, or 10.0 grains per gallon. That is hard water. The number comes from Phoenix City of, dated October 2025.
Paradise Valley sits close to the typical Arizona figure of 180 mg/L. Of the 10 nearest cities we track, 5 have softer water and 5 have harder. The range nearby runs from 75 mg/L in Sun City to 237 in Phoenix.
What 171 mg/L means at home
Expect white crust on faucets and showerheads, plus spots on dishes that come out of the dishwasher.
Kettles collect scale quickly. Water heaters build up sediment at the bottom of the tank, which makes them work harder over time.
Soap and detergent need a little more to lather, and soap scum shows up in the tub.
Hardness is not a health problem, and EPA sets no limit for it. It is a matter of scale and soap.
What to do about it
At 171 mg/L most of the trouble is scale, and only a few things deal with it.
Ion-exchange water softener
The standard whole-house fix. It swaps calcium and magnesium for sodium or potassium and needs salt plus a drain. Size it with the calculator below.
Salt-free conditioner
No salt and no drain line. It changes how minerals form scale instead of removing them, so water still tests hard.
Reverse osmosis or carbon filter
Under-sink reverse osmosis removes minerals from drinking water only. Plain carbon filters improve taste but do not soften.
3 people × 75 gallons a day × 10.0 gpg = 2,248 grains a day. A 24,000-grain unit regenerates about every 10 days.
EPA record for Paradise Valley's water system
No health-based violations since 2016
Serves about 14,107 people from surface water.
- Health-based
- 0
- Monitoring or reporting
- 3
- Open now
- 0
EPA lists EPCOR - Paradise Valley/Scottsdale as the system serving Paradise Valley. The hardness figure above comes from a different system's report, which TapWaterData uses for Paradise Valley.
Health-based means a contaminant above its legal limit or a missed treatment step. Monitoring and reporting violations are late or missing tests and notices. Source: EPA ECHO, 2026Q3 export, violations with periods starting 2016 or later. Full EPA record.
Questions
Is Paradise Valley water hard?
Yes. It measures about 171 mg/L (10.0 grains per gallon), which the USGS classes as hard.
What is the water hardness in Paradise Valley in grains per gallon?
About 10.0 gpg. One grain per gallon equals 17.1 mg/L, so 171 mg/L divided by 17.1 gives 10.0.
What size water softener do I need in Paradise Valley?
For 3 people using 75 gallons each per day, 10.0 gpg works out to about 2,248 grains a day. A 24,000-grain softener covers that with a regeneration about every 10 days.
Has the Paradise Valley water system had EPA violations?
EPA records show no health-based violations for EPCOR - Paradise Valley/Scottsdale since 2016. There were also 3 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- Phoenix237 mg/LVery hard
- Scottsdale172 mg/LHard
- Tempe180 mg/LHard
- Guadalupe172 mg/LHard
- Glendale168 mg/LHard
- Sun City75 mg/LModerately hard
- Chandler139 mg/LHard
- Youngtown75 mg/LModerately hard
- Gilbert168 mg/LHard
- El Mirage208 mg/LVery hard
Hardness data: TapWaterData US Water Hardness (utility report, October 5, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.