How hard is the water in Sun City, AZ?

Tap water hardness
75mg/L
4.4gpg
Moderately hard

Reported by EPCOR - Sun City · July 2025

AZ typical
180 mg/L
EPA health violations since 2016
0
Softener for 3 people
24k grain
Data
Utility report

Sun City water measures 75 mg/L (4.4 gpg) of hardness, moderately hard by USGS standards. The number comes from EPCOR - Sun City, dated July 2025.

Sun City on the hardness scale, with nearby cities
060120180240300360+AZ typical 180Youngtown: 75 mg/LYoungtown 75Avondale: 105 mg/LAvondale 105Goodyear: 154 mg/LGoodyear 154Glendale: 168 mg/LGlendale 168Paradise Valley: 171 mg/LParadise Valley 171Scottsdale: 172 mg/LScottsdale 172Guadalupe: 172 mg/LGuadalupe 172Tempe: 180 mg/LTempe 180El Mirage: 208 mg/LEl Mirage 208Phoenix: 237 mg/LPhoenix 237Sun City 75mg/L as calcium carbonate060120180240300360+AZ 180Youngtown: 75 mg/LYoungtown 75Avondale: 105 mg/LAvondale 105Glendale: 168 mg/LGlendale 168Paradise Valley: 171 mg/LParadise V. 171El Mirage: 208 mg/LEl Mirage 208Phoenix: 237 mg/LPhoenix 23775 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

At 75 mg/L, Sun City is 105 mg/L below the typical Arizona figure of 180. None of the 10 nearest cities we track has softer water. The range nearby runs from 75 mg/L in Youngtown to 237 in Phoenix.

What 75 mg/L means at home

You may see faint white spots on glasses and shower doors after the water dries.

Scale builds up slowly. A kettle or coffee maker needs descaling now and then, maybe every few months.

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

Optional. Plenty of households at this level live with it and descale the kettle now and then.

Water softener

Worth a look if spots on glass bother you, or if your tankless water heater manual asks for softer water.

Carbon filter

Improves taste and removes chlorine. It leaves calcium and magnesium in place.

Softener size for Sun City

3 people × 75 gallons a day × 4.4 gpg = 988 grains a day. A 24,000-grain unit regenerates about every 24 days.

Size it for your household

EPA record for Sun City's water system

EPCOR - Sun City · PWSID AZ0407099

No health-based violations since 2016

Serves about 38,016 people from groundwater.

Health-based
0
Monitoring or reporting
1
Open now
0

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 Sun City water hard?

Somewhat. It measures about 75 mg/L (4.4 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in Sun City in grains per gallon?

About 4.4 gpg. One grain per gallon equals 17.1 mg/L, so 75 mg/L divided by 17.1 gives 4.4.

What size water softener do I need in Sun City?

For 3 people using 75 gallons each per day, 4.4 gpg works out to about 988 grains a day. A 24,000-grain softener covers that with a regeneration about every 24 days.

Has the Sun City water system had EPA violations?

EPA records show no health-based violations for EPCOR - Sun City since 2016. There were also 1 monitoring or reporting violation, which are about late or missing tests and notices.

Nearby cities

All 42 cities in Arizona

Hardness data: TapWaterData US Water Hardness (utility report, July 11, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.