How hard is the water in Prescott Valley, AZ?

Tap water hardness
109mg/L
6.4gpg
Moderately hardReports range 57–109

Reported by Town of Prescott Valley · September 2025

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

Prescott Valley water measures 109 mg/L (6.4 gpg) of hardness, moderately hard by USGS standards. The number comes from Town of Prescott Valley, dated September 2025. Reports for this system disagree, with values from 57 to 109 mg/L.

Prescott Valley on the hardness scale, with nearby cities
060120180240300360+AZ typical 180Sun City: 75 mg/LSun City 75Youngtown: 75 mg/LYoungtown 75Prescott: 104 mg/LPrescott 104Flagstaff: 161 mg/LFlagstaff 161Glendale: 168 mg/LGlendale 168Paradise Valley: 171 mg/LParadise Valley 171Scottsdale: 172 mg/LScottsdale 172Cottonwood: 179 mg/LCottonwood 179El Mirage: 208 mg/LEl Mirage 208Phoenix: 237 mg/LPhoenix 237Prescott Valley 109mg/L as calcium carbonate060120180240300360+AZ 180Sun City: 75 mg/LSun City 75Prescott: 104 mg/LPrescott 104Flagstaff: 161 mg/LFlagstaff 161Scottsdale: 172 mg/LScottsdale 172Cottonwood: 179 mg/LCottonwood 179El Mirage: 208 mg/LEl Mirage 208109 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 109 mg/L, Prescott Valley is 71 mg/L below the typical Arizona figure of 180. Of the 10 nearest cities we track, 3 have softer water and 7 have harder. The range nearby runs from 75 mg/L in Sun City to 237 in Phoenix.

What 109 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 Prescott Valley

3 people × 75 gallons a day × 6.4 gpg = 1,436 grains a day. A 24,000-grain unit regenerates about every 16 days.

Size it for your household

EPA record for Prescott Valley's water system

Town of Prescott Valley · PWSID AZ0413048

No health-based violations since 2016

Serves about 57,048 people from groundwater.

Health-based
0
Monitoring or reporting
7
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 Prescott Valley water hard?

Somewhat. It measures about 109 mg/L (6.4 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in Prescott Valley in grains per gallon?

About 6.4 gpg. One grain per gallon equals 17.1 mg/L, so 109 mg/L divided by 17.1 gives 6.4.

What size water softener do I need in Prescott Valley?

For 3 people using 75 gallons each per day, 6.4 gpg works out to about 1,436 grains a day. A 24,000-grain softener covers that with a regeneration about every 16 days.

Has the Prescott Valley water system had EPA violations?

EPA records show no health-based violations for Town of Prescott Valley since 2016. There were also 7 monitoring or reporting violations, which are about late or missing tests and notices.

Nearby cities

All 42 cities in Arizona

Hardness data: TapWaterData US Water Hardness (utility report, September 13, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.