Hard water in Eloy, AZ

Tap water hardness
343mg/L
20.1gpg
Very hard

Reported by Picacho Water Company · August 2025

AZ typical
180 mg/L
EPA health violations since 2016
3
Softener for 3 people
32k grain
Data
Utility report

Eloy water measures 343 mg/L (20.1 gpg) of hardness, very hard by USGS standards. The number comes from Picacho Water Company, dated August 2025.

Eloy on the hardness scale, with nearby cities
060120180240300360+AZ typical 180Sun Lakes: 103 mg/LSun Lakes 103Florence: 109 mg/LFlorence 109San Tan Valley: 109 mg/LSan Tan Valley 109Chandler: 139 mg/LChandler 139Gilbert: 168 mg/LGilbert 168Queen Creek: 178 mg/LQueen Creek 178Tucson Mountains: 180 mg/LTucson Mountains 180Casas Adobes: 180 mg/LCasas Adobes 180Casa Grande: 220 mg/LCasa Grande 220Maricopa: 220 mg/LMaricopa 220Eloy 343mg/L as calcium carbonate060120180240300360+AZ 180Sun Lakes: 103 mg/LSun Lakes 103Florence: 109 mg/LFlorence 109San Tan Valley: 109 mg/LSan Tan Va. 109Queen Creek: 178 mg/LQueen Creek 178Casa Grande: 220 mg/LCasa Grande 220Maricopa: 220 mg/LMaricopa 220343 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Eloy sits 163 mg/L above the typical Arizona figure of 180. None of the 10 nearest cities we track has harder water. The range nearby runs from 103 mg/L in Sun Lakes to 220 in Casa Grande.

What 343 mg/L means at home

Scale forms fast here. Kettles and coffee makers need regular descaling, and showerheads clog unless you clean them.

Tank water heaters collect mineral sediment that insulates the water from the burner, so flushing the tank matters more than usual.

Dishes and glass shower doors spot easily. Soap scum and a dull film on hair or laundry are common complaints.

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 343 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.

Softener size for Eloy

3 people × 75 gallons a day × 20.1 gpg = 4,513 grains a day. A 32,000-grain unit regenerates about every 7 days.

Size it for your household

EPA record for Eloy's water system

Eloy City of · PWSID AZ0411030

3 health-based violations since 2016

Serves about 8,999 people from groundwater.

Health-based
3
Monitoring or reporting
33
Open now
1

EPA lists Eloy City of as the system serving Eloy. The hardness figure above comes from a different system's report, which TapWaterData uses for Eloy.

20162017201820192020202120222023202420252026Groundwater RuleNitrate'16'18'20'22'24'26Groundwater RuleNitrate
Each dot is one health-based violation, placed at the start of its compliance period.
Contaminant or ruleViolationsPeriodStatus
Groundwater Ruletreatment of well water120261 open
Nitrateoften from fertilizer or septic systems22026Resolved

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 Eloy water hard?

Yes. It measures about 343 mg/L (20.1 grains per gallon), which the USGS classes as very hard.

What is the water hardness in Eloy in grains per gallon?

About 20.1 gpg. One grain per gallon equals 17.1 mg/L, so 343 mg/L divided by 17.1 gives 20.1.

What size water softener do I need in Eloy?

For 3 people using 75 gallons each per day, 20.1 gpg works out to about 4,513 grains a day. A 32,000-grain softener covers that with a regeneration about every 7 days.

Has the Eloy water system had EPA violations?

EPA records show 3 health-based violations for Eloy City of since 2016, involving Groundwater Rule, Nitrate. There were also 33 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, August 18, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.