Hard water in Grand Prairie, TX

Tap water hardness
138mg/L
8.1gpg
Hard

Reported by City of Grand Prairie · September 2023

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

Tap water in Grand Prairie has about 138 mg/L of hardness, which is 8.1 grains per gallon. On the USGS scale that counts as hard. The number comes from City of Grand Prairie, dated September 2023.

Grand Prairie on the hardness scale, with nearby cities
060120180240300360+TX typical 112Glenn Heights: 7 mg/LGlenn Heights 7Bedford: 8 mg/LBedford 8Cedar Hill: 16 mg/LCedar Hill 16Hurst: 35 mg/LHurst 35Mansfield: 53 mg/LMansfield 53Irving: 81 mg/LIrving 81Kennedale: 90 mg/LKennedale 90Arlington: 91 mg/LArlington 91DeSoto: 126 mg/LDeSoto 126Duncanville: 164 mg/LDuncanville 164Grand Prairie 138mg/L as calcium carbonate060120180240300360+TX 112Cedar Hill: 16 mg/LCedar Hill 16Mansfield: 53 mg/LMansfield 53Kennedale: 90 mg/LKennedale 90Arlington: 91 mg/LArlington 91DeSoto: 126 mg/LDeSoto 126Duncanville: 164 mg/LDuncanville 164138 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Grand Prairie sits 26 mg/L above the typical Texas figure of 112. Of the 10 nearest cities we track, 9 have softer water and 1 has harder. The range nearby runs from 7 mg/L in Glenn Heights to 164 in Duncanville.

What 138 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 138 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 Grand Prairie

3 people × 75 gallons a day × 8.1 gpg = 1,814 grains a day. A 24,000-grain unit regenerates about every 13 days.

Size it for your household

EPA record for Grand Prairie's water system

City of Grand Prairie · PWSID TX0570048

No health-based violations since 2016

Serves about 201,843 people from surface water.

Health-based
0
Monitoring or reporting
0
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 Grand Prairie water hard?

Yes. It measures about 138 mg/L (8.1 grains per gallon), which the USGS classes as hard.

What is the water hardness in Grand Prairie in grains per gallon?

About 8.1 gpg. One grain per gallon equals 17.1 mg/L, so 138 mg/L divided by 17.1 gives 8.1.

What size water softener do I need in Grand Prairie?

For 3 people using 75 gallons each per day, 8.1 gpg works out to about 1,814 grains a day. A 24,000-grain softener covers that with a regeneration about every 13 days.

Has the Grand Prairie water system had EPA violations?

EPA records show no health-based violations for City of Grand Prairie since 2016.

Nearby cities

All 342 cities in Texas

Hardness data: TapWaterData US Water Hardness (utility report, September 19, 2023), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.