Hard water in Coppell, TX

Tap water hardness
143mg/L
8.4gpg
Hard

Reported by City of Coppell · September 2025

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

Coppell water measures 143 mg/L (8.4 gpg) of hardness, hard by USGS standards. The number comes from City of Coppell, dated September 2025.

Coppell on the hardness scale, with nearby cities
060120180240300360+TX typical 112The Colony: 11 mg/LThe Colony 11Highland Village: 26 mg/LHighland Village 26Grapevine: 53 mg/LGrapevine 53Colleyville: 61 mg/LColleyville 61Irving: 81 mg/LIrving 81Lewisville: 90 mg/LLewisville 90Flower Mound: 91 mg/LFlower Mound 91Hickory Creek: 93 mg/LHickory Creek 93Carrollton: 136 mg/LCarrollton 136Farmers Branch: 168 mg/LFarmers Branch 168Coppell 143mg/L as calcium carbonate060120180240300360+TX 112Grapevine: 53 mg/LGrapevine 53Irving: 81 mg/LIrving 81Lewisville: 90 mg/LLewisville 90Flower Mound: 91 mg/LFlower Mou. 91Carrollton: 136 mg/LCarrollton 136Farmers Branch: 168 mg/LFarmers Br. 168143 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Coppell sits 31 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 11 mg/L in The Colony to 168 in Farmers Branch.

What 143 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 143 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 Coppell

3 people × 75 gallons a day × 8.4 gpg = 1,881 grains a day. A 24,000-grain unit regenerates about every 12 days.

Size it for your household

EPA record for Coppell's water system

City of Coppell · PWSID TX0570040

No health-based violations since 2016

Serves about 43,193 people from surface water.

Health-based
0
Monitoring or reporting
2
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 Coppell water hard?

Yes. It measures about 143 mg/L (8.4 grains per gallon), which the USGS classes as hard.

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

About 8.4 gpg. One grain per gallon equals 17.1 mg/L, so 143 mg/L divided by 17.1 gives 8.4.

What size water softener do I need in Coppell?

For 3 people using 75 gallons each per day, 8.4 gpg works out to about 1,881 grains a day. A 24,000-grain softener covers that with a regeneration about every 12 days.

Has the Coppell water system had EPA violations?

EPA records show no health-based violations for City of Coppell since 2016. There were also 2 monitoring or reporting violations, which are about late or missing tests and notices.

Nearby cities

All 342 cities in Texas

Hardness data: TapWaterData US Water Hardness (utility report, September 17, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.