Hard water in Keller, TX

Tap water hardness
124mg/L
7.2gpg
Hard

Reported by City of Keller · July 2025

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

Tap water in Keller has about 124 mg/L of hardness, which is 7.2 grains per gallon. On the USGS scale that counts as hard. The number comes from City of Keller, dated July 2025.

Keller on the hardness scale, with nearby cities
060120180240300360+TX typical 112Justin: 6 mg/LJustin 6Lantana: 6 mg/LLantana 6Bedford: 8 mg/LBedford 8Hurst: 35 mg/LHurst 35Trophy Club: 51 mg/LTrophy Club 51Grapevine: 53 mg/LGrapevine 53Colleyville: 61 mg/LColleyville 61Flower Mound: 91 mg/LFlower Mound 91North Richland Hills: 109 mg/LNorth Richland Hills 109Haltom City: 109 mg/LHaltom City 109Keller 124mg/L as calcium carbonate060120180240300360+TX 112Bedford: 8 mg/LBedford 8Hurst: 35 mg/LHurst 35Trophy Club: 51 mg/LTrophy Club 51Colleyville: 61 mg/LColleyville 61North Richland Hills: 109 mg/LNorth Rich. 109Haltom City: 109 mg/LHaltom City 109124 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 124 mg/L, Keller is 12 mg/L above the typical Texas figure of 112. None of the 10 nearest cities we track has harder water. The range nearby runs from 6 mg/L in Justin to 109 in North Richland Hills.

What 124 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 124 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 Keller

3 people × 75 gallons a day × 7.2 gpg = 1,631 grains a day. A 24,000-grain unit regenerates about every 14 days.

Size it for your household

EPA record for Keller's water system

City of Keller · PWSID TX2200096

No health-based violations since 2016

Serves about 46,308 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 Keller water hard?

Yes. It measures about 124 mg/L (7.2 grains per gallon), which the USGS classes as hard.

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

About 7.2 gpg. One grain per gallon equals 17.1 mg/L, so 124 mg/L divided by 17.1 gives 7.2.

What size water softener do I need in Keller?

For 3 people using 75 gallons each per day, 7.2 gpg works out to about 1,631 grains a day. A 24,000-grain softener covers that with a regeneration about every 14 days.

Has the Keller water system had EPA violations?

EPA records show no health-based violations for City of Keller 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, July 15, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.