Hard water in Frisco, TX

Tap water hardness
149mg/L
8.7gpg
Hard

Reported by City of Frisco · October 2025

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

Frisco water measures 149 mg/L (8.7 gpg) of hardness, hard by USGS standards. The number comes from City of Frisco, dated October 2025.

Frisco on the hardness scale, with nearby cities
060120180240300360+TX typical 112The Colony: 11 mg/LThe Colony 11Savannah: 30 mg/LSavannah 30Paloma Creek South: 30 mg/LPaloma Creek South 30Providence Village: 30 mg/LProvidence Village 30Little Elm: 77 mg/LLittle Elm 77Oak Point: 77 mg/LOak Point 77Lewisville: 90 mg/LLewisville 90Allen: 109 mg/LAllen 109McKinney: 132 mg/LMcKinney 132Plano: 150 mg/LPlano 150Frisco 149mg/L as calcium carbonate060120180240300360+TX 112The Colony: 11 mg/LThe Colony 11Savannah: 30 mg/LSavannah 30Paloma Creek South: 30 mg/LPaloma Cre. 30Little Elm: 77 mg/LLittle Elm 77Allen: 109 mg/LAllen 109Plano: 150 mg/LPlano 150149 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 149 mg/L, Frisco is 37 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 150 in Plano.

What 149 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 149 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 Frisco

3 people × 75 gallons a day × 8.7 gpg = 1,960 grains a day. A 24,000-grain unit regenerates about every 12 days.

Size it for your household

EPA record for Frisco's water system

City of Frisco · PWSID TX0430005

No health-based violations since 2016

Serves about 231,910 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 Frisco water hard?

Yes. It measures about 149 mg/L (8.7 grains per gallon), which the USGS classes as hard.

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

About 8.7 gpg. One grain per gallon equals 17.1 mg/L, so 149 mg/L divided by 17.1 gives 8.7.

What size water softener do I need in Frisco?

For 3 people using 75 gallons each per day, 8.7 gpg works out to about 1,960 grains a day. A 24,000-grain softener covers that with a regeneration about every 12 days.

Has the Frisco water system had EPA violations?

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

Nearby cities

All 342 cities in Texas

Hardness data: TapWaterData US Water Hardness (utility report, October 2, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.