How hard is the water in Friendswood, TX?

Tap water hardness
69mg/L
4.0gpg
Moderately hard

Reported by City of Friendswood · January 2025

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

Tap water in Friendswood has about 69 mg/L of hardness, which is 4.0 grains per gallon. On the USGS scale that counts as moderately hard. The number comes from City of Friendswood, dated January 2025.

Friendswood on the hardness scale, with nearby cities
060120180240300360+TX typical 112Webster: 42 mg/LWebster 42South Houston: 60 mg/LSouth Houston 60Nassau Bay: 67 mg/LNassau Bay 67Pasadena: 68 mg/LPasadena 68Pearland: 79 mg/LPearland 79Deer Park: 85 mg/LDeer Park 85Bacliff: 94 mg/LBacliff 94Santa Fe: 100 mg/LSanta Fe 100League City: 114 mg/LLeague City 114Dickinson: 171 mg/LDickinson 171Friendswood 69mg/L as calcium carbonate060120180240300360+TX 112Webster: 42 mg/LWebster 42Nassau Bay: 67 mg/LNassau Bay 67Pearland: 79 mg/LPearland 79Santa Fe: 100 mg/LSanta Fe 100League City: 114 mg/LLeague City 114Dickinson: 171 mg/LDickinson 17169 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Friendswood sits 43 mg/L below the typical Texas figure of 112. Of the 10 nearest cities we track, 4 have softer water and 6 have harder. The range nearby runs from 42 mg/L in Webster to 171 in Dickinson.

What 69 mg/L means at home

You may see faint white spots on glasses and shower doors after the water dries.

Scale builds up slowly. A kettle or coffee maker needs descaling now and then, maybe every few months.

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

Optional. Plenty of households at this level live with it and descale the kettle now and then.

Water softener

Worth a look if spots on glass bother you, or if your tankless water heater manual asks for softer water.

Carbon filter

Improves taste and removes chlorine. It leaves calcium and magnesium in place.

Softener size for Friendswood

3 people × 75 gallons a day × 4.0 gpg = 911 grains a day. A 24,000-grain unit regenerates about every 26 days.

Size it for your household

EPA record for Friendswood's water system

City of Friendswood · PWSID TX0840002

No health-based violations since 2016

Serves about 43,190 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 Friendswood water hard?

Somewhat. It measures about 69 mg/L (4.0 grains per gallon), which the USGS classes as moderately hard.

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

About 4.0 gpg. One grain per gallon equals 17.1 mg/L, so 69 mg/L divided by 17.1 gives 4.0.

What size water softener do I need in Friendswood?

For 3 people using 75 gallons each per day, 4.0 gpg works out to about 911 grains a day. A 24,000-grain softener covers that with a regeneration about every 26 days.

Has the Friendswood water system had EPA violations?

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

Nearby cities

All 342 cities in Texas

Hardness data: TapWaterData US Water Hardness (utility report, January 3, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.