How hard is the water in Allen, TX?

Tap water hardness
109mg/L
6.4gpg
Moderately hard

Reported by City of Allen · September 2025

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

Tap water in Allen has about 109 mg/L of hardness, which is 6.4 grains per gallon. On the USGS scale that counts as moderately hard. The number comes from City of Allen, dated September 2025.

Allen on the hardness scale, with nearby cities
060120180240300360+TX typical 112Fairview: 90 mg/LFairview 90Murphy: 108 mg/LMurphy 108Lucas: 110 mg/LLucas 110Princeton: 116 mg/LPrinceton 116Wylie: 126 mg/LWylie 126McKinney: 132 mg/LMcKinney 132Frisco: 149 mg/LFrisco 149Plano: 150 mg/LPlano 150Richardson: 150 mg/LRichardson 150Sachse: 164 mg/LSachse 164Allen 109mg/L as calcium carbonate060120180240300360+TX 112Fairview: 90 mg/LFairview 90Murphy: 108 mg/LMurphy 108Lucas: 110 mg/LLucas 110McKinney: 132 mg/LMcKinney 132Frisco: 149 mg/LFrisco 149Plano: 150 mg/LPlano 150109 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Allen sits close to the typical Texas figure of 112 mg/L. Of the 10 nearest cities we track, 2 have softer water and 8 have harder. The range nearby runs from 90 mg/L in Fairview to 164 in Sachse.

What 109 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 Allen

3 people × 75 gallons a day × 6.4 gpg = 1,433 grains a day. A 24,000-grain unit regenerates about every 16 days.

Size it for your household

EPA record for Allen's water system

City of Allen · PWSID TX0430025

No health-based violations since 2016

Serves about 113,746 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 Allen water hard?

Somewhat. It measures about 109 mg/L (6.4 grains per gallon), which the USGS classes as moderately hard.

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

About 6.4 gpg. One grain per gallon equals 17.1 mg/L, so 109 mg/L divided by 17.1 gives 6.4.

What size water softener do I need in Allen?

For 3 people using 75 gallons each per day, 6.4 gpg works out to about 1,433 grains a day. A 24,000-grain softener covers that with a regeneration about every 16 days.

Has the Allen water system had EPA violations?

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

Nearby cities

All 342 cities in Texas

Hardness data: TapWaterData US Water Hardness (utility report, September 22, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.