How hard is the water in Oak Point, TX?

Tap water hardness
77mg/L
4.5gpg
Moderately hardReports range 5–77

Reported by Mustang SUD · August 2025

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

Oak Point water measures 77 mg/L (4.5 gpg) of hardness, moderately hard by USGS standards. The number comes from Mustang SUD, dated August 2025. Reports for this system disagree, with values from 5 to 77 mg/L.

Oak Point on the hardness scale, with nearby cities
060120180240300360+TX typical 112Lantana: 6 mg/LLantana 6The Colony: 11 mg/LThe Colony 11Highland Village: 26 mg/LHighland Village 26Paloma Creek South: 30 mg/LPaloma Creek South 30Providence Village: 30 mg/LProvidence Village 30Savannah: 30 mg/LSavannah 30Little Elm: 77 mg/LLittle Elm 77Lewisville: 90 mg/LLewisville 90Hickory Creek: 93 mg/LHickory Creek 93Lake Dallas: 95 mg/LLake Dallas 95Oak Point 77mg/L as calcium carbonate060120180240300360+TX 112Paloma Creek South: 30 mg/LPaloma Cre. 30Providence Village: 30 mg/LProvidence. 30Savannah: 30 mg/LSavannah 30Little Elm: 77 mg/LLittle Elm 77Hickory Creek: 93 mg/LHickory Cr. 93Lake Dallas: 95 mg/LLake Dallas 9577 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 77 mg/L, Oak Point is 35 mg/L below the typical Texas figure of 112. Of the 10 nearest cities we track, 6 have softer water and 3 have harder. The range nearby runs from 6 mg/L in Lantana to 95 in Lake Dallas.

What 77 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 Oak Point

3 people × 75 gallons a day × 4.5 gpg = 1,017 grains a day. A 24,000-grain unit regenerates about every 23 days.

Size it for your household

EPA record for Oak Point's water system

Mustang SUD · PWSID TX0610036

No health-based violations since 2016

Serves about 127,911 people from surface water.

Health-based
0
Monitoring or reporting
6
Open now
1

TapWaterData ties Oak Point to this system. EPA's service-area records do not name Oak Point, so check the utility printed on your water bill.

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 Oak Point water hard?

Somewhat. It measures about 77 mg/L (4.5 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in Oak Point in grains per gallon?

About 4.5 gpg. One grain per gallon equals 17.1 mg/L, so 77 mg/L divided by 17.1 gives 4.5.

What size water softener do I need in Oak Point?

For 3 people using 75 gallons each per day, 4.5 gpg works out to about 1,017 grains a day. A 24,000-grain softener covers that with a regeneration about every 23 days.

Has the Oak Point water system had EPA violations?

EPA records show no health-based violations for Mustang SUD since 2016. There were also 6 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, August 18, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.