How hard is the water in Deer Park, TX?

Tap water hardness
85mg/L
5.0gpg
Moderately hardReports range 85–114

Reported by City of Deer Park · June 2022

TX typical
112 mg/L
EPA health violations since 2016
1
Softener for 3 people
24k grain
Data
Utility report

The water in Deer Park carries roughly 85 mg/L of dissolved calcium and magnesium, or 5.0 grains per gallon. That is moderately hard water. The number comes from City of Deer Park, dated June 2022. Reports for this system disagree, with values from 85 to 114 mg/L.

Deer Park on the hardness scale, with nearby cities
060120180240300360+TX typical 112Jacinto City: 33 mg/LJacinto City 33Channelview: 42 mg/LChannelview 42Webster: 42 mg/LWebster 42Cloverleaf: 48 mg/LCloverleaf 48La Porte: 51 mg/LLa Porte 51Galena Park: 57 mg/LGalena Park 57South Houston: 60 mg/LSouth Houston 60Seabrook: 61 mg/LSeabrook 61Nassau Bay: 67 mg/LNassau Bay 67Pasadena: 68 mg/LPasadena 68Deer Park 85mg/L as calcium carbonate060120180240300360+TX 112Channelview: 42 mg/LChannelview 42Cloverleaf: 48 mg/LCloverleaf 48La Porte: 51 mg/LLa Porte 51Galena Park: 57 mg/LGalena Park 57South Houston: 60 mg/LSouth Hous. 60Pasadena: 68 mg/LPasadena 6885 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 85 mg/L, Deer Park is 27 mg/L below the typical Texas figure of 112. None of the 10 nearest cities we track has harder water. The range nearby runs from 33 mg/L in Jacinto City to 68 in Pasadena.

What 85 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 Deer Park

3 people × 75 gallons a day × 5.0 gpg = 1,123 grains a day. A 24,000-grain unit regenerates about every 21 days.

Size it for your household

EPA record for Deer Park's water system

City of Deer Park · PWSID TX1010007

1 health-based violation since 2016

Serves about 34,495 people from surface water.

Health-based
1
Monitoring or reporting
12
Open now
0
20162017201820192020202120222023202420252026Total Coliform Rule'16'18'20'22'24'26Total Coliform Rule
Each dot is one health-based violation, placed at the start of its compliance period.
Contaminant or ruleViolationsPeriodStatus
Total Coliform Rulebacteria12017Resolved

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 Deer Park water hard?

Somewhat. It measures about 85 mg/L (5.0 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in Deer Park in grains per gallon?

About 5.0 gpg. One grain per gallon equals 17.1 mg/L, so 85 mg/L divided by 17.1 gives 5.0.

What size water softener do I need in Deer Park?

For 3 people using 75 gallons each per day, 5.0 gpg works out to about 1,123 grains a day. A 24,000-grain softener covers that with a regeneration about every 21 days.

Has the Deer Park water system had EPA violations?

EPA records show 1 health-based violation for City of Deer Park since 2016, involving Total Coliform Rule. There were also 12 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, June 21, 2022), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.