How hard is the water in Rockdale, TX?

Tap water hardness
77mg/L
4.5gpg
Moderately hardReports range 77–95

Reported by Southwest Milam WSC · June 2022

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

Rockdale water measures 77 mg/L (4.5 gpg) of hardness, moderately hard by USGS standards. The number comes from Southwest Milam WSC, dated June 2022. Reports for this system disagree, with values from 77 to 95 mg/L.

Rockdale on the hardness scale, with nearby cities
060120180240300360+TX typical 112Bryan: 11 mg/LBryan 11Giddings: 20 mg/LGiddings 20Camp Swift: 55 mg/LCamp Swift 55Elgin: 63 mg/LElgin 63Hutto: 141 mg/LHutto 141Cameron: 146 mg/LCameron 146Sonterra: 147 mg/LSonterra 147Jarrell: 150 mg/LJarrell 150Taylor: 160 mg/LTaylor 160Pflugerville: 178 mg/LPflugerville 178Rockdale 77mg/L as calcium carbonate060120180240300360+TX 112Giddings: 20 mg/LGiddings 20Elgin: 63 mg/LElgin 63Hutto: 141 mg/LHutto 141Cameron: 146 mg/LCameron 146Sonterra: 147 mg/LSonterra 147Taylor: 160 mg/LTaylor 16077 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Rockdale sits 35 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 11 mg/L in Bryan to 178 in Pflugerville.

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 Rockdale

3 people × 75 gallons a day × 4.5 gpg = 1,010 grains a day. A 24,000-grain unit regenerates about every 23 days.

Size it for your household

EPA record for Rockdale's water system

Southwest Milam WSC · PWSID TX1660015

No health-based violations since 2016

Serves about 11,739 people from groundwater.

Health-based
0
Monitoring or reporting
2
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 Rockdale 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 Rockdale 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 Rockdale?

For 3 people using 75 gallons each per day, 4.5 gpg works out to about 1,010 grains a day. A 24,000-grain softener covers that with a regeneration about every 23 days.

Has the Rockdale water system had EPA violations?

EPA records show no health-based violations for Southwest Milam WSC since 2016. There were also 2 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 23, 2022), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.