How hard is the water in Rosenberg, TX?

Tap water hardness
108mg/L
6.3gpg
Moderately hard

Reported by City of Rosenberg · August 2025

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

Tap water in Rosenberg has about 108 mg/L of hardness, which is 6.3 grains per gallon. On the USGS scale that counts as moderately hard. The number comes from City of Rosenberg, dated August 2025.

Rosenberg on the hardness scale, with nearby cities
060120180240300360+TX typical 112Sealy: 44 mg/LSealy 44Bellaire: 54 mg/LBellaire 54Stafford: 57 mg/LStafford 57Richmond: 62 mg/LRichmond 62Missouri City: 67 mg/LMissouri City 67Pearland: 79 mg/LPearland 79West University Place: 88 mg/LWest University Place 88Wharton: 91 mg/LWharton 91Sugar Land: 118 mg/LSugar Land 118Sienna: 170 mg/LSienna 170Rosenberg 108mg/L as calcium carbonate060120180240300360+TX 112Stafford: 57 mg/LStafford 57Richmond: 62 mg/LRichmond 62Missouri City: 67 mg/LMissouri C. 67Wharton: 91 mg/LWharton 91Sugar Land: 118 mg/LSugar Land 118Sienna: 170 mg/LSienna 170108 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 108 mg/L, Rosenberg is close to the typical Texas figure of 112 mg/L. Of the 10 nearest cities we track, 8 have softer water and 2 have harder. The range nearby runs from 44 mg/L in Sealy to 170 in Sienna.

What 108 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 Rosenberg

3 people × 75 gallons a day × 6.3 gpg = 1,422 grains a day. A 24,000-grain unit regenerates about every 16 days.

Size it for your household

EPA record for Rosenberg's water system

City of Rosenberg · PWSID TX0790003

No health-based violations since 2016

Serves about 43,158 people from surface water.

Health-based
0
Monitoring or reporting
18
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 Rosenberg water hard?

Somewhat. It measures about 108 mg/L (6.3 grains per gallon), which the USGS classes as moderately hard.

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

About 6.3 gpg. One grain per gallon equals 17.1 mg/L, so 108 mg/L divided by 17.1 gives 6.3.

What size water softener do I need in Rosenberg?

For 3 people using 75 gallons each per day, 6.3 gpg works out to about 1,422 grains a day. A 24,000-grain softener covers that with a regeneration about every 16 days.

Has the Rosenberg water system had EPA violations?

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