Hard water in Fredericksburg, TX
Reported by City of Fredericksburg · May 2025
- TX typical
- 112 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 32k grain
- Data
- Utility report
The water in Fredericksburg carries roughly 304 mg/L of dissolved calcium and magnesium, or 17.8 grains per gallon. That is very hard water. The number comes from City of Fredericksburg, dated May 2025. Reports for this system disagree, with values from 184 to 358 mg/L.
Fredericksburg sits 192 mg/L above the typical Texas figure of 112. None of the 10 nearest cities we track has harder water. The range nearby runs from 139 mg/L in Burnet to 197 in Kerrville.
What 304 mg/L means at home
Scale forms fast here. Kettles and coffee makers need regular descaling, and showerheads clog unless you clean them.
Tank water heaters collect mineral sediment that insulates the water from the burner, so flushing the tank matters more than usual.
Dishes and glass shower doors spot easily. Soap scum and a dull film on hair or laundry are common complaints.
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
At 304 mg/L most of the trouble is scale, and only a few things deal with it.
Ion-exchange water softener
The standard whole-house fix. It swaps calcium and magnesium for sodium or potassium and needs salt plus a drain. Size it with the calculator below.
Salt-free conditioner
No salt and no drain line. It changes how minerals form scale instead of removing them, so water still tests hard.
Reverse osmosis or carbon filter
Under-sink reverse osmosis removes minerals from drinking water only. Plain carbon filters improve taste but do not soften.
3 people × 75 gallons a day × 17.8 gpg = 4,001 grains a day. A 32,000-grain unit regenerates about every 7 days.
EPA record for Fredericksburg's water system
No health-based violations since 2016
Serves about 12,360 people from groundwater.
- Health-based
- 0
- Monitoring or reporting
- 11
- Open now
- 1
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 Fredericksburg water hard?
Yes. It measures about 304 mg/L (17.8 grains per gallon), which the USGS classes as very hard.
What is the water hardness in Fredericksburg in grains per gallon?
About 17.8 gpg. One grain per gallon equals 17.1 mg/L, so 304 mg/L divided by 17.1 gives 17.8.
What size water softener do I need in Fredericksburg?
For 3 people using 75 gallons each per day, 17.8 gpg works out to about 4,001 grains a day. A 32,000-grain softener covers that with a regeneration about every 7 days.
Has the Fredericksburg water system had EPA violations?
EPA records show no health-based violations for City of Fredericksburg since 2016. There were also 11 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- Kerrville197 mg/LVery hard
- Horseshoe Bay159 mg/LHard
- Fair Oaks Ranch180 mg/LHard
- Scenic Oaks180 mg/LVery hard
- Marble Falls171 mg/LHard
- Bulverde157 mg/LHard
- Timberwood Park180 mg/LHard
- Dripping Springs148 mg/LHard
- Helotes180 mg/LHard
- Burnet139 mg/LHard
Hardness data: TapWaterData US Water Hardness (utility report, May 6, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.