Hard water in Harlingen, TX
Reported by Harlingen Water Works System · April 2025
- TX typical
- 112 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Utility report
Harlingen water measures 228 mg/L (13.4 gpg) of hardness, very hard by USGS standards. The number comes from Harlingen Water Works System, dated April 2025. Reports for this system disagree, with values from 228 to 280 mg/L.
At 228 mg/L, Harlingen is 116 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 149 mg/L in La Feria to 224 in San Benito.
What 228 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 228 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 × 13.4 gpg = 3,006 grains a day. A 24,000-grain unit regenerates about every 7 days.
EPA record for Harlingen's water system
No health-based violations since 2016
Serves about 85,900 people from surface water.
- Health-based
- 0
- Monitoring or reporting
- 1
- 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 Harlingen water hard?
Yes. It measures about 228 mg/L (13.4 grains per gallon), which the USGS classes as very hard.
What is the water hardness in Harlingen in grains per gallon?
About 13.4 gpg. One grain per gallon equals 17.1 mg/L, so 228 mg/L divided by 17.1 gives 13.4.
What size water softener do I need in Harlingen?
For 3 people using 75 gallons each per day, 13.4 gpg works out to about 3,006 grains a day. A 24,000-grain softener covers that with a regeneration about every 7 days.
Has the Harlingen water system had EPA violations?
EPA records show no health-based violations for Harlingen Water Works System since 2016. There were also 1 monitoring or reporting violation, which are about late or missing tests and notices.
Nearby cities
- San Benito224 mg/LVery hard
- La Feria149 mg/LHard
- Mercedes166 mg/LHard
- Los Fresnos181 mg/LVery hard
- Mila Doce161 mg/LHard
- Progreso173 mg/LHard
- Weslaco164 mg/LHard
- Olivarez161 mg/LHard
- Brownsville211 mg/LVery hard
- Elsa161 mg/LHard
Hardness data: TapWaterData US Water Hardness (utility report, April 15, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.