Hard water in Alamo, TX
Reported by North Alamo WSC · June 2022
- TX typical
- 112 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Utility report
Alamo water measures 166 mg/L (9.7 gpg) of hardness, hard by USGS standards. The number comes from North Alamo WSC, dated June 2022. Reports for this system disagree, with values from 166 to 224 mg/L.
At 166 mg/L, Alamo is 54 mg/L above the typical Texas figure of 112. Of the 10 nearest cities we track, 7 have softer water and 3 have harder. The range nearby runs from 156 mg/L in Edinburg to 216 in Donna.
What 166 mg/L means at home
Expect white crust on faucets and showerheads, plus spots on dishes that come out of the dishwasher.
Kettles collect scale quickly. Water heaters build up sediment at the bottom of the tank, which makes them work harder over time.
Soap and detergent need a little more to lather, and soap scum shows up in the tub.
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 166 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 × 9.7 gpg = 2,178 grains a day. A 24,000-grain unit regenerates about every 11 days.
EPA record for Alamo's water system
No health-based violations since 2016
Serves about 21,065 people from surface water.
- Health-based
- 0
- Monitoring or reporting
- 7
- Open now
- 0
EPA lists City of Alamo as the system serving Alamo. The hardness figure above comes from a different system's report, which TapWaterData uses for Alamo.
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 Alamo water hard?
Yes. It measures about 166 mg/L (9.7 grains per gallon), which the USGS classes as hard.
What is the water hardness in Alamo in grains per gallon?
About 9.7 gpg. One grain per gallon equals 17.1 mg/L, so 166 mg/L divided by 17.1 gives 9.7.
What size water softener do I need in Alamo?
For 3 people using 75 gallons each per day, 9.7 gpg works out to about 2,178 grains a day. A 24,000-grain softener covers that with a regeneration about every 11 days.
Has the Alamo water system had EPA violations?
EPA records show no health-based violations for City of Alamo since 2016. There were also 7 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- San Juan162 mg/LHard
- Pharr210 mg/LVery hard
- Donna216 mg/LVery hard
- Murillo161 mg/LHard
- Weslaco164 mg/LHard
- Olivarez161 mg/LHard
- McAllen211 mg/LVery hard
- Hidalgo161 mg/LHard
- Edinburg156 mg/LHard
- Mila Doce161 mg/LHard
Hardness data: TapWaterData US Water Hardness (utility report, June 30, 2022), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.