Hard water in Lehi, UT
Calculated from the utility's calcium and magnesium results · September 2024
- UT typical
- 231 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Calculated from utility data
Lehi water measures 144 mg/L (8.4 gpg) of hardness, hard by USGS standards. TapWaterData worked it out from the calcium and magnesium levels the local utility reports (September 2024). Reports for this system disagree, with values from 84 to 144 mg/L.
Lehi sits 87 mg/L below the typical Utah figure of 231. Of the 10 nearest cities we track, 3 have softer water and 7 have harder. The range nearby runs from 94 mg/L in Draper to 424 in Herriman.
What 144 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 144 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 × 8.4 gpg = 1,899 grains a day. A 24,000-grain unit regenerates about every 12 days.
EPA record for Lehi's water system
No health-based violations since 2016
Serves about 93,446 people from surface water.
- Health-based
- 0
- Monitoring or reporting
- 78
- Open now
- 0
EPA lists this system as serving Lehi.
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 Lehi water hard?
Yes. It measures about 144 mg/L (8.4 grains per gallon), which the USGS classes as hard.
What is the water hardness in Lehi in grains per gallon?
About 8.4 gpg. One grain per gallon equals 17.1 mg/L, so 144 mg/L divided by 17.1 gives 8.4.
What size water softener do I need in Lehi?
For 3 people using 75 gallons each per day, 8.4 gpg works out to about 1,899 grains a day. A 24,000-grain softener covers that with a regeneration about every 12 days.
Has the Lehi water system had EPA violations?
EPA records show no health-based violations for Lehi City since 2016. There were also 78 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- Highland195 mg/LVery hard
- American Fork223 mg/LVery hard
- Saratoga Springs96 mg/LModerately hard
- Draper94 mg/LModerately hard
- Pleasant Grove256 mg/LVery hard
- Riverton206 mg/LVery hard
- Herriman424 mg/LVery hard
- Lindon118 mg/LModerately hard
- Eagle Mountain256 mg/LVery hard
- Sandy156 mg/LHard
Hardness data: TapWaterData US Water Hardness (calculated from utility data, September 8, 2024), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.