Hard water in Herriman, UT
Reported by Herriman City Municipal Water Department · August 2024
- UT typical
- 231 mg/L
- EPA health violations since 2016
- 1
- Softener for 3 people
- 48k grain
- Data
- Utility report
Herriman water measures 424 mg/L (24.8 gpg) of hardness, very hard by USGS standards. The number comes from Herriman City Municipal Water Department, dated August 2024.
At 424 mg/L, Herriman is 193 mg/L above the typical Utah figure of 231. None of the 10 nearest cities we track has harder water. The range nearby runs from 94 mg/L in Draper to 365 in Kearns.
What 424 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 424 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 × 24.8 gpg = 5,580 grains a day. A 48,000-grain unit regenerates about every 8 days.
EPA record for Herriman's water system
1 health-based violation since 2016
Serves about 60,000 people from surface water.
- Health-based
- 1
- Monitoring or reporting
- 3
- Open now
- 0
EPA lists this system as serving Herriman.
| Contaminant or rule | Violations | Period | Status |
|---|---|---|---|
| Groundwater Ruletreatment of well water | 1 | 2017 | Resolved |
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 Herriman water hard?
Yes. It measures about 424 mg/L (24.8 grains per gallon), which the USGS classes as very hard.
What is the water hardness in Herriman in grains per gallon?
About 24.8 gpg. One grain per gallon equals 17.1 mg/L, so 424 mg/L divided by 17.1 gives 24.8.
What size water softener do I need in Herriman?
For 3 people using 75 gallons each per day, 24.8 gpg works out to about 5,580 grains a day. A 48,000-grain softener covers that with a regeneration about every 8 days.
Has the Herriman water system had EPA violations?
EPA records show 1 health-based violation for Herriman City Municipal Water Department since 2016, involving Groundwater Rule. There were also 3 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- Riverton206 mg/LVery hard
- South Jordan142 mg/LHard
- West Jordan243 mg/LVery hard
- Draper94 mg/LModerately hard
- Lehi144 mg/LHard
- Sandy156 mg/LHard
- Midvale161 mg/LHard
- Kearns365 mg/LVery hard
- Saratoga Springs96 mg/LModerately hard
- Taylorsville236 mg/LVery hard
Hardness data: TapWaterData US Water Hardness (utility report, August 26, 2024), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.