Hard water in Logan, UT
Reported by Logan City Water System · September 2025
- UT typical
- 231 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Utility report
Tap water in Logan has about 194 mg/L of hardness, which is 11.3 grains per gallon. On the USGS scale that counts as very hard. The number comes from Logan City Water System, dated September 2025.
Logan sits 37 mg/L below the typical Utah figure of 231. Of the 10 nearest cities we track, 4 have softer water and 5 have harder. The range nearby runs from 104 mg/L in Ogden to 378 in Brigham City.
What 194 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 194 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 × 11.3 gpg = 2,554 grains a day. A 24,000-grain unit regenerates about every 9 days.
EPA record for Logan's water system
No health-based violations since 2016
Serves about 55,540 people from groundwater.
- Health-based
- 0
- Monitoring or reporting
- 3
- Open now
- 0
EPA lists this system as serving Logan.
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 Logan water hard?
Yes. It measures about 194 mg/L (11.3 grains per gallon), which the USGS classes as very hard.
What is the water hardness in Logan in grains per gallon?
About 11.3 gpg. One grain per gallon equals 17.1 mg/L, so 194 mg/L divided by 17.1 gives 11.3.
What size water softener do I need in Logan?
For 3 people using 75 gallons each per day, 11.3 gpg works out to about 2,554 grains a day. A 24,000-grain softener covers that with a regeneration about every 9 days.
Has the Logan water system had EPA violations?
EPA records show no health-based violations for Logan City Water System since 2016. There were also 3 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- North Logan194 mg/LVery hard
- Brigham City378 mg/LVery hard
- Ogden104 mg/LModerately hard
- Roy199 mg/LVery hard
- Clearfield330 mg/LVery hard
- Layton190 mg/LVery hard
- Syracuse330 mg/LVery hard
- Fruit Heights189 mg/LVery hard
- Kaysville134 mg/LHard
- Farmington330 mg/LVery hard
Hardness data: TapWaterData US Water Hardness (utility report, September 1, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.