Hard water in Leavenworth, KS
Reported by Leavenworth Water Department · July 2025
- KS typical
- 138 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Utility report
Tap water in Leavenworth has about 128 mg/L of hardness, which is 7.5 grains per gallon. On the USGS scale that counts as hard. The number comes from Leavenworth Water Department, dated July 2025.
Leavenworth sits close to the typical Kansas figure of 138 mg/L. None of the 10 nearest cities we track has softer water. The range nearby runs from 135 mg/L in Shawnee to 416 in Bonner Springs.
What 128 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 128 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 × 7.5 gpg = 1,685 grains a day. A 24,000-grain unit regenerates about every 14 days.
EPA record for Leavenworth's water system
No health-based violations since 2016
Serves about 38,757 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 Leavenworth water hard?
Yes. It measures about 128 mg/L (7.5 grains per gallon), which the USGS classes as hard.
What is the water hardness in Leavenworth in grains per gallon?
About 7.5 gpg. One grain per gallon equals 17.1 mg/L, so 128 mg/L divided by 17.1 gives 7.5.
What size water softener do I need in Leavenworth?
For 3 people using 75 gallons each per day, 7.5 gpg works out to about 1,685 grains a day. A 24,000-grain softener covers that with a regeneration about every 14 days.
Has the Leavenworth water system had EPA violations?
EPA records show no health-based violations for Leavenworth Water Department since 2016. There were also 1 monitoring or reporting violation, which are about late or missing tests and notices.
Nearby cities
- Kansas City303 mg/LVery hard
- Tonganoxie215 mg/LVery hard
- Bonner Springs416 mg/LVery hard
- Atchison294 mg/LVery hard
- Shawnee135 mg/LHard
- Merriam135 mg/LHard
- Mission135 mg/LHard
- Roeland Park135 mg/LHard
- Lenexa135 mg/LHard
- De Soto135 mg/LHard
Hardness data: TapWaterData US Water Hardness (utility report, July 7, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.