Hard water in Harrisonville, MO
Calculated from the utility's calcium and magnesium results · December 2020
- MO typical
- 121 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Calculated from utility data
Harrisonville water measures 121 mg/L (7.1 gpg) of hardness, hard by USGS standards. TapWaterData worked it out from the calcium and magnesium levels the local utility reports (December 2020).
Harrisonville sits close to the typical Missouri figure of 121 mg/L. Of the 10 nearest cities we track, 5 have softer water and 5 have harder. The range nearby runs from 97 mg/L in Lee's Summit to 310 in Grandview.
What 121 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 121 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 × 7.1 gpg = 1,588 grains a day. A 24,000-grain unit regenerates about every 15 days.
EPA record for Harrisonville's water system
No health-based violations since 2016
Serves about 10,250 people from surface water.
- Health-based
- 0
- Monitoring or reporting
- 5
- Open now
- 0
EPA lists this system as serving Harrisonville.
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 Harrisonville water hard?
Yes. It measures about 121 mg/L (7.1 grains per gallon), which the USGS classes as hard.
What is the water hardness in Harrisonville in grains per gallon?
About 7.1 gpg. One grain per gallon equals 17.1 mg/L, so 121 mg/L divided by 17.1 gives 7.1.
What size water softener do I need in Harrisonville?
For 3 people using 75 gallons each per day, 7.1 gpg works out to about 1,588 grains a day. A 24,000-grain softener covers that with a regeneration about every 15 days.
Has the Harrisonville water system had EPA violations?
EPA records show no health-based violations for Harrisonville PWS since 2016. There were also 5 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- Peculiar199 mg/LVery hard
- Raymore219 mg/LVery hard
- Belton116 mg/LModerately hard
- Grandview310 mg/LVery hard
- Lee's Summit97 mg/LModerately hard
- Raytown116 mg/LModerately hard
- Blue Springs310 mg/LVery hard
- Oak Grove176 mg/LHard
- Independence118 mg/LModerately hard
- Kansas City116 mg/LModerately hard
Hardness data: TapWaterData US Water Hardness (calculated from utility data, December 14, 2020), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.