Hard water in Raymore, MO
County estimate from 65 water samples in Cass County · July 2026
- MO typical
- 121 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- County estimate
Water samples from around Raymore put hardness at about 219 mg/L (12.8 gpg), which would be very hard on the USGS scale. Treat this as a rough guide: it is the median of 65 samples taken across Cass County, mostly wells and streams, not a test of Raymore's treated tap water. One more reason for caution: EPA lists Raymore's water system as using surface water, which is often softer than the wells behind the county figure.
At 219 mg/L, Raymore is 98 mg/L above the typical Missouri figure of 121. Of the 10 nearest cities we track, 8 have softer water and 2 have harder. The range nearby runs from 97 mg/L in Lee's Summit to 310 in Grandview.
What 219 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 219 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 × 12.8 gpg = 2,882 grains a day. A 24,000-grain unit regenerates about every 8 days.
EPA record for Raymore's water system
No health-based violations since 2016
Serves about 21,517 people from surface water.
- Health-based
- 0
- Monitoring or reporting
- 1
- Open now
- 0
EPA lists this system as serving Raymore.
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 Raymore water hard?
Yes. It measures about 219 mg/L (12.8 grains per gallon), which the USGS classes as very hard.
What is the water hardness in Raymore in grains per gallon?
About 12.8 gpg. One grain per gallon equals 17.1 mg/L, so 219 mg/L divided by 17.1 gives 12.8.
What size water softener do I need in Raymore?
For 3 people using 75 gallons each per day, 12.8 gpg works out to about 2,882 grains a day. A 24,000-grain softener covers that with a regeneration about every 8 days.
Has the Raymore water system had EPA violations?
EPA records show no health-based violations for Raymore PWS since 2016. There were also 1 monitoring or reporting violation, which are about late or missing tests and notices.
Nearby cities
- Belton116 mg/LModerately hard
- Peculiar199 mg/LVery hard
- Grandview310 mg/LVery hard
- Lee's Summit97 mg/LModerately hard
- Harrisonville121 mg/LHard
- Raytown116 mg/LModerately hard
- Blue Springs310 mg/LVery hard
- Independence118 mg/LModerately hard
- Oak Grove176 mg/LHard
- Kansas City116 mg/LModerately hard
Hardness data: TapWaterData US Water Hardness (county estimate, July 4, 2026), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.