Hard water in Columbia, MO
Reported by City of Columbia Utilities · December 2024
- MO typical
- 121 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Utility report
Tap water in Columbia has about 190 mg/L of hardness, which is 11.1 grains per gallon. On the USGS scale that counts as very hard. The number comes from City of Columbia Utilities, dated December 2024.
At 190 mg/L, Columbia is 69 mg/L above the typical Missouri figure of 121. Of the 10 nearest cities we track, 3 have softer water and 7 have harder. The range nearby runs from 73 mg/L in Macon to 307 in Warrenton.
What 190 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 190 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 × 11.1 gpg = 2,504 grains a day. A 24,000-grain unit regenerates about every 9 days.
EPA record for Columbia's water system
No health-based violations since 2016
Serves about 126,254 people from groundwater.
- Health-based
- 0
- Monitoring or reporting
- 2
- Open now
- 1
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 Columbia water hard?
Yes. It measures about 190 mg/L (11.1 grains per gallon), which the USGS classes as very hard.
What is the water hardness in Columbia in grains per gallon?
About 11.1 gpg. One grain per gallon equals 17.1 mg/L, so 190 mg/L divided by 17.1 gives 11.1.
What size water softener do I need in Columbia?
For 3 people using 75 gallons each per day, 11.1 gpg works out to about 2,504 grains a day. A 24,000-grain softener covers that with a regeneration about every 9 days.
Has the Columbia water system had EPA violations?
EPA records show no health-based violations for City of Columbia Utilities since 2016. There were also 2 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- Fulton289 mg/LVery hard
- Jefferson City218 mg/LVery hard
- Moberly135 mg/LHard
- Marshall143 mg/LHard
- Sedalia241 mg/LVery hard
- Macon73 mg/LModerately hard
- Warrenton307 mg/LVery hard
- Wright City306 mg/LVery hard
- Hannibal209 mg/LVery hard
- Troy240 mg/LVery hard
Hardness data: TapWaterData US Water Hardness (utility report, December 23, 2024), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.