Hard water in Coon Rapids, MN
Reported by Coon Rapids · May 2024
- MN typical
- 160 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Utility report
The water in Coon Rapids carries roughly 201 mg/L of dissolved calcium and magnesium, or 11.8 grains per gallon. That is very hard water. The number comes from Coon Rapids, dated May 2024.
At 201 mg/L, Coon Rapids is 41 mg/L above the typical Minnesota figure of 160. Of the 10 nearest cities we track, 6 have softer water and 3 have harder. The range nearby runs from 39 mg/L in Lino Lakes to 254 in St. Anthony.
What 201 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 201 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 × 11.8 gpg = 2,644 grains a day. A 24,000-grain unit regenerates about every 9 days.
EPA record for Coon Rapids's water system
No health-based violations since 2016
Serves about 63,599 people from groundwater.
- Health-based
- 0
- Monitoring or reporting
- 0
- 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 Coon Rapids water hard?
Yes. It measures about 201 mg/L (11.8 grains per gallon), which the USGS classes as very hard.
What is the water hardness in Coon Rapids in grains per gallon?
About 11.8 gpg. One grain per gallon equals 17.1 mg/L, so 201 mg/L divided by 17.1 gives 11.8.
What size water softener do I need in Coon Rapids?
For 3 people using 75 gallons each per day, 11.8 gpg works out to about 2,644 grains a day. A 24,000-grain softener covers that with a regeneration about every 9 days.
Has the Coon Rapids water system had EPA violations?
EPA records show no health-based violations for Coon Rapids since 2016.
Nearby cities
- Champlin234 mg/LVery hard
- Brooklyn Park120 mg/LModerately hard
- Blaine191 mg/LVery hard
- Andover200 mg/LVery hard
- Brooklyn Center79 mg/LModerately hard
- New Brighton230 mg/LVery hard
- Lino Lakes39 mg/LSoft
- Robbinsdale201 mg/LVery hard
- Shoreview192 mg/LVery hard
- St. Anthony254 mg/LVery hard
Hardness data: TapWaterData US Water Hardness (utility report, May 2, 2024), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.