Hard water in Lake Elmo, MN
Reported by Lake Elmo · June 2024
- MN typical
- 160 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Utility report
The water in Lake Elmo carries roughly 249 mg/L of dissolved calcium and magnesium, or 14.6 grains per gallon. That is very hard water. The number comes from Lake Elmo, dated June 2024.
Lake Elmo sits 89 mg/L above the typical Minnesota figure of 160. Of the 10 nearest cities we track, 8 have softer water and 2 have harder. The range nearby runs from 39 mg/L in Lino Lakes to 330 in Cottage Grove.
What 249 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 249 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 × 14.6 gpg = 3,276 grains a day. A 24,000-grain unit regenerates about every 7 days.
EPA record for Lake Elmo's water system
No health-based violations since 2016
Serves about 10,978 people from groundwater.
- Health-based
- 0
- Monitoring or reporting
- 14
- 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 Lake Elmo water hard?
Yes. It measures about 249 mg/L (14.6 grains per gallon), which the USGS classes as very hard.
What is the water hardness in Lake Elmo in grains per gallon?
About 14.6 gpg. One grain per gallon equals 17.1 mg/L, so 249 mg/L divided by 17.1 gives 14.6.
What size water softener do I need in Lake Elmo?
For 3 people using 75 gallons each per day, 14.6 gpg works out to about 3,276 grains a day. A 24,000-grain softener covers that with a regeneration about every 7 days.
Has the Lake Elmo water system had EPA violations?
EPA records show no health-based violations for Lake Elmo since 2016. There were also 14 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- North St. Paul56 mg/LSoft
- Woodbury160 mg/LHard
- Mahtomedi162 mg/LHard
- Maplewood56 mg/LSoft
- St. Paul82 mg/LModerately hard
- Cottage Grove330 mg/LVery hard
- Roseville78 mg/LModerately hard
- Shoreview192 mg/LVery hard
- Inver Grove Heights270 mg/LVery hard
- Lino Lakes39 mg/LSoft
Hardness data: TapWaterData US Water Hardness (utility report, June 18, 2024), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.