How hard is the water in Eden Prairie, MN?

Tap water hardness
99mg/L
5.8gpg
Moderately hard

Reported by Eden Prairie · September 2025

MN typical
160 mg/L
EPA health violations since 2016
0
Softener for 3 people
24k grain
Data
Utility report

Tap water in Eden Prairie has about 99 mg/L of hardness, which is 5.8 grains per gallon. On the USGS scale that counts as moderately hard. The number comes from Eden Prairie, dated September 2025.

Eden Prairie on the hardness scale, with nearby cities
060120180240300360+MN typical 160Bloomington: 100 mg/LBloomington 100St. Louis Park: 112 mg/LSt. Louis Park 112Chanhassen: 121 mg/LChanhassen 121Edina: 146 mg/LEdina 146Hopkins: 163 mg/LHopkins 163Minnetonka: 186 mg/LMinnetonka 186Prior Lake: 196 mg/LPrior Lake 196Chaska: 230 mg/LChaska 230Savage: 310 mg/LSavage 310Shakopee: 420 mg/LShakopee 420Eden Prairie 99mg/L as calcium carbonate060120180240300360+MN 160Bloomington: 100 mg/LBloomington 100Chanhassen: 121 mg/LChanhassen 121Edina: 146 mg/LEdina 146Hopkins: 163 mg/LHopkins 163Minnetonka: 186 mg/LMinnetonka 186Shakopee: 420 mg/LShakopee 42099 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

At 99 mg/L, Eden Prairie is 61 mg/L below the typical Minnesota figure of 160. None of the 10 nearest cities we track has softer water. The range nearby runs from 100 mg/L in Bloomington to 420 in Shakopee.

What 99 mg/L means at home

You may see faint white spots on glasses and shower doors after the water dries.

Scale builds up slowly. A kettle or coffee maker needs descaling now and then, maybe every few months.

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

Optional. Plenty of households at this level live with it and descale the kettle now and then.

Water softener

Worth a look if spots on glass bother you, or if your tankless water heater manual asks for softer water.

Carbon filter

Improves taste and removes chlorine. It leaves calcium and magnesium in place.

Softener size for Eden Prairie

3 people × 75 gallons a day × 5.8 gpg = 1,300 grains a day. A 24,000-grain unit regenerates about every 18 days.

Size it for your household

EPA record for Eden Prairie's water system

Eden Prairie · PWSID MN1270010

No health-based violations since 2016

Serves about 63,726 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 Eden Prairie water hard?

Somewhat. It measures about 99 mg/L (5.8 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in Eden Prairie in grains per gallon?

About 5.8 gpg. One grain per gallon equals 17.1 mg/L, so 99 mg/L divided by 17.1 gives 5.8.

What size water softener do I need in Eden Prairie?

For 3 people using 75 gallons each per day, 5.8 gpg works out to about 1,300 grains a day. A 24,000-grain softener covers that with a regeneration about every 18 days.

Has the Eden Prairie water system had EPA violations?

EPA records show no health-based violations for Eden Prairie since 2016.

Nearby cities

All 57 cities in Minnesota

Hardness data: TapWaterData US Water Hardness (utility report, September 15, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.