Water hardness in Eagan
19.1 gpg very hard
Tap water in Eagan is very hard: 19.1 gpg (328 mg/L · 18.3 °dH · 32.8 °fH).
Source: City of Eagan Drinking Water Quality Report 2025 (attribute City of Eagan) (2025) · data checked 2026-10-20
Range across supply zones: 310–345 mg/L.
The City of Eagan 2025 water quality report gives a range rather than an average: 18 to 20 grains per gallon, or 310 to 345 mg/L. The page shows the midpoint of 327.5 mg/L (19.2 gpg), which is very hard. The report treats the whole city as one figure, with no zone breakdown. At this level scale builds quickly in water heaters and on fixtures, and a softener is a common choice.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 19.1 gpg |
|---|
How Eagan compares
- Tap water in Eagan is 111 % harder than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 179 of 1372 in the United States (1 = hardest); 87 % of these cities have softer water.
- In Minnesota it is number 7 of 23 cities; the regional median is 17 gpg.
- Nearest city with clearly softer water: Mendota Heights, 9 km away (5.3 gpg).
- Nearest city with clearly harder water: Burnsville, 10 km away (25.5 gpg).
Ranking of the hardest and softest water in the United States →
What it means at home
- Severe scale: heater elements and washing-machine heaters fail early.
- Detergent use is very high; taps and screens coat within days.
- Dishwasher at maximum salt setting.
- An ion-exchange softener is practically essential; RO for drinking water.
How much salt will you use for softening?
Yes. At this hardness a softener pays for itself through appliance life and detergent.
Descale a coffee machine or kettle about every 1 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Eagan
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 18 °dH |
| AEG / Electrolux | 4 |
| Beko | 5th |
| Hoover | S3 |
| LG | H3 |
From each brand's manual for the model family named in the source; your model may differ, so check its manual. All brands and how to change the setting →
FAQ
Is Eagan water hard or soft?
It is very hard: 328 mg/L as CaCO₃ (19.1 gpg, 18.3 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Eagan safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
How many grains per gallon is Eagan water?
19.1 gpg, equal to 18.3 °dH, 32.8 °fH or 328 mg/L calcium carbonate.
What dishwasher salt setting should I use in Eagan?
For 328 mg/L (18.3 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Eagan?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: City of Eagan Drinking Water Quality Report 2025 (attribute City of Eagan) (2025). Method: figure published by the water supplier. City of Eagan Drinking Water Quality Report 2025 (attribute City of Eagan) · Outdated figure? Tell us