Water hardness in Inver Grove Heights
21.6 gpg very hard
Tap water in Inver Grove Heights is very hard: 21.6 gpg (370 mg/L · 20.7 °dH · 37 °fH).
Source: City of Inver Grove Heights 2024 Drinking Water Quality Report (2024) · data checked 2026-11-02
The City of Inver Grove Heights reports 370 mg/L as CaCO3 in its 2024 drinking water quality report. That is very hard water. Expect visible scale on fixtures and in water heaters, and consider a softener sized for this level.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 21.6 gpg |
|---|---|
| Utility | City of Inver Grove Heights |
How Inver Grove Heights compares
- Tap water in Inver Grove Heights is 139 % harder than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 90 of 1372 in the United States (1 = hardest); 93 % of these cities have softer water.
- In Minnesota it is number 4 of 23 cities; the regional median is 17 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 Inver Grove Heights
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 21 °dH |
| AEG / Electrolux | 5 |
| Beko | 6th |
| 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 Inver Grove Heights water hard or soft?
It is very hard: 370 mg/L as CaCO₃ (21.6 gpg, 20.7 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Inver Grove Heights 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 Inver Grove Heights water?
21.6 gpg, equal to 20.7 °dH, 37 °fH or 370 mg/L calcium carbonate.
What dishwasher salt setting should I use in Inver Grove Heights?
For 370 mg/L (20.7 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Inver Grove Heights?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: City of Inver Grove Heights 2024 Drinking Water Quality Report (2024). Method: figure published by the water supplier. City of Inver Grove Heights 2024 Drinking Water Quality Report · Outdated figure? Tell us