Water hardness in Mendota Heights
5.3 gpg moderately hard
Tap water in Mendota Heights is moderately hard: 5.3 gpg (90 mg/L · 5 °dH · 9 °fH).
Source: Saint Paul Regional Water Services April 2025 Mineral Report (2025-04) · data checked 2026-11-03
Mendota Heights is served by Saint Paul Regional Water Services, and the 90 mg/L (5.3 gpg) figure comes from a single sample in the utility's April 2025 mineral report. One sample does not show seasonal change, so the annual average may differ. The utility's later reports will show whether the figure holds.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 5.3 gpg |
|---|---|
| Utility | Saint Paul Regional Water Services (SPRWS), serves Mendota Heights |
How Mendota Heights compares
- Tap water in Mendota Heights is 42 % softer than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 1061 of 1372 in the United States (1 = hardest); 22 % of these cities have softer water.
- In Minnesota it is number 20 of 23 cities; the regional median is 17 gpg.
- Nearest city with clearly softer water: Colfax, 111 km away (1.2 gpg).
- Nearest city with clearly harder water: Eagan, 9 km away (19.1 gpg).
Ranking of the hardest and softest water in the United States →
What it means at home
- Visible kettle scale every few weeks; vinegar or citric acid is enough.
- Water heater and washing machine: some long-term scale; a scale inhibitor slows it.
- Dishwasher: medium salt setting.
- Softener optional; pays off mainly with a gas boiler or tankless heater.
How much salt will you use for softening?
Optional. A scale inhibitor or a small softener protects the heater; soap savings are modest.
Descale a coffee machine or kettle about every 3 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Mendota Heights
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 5 °dH |
| AEG / Electrolux | 2 |
| Beko | 2nd |
| Hoover | S1 |
| LG | H1 |
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 Mendota Heights water hard or soft?
It is moderately hard: 90 mg/L as CaCO₃ (5.3 gpg, 5 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Mendota 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 Mendota Heights water?
5.3 gpg, equal to 5 °dH, 9 °fH or 90 mg/L calcium carbonate.
What dishwasher salt setting should I use in Mendota Heights?
For 90 mg/L (5 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Mendota Heights?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Saint Paul Regional Water Services April 2025 Mineral Report (2025-04). Method: figure published by the water supplier. Saint Paul Regional Water Services April 2025 Mineral Report · Outdated figure? Tell us