Water hardness in Rewey
16.3 gpg very hard
Tap water in Rewey is very hard: 16.3 gpg (279 mg/L · 15.6 °dH · 27.9 °fH).
Source: Wisconsin DNR Drinking Water System portal (Rewey Waterworks) (2026) · data checked 2026-10-20
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 16.3 gpg |
|---|---|
| Utility | Rewey Waterworks |
How Rewey compares
- Tap water in Rewey is 80 % harder than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 308 of 1372 in the United States (1 = hardest); 78 % of these cities have softer water.
- In Wisconsin it is number 189 of 448 cities; the regional median is 14.3 gpg.
- Nearest city with clearly softer water: Muscoda, 38 km away (12.8 gpg).
- Nearest city with clearly harder water: Mineral Point, 18 km away (24.2 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 Rewey
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 16 °dH |
| AEG / Electrolux | 4 |
| Beko | 4th |
| Hoover | S2 |
| 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 Rewey water hard or soft?
It is very hard: 279 mg/L as CaCO₃ (16.3 gpg, 15.6 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Rewey 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 Rewey water?
16.3 gpg, equal to 15.6 °dH, 27.9 °fH or 279 mg/L calcium carbonate.
What dishwasher salt setting should I use in Rewey?
For 279 mg/L (15.6 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Rewey?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Wisconsin DNR Drinking Water System portal (Rewey Waterworks) (2026). Method: figure published by the water supplier. Wisconsin DNR Drinking Water System portal (Rewey Waterworks) · Outdated figure? Tell us