Water hardness in Green Lake
23 gpg very hard
Tap water in Green Lake is very hard: 23 gpg (395 mg/L · 22.1 °dH · 39.5 °fH).
Source: Wisconsin DNR Drinking Water System portal (Green Lake Waterworks) (2026) · data checked 2026-10-20
Range across supply zones: 351–438 mg/L.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 23 gpg |
|---|---|
| Utility | Green Lake Waterworks |
How Green Lake compares
- Tap water in Green Lake is 154 % harder than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 61 of 1372 in the United States (1 = hardest); 96 % of these cities have softer water.
- In Wisconsin it is number 33 of 448 cities; the regional median is 14.3 gpg.
- Nearest city with clearly softer water: Berlin, 14 km away (14.6 gpg).
- Nearest city with clearly harder water: Kaukauna, 73 km away (36.8 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 Green Lake
| Brand | Setting for this water |
|---|---|
| Bosch | H06 |
| Miele | 22 °dH |
| AEG / Electrolux | 5 |
| Beko | 6th |
| Hoover | S3 |
| LG | H4 |
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 Green Lake water hard or soft?
It is very hard: 395 mg/L as CaCO₃ (23 gpg, 22.1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Green Lake 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 Green Lake water?
23 gpg, equal to 22.1 °dH, 39.5 °fH or 395 mg/L calcium carbonate.
What dishwasher salt setting should I use in Green Lake?
For 395 mg/L (22.1 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Green Lake?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Wisconsin DNR Drinking Water System portal (Green Lake Waterworks) (2026). Method: figure published by the water supplier. Wisconsin DNR Drinking Water System portal (Green Lake Waterworks) · Outdated figure? Tell us