Water hardness in Short Hills
20 gpg very hard
Tap water in Short Hills is very hard: 20 gpg (342 mg/L · 19.2 °dH · 34.2 °fH).
Source: New Jersey American Water, water quality report (Short Hills) (2024) · data checked 2026-10-20
Range across supply zones: 52–342 mg/L.
New Jersey American Water's Short Hills system serves several northern New Jersey suburbs from more than one supply. The mix of supplies explains the wide range of 52–342 mg/L, with Short Hills at the top at 342 mg/L CaCO₃, which is extremely hard. Check your own address; a softener is likely worthwhile at the high end.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 20 gpg |
|---|---|
| Utility | New Jersey American Water |
How Short Hills compares
- Tap water in Short Hills is 121 % harder than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 148 of 1372 in the United States (1 = hardest); 89 % of these cities have softer water.
- In New Jersey it is number 1 of 34 cities; the regional median is 6.4 gpg.
- Nearest city with clearly softer water: South Orange, 5 km away (12.4 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 Short Hills
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 19 °dH |
| AEG / Electrolux | 5 |
| 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 Short Hills water hard or soft?
It is very hard: 342 mg/L as CaCO₃ (20 gpg, 19.2 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Short Hills 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 Short Hills water?
20 gpg, equal to 19.2 °dH, 34.2 °fH or 342 mg/L calcium carbonate.
What dishwasher salt setting should I use in Short Hills?
For 342 mg/L (19.2 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Short Hills?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: New Jersey American Water, water quality report (Short Hills) (2024). Method: figure published by the water supplier. New Jersey American Water, water quality report (Short Hills) · Outdated figure? Tell us