Water hardness in Fountain Hills
16 gpg very hard
Tap water in Fountain Hills is very hard: 16 gpg (274 mg/L · 15.3 °dH · 27.4 °fH).
Source: EPCOR Chaparral Water System 2022 Water Quality Report (2022) · data checked 2026-11-02
This figure is over 3 years old; hardness may have changed.
EPCOR Water Arizona's Chaparral system, which serves Fountain Hills, reported 273.9 mg/L in its 2022 water quality report. That is very hard. The report gives no range, so treat this as one published figure from 2022. White scale on glass and fixtures is common at this level.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 16 gpg |
|---|---|
| Utility | EPCOR Water Arizona (Chaparral system) |
How Fountain Hills compares
- Tap water in Fountain Hills is 77 % harder than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 319 of 1372 in the United States (1 = hardest); 77 % of these cities have softer water.
- In Arizona it is number 1 of 12 cities; the regional median is 13 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 Fountain Hills
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 15 °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 Fountain Hills water hard or soft?
It is very hard: 274 mg/L as CaCO₃ (16 gpg, 15.3 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Fountain 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 Fountain Hills water?
16 gpg, equal to 15.3 °dH, 27.4 °fH or 274 mg/L calcium carbonate.
What dishwasher salt setting should I use in Fountain Hills?
For 274 mg/L (15.3 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Fountain Hills?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: EPCOR Chaparral Water System 2022 Water Quality Report (2022). Method: figure published by the water supplier. EPCOR Chaparral Water System 2022 Water Quality Report · Outdated figure? Tell us