Water hardness in Scottsdale AZ
14.6 gpg very hard
Tap water in Scottsdale AZ is very hard: 14.6 gpg (250 mg/L · 14 °dH · 25 °fH).
Source: City of Scottsdale 2026 Water Quality Report (2025 data), p4 Approximate Hardness Levels (2026) · data checked 2026-10-21
Range across supply zones: 215–290 mg/L.
5 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| gpg | mg/L | ||
|---|---|---|---|
| Indian School Road to Chaparral Road | 14.6 | 250 | very hard |
| North of Chaparral Road | 15.2 | 260 | very hard |
| north of Chaparral Road | 15.2 | 260 | very hard |
| South of Indian School Road | 14.3 | 245 | very hard |
| south of Indian School Road | 14.3 | 245 | very hard |
Scottsdale gets most of its water from the Central Arizona Project (Colorado River), with smaller shares from the Salt River Project and local groundwater. The city divides its service area into 5 zones; hardness runs from 215 to 290 mg/L with a figure of 250 mg/L CaCO₃ overall. Very hard water means scale on pool equipment, fixtures and heaters.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 14.6 gpg |
|---|---|
| Utility | City of Scottsdale Water |
How Scottsdale AZ compares
- Tap water in Scottsdale AZ is 61 % harder than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 372 of 1372 in the United States (1 = hardest); 73 % of these cities have softer water.
- In Arizona it is number 3 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 Scottsdale AZ
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 14 °dH |
| AEG / Electrolux | 3 |
| 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 Scottsdale AZ water hard or soft?
It is very hard: 250 mg/L as CaCO₃ (14.6 gpg, 14 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Scottsdale AZ 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 Scottsdale AZ water?
14.6 gpg, equal to 14 °dH, 25 °fH or 250 mg/L calcium carbonate.
What dishwasher salt setting should I use in Scottsdale AZ?
For 250 mg/L (14 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Scottsdale AZ?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: City of Scottsdale 2026 Water Quality Report (2025 data), p4 Approximate Hardness Levels (2026). Method: computed from supplier's calcium and magnesium. City of Scottsdale 2026 Water Quality Report (2025 data), p4 Approximate Hardness Levels · Outdated figure? Tell us