Water hardness in Millcreek
10.2 gpg hard
Tap water in Millcreek is hard: 10.2 gpg (175 mg/L · 9.8 °dH · 17.5 °fH).
Source: Salt Lake City Public Utilities - Drinking Water Quality Report 2026 (2025 data) (2026) · data checked 2026-10-23
Range across supply zones: 136–571 mg/L.
7 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| gpg | mg/L | ||
|---|---|---|---|
| Big Cottonwood WTP | 7.9 | 136 | hard |
| City Creek WTP | 12.4 | 212 | very hard |
| Jordan Valley Water Conservancy District | 10.8 | 184 | very hard |
| MWDSLS Little Cottonwood WTP | 8.9 | 152 | hard |
| MWDSLS Point of the Mountain WTP | 9.6 | 164 | hard |
| Parleys WTP | 10.2 | 175 | hard |
| SLC wells & springs | 21.2 | 363 | very hard |
Salt Lake City Public Utilities is the main supplier in Millcreek, though other providers serve parts of the city. Its supply mixes snowmelt from Wasatch canyon creeks, valley wells and springs, and treated regional water, so the 7 zones span 136 to 571 mg/L CaCO₃ with a median of 175 mg/L. Ask which provider and zone serve your address before choosing a softener.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 10.2 gpg |
|---|---|
| Utility | Salt Lake City Public Utilities (main supplier to Millcreek; other providers serve parts of the city) |
How Millcreek compares
- Tap water in Millcreek is 13 % harder than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 610 of 1372 in the United States (1 = hardest); 55 % of these cities have softer water.
- In Utah it is number 10 of 14 cities; the regional median is 10.9 gpg.
- Nearest city with clearly harder water: Herriman, 27 km away (37.5 gpg).
Ranking of the hardest and softest water in the United States →
What it means at home
- Fast scale on taps, shower screens and kettle; white spots on glassware.
- Water heater: efficiency loss and element failures within years if unprotected.
- Dry skin and dull hair after showering are common.
- Softener recommended; jug or reverse osmosis for drinking.
How much salt will you use for softening?
Recommended, especially with a heater or boiler: scale cuts efficiency and shortens its life.
Descale a coffee machine or kettle about every 2 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Millcreek
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 10 °dH |
| AEG / Electrolux | 2 |
| Beko | 3rd |
| Hoover | S2 |
| LG | H2 |
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 Millcreek water hard or soft?
It is hard: 175 mg/L as CaCO₃ (10.2 gpg, 9.8 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Millcreek 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 Millcreek water?
10.2 gpg, equal to 9.8 °dH, 17.5 °fH or 175 mg/L calcium carbonate.
What dishwasher salt setting should I use in Millcreek?
For 175 mg/L (9.8 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Millcreek?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: Salt Lake City Public Utilities - Drinking Water Quality Report 2026 (2025 data) (2026). Method: figure published by the water supplier. Salt Lake City Public Utilities - Drinking Water Quality Report 2026 (2025 data) · Outdated figure? Tell us