Water hardness in Santa Clarita
19.6 gpg very hard
Tap water in Santa Clarita is very hard: 19.6 gpg (335 mg/L · 18.8 °dH · 33.5 °fH).
Source: California SWRCB Division of Drinking Water, EDT lab results, system CA1910240 (2026-06) · data checked 2026-10-19
Range across supply zones: 110–472 mg/L.
4 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| gpg | mg/L | ||
|---|---|---|---|
| Santa Clarita Valley W.A.-Newhall Div. | 16.9 | 290 | very hard |
| Santa Clarita Valley W.A.-Pinetree Div. | 22.2 | 380 | very hard |
| Santa Clarita Valley W.A.-Santa Clarita | 23.9 | 410 | very hard |
| Santa Clarita Valley Water Agency | 8.8 | 150 | hard |
Four systems serve Santa Clarita in State Water Resources Control Board lab data. The Santa Clarita Valley Water Agency treatment plants read 150 mg/L as CaCO3 (8.8 gpg), while the agency's older well-fed systems read 410, 380 and 290 mg/L. The page shows the median of the four, and results run from 110 to 472 mg/L, so hardness depends on which system serves your street. Check that before you size a softener.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 19.6 gpg |
|---|---|
| Utility | Santa Clarita Valley Water Agency |
How Santa Clarita compares
- Tap water in Santa Clarita is 116 % harder than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 162 of 1372 in the United States (1 = hardest); 88 % of these cities have softer water.
- In California it is number 31 of 336 cities; the regional median is 9.5 gpg.
- Nearest city with clearly softer water: San Fernando, 15 km away (14.6 gpg).
- Nearest city with clearly harder water: Piru, 27 km away (37.8 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 Santa Clarita
| 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 Santa Clarita water hard or soft?
It is very hard: 335 mg/L as CaCO₃ (19.6 gpg, 18.8 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Santa Clarita 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 Santa Clarita water?
19.6 gpg, equal to 18.8 °dH, 33.5 °fH or 335 mg/L calcium carbonate.
What dishwasher salt setting should I use in Santa Clarita?
For 335 mg/L (18.8 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Santa Clarita?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: California SWRCB Division of Drinking Water, EDT lab results, system CA1910240 (2026-06). Method: own measurement. California SWRCB Division of Drinking Water, EDT lab results, system CA1910240 · Outdated figure? Tell us