Water hardness in San Jacinto
8.2 gpg hard
Tap water in San Jacinto is hard: 8.2 gpg (140 mg/L · 7.8 °dH · 14 °fH).
Source: California SWRCB Division of Drinking Water, EDT lab results, system CA3310032 (2025-08) · data checked 2026-10-19
Range across supply zones: 114–210 mg/L.
The San Jacinto figure comes from State Water Resources Control Board lab results for the city's own water system, which serves only part of San Jacinto. The median of 17 results from 2022 to 2025, taken at 3 well points, is 140 mg/L as CaCO3 (8.2 gpg), with a range of 114.2 to 210.4 mg/L. Other suppliers cover the rest. The water is hard.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 8.2 gpg |
|---|---|
| Utility | San Jacinto, City Of |
How San Jacinto compares
- Tap water in San Jacinto is 10 % softer than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 760 of 1372 in the United States (1 = hardest); 43 % of these cities have softer water.
- In California it is number 202 of 336 cities; the regional median is 9.5 gpg.
- Nearest city with clearly softer water: Menifee, 21 km away (5.7 gpg).
- Nearest city with clearly harder water: Hemet, 7 km away (18.1 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 San Jacinto
| Brand | Setting for this water |
|---|---|
| Bosch | H01 |
| Miele | 8 °dH |
| AEG / Electrolux | 2 |
| Beko | 3rd |
| Hoover | S1 |
| 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 San Jacinto water hard or soft?
It is hard: 140 mg/L as CaCO₃ (8.2 gpg, 7.8 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in San Jacinto 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 San Jacinto water?
8.2 gpg, equal to 7.8 °dH, 14 °fH or 140 mg/L calcium carbonate.
What dishwasher salt setting should I use in San Jacinto?
For 140 mg/L (7.8 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in San Jacinto?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: California SWRCB Division of Drinking Water, EDT lab results, system CA3310032 (2025-08). Method: own measurement. California SWRCB Division of Drinking Water, EDT lab results, system CA3310032 · Outdated figure? Tell us