Water hardness in Piru
37.8 gpg very hard
Tap water in Piru is very hard: 37.8 gpg (647 mg/L · 36.2 °dH · 64.7 °fH).
Source: California American Water, water quality report (Piru) (2024) · data checked 2026-10-21
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 37.8 gpg |
|---|---|
| Utility | California American Water |
How Piru compares
- Tap water in Piru is 317 % harder than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 1 of 1372 in the United States (1 = hardest); 100 % of these cities have softer water.
- In California it is number 1 of 336 cities; the regional median is 9.5 gpg.
- Nearest city with clearly softer water: Fillmore, 11 km away (24.4 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 Piru
| Brand | Setting for this water |
|---|---|
| Bosch | H07 |
| Miele | 36 °dH |
| AEG / Electrolux | 7 |
| Beko | 6th |
| Hoover | S5 |
| LG | H4 |
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 Piru water hard or soft?
It is very hard: 647 mg/L as CaCO₃ (37.8 gpg, 36.2 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Piru 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 Piru water?
37.8 gpg, equal to 36.2 °dH, 64.7 °fH or 647 mg/L calcium carbonate.
What dishwasher salt setting should I use in Piru?
For 647 mg/L (36.2 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Piru?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: California American Water, water quality report (Piru) (2024). Method: figure published by the water supplier. California American Water, water quality report (Piru) · Outdated figure? Tell us