Water hardness by state
How hard is the water in California?
Tap water in California averages 9.5 grains per gallon (163 ppm calcium carbonate). That number determines how fast limescale coats your water heater, shower glass and appliances.
Based on 2,203 measurements from 1449 monitoring sites, 2018-01 → 2023-08.
Water hardness by county in California
Medians of the individual measurements recorded in each county. Hardness varies far more within a state than between neighbouring states — this is where your own figure actually comes from.
| County | gpg | mg/L | Range (mg/L) | Classification |
|---|---|---|---|---|
| San Bernardino County | 7.6 | 130 | 28–343 | Soft water |
| Mono County | 5.6 | 95 | 75–196 | Soft water |
| Santa Barbara County | 31 | 530 | 268–1370 | Very hard water |
| Riverside County | 10.6 | 182 | 46–344 | Moderately hard water |
| Imperial County | 4.3 | 73 | 28–309 | Soft water |
| Los Angeles County | 10.6 | 182 | 55–525 | Moderately hard water |
| Kern County | 10.6 | 181 | 65–881 | Moderately hard water |
| Stanislaus County | 9.4 | 160 | 44–340 | Moderately hard water |
| San Joaquin County | 8.8 | 150 | 57–301 | Moderately hard water |
| San Luis Obispo County | 31.4 | 537 | 116–875 | Very hard water |
| Merced County | 7.7 | 132 | 30–369 | Soft water |
| San Diego County | 29.8 | 509 | 33–1490 | Very hard water |
Range shown is the 10th-90th percentile of local measurements. Counties with fewer than five samples are omitted rather than estimated.
What 9.5 gpg means in California
At this level limescale builds up slowly but steadily. White traces appear on faucets and shower glass within months, and the water heater loses a little efficiency every year. Light protection already pays off.
What it does to your home
Water heater: even a thin layer of scale insulates the heating element and drives energy use up.
Appliances: dishwashers, washing machines and coffee makers scale up and fail years early.
Fixtures and skin: white spots on faucets and glass, dry skin and dull hair after every shower.
How this figure was obtained
Median of the site-level medians at 1449 groundwater monitoring sites (wells and springs — the sources most US public systems draw from) in the USGS National Water Information System (2,203 individual measurements, 2018-01 → 2023-08). Each site is collapsed to one value first so that a heavily sampled location cannot skew the state figure; the range shown is the 10th-90th percentile across sites. This describes the raw water resource, not a specific municipal tap after treatment.
Water Quality Portal — USGS National Water Information System (NWIS), characteristic "Hardness, Ca, Mg"Statewide average — hardness varies by utility and season. Always verify with your local water quality report.
Frequently asked questions — California
Is 9.5 gpg considered hard water?
On the US scale, 0–3.5 gpg is soft, 3.5–7 gpg moderately hard, 7–10.5 gpg hard and above 10.5 gpg very hard. At 9.5 gpg (163 ppm), water in California is classified as Moderately hard water.
Does California have a limescale problem?
Water in California averages 9.5 gpg — Moderately hard water. The harder the water, the faster calcium carbonate deposits build up in water heaters, appliances and pipes. Below 3.5 gpg the risk is minimal; above 7 gpg scale becomes a running cost.
How do I find the exact water hardness at my address in California?
Check your utility's annual water quality report (Consumer Confidence Report) or your water bill, or use our free interactive hardness map. Hardness can vary widely between neighboring utilities in California.
Do I need a salt-based water softener at 9.5 gpg?
Not necessarily. Salt softeners add sodium to your water and need constant refills. LIMPEO treats limescale with an electromagnetic field — no salt, no chemicals, no maintenance — and keeps healthy minerals in your drinking water.