Rancho Mirage Water Hardness & Quality Report (2026)
Water Hardness
7.8 grains per gallon
Source
mixed
pH Level
7.9
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
361.9 mg/L
Est. Daily Cost
$0.35
energy & soap waste
Source: USGS Water Quality Portal · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Rancho Mirage, your appliances are currently losing 18% efficiency due to mineral buildup.
| Appliance | In Rancho Mirage | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.2 yrs | 8.5 yrs | -39% |
| Washing Machine | 8.7 yrs | 12 yrs | -28% |
| Water Heater | 10.3 yrs | 15 yrs | -31% |
Regional Water Comparison
How Rancho Mirage compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Rancho Mirage, California | 133 mg/L | 5.7 ppt | 🟠 Hard | mixed |
| Palm Desert, California | 118.5 mg/L | 5.3 ppt | 🟡 Moderately Hard | mixed |
| Cathedral City, California | 171 mg/L | 6.8 ppt | 🟠 Hard | mixed |
| La Quinta, California | 50.5 mg/L | 3.3 ppt | 🟢 Soft | mixed |
| Palm Springs, California | 121 mg/L | 5.3 ppt | 🟠 Hard | mixed |
National Benchmark
How Rancho Mirage compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Rancho Mirage | 133 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Rancho Mirage's Water Unique?
Local geology and source profile
Rancho Mirage, California, in Riverside County — a Riverside County city adjacent to Palm Desert and Palm Springs in the Coachella Valley, an upscale desert resort city in the Sonoran Desert — receives its municipal water from the Desert Water Agency (DWA), drawing from the State Water Project (Coachella Valley branch of the Colorado River Aqueduct) and the Coachella Valley groundwater aquifer.
The moderately hard 133 mg/L hardness and TDS of 361.9 mg/L reflect the Coachella Valley's blended supply character. The State Water Project water (originating in the Sacramento-San Joaquin Delta — soft) dilutes the harder Coachella Valley groundwater. The Coachella Valley aquifer is developed in Quaternary desert alluvial fan deposits from the Santa Rosa Mountains and San Jacinto Mountains — calcareous desert alluvium with caliche (calcium carbonate hardpan). The SWP dilution ratio determines the final hardness observed at Rancho Mirage.
At 133 mg/L, Rancho Mirage's water is moderately hard — scale builds in kettles and appliances over months, dishwashers benefit from rinse aid, and bathroom fixtures develop calcium deposits. Quarterly descaling is appropriate. The PFAS level of 5.7 ppt warrants a certified drinking water filter — the March Air Reserve Base (Riverside County — AFFF in the Santa Ana-Whitewater River watershed), the Coachella Valley urban PFAS corridor, and the Colorado River PFAS background contribute to Rancho Mirage's readings.
Geology & Source: Rancho Mirage in Riverside County draws from the Desert Water Agency on the State Water Project (Colorado River Aqueduct, Coachella Valley) and Coachella Valley groundwater (Quaternary desert alluvial aquifer, calcareous caliche) — California Coachella Valley SWP-desert alluvium blended supply produces moderately hard water at 133 mg/L with TDS 361.9 mg/L in this Riverside County California city.