Casa de Oro-Mount Helix Water Hardness & Quality Report (2026)
Water Hardness
4.5 grains per gallon
Source
mixed
pH Level
7.5
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
179.8 mg/L
Est. Daily Cost
$0.21
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 Casa de Oro-Mount Helix, your appliances are currently losing 10% efficiency due to mineral buildup.
| Appliance | In Casa de Oro-Mount Helix | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7 yrs | 8.5 yrs | -18% |
| Washing Machine | 10.7 yrs | 12 yrs | -11% |
| Water Heater | 12.5 yrs | 15 yrs | -17% |
Regional Water Comparison
How Casa de Oro-Mount Helix compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Casa de Oro-Mount Helix, California | 77.5 mg/L | 4.1 ppt | 🟡 Moderately Hard | mixed |
| El Cajon, California | 183.5 mg/L | 7.2 ppt | 🔴 Very Hard | mixed |
| Spring Valley, California | 91.5 mg/L | 4.5 ppt | 🟡 Moderately Hard | mixed |
| Rancho San Diego, California | 135 mg/L | 5.8 ppt | 🟠 Hard | mixed |
| Bostonia, California | 191 mg/L | 7.4 ppt | 🔴 Very Hard | mixed |
National Benchmark
How Casa de Oro-Mount Helix compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Casa de Oro-Mount Helix | 77.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Casa de Oro-Mount Helix's Water Unique?
Local geology and source profile
Casa de Oro-Mount Helix, California, in San Diego County — an unincorporated San Diego County community adjacent to El Cajon and Spring Valley, a hillside suburban community on the east side of metropolitan San Diego at the base of the Peninsular Range foothills — receives its municipal water from the Padre Dam Water District or the Helix Water District, drawing from the Colorado River aqueduct (via the Metropolitan Water District of Southern California and the San Diego County Water Authority) blended with local reservoirs such as San Vicente Reservoir in the Lakeside watershed.
The soft 77.5 mg/L hardness and TDS of 179.8 mg/L reflect the blended supply — lower than the straight Colorado River hardness (El Centro CA: 273 mg/L) because the San Diego blended supply mixes the harder Colorado River water with softer locally collected Peninsular Range surface water from the San Vicente and El Capitan drainages. The Cretaceous La Posta and Woodson Mountain Tonalite (largely insoluble crystalline rock) of the eastern San Diego county watershed dilute the harder Colorado River supply.
At 77.5 mg/L, Casa de Oro-Mount Helix's water is soft — essentially no scale forms, soap lathers abundantly, and appliances maintain good efficiency. Annual descaling is sufficient. The PFAS level of 4.1 ppt warrants a certified drinking water filter — the Colorado River AFFF legacy (Arizona-Nevada military bases in the drainage), the San Diego east county military-industrial corridor, and the San Diego County PFAS background contribute to the readings.
Geology & Source: Casa de Oro-Mount Helix in San Diego County draws from the Padre Dam Water District on the Colorado River aqueduct and San Vicente Reservoir (San Diego County) — the Colorado River crosses the Mojave-Sonoran Desert (evaporite calcareous) and the San Vicente drains the Peninsular Ranges (Cretaceous La Posta Tonalite) — Colorado River-Peninsular Ranges blended supply produces soft water at 77.5 mg/L with TDS 180 mg/L in this San Diego County California community.