San Gabriel Water Hardness & Quality Report (2026)
Water Hardness
10.8 grains per gallon
Source
mixed
pH Level
8.3
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
578.8 mg/L
Est. Daily Cost
$0.49
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 San Gabriel, your appliances are currently losing 25% efficiency due to mineral buildup.
| Appliance | In San Gabriel | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 3.5 yrs | 8.5 yrs | -59% |
| Washing Machine | 6.7 yrs | 12 yrs | -44% |
| Water Heater | 8.2 yrs | 15 yrs | -45% |
Regional Water Comparison
How San Gabriel compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ San Gabriel, California | 185.5 mg/L | 7.3 ppt | 🔴 Very Hard | mixed |
| East San Gabriel, California | 152.5 mg/L | 6.3 ppt | 🟠 Hard | mixed |
| Alhambra, California | 65.5 mg/L | 3.8 ppt | 🟡 Moderately Hard | mixed |
| San Marino, California | 44.5 mg/L | 3.2 ppt | 🟢 Soft | mixed |
| Rosemead, California | 148.5 mg/L | 6.2 ppt | 🟠 Hard | mixed |
National Benchmark
How San Gabriel compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ San Gabriel | 185.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
Bring Badger-quality water to your San Gabriel home
Shop water softeners on Amazon.com →
What Makes San Gabriel's Water Unique?
Local geology and source profile
San Gabriel, California, in Los Angeles County in the central San Gabriel Valley — home of the San Gabriel Mission (Mission San Gabriel Arcángel, founded 1771 — the fourth of the 21 California Missions, one of the most significant Spanish colonial sites in California), an ethnically diverse community with a significant Chinese-American and Vietnamese-American population, gateway to the San Gabriel Valley's 'Little Taipei' and Asian-American food culture corridor, and a historic Los Angeles County city at the foot of the San Gabriel Mountains — draws its municipal water supply from the Main San Gabriel Basin and MWD import via the City of San Gabriel Water Division. Water hardness in San Gabriel measures 185.5 mg/L — classified as hard.
San Gabriel's hard supply reflects the central San Gabriel Valley's calcareous geology and Colorado River import contribution. The Main San Gabriel Basin at San Gabriel draws from: Quaternary alluvial fan deposits eroded from the San Gabriel Mountains (Cretaceous San Gabriel Mountains Batholith granodiorite — moderately calcareous crystalline terrain); the MWD Colorado River import blended at the Main San Gabriel Basin spreading grounds (the Colorado River is highly calcareous at approximately 280–310 mg/L). San Gabriel's blend of local basin groundwater and MWD Colorado River import produces the hard 185.5 mg/L.
At 185.5 mg/L, San Gabriel residents face regular hard water challenges. Monthly descaling with citric acid solution is standard maintenance. City of San Gabriel Water Division consistently delivers water meeting all California SWRCB and EPA Safe Drinking Water Act requirements.
Geology & Source: Groundwater from the Main San Gabriel Basin (San Gabriel Valley Groundwater Basin) and Metropolitan Water District (MWD) Colorado River import via the City of San Gabriel Water Division — the Los Angeles County central San Gabriel Valley (Quaternary alluvial fan deposits from San Gabriel Mountains granodiorite and MWD Colorado River import); hard supply at 185.5 mg/L in Los Angeles County.