Glendora Water Hardness & Quality Report (2026)
Water Hardness
7.5 grains per gallon
Source
mixed
pH Level
7.9
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
349.1 mg/L
Est. Daily Cost
$0.34
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 Glendora, your appliances are currently losing 17% efficiency due to mineral buildup.
| Appliance | In Glendora | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.3 yrs | 8.5 yrs | -38% |
| Washing Machine | 8.8 yrs | 12 yrs | -27% |
| Water Heater | 10.4 yrs | 15 yrs | -31% |
Regional Water Comparison
How Glendora compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Glendora, California | 129 mg/L | 5.6 ppt | 🟠 Hard | mixed |
| Azusa, California | 52 mg/L | 3.4 ppt | 🟢 Soft | mixed |
| Covina, California | 170 mg/L | 6.8 ppt | 🟠 Hard | mixed |
| San Dimas, California | 177 mg/L | 7 ppt | 🟠 Hard | mixed |
| Vincent, California | 167.5 mg/L | 6.8 ppt | 🟠 Hard | mixed |
National Benchmark
How Glendora compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Glendora | 129 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Glendora's Water Unique?
Local geology and source profile
Glendora, California, in the east San Gabriel Valley of Los Angeles County at the base of the San Gabriel Mountains — the 'Pride of the Foothills,' a historic east San Gabriel Valley citrus community, home of Azusa Pacific University's athletic programs and the Glendora Country Club, a classic LA foothill suburb — draws its municipal water supply from the San Gabriel Valley Municipal Water District (SGVMWD) MWD import and local San Gabriel Mountains alluvial fan groundwater via the City of Glendora Water Division. Water hardness in Glendora measures 129 mg/L — classified as moderately hard.
Glendora's moderate hardness reflects the east San Gabriel Valley's blended supply at the mountain front. The Glendora alluvial fan (the San Gabriel Mountains granitic alluvial fan at the east San Gabriel Valley mountain front — Quaternary San Gabriel River and Glendora Canyon alluvial deposits) receives: local San Gabriel Mountains recharge (San Gabriel Mountains San Gabriel Anorthosite Complex and San Dimas Granodiorite — calcareous-moderate crystalline terrain with some calcareous marble lenses); and MWD Colorado River imports (moderately hard, approximately 270–310 mg/L) percolated through SGVMWD spreading grounds. The blended mountain front alluvial and MWD import supply produces the moderate 129 mg/L at Glendora.
At 129 mg/L, Glendora residents encounter moderate scale accumulation. Faucet aerators and showerheads develop deposits after several months — monthly cleaning with citric acid solution is practical maintenance. City of Glendora Water Division consistently delivers water meeting all California SWRCB and EPA Safe Drinking Water Act requirements.
Geology & Source: Mixed supply from the San Gabriel Valley Municipal Water District (SGVMWD) import and local San Gabriel Mountains alluvial fan groundwater via the City of Glendora Water Division — the east San Gabriel Valley Glendora Alluvial fan Quaternary aquifer (San Gabriel Mountains recharge + MWD Colorado River import); moderately hard supply at 129 mg/L in Los Angeles County.