Monrovia Water Hardness & Quality Report (2026)
Water Hardness
2 grains per gallon
Source
mixed
pH Level
7.2
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
68.5 mg/L
Est. Daily Cost
$0.09
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 Monrovia, your appliances are currently losing 5% efficiency due to mineral buildup.
| Appliance | In Monrovia | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.5 yrs | 8.5 yrs | — |
| Washing Machine | 12.3 yrs | 12 yrs | — |
| Water Heater | 14.2 yrs | 15 yrs | -5% |
Regional Water Comparison
How Monrovia compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Monrovia, California | 34 mg/L | 2.9 ppt | 🟢 Soft | mixed |
| Duarte, California | 94 mg/L | 4.6 ppt | 🟡 Moderately Hard | mixed |
| Arcadia, California | 156 mg/L | 6.4 ppt | 🟠 Hard | mixed |
| Temple City, California | 129 mg/L | 5.6 ppt | 🟠 Hard | mixed |
| Baldwin Park, California | 80 mg/L | 4.2 ppt | 🟡 Moderately Hard | mixed |
National Benchmark
How Monrovia compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Monrovia | 34 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Monrovia's Water Unique?
Local geology and source profile
Monrovia, California, in Los Angeles County — a historic San Gabriel Valley city (Monrovia is one of the oldest cities in the San Gabriel Valley — founded in 1886 during the land boom following the completion of the transcontinental railroad, named after founder William Monroe), situated at the foot of the San Gabriel Mountains with direct frontage on the Monrovia Canyon Natural Area, home of Santa Anita Park (one of the premier thoroughbred horse racing venues in the United States — adjacent to neighboring Arcadia), and a diverse Los Angeles County community with a significant Taiwanese-American and Chinese-American population — draws its municipal water supply from the Raymond Basin and San Gabriel Valley Basin wells and MWD import via the City of Monrovia Public Works. Water hardness in Monrovia measures 34 mg/L — classified as very soft.
Monrovia's very soft supply reflects the San Gabriel Valley groundwater basin's calcareous-poor geology and MWD imported water characteristics. The Raymond Basin groundwater recharged from the San Gabriel Mountains drains: the Precambrian–Mesozoic calcareous-poor San Gabriel crystalline basement (Anorthosite, San Gabriel Tonalite — highly calcareous-poor); and the MWD State Water Project and Colorado River import (the calcareous-poor Sierra Nevada snowmelt via the California Aqueduct). The calcareous-poor San Gabriel Mountain geology produces the very soft 34 mg/L.
With hardness at 34 mg/L, Monrovia residents enjoy very soft water. City of Monrovia Public Works consistently delivers water meeting all California State Water Board and EPA Safe Drinking Water Act requirements.
Geology & Source: Groundwater from the Raymond Basin and San Gabriel Valley Groundwater Basin and Metropolitan Water District (MWD) Colorado River/State Water Project import via the City of Monrovia Public Works — the Los Angeles County San Gabriel Valley Arcadia–Monrovia foothill corridor (Quaternary calcareous-poor San Gabriel River alluvial fan deposits from the San Gabriel Mountains; San Gabriel Valley spreading grounds recharge); very soft supply at 34 mg/L in Los Angeles County.