Rowland Heights Water Hardness & Quality Report (2026)
Water Hardness
9.6 grains per gallon
Source
mixed
pH Level
8.1
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
489.7 mg/L
Est. Daily Cost
$0.44
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 Rowland Heights, your appliances are currently losing 22% efficiency due to mineral buildup.
| Appliance | In Rowland Heights | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.2 yrs | 8.5 yrs | -51% |
| Washing Machine | 7.5 yrs | 12 yrs | -38% |
| Water Heater | 9 yrs | 15 yrs | -40% |
Regional Water Comparison
How Rowland Heights compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Rowland Heights, California | 165 mg/L | 6.7 ppt | 🟠 Hard | mixed |
| South San Jose Hills, California | 58.5 mg/L | 3.6 ppt | 🟢 Soft | mixed |
| Walnut, California | 151.5 mg/L | 6.3 ppt | 🟠 Hard | mixed |
| Brea, California | 51.5 mg/L | 3.4 ppt | 🟢 Soft | mixed |
| La Habra, California | 38.5 mg/L | 3 ppt | 🟢 Soft | mixed |
National Benchmark
How Rowland Heights compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Rowland Heights | 165 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
Bring Badger-quality water to your Rowland Heights home
Shop water softeners on Amazon.com →
What Makes Rowland Heights's Water Unique?
Local geology and source profile
Rowland Heights, California, an unincorporated community in the east San Gabriel Valley of Los Angeles County — one of the largest Chinese-American communities in the United States, known as the 'Chinese Beverly Hills,' a major Taiwanese-American, Chinese-American, and Vietnamese-American community center with Nogales Street's famous Chinese commercial corridor — draws its municipal water supply from Metropolitan Water District (MWD) imports and local basin supplies via the Walnut Valley Water District (WVWD). Water hardness in Rowland Heights measures 165 mg/L — classified as hard.
Rowland Heights' hard supply reflects the east San Gabriel Valley Pomona Valley distribution characteristics. The Walnut Valley Water District serves the eastern San Gabriel Valley corridor (Rowland Heights, Walnut, Diamond Bar) primarily with MWD import blended with local Puente Hills alluvial basin groundwater. The Puente Hills alluvial basin at Rowland Heights is recharged by the San Jose Creek and the San Gabriel Mountains alluvial fan — moderate calcareous contributions from the east San Gabriel Mountains granitic and calcareous foothill terrain. The WVWD distribution infrastructure in the Rowland Heights zone, combined with the blended supply, produces the hard 165 mg/L at household taps.
At 165 mg/L, Rowland Heights residents face regular hard water challenges. Scale deposits form on faucet aerators, showerheads, and appliances within weeks — monthly descaling with citric acid solution is standard maintenance. Walnut Valley Water District consistently delivers water meeting all California SWRCB and EPA Safe Drinking Water Act requirements.
Geology & Source: Mixed supply from the Walnut Valley Water District (WVWD) MWD import and the San Jose Creek alluvial fan via the Walnut Valley Water District — the Los Angeles County San Gabriel Valley east Pomona Valley (MWD Colorado River and Bay-Delta import + east San Gabriel alluvial aquifer); hard supply at 165 mg/L — reflecting the WVWD distribution characteristics in the Rowland Heights Pomona Valley zone.