Rossmoor Water Hardness & Quality Report (2026)
Water Hardness
9 grains per gallon
Source
mixed
pH Level
8.1
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
444.6 mg/L
Est. Daily Cost
$0.41
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 Rossmoor, your appliances are currently losing 21% efficiency due to mineral buildup.
| Appliance | In Rossmoor | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.5 yrs | 8.5 yrs | -47% |
| Washing Machine | 7.9 yrs | 12 yrs | -34% |
| Water Heater | 9.4 yrs | 15 yrs | -37% |
Regional Water Comparison
How Rossmoor compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Rossmoor, California | 154 mg/L | 6.4 ppt | 🟠 Hard | mixed |
| Los Alamitos, California | 153.5 mg/L | 6.3 ppt | 🟠 Hard | mixed |
| Hawaiian Gardens, California | 177.5 mg/L | 7 ppt | 🟠 Hard | mixed |
| Seal Beach, California | 152 mg/L | 6.3 ppt | 🟠 Hard | mixed |
| Cypress, California | 74 mg/L | 4 ppt | 🟡 Moderately Hard | mixed |
National Benchmark
How Rossmoor compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Rossmoor | 154 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Rossmoor's Water Unique?
Local geology and source profile
Rossmoor, California, in Orange County — an Orange County unincorporated community adjacent to Seal Beach and Los Alamitos in the northwest Orange County suburbs — receives its water from Golden State Water Company, drawing from the Metropolitan Water District (MWD) imported supply and local wells through the south California distribution.
The hard 154 mg/L hardness and TDS of 444.6 mg/L reflect the Orange County supply's hard blended character — the Miocene Puente Formation and Quaternary Orange County Basin alluvium are calcareous formations in the Los Angeles Basin; the local groundwater component draws from deeper mineral-rich basin zones that concentrate hardness and TDS relative to the softer MWD imported water (compare Seal Beach CA: 150/435 in Orange County comparable; Los Alamitos CA: 157/454 in Orange County comparable; Rossmoor consistent hard from the same Orange County MWD/well blended Miocene calcareous supply). The Orange County Basin — Miocene Puente Formation (calcareous — primary hardness contributor), Quaternary Orange County Basin alluvium (calcareous — secondary contributor), and Quaternary Los Angeles Basin playa deposit (calcareous — TDS contributor).
At 154 mg/L with TDS 445, Rossmoor's water is hard — scale builds in appliances. Quarterly descaling is appropriate. The PFAS level of 6.4 ppt warrants a certified drinking water filter. Review Golden State Water's annual water quality report.
Geology & Source: Rossmoor in Orange County draws from the Golden State Water on the Metropolitan Water District import and local wells (Orange County, south California) — the Los Angeles Basin at Orange County draws from Miocene Puente Formation (calcareous) and Quaternary Orange County Basin alluvium (calcareous) — California Orange County MWD/well blended Miocene calcareous supply produces hard water at 154 mg/L with TDS 444.6 mg/L.