Rosemont Water Hardness & Quality Report (2026)
Water Hardness
5.9 grains per gallon
Source
mixed
pH Level
8
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
411.8 mg/L
Est. Daily Cost
$0.27
energy & soap waste
Source: See methodology section below · 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 Rosemont, your appliances are currently losing 13% efficiency due to mineral buildup.
| Appliance | In Rosemont | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.3 yrs | 8.5 yrs | -26% |
| Washing Machine | 9.9 yrs | 12 yrs | -17% |
| Water Heater | 11.6 yrs | 15 yrs | -23% |
Regional Water Comparison
How Rosemont compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Rosemont, California | 101 mg/L | 6.2 ppt | 🟡 Moderately Hard | mixed |
| La Riviera, California | ≈ 120–179 mg/L | 3.3 ppt | 🟠 Hard | mixed |
| Arden-Arcade, California | ≈ 120–179 mg/L | 3.7 ppt | 🟠 Hard | reservoir |
| Florin, California | 108.2 mg/L | 5.2 ppt | 🟡 Moderately Hard | mixed |
| Rancho Cordova, California | ≈ 120–179 mg/L | 0 ppt | 🟠 Hard | reservoir |
National Benchmark
How Rosemont compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Rosemont | 101 mg/L | 🟡 Low |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes Rosemont's Water Unique?
Local geology and source profile
The Suburban-Rosemont Water System, operated by American Water (CAL AM – Northern Division), serves the Suburban-Rosemont area in Sacramento County, California. The utility sources its water exclusively from deep groundwater wells, with no surface water component. Water quality and compliance inquiries are managed by the Water Quality/Environmental Compliance Manager at 916-568-4225, and the system's 2024 Annual Consumer Confidence Report documents all testing results.
The Suburban-Rosemont supply originates from Sacramento County's deep aquifer system, where groundwater flows through sedimentary formations typical of the Sacramento Valley. As water moves through soil and rock layers, it naturally dissolves calcium and magnesium minerals, imparting a moderately mineralised character to the supply. This geological setting is common throughout the Central Valley and contributes to the region's characteristic water chemistry.
At the moderately hard classification, scale buildup on fixtures and glassware is generally manageable without treatment. Appliances such as water heaters and dishwashers may experience gradual mineral accumulation over time, though the rate is slower than with harder supplies. A water softener is not essential but may be recommended for households concerned about scale or those preferring softer water for laundry and bathing. The system maintains excellent compliance across all EPA MCLGs, with no violations or contaminants exceeding health-based guidelines detected.
Geology & Source: Sacramento County deep aquifer; sedimentary formations and bedrock — calcium and magnesium dissolution produces moderate hardness typical of the Sacramento Valley
Other California Water Reports
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Frequently Asked Questions
Is Rosemont's water safe to drink?
Do I need a water softener in Rosemont?
How does Rosemont compare to the USA average?
Data Sources & Methodology
Water quality data for Rosemont is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.
Water Hardness
Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.
pH
Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.
TDS — Total Dissolved Solids
Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.
PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances
EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.
Lead
Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.
Appliance Lifespan
Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.