Rancho Cordova Water Hardness & Quality Report (2026)
Water Hardness
~120–179 mg/L
Hardestimated · not lab-verified
Source
reservoir
pH Level
7.8
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
329.1 mg/L
Est. Daily Cost
$0.40
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 Rancho Cordova, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Rancho Cordova | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.8 yrs | 8.5 yrs | -20% |
| Washing Machine | 9.6 yrs | 12 yrs | -20% |
| Water Heater | 12 yrs | 15 yrs | -20% |
Regional Water Comparison
How Rancho Cordova compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Rancho Cordova, California | ≈ 120–179 mg/L | 0 ppt | 🟠 Hard | reservoir |
| Carmichael, California | ≈ 180+ mg/L | 21.8 ppt | 🔴 Very Hard | mixed |
| La Riviera, California | ≈ 120–179 mg/L | 3.3 ppt | 🟠 Hard | mixed |
| Fair Oaks, California | ≈ 120–179 mg/L | 0 ppt | 🟠 Hard | reservoir |
| Rosemont, California | 101 mg/L | 6.2 ppt | 🟡 Moderately Hard | mixed |
National Benchmark
How Rancho Cordova compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Rancho Cordova | ≈ 120–179 mg/L | 🟠 Moderate |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes Rancho Cordova's Water Unique?
Local geology and source profile
Golden State Water Company (GSWC) operates the Cordova Water System serving Rancho Cordova and surrounding areas in Sacramento County, California. The utility delivers a blend of groundwater pumped from the Sacramento Valley Groundwater Basin via company-owned wells and treated surface water processed at Golden State Water's Coloma Water Treatment Plant and the Carmichael Water District's Bajamont Treatment Plant. This mixed-source approach ensures a reliable supply and compliance with all current federal and state drinking water standards throughout the service area.
The Sacramento Valley Groundwater Basin consists of Quaternary-age alluvial deposits — unconsolidated sands, silts, and gravels — deposited by ancestral rivers that underlie the region. These sediments contain naturally occurring dissolved minerals, particularly calcium and magnesium carbonates leached from surrounding rock formations. The surface water component is treated to remove turbidity and pathogens before blending with groundwater, creating a supply with moderately hard character typical of California's Central Valley.
At moderately hard levels, Rancho Cordova residents may notice mineral buildup on fixtures, reduced soap effectiveness, and scale accumulation in water heaters and dishwashers over time. Coffee makers and humidifiers are particularly susceptible to mineral deposits. Many homeowners choose to install point-of-use water softeners or use chelating agents in washing machines to extend appliance life and improve cleaning efficiency. The Cordova System meets all current EPA requirements; 2024 water quality data shows pH approximately 8.4, indicating slightly alkaline water. No specific PFAS data was disclosed, though the system undergoes comprehensive testing to ensure compliance with applicable drinking water quality guidelines.
Geology & Source: Sacramento Valley Groundwater Basin — Quaternary alluvial sands, silts, and gravels; calcium and magnesium leached from regional geology produce moderately mineralized water typical of California's Central Valley
Other California Water Reports
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Frequently Asked Questions
Is Rancho Cordova's water safe to drink?
Do I need a water softener in Rancho Cordova?
How does Rancho Cordova compare to the USA average?
Data Sources & Methodology
Water quality data for Rancho Cordova 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.