How does Granite Bay's water compare to the national average?

The USA national average is 151 mg/L. Granite Bay (≈ 0–59 mg/L) is 121 mg/L softer than average.

Granite Bay Water Hardness & Quality Report (2026)

Water Hardness

soft

~0–59 mg/L

Soft

estimated · not lab-verified

Source

reservoir

pH Level

7.2

neutral = 7.0

Lead

0.001 mg/L

✓ Below action level

TDS

60.4 mg/L

Est. Daily Cost

$0.08

energy & soap waste

Source: See methodology section below · Updated 2026

soft~0–59 mg/LSoft · est.

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 Granite Bay, your appliances are currently losing 4% efficiency due to mineral buildup.

Appliance	In Granite Bay	Soft Water City	Efficiency Loss
Kettle	8.2 yrs	8.5 yrs	-4%
Washing Machine	11.5 yrs	12 yrs	-4%
Water Heater	14.4 yrs	15 yrs	-4%

Regional Water Comparison

How Granite Bay compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Granite Bay, California	≈ 0–59 mg/L	0 ppt	🟢 Soft	reservoir
Rocklin, California	60 mg/L	5.2 ppt	🟡 Moderately Hard	groundwater
Folsom, California	25 mg/L	0 ppt	🟢 Soft	reservoir
Orangevale, California	≈ 180+ mg/L	0 ppt	🔴 Very Hard	reservoir
El Dorado Hills, California	≈ 120–179 mg/L	7.5 ppt	🟠 Hard	groundwater

National Benchmark

How Granite Bay compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Granite Bay	≈ 0–59 mg/L	🟢 None
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes Granite Bay's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 60.4 mg/LpH: 7.2

Granite Bay, California in Placer County is served by the San Juan Water District or the Placer County Water Agency (PCWA). The primary water source is the American River, stored in Folsom Lake, and supplemented by the State Water Project (SWP). Water is treated and distributed to residential and commercial customers throughout the Granite Bay community.

The American River watershed drains the western slope of the Sierra Nevada, underlain by Cretaceous granodiorite of the Sierra Nevada Batholith. This granitic bedrock is highly resistant to dissolution and contains minimal carbonate minerals such as limestone or dolomite. As a result, surface water draining through this granitic terrain picks up very little calcium or magnesium, producing a very soft water supply with very low total dissolved solids.

With very soft water, Granite Bay residents benefit from excellent soap lathering and minimal scale buildup in pipes, water heaters, and household appliances. Appliance lifespan is generally extended compared to hard water areas, and descaling products are rarely needed. Soft water can be slightly more corrosive to plumbing over time, so monitoring pipe condition is advisable. A water softener is not recommended or necessary. Residents should consult the most recent Consumer Confidence Report from their utility for current water quality data, contaminant levels, and treatment details.

Geology & Source: Placer County, Sierra Nevada foothills — American River (Folsom Lake) drains Cretaceous granodiorite of the Sierra Nevada Batholith; granitic watershed with low mineral content produces very soft water with very low TDS

Other California Water Reports

Rocklin

60 mg/L

🟡 Moderately Hard

Folsom

25 mg/L

🟢 Soft

Orangevale

≈ 180+ mg/L

🔴 Very Hard

El Dorado Hills

≈ 120–179 mg/L

🟠 Hard

Report an Issue

Notice an error or missing data? Help us keep this page accurate. If you spot incorrect water hardness, outdated utility info, or missing details, please let us know.

All reports are reviewed by our team. Thank you for supporting data quality!

Frequently Asked Questions

Is Granite Bay's water safe to drink?

Yes. Granite Bay's water meets all federal safety standards. The hardness is ≈ 0–59 mg/L (Soft), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Granite Bay?

Granite Bay's water is soft at ≈ 0–59 mg/L. A water softener is generally not necessary, though a carbon filter can improve taste and remove any remaining chlorine.

How does Granite Bay compare to the USA average?

The USA national average is 151 mg/L. Granite Bay (≈ 0–59 mg/L) is 121 mg/L below the national average. The softest major city is Scarsdale at just 0.02 mg/L.

Data Sources & Methodology

Water quality data for Granite Bay is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.

Estimated

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.

Estimated

Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.

Estimated

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.

Measured

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.

Modelled

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.

Calculated

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.