Novato Water Hardness & Quality Report (2026)
Water Hardness
6.5 grains per gallon
Source
mixed
pH Level
7.8
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
288.8 mg/L
Est. Daily Cost
$0.29
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 Novato, your appliances are currently losing 15% efficiency due to mineral buildup.
| Appliance | In Novato | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6 yrs | 8.5 yrs | -29% |
| Washing Machine | 9.5 yrs | 12 yrs | -21% |
| Water Heater | 11.2 yrs | 15 yrs | -25% |
Regional Water Comparison
How Novato compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Novato, California | 110.5 mg/L | 5.3 ppt | 🟡 Moderately Hard | mixed |
| San Anselmo, California | 153.5 mg/L | 6.5 ppt | 🟠 Hard | mixed |
| San Rafael, California | 49.5 mg/L | 3.5 ppt | 🟢 Soft | mixed |
| Petaluma, California | 48.5 mg/L | 3.4 ppt | 🟢 Soft | mixed |
| Larkspur, California | 109 mg/L | 5.2 ppt | 🟡 Moderately Hard | mixed |
National Benchmark
How Novato compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Novato | 110.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Novato's Water Unique?
Local geology and source profile
Novato, California, in northern Marin County — the largest city in Marin County, a major north Marin commuter suburb with a significant Hamilton Air Force Base reuse (Hamilton Landing) and a diverse military and tech community — draws its municipal water supply from Stafford Lake (Novato Creek watershed) and imported water from the Sonoma County Aqueduct via the North Marin Water District. Water hardness in Novato measures 110.5 mg/L — classified as moderately hard.
Novato's moderate hardness reflects the blended local Marin County watershed and imported Sonoma County supply. The Novato Creek–Stafford Lake watershed drains the Marin County Coast Range (Franciscan Complex — Jurassic–Cretaceous graywacke, chert, greenstone, and serpentinite that characterize the California Coast Range, a calcium-moderate terrain). The imported Sonoma County Aqueduct supply (from Lake Mendocino and Lake Sonoma on the Russian River) contributes water draining the Sonoma Coast Range (Franciscan Complex and Great Valley Sequence calcareous formations). The blended Marin local and Russian River Sonoma supply, both draining moderate-calcareous Coast Range terrain, produces the moderate 110.5 mg/L at Novato.
At 110.5 mg/L, Novato residents encounter moderate scale accumulation. Faucet aerators and showerheads develop deposits after several months — monthly cleaning with citric acid solution is practical maintenance. North Marin Water District consistently delivers water meeting all California SWRCB and EPA Safe Drinking Water Act requirements.
Geology & Source: Surface water from the Stafford Lake Reservoir (Novato Creek watershed) and the North Marin Water District Sonoma County aqueduct via the North Marin Water District — the Marin County Coast Range (Franciscan Complex graywacke, serpentinite, and chert) watershed; moderately hard supply at 110.5 mg/L in Marin County.