New Canaan Water Hardness & Quality Report (2026)
Water Hardness
4.7 grains per gallon
Source
reservoir
pH Level
7.7
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
191 mg/L
Est. Daily Cost
$0.21
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 New Canaan, your appliances are currently losing 11% efficiency due to mineral buildup.
| Appliance | In New Canaan | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.9 yrs | 8.5 yrs | -19% |
| Washing Machine | 10.6 yrs | 12 yrs | -12% |
| Water Heater | 12.4 yrs | 15 yrs | -17% |
Regional Water Comparison
How New Canaan compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ New Canaan, Connecticut | 80.5 mg/L | 10.2 ppt | 🟡 Moderately Hard | reservoir |
| North Stamford, Connecticut | 95 mg/L | 11.5 ppt | 🟡 Moderately Hard | reservoir |
| Darien, Connecticut | 20 mg/L | 5 ppt | 🟢 Soft | reservoir |
| Wilton, Connecticut | 39 mg/L | 6.6 ppt | 🟢 Soft | reservoir |
| Norwalk, Connecticut | 98 mg/L | 11.7 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How New Canaan compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ New Canaan | 80.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes New Canaan's Water Unique?
Local geology and source profile
New Canaan, Connecticut, in Fairfield County (Western Connecticut Planning Region) — one of the most affluent communities in Connecticut and the United States, in the Fairfield County Gold Coast corridor adjacent to Darien and Wilton, a bedroom community for New York City financial professionals — receives its municipal water from Aquarion Water Company, which draws from Silvermine Reservoir and local New Canaan watershed impoundments in the Rippowam-Silvermine River watershed of southwestern Connecticut.
The moderately soft 80.5 mg/L hardness and TDS of 191 mg/L reflect New Canaan's Connecticut Highlands watershed character. New Canaan's supply area drains the New England Upland (aka Connecticut Highlands) — terrain underlain by Precambrian Grenville-age gneiss, Cambrian and Ordovician metamorphic rocks of the Reading Prong (Manhattan Prong in Westchester-Fairfield), and minor Triassic terrain fringe. The predominantly crystalline Reading Prong terrain produces soft to moderately soft runoff, but minor Ordovician limestone and marble beds add moderate calcium hardness.
At 80.5 mg/L, New Canaan's water is moderately soft — comfortable for household use. Scale forms slowly, soap lathers well, and appliances operate efficiently. Semi-annual descaling is adequate. The PFAS level of 10.2 ppt is very high for the supply hardness and warrants a certified reverse osmosis drinking water filter — the Fairfield County Gold Coast PFAS industrial corridor (Stamford corporate chemical complex), Westover Air Reserve Base downstream Connecticut, and the southwestern Connecticut-Westchester PFAS legacy contribute to New Canaan's elevated readings.
Geology & Source: New Canaan in Western Connecticut Planning Region draws from Aquarion Water Company on Silvermine Reservoir or the New Canaan local reservoirs — New Canaan's supply drains the Connecticut Highlands (Precambrian and Cambrian gneiss and granite of the Reading Prong) — Connecticut Highlands Precambrian crystalline watershed drainage produces moderately soft water at 80.5 mg/L with TDS 191 mg/L in this Fairfield County Connecticut town.