North Haven Water Hardness & Quality Report (2026)
Water Hardness
5.5 grains per gallon
Source
reservoir
pH Level
7.8
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
239.9 mg/L
Est. Daily Cost
$0.25
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 North Haven, your appliances are currently losing 13% efficiency due to mineral buildup.
| Appliance | In North Haven | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.5 yrs | 8.5 yrs | -24% |
| Washing Machine | 10.1 yrs | 12 yrs | -16% |
| Water Heater | 11.8 yrs | 15 yrs | -21% |
Regional Water Comparison
How North Haven compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ North Haven, Connecticut | 94 mg/L | 11.4 ppt | 🟡 Moderately Hard | reservoir |
| Hamden, Connecticut | 42.5 mg/L | 6.9 ppt | 🟢 Soft | reservoir |
| Wallingford Center, Connecticut | 93 mg/L | 11.3 ppt | 🟡 Moderately Hard | reservoir |
| Wallingford, Connecticut | 100.5 mg/L | 12 ppt | 🟡 Moderately Hard | reservoir |
| New Haven, Connecticut | 82 mg/L | 10.4 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How North Haven compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ North Haven | 94 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes North Haven's Water Unique?
Local geology and source profile
North Haven, Connecticut, in New Haven County north of New Haven on the Quinnipiac River — a suburban community with significant industrial and healthcare presence — receives its municipal water from the South Central Connecticut Regional Water Authority (RWA), the regional water utility serving Greater New Haven. RWA draws from Lake Saltonstall and West River reservoirs in East Haven and Woodbridge respectively, supplemented by Lake Gaillard in North Branford. This reservoir network collects surface water from southern Connecticut's mixed Triassic and crystalline watershed terrain before treatment at RWA's treatment facilities.
The moderately soft 94 mg/L hardness and TDS of 239.9 mg/L reflect the southern Connecticut watershed's geological character. The RWA reservoir watersheds span both the Triassic Hartford Basin (New Haven formation red sandstone, East Berlin formation basalt flows) and remnants of Precambrian crystalline terrain — limestones and calcareous schists are present in some watershed zones but are not dominant. The Triassic basin sedimentary rocks release modest calcium from calcareous cement and scattered carbonate nodules, producing a moderately soft supply that is harder than MWRA Quabbin water but significantly softer than carbonate-heavy supplies.
At 94 mg/L, North Haven's water is moderately soft — comfortable for everyday use. Scale forms gradually in kettles and appliances over several months, soap lathers well, and the dishwasher produces clean glassware without special treatment. Semi-annual descaling of heating appliances is adequate. The notably elevated PFAS level of 11.4 ppt is a significant concern for North Haven residents — the New Haven-Meriden industrial corridor, historical Winchester Repeating Arms and other manufacturing facilities, and military-associated sites in the region contribute to elevated PFAS across the South Central Connecticut water supply watershed. A certified reverse osmosis filter is strongly recommended for all drinking and cooking water.
Geology & Source: North Haven in New Haven County is served by the South Central Connecticut Regional Water Authority (RWA) drawing from Lake Saltonstall and West River reservoirs — the watersheds drain Triassic Hartford Basin sedimentary terrain and Precambrian crystalline rocks of southern Connecticut with limited carbonate content — mixed basin geology produces moderately soft water at 94 mg/L.