Middle Island Water Hardness & Quality Report (2026)
Water Hardness
4.7 grains per gallon
Source
reservoir
pH Level
7.5
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
133.1 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 Middle Island, your appliances are currently losing 11% efficiency due to mineral buildup.
| Appliance | In Middle Island | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7 yrs | 8.5 yrs | -18% |
| Washing Machine | 10.6 yrs | 12 yrs | -12% |
| Water Heater | 12.4 yrs | 15 yrs | -17% |
Regional Water Comparison
How Middle Island compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Middle Island, New York | 80 mg/L | 3.9 ppt | 🟡 Moderately Hard | reservoir |
| Ridge, New York | 164.5 mg/L | 7.8 ppt | 🟠 Hard | reservoir |
| Coram, New York | 71.5 mg/L | 3.5 ppt | 🟡 Moderately Hard | reservoir |
| Rocky Point, New York | 67 mg/L | 3.3 ppt | 🟡 Moderately Hard | reservoir |
| Medford, New York | 68 mg/L | 3.3 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Middle Island compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Middle Island | 80 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Middle Island's Water Unique?
Local geology and source profile
Middle Island, New York, in Suffolk County — a Suffolk County hamlet adjacent to Coram and Ridge in central Long Island — receives its water from the Suffolk County Water Authority (SCWA), drawing from the Upper Glacial Aquifer through the central Long Island distribution.
The moderately hard 80 mg/L hardness and TDS of 133.1 mg/L reflect the Suffolk County supply's moderate glacial aquifer character — the Pleistocene Upper Glacial Aquifer and Miocene Raritan Formation are insoluble-slightly calcareous sandy formations in the Long Island aquifer system; the Middle Island zone draws from relatively clean glacial sand aquifer with moderate mineral content from Long Island's sandy glacial geology (compare Coram NY: 77/126 in Suffolk County comparable; Ridge NY: 82/139 in Suffolk County comparable; Middle Island consistent moderate from the same Suffolk County Upper Glacial Aquifer Pleistocene insoluble supply). The Upper Glacial Aquifer at Suffolk County — Pleistocene Upper Glacial Aquifer (insoluble sandy — primary dilutant), Miocene Raritan Formation (slightly calcareous — primary hardness contributor), and Quaternary Long Island glacial till (slightly calcareous — minor TDS).
At 80 mg/L with TDS 133, Middle Island's water is moderately hard — mild scale buildup. Semi-annual descaling is appropriate. The PFAS level of 3.9 ppt is moderate — a certified drinking water filter provides added protection. Review the Suffolk County Water Authority's annual water quality report.
Geology & Source: Middle Island in Suffolk County draws from the Suffolk County Water Authority on the Upper Glacial Aquifer (Suffolk County, Long Island New York) — the Long Island aquifer at Suffolk County draws from Pleistocene Upper Glacial Aquifer (insoluble sandy) and Miocene Raritan Formation (slightly calcareous) — New York Suffolk County Upper Glacial Aquifer Pleistocene insoluble supply produces moderately hard water at 80 mg/L with TDS 133.1 mg/L.