Brentwood Water Hardness & Quality Report (2026)
Water Hardness
8.2 grains per gallon
Source
reservoir
pH Level
8
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
320.9 mg/L
Est. Daily Cost
$0.37
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 Brentwood, your appliances are currently losing 19% efficiency due to mineral buildup.
| Appliance | In Brentwood | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5 yrs | 8.5 yrs | -41% |
| Washing Machine | 8.4 yrs | 12 yrs | -30% |
| Water Heater | 10 yrs | 15 yrs | -33% |
Regional Water Comparison
How Brentwood compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Brentwood, New York | 140 mg/L | 6.7 ppt | 🟠 Hard | reservoir |
| North Bay Shore, New York | 174 mg/L | 8.3 ppt | 🟠 Hard | reservoir |
| Central Islip, New York | 114.5 mg/L | 5.5 ppt | 🟡 Moderately Hard | reservoir |
| Bay Shore, New York | 170.5 mg/L | 8.1 ppt | 🟠 Hard | reservoir |
| Hauppauge, New York | 132.5 mg/L | 6.4 ppt | 🟠 Hard | reservoir |
National Benchmark
How Brentwood compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Brentwood | 140 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Brentwood's Water Unique?
Local geology and source profile
Brentwood, New York, a hamlet in the Town of Islip in central Suffolk County — one of the largest and most diverse communities on Long Island, with a substantial Central American immigrant community — draws its municipal water supply from the Magothy Aquifer and Lloyd Aquifer via the Suffolk County Water Authority (SCWA), pumping from the thick Cretaceous coastal plain aquifer system beneath central Long Island. Water hardness in Brentwood measures 140 mg/L — classified as moderately hard.
Brentwood's moderate hardness reflects the central Suffolk County Long Island aquifer system. The Magothy Aquifer (Cretaceous Magothy Formation — permeable sand and gravel with calcareous cement derived from overlying glacial outwash recharge) is the primary supply aquifer for most of central Long Island. The Ronkonkoma Moraine (the terminal moraine of the Wisconsin Glacier) underlies north-central Suffolk County and contributes calcareous glacial till recharge to the aquifer at Brentwood. The moderate 140 mg/L in Brentwood reflects the Magothy Formation's moderate calcareous content from the calcareous Long Island glacial terrain recharge.
At 140 mg/L, Brentwood residents encounter moderate scale accumulation. Faucet aerators and showerheads develop deposits after several months — monthly cleaning with citric acid solution is practical maintenance. Suffolk County Water Authority consistently delivers water meeting all New York State DOH and EPA Safe Drinking Water Act requirements.
Geology & Source: Groundwater from the Magothy Aquifer and Lloyd Aquifer (Cretaceous Magothy and Lloyd Formations) via the Suffolk County Water Authority (SCWA) — the central Suffolk County Long Island Coastal Plain glaciofluvial outwash sand and gravel aquifer system; moderately hard supply at 140 mg/L in Suffolk County.