Centereach Water Hardness & Quality Report (2026)
Water Hardness
6.6 grains per gallon
Source
reservoir
pH Level
7.7
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
225.3 mg/L
Est. Daily Cost
$0.30
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 Centereach, your appliances are currently losing 15% efficiency due to mineral buildup.
| Appliance | In Centereach | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.9 yrs | 8.5 yrs | -31% |
| Washing Machine | 9.4 yrs | 12 yrs | -22% |
| Water Heater | 11.1 yrs | 15 yrs | -26% |
Regional Water Comparison
How Centereach compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Centereach, New York | 112.5 mg/L | 5.4 ppt | 🟡 Moderately Hard | reservoir |
| Lake Ronkonkoma, New York | 179 mg/L | 8.5 ppt | 🟠 Hard | reservoir |
| Holbrook, New York | 166.5 mg/L | 8 ppt | 🟠 Hard | reservoir |
| Nesconset, New York | 153.5 mg/L | 7.3 ppt | 🟠 Hard | reservoir |
| Ronkonkoma, New York | 70.5 mg/L | 3.4 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Centereach compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Centereach | 112.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Centereach's Water Unique?
Local geology and source profile
Centereach, New York, in Suffolk County — a major central Long Island suburban community (Centereach is a significant unincorporated Suffolk County community in central Long Island — part of the Brookhaven Town area, adjacent to Lake Grove and Selden in the Route 25/Middle Country Road corridor; Centereach is one of the classic post-WWII Long Island suburban communities that grew rapidly during the 1950s–1970s suburban housing boom), a diverse Suffolk County community with a primarily Italian-American, working-class, and suburban family population (central Suffolk County communities like Centereach, Selden, and Lake Grove represent the classic working-class Long Island suburban belt), home of a significant retail corridor along Route 347 and Route 25, and one of the most populated unincorporated communities in Suffolk County — draws its municipal water supply from the Long Island glacial aquifer via the Suffolk County Water Authority. Water hardness in Centereach measures 112.5 mg/L — classified as moderately hard.
Centereach's moderate hardness reflects the central Suffolk County Long Island aquifer characteristics. The Upper Glacial and Magothy aquifer at Centereach–Suffolk County draws from Pleistocene calcareous-moderate glacial outwash and Cretaceous Magothy Formation (calcareous-moderate coastal plain). SCWA produces the moderate 112.5 mg/L.
At 112.5 mg/L, Centereach residents encounter moderate scale accumulation. Monthly cleaning is recommended. SCWA consistently delivers water meeting all New York State DEC and EPA Safe Drinking Water Act requirements.
Geology & Source: Groundwater from the Upper Glacial aquifer and Magothy aquifer (Long Island glacial outwash) via the Suffolk County Water Authority (SCWA) — the Suffolk County central Long Island Centereach corridor (Pleistocene calcareous-moderate Ronkonkoma Moraine outwash and Cretaceous calcareous-moderate Magothy Formation — the calcareous-moderate central Suffolk County Long Island aquifer; limited treatment); moderately hard supply at 112.5 mg/L in Suffolk County.