Tap WaterIndex

← New York

Tap water quality report

Islip, NY

EPA monitoring detected 12 contaminants across the 3 water suppliers serving Islip. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

3
water suppliers
1,106,500
people served
12
contaminants found
New York rankings Lead in New York PFAS in New York

What was found in Islip's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Barium
30 µg/L 1.5%
of the EPA limit 2000 µg/L
 1/3 SYR4
Pfhxa
0.0435 µg/L
No EPA limit set
 1/3 UCMR-5
Pfpea
0.0394 µg/L
No EPA limit set
 1/3 UCMR-5
6:2 Fts
0.0236 µg/L
No EPA limit set
 1/3 UCMR-5
PFOS
0.0174 µg/L
No EPA limit set
 1/3 UCMR-5
Pfba
0.0126 µg/L
No EPA limit set
 1/3 UCMR-5
PFHXS
0.0108 µg/L
No EPA limit set
 1/3 UCMR-5
Pfhpa
0.0096 µg/L
No EPA limit set
 1/3 UCMR-5
PFOA
0.0065 µg/L
No EPA limit set
 1/3 UCMR-5
PFNA
0.0057 µg/L
No EPA limit set
 1/3 UCMR-5
PFBS
0.0052 µg/L
No EPA limit set
 1/3 UCMR-5
Lead
0.0037 mg/L 25%
of the EPA limit 0.0150 mg/L
 3/3 LCR
Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Islip

SupplierPopulation served
SUFFOLK COUNTY WATER AUTHORITY 1,100,000
OCEAN BEACH WATER DISTRICT 4,500
SALTAIRE WATER DISTRICT 2,000

Frequently asked questions about Islip tap water

Is Islip tap water safe to drink?

EPA testing detected 12 contaminants in the water serving Islip. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Islip?

3 public water suppliers report drinking-water monitoring for Islip, New York to the EPA. Each is listed above with its population served.

What contaminants are in Islip's water?

The contaminants EPA monitoring detected in Islip include Barium, Pfhxa, Pfpea, 6:2 Fts, PFOS. The full list, with the highest level found and the data source, is in the table above.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.