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Long Island, NY Water Quality Report

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Sources Of Drinking Water in Long Island, New York 

Where does Long Island, New York get its water from? Residents of Nassau and Suffolk counties draw drinking water from a sole source, a system of aquifers beneath the surface of the island. The protection, maintenance and long-term sustainability of the aquifers are vital concerns of the Nassau Suffolk Water Commissioners’ Association.

The largest of Long Island’s aquifers. Consisting of sand deposits alternating with clay, it attains a maximum thickness of approximately 1,100 feet and is the source of water for most of Nassau County and about half of Suffolk County. The formation can be seen in the coastal bluffs of the north shore and plunges under the land surface to the south. The sand and gravel of the Magothy aquifer was deposited in the upper Cretaceous Period, about 50-80 million years ago.  The Magothy aquifer supplies more than 90% of the water used in Nassau County and about 50% of the water used in Suffolk County.  Is Suffolk county water safe to drink? Does Suffolk county add fluoride to the water? No, not that we detected. 

Source: Suffolk & Nassau County, New York

Contaminants Found in Long Island's Water Supply

(Detected above health guidelines)

1,2,3-Trichloropropane

1,2,3-Trichloropropane is a potent carcinogen that contaminates drinking water in agricultural regions where it was historically used as soil fumigant. 

Chloroform

Chloroform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Chloroform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy.

Chromium (hexavalent)

Chromium (hexavalent) is a carcinogen that commonly contaminates American drinking water. Chromium (hexavalent) in drinking water may be due to industrial pollution or natural occurrences in mineral deposits and groundwater.

Radiological contaminants 

Radiological contaminants leach into water from certain minerals and from mining. This utility detected Radium, combined (-226 & -228).

Total trihalomethanes (TTHMs)

Trihalomethanes are cancer-causing contaminants that form during water treatment with chlorine and other disinfectants. The total trihalomethanes group includes four chemicals: chloroform, bromodichloromethane, dibromochloromethane and bromoform. 

Potential Health Effects of Consuming These Contaminants

Health risks of 1,2,3-Trichloropropane in excess of health guideline

Unknown: The health guideline of 0.0007 ppb for 1,2,3-trichloropropane was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. 

Health risks of chloroform in excess of health guideline

Cancer: The health guideline of 1 ppb for chloroform was defined by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

Health risks of chromium (hexavalent) in excess of health guideline

Cancer: The health guideline of 0.02 ppb for chromium (hexavalent) was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

Health risks of trihalomethanes in excess of health guideline

Cancer: The health guideline of 0.8 ppb for trihalomethanes was defined by the California Office of Environmental Health Hazard Assessment as a draft public health goal, the level of drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

Health risks of radiological contaminants in excess of health guidelines

Birth defects: Drinking water contamination with radioactive substances increases the risk of cancer and may harm fetal development.

Contaminant Levels in Long Island, NY Compared to Other Regions

1,2,3-Trichloropropane

 - Health Guideline: 0.0007 ppb

 - State: 0.000117 ppb

 - Long Island, NY: 0.0126 ppb

 - National: 0.000318 ppb

Chloroform

 - Health Guideline: 1.0 ppb

 - State: 16.4 ppb

 - National: 11.4 ppb

 - Long Island, NY : 0.593 ppb

Chromium (hexavalent)

 - Health Guideline: 0.02 ppb

 - Long Island, NY: 0.414 ppb

 - State: 0.143 ppb

 - National: 0.782 ppb

Total trihalomethanes (TTHMs)

 - Health Guideline: 0.8 ppb

 - State: 26.1 ppb

 - National: 23.4 ppb

 - Long Island, NY: 5.25 ppb

Radiological contaminants  

No information available about this contaminant but it cannot be good. This utility detected Radium, combined (-226 & -228). Radiological contaminants leach into water from certain minerals and from mining. Drinking water contamination with radioactive substances increases the risk of cancer and may harm fetal development.

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April Jones

A hiker, blogger, and water quality expert...

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