The Power of Information

National Drinking Water Database


Town of Hempstead Wd - Great Neck, NY


Serves 110,000 people - Test data available: 2004-2009

This drinking water quality report shows results of tests conducted by the water utility and provided to the Environmental Working Group (EWG) by the New York Department of Health- Bureau of Public Water Supply Protection. It is part of EWG's national database that includes 47,667 drinking water utilities and 20 million test results. Water utilities nationwide detected more than 300 pollutants between 2004 and 2009. More than half of these chemicals are unregulated, legal in any amount. Despite this widespread contamination, the federal government invests few resources to protecting rivers, reservoirs, and groundwater from pollution in the first place. The information below summarizes test results for this utility and lists potential health concerns.

 
This Drinking Water System
National Average
Exceed Health GuidelinesTests showing chemicals at concentrations above health guidelines established by federal and state health agencies. These guidelines are typically set at a levels that pose no significant health risk.
17 chemicals
4
Health Standard ExceedencesChemicals detected at concentrations above the legal limit, the Maximum Contaminant Level (MCLs) established by the U.S. EPA. Most MCLs are based on annual averages, so exceeding the MCL for one test does not necessarily indicate that the system is out of compliance.
4 chemicals
0.5
Pollutants FoundThe total number of contaminants detected since 2004, according to data provided by the state water agency.
31 chemicals
8
Tests ConductedThe total number of number of water quality tests conducted by water utilities and recorded in data provided by the state water agency.
57,341 tests
420

Contaminants Exceeding Health Guidelines

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
TrichloroethyleneTrichloroethylene is used to remove grease from fabricated metal parts and in the production of some textiles; this pollutant comes from metal degreasing sites, metal finishing and rubber processing industries.2.63 ppb
15 ppb
Yes
MCLGA non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.: 0 ppb
Yes
5 ppb
TetrachloroethyleneTetrachloroethylene (perc) is a common soil and groundwater contaminant used in dry cleaning and as a solvent in automotive and metalworking factories and other industries.2.14 ppb
14.33 ppb
Yes
MCLGA non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.: 0 ppb
Yes
5 ppb
1,1-DichloroethyleneIndustrial chemical pollutant from manufacture of adhesives, synthetic fibers, refrigerants and plastic wraps.1.58 ppb
18 ppb
Yes
7 ppb
Yes
7 ppb
Carbon tetrachlorideCarbon tetrachloride is an industrial solvent and refrigerant released as a pollutant from various chemical plants and the petroleum refining industry.0.44 ppb
7 ppb
Yes
MCLGA non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.: 0 ppb
Yes
5 ppb
PerchloratePerchlorate is a synthetic oxygen additive in solid fuel propellant for rockets, missiles, and fireworks, and is primarily used by the military and the space industry; it may occur naturally in certain imported agricultural fertilizers.3.28 ppb
6.2 ppb
Yes
5 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
Lead (total)Lead is a metal that enters water by corrosion of household plumbing systems, discharge of industrial pollution and erosion of natural deposits.0.95 ppb
2.33 ppb
Yes
MCLGA non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.: 0 ppb
No
Radium-228Radium-228 is a radioactive element usually found around uranium deposits.1.05 pCi/L
1.68 pCi/L
Yes
MCLGA non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.: 0 pCi/L
No
5 pCi/L
BromodichloromethaneBromodichloromethane is a disinfection byproduct from the trihalomethane (THM) family, and is formed when chlorine, chloramines or other disinfectants react with organic and inorganic matter in water.0.02 ppb
0.85 ppb
Yes
MCLGA non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.: 0 ppb
No
80 ppb
Alpha particle activityAlpha particles are a form of radiation released from mining waste pollutants and natural sources.2.49 pCi/L
10.6 pCi/L
Yes
MCLGA non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.: 0 pCi/L
No
15 pCi/L
1,1,2-Trichloroethane1,1,2-Trichloroethane is used in production of synthetic fibers, plastic wraps and adhesives; it is released as a pollutant from various chemical manufacturing factories.0.01 ppb
1 ppb
Yes
0.3 ppb
No
5 ppb
DibromochloromethaneDibromochloromethane is a disinfection byproduct from the trihalomethane (THM) family, and is formed when chlorine, chloramines or other disinfectants react with organic and inorganic matter in water.0.02 ppb
0.8 ppb
Yes
0.4 ppb
No
80 ppb
Radium-226Radium-226 is a radioactive element usually found around uranium deposits.2.74 pCi/L
2.94 pCi/L
Yes
MCLGA non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.: 0 pCi/L
No
5 pCi/L
1,2-Dichloroethane1,2-Dichloroethane is a chemical used in the production of vinyl chloride; it is released as a pollutant from industrial chemical factories.0.02 ppb
3.14 ppb
Yes
MCLGA non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.: 0 ppb
No
5 ppb
Ethylene dibromide (EDB)Ethylene dibromide is a a pollutant from petroleum refineries that was formerly used as gasoline additive and a pesticide suspended from use by EPA in 1984.<0.01 ppb
0.04 ppb
Yes
MCLGA non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.: 0 ppb
No
0.05 ppb
1,1-Dichloroethane1,1-Dichloroethane is used in industrial chemical synthesis, as a solvent for plastics, paint, varnish, and finish removers and as an insecticide/fumigant.0.26 ppb
8 ppb
Yes
3 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
BromoformBromoform is a disinfection byproduct from the trihalomethane (THM) family, and is formed when chlorine, chloramines or other disinfectants react with organic and inorganic matter in water.<0.01 ppb
0.56 ppb
Yes
MCLGA non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.: 0 ppb
No
80 ppb
Arsenic (total)Arsenic contaminates drinking water due to mining runoff, erosion of natural deposits, emissions from glass and electronics processing and the use of arsenical compounds as wood preservatives and pesticides.0.04 ppb
0.6 ppb
Yes
MCLGA non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.: 0 ppb
No
10 ppb
NOTE: Each dot in the above graph represents one month.
* Water utilities are noted as exceeding the legal limit if any test is above the maximum contaminant level (MCL). Most MCLs are based on annual averages so exceeding the MCL for one test does not necessarily indicate that the system is out of compliance.

Other Detected Contaminants

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
1,1,1-Trichloroethane1,1,1-Trichloroethane is an industrial cleaning solvent that contaminates drinking water sources due to releases from metal degreasing sites and chemicals factories.0.75 ppb
12.75 ppb
No
200 ppb
No
200 ppb
cis-1,2-Dichloroethylenecis-1,2-Dichloroethylene is a pollutant discharged by various industrial chemical factories from the manufacture of plastic wrap, adhesives and synthetic fiber.0.6 ppb
13.5 ppb
No
70 ppb
No
70 ppb
Total trihalomethanes (TTHMs)Total trihalomethanes constitute the sum of four disinfection byproducts: chloroform, bromodichloromethane, dibromochloromethane, and bromoform.0.2 ppb
4.5 ppb
No
9.8 ppb
No
80 ppb
ChloroformChloroform is a disinfection byproduct from the trihalomethane (THM) family, and is formed when chlorine, chloramines or other disinfectants react with organic and inorganic matter in water.0.17 ppb
3.67 ppb
No
5.7 ppb
No
80 ppb
NitrateNitrate enters drinking water sources from fertilizer runoff, leaching septic tanks, and erosion of natural deposits; it is also emitted by chemical, petrochemical and metal-finishing industries.3.31 ppm
9.67 ppm
No
10 ppm
No
10 ppm
DichlorodifluoromethaneDichlorodifluoromethane (Freon 12) is a chlorofluorocarbon refrigerant and aerosol spray propellant; it was banned under the Montreal Protocol as of 2000 because of its ozone-depleting properties.0.14 ppb
3 ppb
No
1000 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
Nitrate & nitriteNitrate and nitrite enter water from fertilizer runoff, leaching from septic tanks, and erosion of natural deposits.3.38 ppm
9.67 ppm
No
10 ppm
No
10 ppm
TrichlorotrifluoroethaneTrichlorotrifluoroethane (Freon 113) is used in industrial applications such as a degreasing or dry cleaning solvent, refrigerant, fire extinguisher component and chemical intermediate; production in the U.S. has been banned since 1996.0.02 ppb
0.93 ppb
No
4000 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
CopperCopper is a naturally occuring metal and drinking water contaminant that enters tap water by corrosion of household plumbing systems and erosion of natural deposits.5.94 ppb
33.75 ppb
No
300 ppb
No
1000 ppb
Gross beta particle activity (pCi/L)Beta particles are a form of radiation frequently associated with nuclear testing and radioactive mineral deposits.1.36 pCi/L
1.41 pCi/L
NoNo
15 pCi/L
NitriteNitrite is a chemical that enters water from fertilizer runoff, leaching septic tanks, and erosion of natural deposits.0.04 ppm
0.84 ppm
No
1 ppm
No
1 ppm
Beryllium (total)Beryllium is a metal associated with metal refineries and combustion of fossil fuels, especially coal burning; it is released into the environment from electrical, aerospace and defense industries.0.01 ppb
0.2 ppb
No
1 ppb
No
4 ppb
Antimony (total)Antimony is a metal that enters water from petroleum refinery pollution, fire retardants, ceramics, electronics and solder.<0.01 ppb
0.08 ppb
No
5.6 ppb
No
6 ppb
Barium (total)Barium is a mineral that enters drinking water through drilling and mining waste runoff, discharges from chemical industries and erosion of natural deposits.0.57 ppb
9.17 ppb
No
700 ppb
No
2000 ppb
NOTE: Each dot in the above graph represents one month.
* Water utilities are noted as exceeding the legal limit if any test is above the maximum contaminant level (MCL). Most MCLs are based on annual averages so exceeding the MCL for one test does not necessarily indicate that the system is out of compliance.

Contaminants Not Detected - 107 chemicals

1,1,1,2-Tetrachloroethane, 1,1,2,2-Tetrachloroethane, 1,1-Dichloropropene, 1,2 Dibromo-3-chloropropane (DBCP), 1,2,3-Trichlorobenzene, 1,2,3-Trichloropropane, 1,2,4-Trichlorobenzene, 1,2,4-Trimethylbenzene, 1,2-Dichloropropane, 1,3,5-Trimethylbenzene, 1,3-Dichloropropane, 2,2-Dichloropropane, 2,3,7,8-TCDD (Dioxin), 2,4,5-TP (Silvex), 2,4-d, 3-Hydroxycarbofuran, Alachlor (Lasso), Aldicarb, Aldicarb sulfone, Aldicarb sulfoxide, Aldrin, Aroclor 1016, Aroclor 1221, Aroclor 1232, Aroclor 1242, Aroclor 1248, Aroclor 1254, Aroclor 1260, Atrazine, Benzene, Benzo[a]pyrene, Bromobenzene, Bromochloromethane, Bromomethane, Butachlor, Cadmium (total), Carbaryl, Carbofuran, Chlordane, Chloroethane, Chloromethane, Chromium (total), cis-1,3-Dichloropropene, Cyanide, Dalapon, Di(2-Ethylhexyl) adipate, Di(2-ethylhexyl) phthalate, Dibromoacetic acid, Dibromomethane, Dicamba, Dichloroacetic acid, Dichloromethane (methylene chloride), Dieldrin, Dinoseb, Diquat, Endothall, Endrin, Ethylbenzene, Glyphosate, Heptachlor, Heptachlor epoxide, Hexachlorobenzene (HCB), Hexachlorobutadiene, Hexachlorocyclopentadiene, Isopropylbenzene, Lindane, m-Dichlorobenzene, m-Xylene, Manganese, Mercury (total inorganic), Methomyl, Methoxychlor, Metolachlor, Metribuzin, Monobromoacetic acid, Monochloroacetic acid, Monochlorobenzene (Chlorobenzene), Mtbe, n-Butylbenzene, n-Propylbenzene, o-Chlorotoluene, o-Dichlorobenzene, o-Xylene, Oxamyl (Vydate), p-Chlorotoluene, p-Dichlorobenzene, p-Isopropyltoluene, p-Xylene, Pentachlorophenol, Picloram, Propachlor, sec-Butylbenzene, Selenium (total), Silver (total), Simazine, Styrene, tert-Butylbenzene, Thallium (total), Toluene, Total haloacetic acids (HAAs), Total polychlorinated biphenyls (PCBs), Toxaphene, trans-1,2-Dichloroethylene, trans-1,3-Dichloropropene, Trichloroacetic acid, Trichlorofluoromethane, Vinyl chloride

Pollution Summary

31Total Contaminants Detected (2004 - 2009)

Arsenic (total), Barium (total), Copper, Lead (total), Nitrate & nitrite, Nitrate, Nitrite, Antimony (total), Beryllium (total), Dichlorodifluoromethane, cis-1,2-Dichloroethylene, Trichlorotrifluoroethane, Chloroform, Bromoform, Bromodichloromethane, Dibromochloromethane, Ethylene dibromide (EDB), Total trihalomethanes (TTHMs), 1,1-Dichloroethylene, 1,1-Dichloroethane, 1,2-Dichloroethane, 1,1,1-Trichloroethane, Carbon tetrachloride, Trichloroethylene, 1,1,2-Trichloroethane, Tetrachloroethylene, Radium-226, Radium-228, Alpha particle activity, Perchlorate, Gross beta particle activity (pCi/L)

6Agricultural Pollutants
(pesticides, fertilizer, factory farms)

Arsenic (total), Nitrate & nitrite, Nitrate, Nitrite, Ethylene dibromide (EDB), Perchlorate

9Sprawl and Urban Pollutants
(road runoff, lawn pesticides, human waste)

Arsenic (total), Copper, Lead (total), Nitrate & nitrite, Nitrate, Nitrite, Antimony (total), Trichlorotrifluoroethane, Tetrachloroethylene

25Industrial Pollutants

Arsenic (total), Barium (total), Lead (total), Nitrate & nitrite, Nitrate, Nitrite, Antimony (total), Beryllium (total), Dichlorodifluoromethane, cis-1,2-Dichloroethylene, Trichlorotrifluoroethane, Ethylene dibromide (EDB), 1,1-Dichloroethylene, 1,1-Dichloroethane, 1,2-Dichloroethane, 1,1,1-Trichloroethane, Carbon tetrachloride, Trichloroethylene, 1,1,2-Trichloroethane, Tetrachloroethylene, Radium-226, Radium-228, Alpha particle activity, Perchlorate, Gross beta particle activity (pCi/L)

5Water Treatment and Distribution Byproducts
(pipes and fixtures, treatment chemicals and byproducts)

Total trihalomethanes (TTHMs), Chloroform, Bromodichloromethane, Dibromochloromethane, Bromoform

11Naturally Occurring
(naturally present but increased for lands denuded by sprawl, agriculture, or industrial development)

Nitrate, Copper, Nitrate & nitrite, Barium (total), Lead (total), Arsenic (total), Radium-228, Radium-226, Alpha particle activity, Gross beta particle activity (pCi/L), Nitrite

5Unregulated Contaminants
EPA has not established a maximum legal limit in tapwater for these contaminants

Lead (total), Dichlorodifluoromethane, Trichlorotrifluoroethane, 1,1-Dichloroethane, Perchlorate

EPA Violation Summary

No violations were reported for this system since 2004.

Information on violations is drawn directly from EPA's national violations database in the Agency's Safe Drinking Water Information System. Analyses by others have raised questions about the quality of the information in EPA's database. For the purposes of this investigation, EWG is not showing below or including in our analyses, those violations for individual water suppliers that occurred on days for which the total number of violations assigned by EPA to that water supplier was greater than 20. This criteria was based on common characteristics of incorrect violations data as identified by water utilities, from a review of EPA's violations data by several hundred utilities prior to the release of EWG's investigation.