The Power of Information

National Drinking Water Database


WA of Western Nassau Utilities - Great Neck, NY


Serves 120,000 people

Tetrachloroethylene

Tetrachloroethylene (perc) is a common soil and groundwater contaminant used in dry cleaning and as a solvent in automotive and metalworking factories and other industries.
 
This Drinking Water System
Test Days Exceeding Health GuidelinesDefinition of what this is
185 days
Test Days Exceeding Legal LimitsNumber of days in which the samples taken in that day exceed the Maximum Contaminant Level (Depending on the contaminant and its MCL, that may or may not trigger an MCL violation. Some MCLs are based on averages spanning several months to a year)
60 days
Test DaysNumber of days in which this chemical has reported results in the data we received from the State
222 days
Tests ConductedNumber of individual tests done for this contaminant
836 tests

Testing Summary

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
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.3.44 ppb
14.81 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
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.

Health Based and Legal Limits for Tetrachloroethylene

Health Based Limits for Tetrachloroethylene

StandardDescriptionLevel
Maximum Contaminant Limit Goal (MCLG)A 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
California Public Health GoalsDefined by the State of California Office of Environmental Health Hazard Assessment (OEHHA) as the level of contaminant that is allowed in drinking water. For acutely toxic substances, levels are set at which scientific evidence indicates that no known or anticipated adverse effects on health will occur, plus an adequate margin-of safety. PHGs for carcinogens or other substances which can cause chronic disease shall be based solely on health effects without regard to cost impacts and shall be set at levels which OEHHA has determined do not pose any significant risk to health.0.06 ppb
EPA Human Health Water Quality CriteriaWater quality criteria set by the US EPA provide guidance for states and tribes authorized to establish water quality standards under the Clean Water Act (CWA) to protect human health. These are non-enforceable standards based upon exposure by both drinking water and the contribution of water contamination to other consumed foods. Source: U.S. Environmental Protection Agency.0.69 ppb
Maximum Contaminant Limit (MCL)The enforceable standard which defines the highest level of a contaminant that is allowed in drinking water. MCLs are set as close to health-based limits (Maximum Contaminant Level Goals, or MCLGs) as feasible using the best available analytical and treatment technologies and taking cost into consideration. Source: U.S. Environmental Protection Agency.5 ppb
Lifetime health-based limit, non-cancer riskConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for a lifetime of exposure. The Lifetime health-based limit (or Health Advisory, HA) is based on exposure for a a 70-kg adult consuming 2 liters of water per day. Source: U.S. Environmental Protection Agency.10 ppb
Drinking Water Equivalent LevelA lifetime exposure concentration protective of adverse, noncarcinogenic health effects, that assumes all of the exposure to a contaminant is from drinking water. Source: U.S. Environmental Protection Agency.500 ppb
Children's health-based limit for 1-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for up to one day of exposure. The One-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.2000 ppb
Children's health-based limit for 10-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic effects for up to ten days of exposure. The Ten-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.2000 ppb

Testing Results

Testing DateAverage
Result
Samples taken that dayNumber of Non-DetectsRange of Results
2009-02-013.8 ppb210 to 7.6 ppb
2009-02-010 ppb110 ppb
2009-02-011 ppb101 ppb
2009-02-018.85 ppb201 to 16.7 ppb
2009-02-013.2 ppb210 to 6.4 ppb
2009-01-010.8 ppb100.8 ppb
2009-01-016.7 ppb200.8 to 12.6 ppb
2009-01-010 ppb220 ppb
2009-01-016 ppb106 ppb
2009-01-010 ppb110 ppb
2009-01-017.7 ppb107.7 ppb
2008-12-010.2 ppb430 to 0.8 ppb
2008-12-018.85 ppb204.3 to 13.4 ppb
2008-12-017.78 ppb420 to 30.3 ppb
2008-12-013.6 ppb430 to 14.4 ppb
2008-12-014.3 ppb210 to 8.6 ppb
2008-12-015.83 ppb310 to 13 ppb
2008-12-012.95 ppb210 to 5.9 ppb
2008-11-019.85 ppb430 to 39.4 ppb
2008-11-012.1 ppb420 to 7.3 ppb
2008-11-014.52 ppb520 to 15.9 ppb
2008-11-017.2 ppb210 to 14.4 ppb
2008-11-016.03 ppb410 to 11.9 ppb
2008-10-016.8 ppb203.4 to 10.2 ppb
2008-10-013.25 ppb420 to 12.2 ppb
2008-10-016.85 ppb430 to 27.4 ppb
2008-10-011.73 ppb430 to 6.9 ppb
2008-10-013.98 ppb530 to 15 ppb
2008-10-010.3 ppb430 to 1.2 ppb
2008-10-010 ppb220 ppb
2008-10-0110.25 ppb205.1 to 15.4 ppb
2008-10-017 ppb203.8 to 10.2 ppb
2008-09-013.18 ppb620 to 10.2 ppb
2008-09-0112.7 ppb210 to 25.4 ppb
2008-09-012.98 ppb430 to 11.9 ppb
2008-09-010.27 ppb320 to 0.8 ppb
2008-09-016.65 ppb203.1 to 10.2 ppb
2008-09-012.75 ppb210 to 5.5 ppb
2008-08-013.68 ppb620 to 12 ppb
2008-08-0114.5 ppb210 to 29 ppb
2008-08-011.9 ppb310 to 3.1 ppb
2008-08-014.36 ppb520 to 14.4 ppb
2008-08-013.75 ppb410 to 11.1 ppb
2008-08-011.25 ppb210 to 2.5 ppb
2008-08-011.8 ppb210 to 3.6 ppb
2008-08-010 ppb220 ppb
2008-07-010 ppb110 ppb
2008-07-016.25 ppb403.5 to 13.5 ppb
2008-07-011.5 ppb530 to 6.5 ppb
2008-07-011.7 ppb101.7 ppb
2008-07-014.05 ppb430 to 16.2 ppb
2008-07-014.15 ppb203.9 to 4.4 ppb
2008-07-010 ppb220 ppb
2008-07-018.15 ppb430 to 32.6 ppb
2008-07-011.7 ppb210 to 3.4 ppb
2008-07-014 ppb204 ppb
2008-07-012.5 ppb510 to 3.8 ppb
2008-07-013.84 ppb530 to 15.1 ppb
2008-06-013 ppb103 ppb
2008-06-019.05 ppb204.3 to 13.8 ppb
2008-06-0114.03 ppb310 to 38.9 ppb
2008-06-013.36 ppb530 to 12.8 ppb
2008-06-010.3 ppb320 to 0.9 ppb
2008-06-010 ppb220 ppb
2008-06-012.89 ppb730 to 9.7 ppb
2008-06-012.8 ppb410 to 4.2 ppb
2008-05-017 ppb530 to 34.1 ppb
2008-05-012.7 ppb202.6 to 2.8 ppb
2008-05-016.08 ppb620 to 14.9 ppb
2008-05-011.7 ppb410 to 2.8 ppb
2008-05-011.75 ppb210 to 3.5 ppb
2008-05-012.95 ppb202.9 to 3 ppb
2008-05-012.82 ppb640 to 13.1 ppb
2008-05-011.93 ppb310 to 3.1 ppb
2008-04-010.2 ppb320 to 0.6 ppb
2008-04-0117.2 ppb+510 to 58.7 ppb
2008-04-011.55 ppb201.5 to 1.6 ppb
2008-04-013.55 ppb420 to 10 ppb
2008-04-010.52 ppb640 to 1.6 ppb
2008-04-012.2 ppb202.1 to 2.3 ppb
2008-04-013.37 ppb620 to 11.4 ppb
2008-03-016.82 ppb940 to 36.3 ppb
2008-03-014.75 ppb410 to 15.3 ppb
2008-03-012.15 ppb202.1 to 2.2 ppb
2008-03-011.9 ppb201.9 ppb
2008-03-015.17 ppb310 to 11.7 ppb
2008-03-010.8 ppb630 to 2 ppb
2008-03-017.45 ppb203.9 to 11 ppb
2008-02-013.4 ppb420 to 10.1 ppb
2008-02-011.42 ppb520 to 2.4 ppb
2008-02-013.5 ppb430 to 14 ppb
2008-02-016.04 ppb740 to 35 ppb
2008-02-012.15 ppb202.1 to 2.2 ppb
2008-02-013.53 ppb610 to 12.1 ppb
2008-02-012.75 ppb202.4 to 3.1 ppb
2008-01-010.16 ppb540 to 0.8 ppb
2008-01-019.2 ppb410 to 31.9 ppb
2008-01-014.98 ppb420 to 14.3 ppb
2008-01-010 ppb440 ppb
2008-01-013.98 ppb510 to 10.6 ppb
2008-01-010.87 ppb630 to 2.2 ppb
2008-01-017.1 ppb203.4 to 10.8 ppb
2008-01-010 ppb220 ppb
2008-01-010 ppb220 ppb
2007-12-019.08 ppb520 to 31.6 ppb
2007-12-011.5 ppb310 to 2.3 ppb
2007-12-010 ppb110 ppb
2007-12-010 ppb110 ppb
2007-12-010 ppb110 ppb
2007-12-012.15 ppb202.1 to 2.2 ppb
2007-12-012.88 ppb540 to 14.4 ppb
2007-12-011.4 ppb530 to 6.2 ppb
2007-11-010 ppb110 ppb
2007-11-014.25 ppb1150 to 30.7 ppb
2007-11-010 ppb440 ppb
2007-11-012.48 ppb530 to 11.5 ppb
2007-11-011.28 ppb430 to 5.1 ppb
2007-11-011.3 ppb410 to 2.2 ppb
2007-11-010 ppb330 ppb
2007-11-014.98 ppb402.1 to 11.5 ppb
2007-11-010.7 ppb430 to 2.8 ppb
2007-11-012.4 ppb102.4 ppb
2007-10-014.37 ppb320 to 13.1 ppb
2007-10-011.55 ppb430 to 6.2 ppb
2007-10-0112.78 ppb410 to 45.5 ppb
2007-10-010.34 ppb530 to 1.1 ppb
2007-10-010.9 ppb200.7 to 1.1 ppb
2007-10-010 ppb220 ppb
2007-10-010 ppb220 ppb
2007-10-010.4 ppb210 to 0.8 ppb
2007-09-018 ppb210 to 16 ppb
2007-09-0112.4 ppb410 to 44.5 ppb
2007-09-010 ppb110 ppb
2007-09-013.8 ppb210 to 7.6 ppb
2007-09-010.35 ppb210 to 0.7 ppb
2007-09-012.2 ppb202.1 to 2.3 ppb
2007-09-010.98 ppb530 to 2.5 ppb
2007-09-010.37 ppb320 to 1.1 ppb
2007-08-013.7 ppb720 to 14.6 ppb
2007-08-011.85 ppb201.8 to 1.9 ppb
2007-08-0117.6 ppb+210 to 35.2 ppb
2007-08-011.3 ppb410 to 2.4 ppb
2007-08-010 ppb440 ppb
2007-08-011.9 ppb201.8 to 2 ppb
2007-08-010.4 ppb320 to 1.2 ppb
2007-08-011.95 ppb201.9 to 2 ppb
2007-07-0111.9 ppb630 to 48.3 ppb
2007-07-010 ppb880 ppb
2007-07-011.36 ppb520 to 3 ppb
2007-07-010.5 ppb320 to 1.5 ppb
2007-07-010 ppb220 ppb
2007-06-010 ppb220 ppb
2007-06-010.47 ppb320 to 1.4 ppb
2007-06-013.6 ppb740 to 16.7 ppb
2007-06-0112.5 ppb410 to 46.9 ppb
2007-05-010 ppb220 ppb
2007-05-0111.08 ppb1050 to 55.9 ppb
2007-05-010 ppb110 ppb
2007-05-011.5 ppb101.5 ppb
2007-05-010.43 ppb320 to 1.3 ppb
2007-04-0130.37 ppb+310 to 66.7 ppb
2007-04-012.21 ppb950 to 12.4 ppb
2007-04-010 ppb660 ppb
2007-04-010 ppb220 ppb
2007-04-010 ppb110 ppb
2007-04-010 ppb220 ppb
2007-03-010.86 ppb520 to 1.5 ppb
2007-03-018.73 ppb950 to 54.4 ppb
2007-03-016 ppb106 ppb
2007-03-010 ppb220 ppb
2007-02-011.4 ppb101.4 ppb
2007-02-014.05 ppb402.6 to 6.1 ppb
2007-02-018.19 ppb950 to 48.5 ppb
2007-01-010 ppb220 ppb
2007-01-014.78 ppb1170 to 35.1 ppb
2007-01-010.7 ppb420 to 1.5 ppb
2007-01-013.8 ppb203.8 ppb
2007-01-016.1 ppb106.1 ppb
2006-12-013.98 ppb610 to 13.5 ppb
2006-12-0114.81 ppb840 to 68.7 ppb
2006-11-015.12 ppb1180 to 36.8 ppb
2006-11-011.98 ppb401.4 to 2.6 ppb
2006-11-010.8 ppb750 to 4.5 ppb
2006-11-0130.7 ppb+210 to 61.4 ppb
2006-10-010 ppb220 ppb
2006-10-012.46 ppb1050 to 13.5 ppb
2006-10-0112.2 ppb840 to 51.9 ppb
2006-09-0111.74 ppb960 to 56.6 ppb
2006-09-012.25 ppb401.8 to 2.7 ppb
2006-09-010.3 ppb320 to 0.9 ppb
2006-08-010 ppb220 ppb
2006-08-014.6 ppb204.5 to 4.7 ppb
2006-08-010 ppb220 ppb
2006-08-016.2 ppb510 to 17 ppb
2006-08-019.16 ppb1050 to 44 ppb
2006-07-016.95 ppb206.9 to 7 ppb
2006-07-012.6 ppb202.6 ppb
2006-07-010.47 ppb1390 to 2.1 ppb
2006-07-015.05 ppb420 to 14 ppb
2006-07-0112 ppb750 to 43 ppb
2006-06-0118.5 ppb+210 to 37 ppb
2006-06-010.65 ppb210 to 1.3 ppb
2006-06-012.94 ppb710 to 5.6 ppb
2006-06-010.15 ppb860 to 0.61 ppb
2006-06-017.57 ppb630 to 30 ppb
2006-05-018.12 ppb530 to 35 ppb
2006-05-012.35 ppb810 to 4.5 ppb
2006-05-014.33 ppb320 to 13 ppb
2006-04-010 ppb220 ppb
2006-04-015.76 ppb1030 to 47 ppb
2006-04-018.86 ppb950 to 48 ppb
2006-03-011.83 ppb300.8 to 3.3 ppb
2006-03-010.2 ppb320 to 0.6 ppb
2006-03-010 ppb110 ppb
2006-03-011.7 ppb101.7 ppb
2006-03-016.18 ppb630 to 26 ppb
2006-02-011.75 ppb210 to 3.5 ppb
2006-02-018.78 ppb420 to 26 ppb
2006-02-010.93 ppb630 to 3.2 ppb
2006-01-014.29 ppb860 to 25 ppb
2006-01-011.5 ppb320 to 4.5 ppb
2006-01-011.5 ppb400.6 to 3 ppb