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GARDEN CITY PARK WATER DISTRICT 2020 WATER QUALITY REPORT TABLE OF DETECTED PARAMETERS |
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Definitions: Maximum
Contaminant Level (MCL) - The highest level of a
contaminant that is allowed in drinking water. MCLs are set as close to the
MCLGs as feasible. Maximum Contaminant Level Goal (MCLG) - The level of a contaminant in drinking water below which there is no known or expected risk to health. MCLGs allow for a margin of safety. Maximum Residual
Disinfection Level (MRDL) - The highest
level of a disinfectant allowed in drinking water. There is convincing
evidence that addition of a disinfectant is necessary for control of
microbial contaminants. Maximum Residual
Disinfection Level Goal (MRDLG) - The level of a
drinking water disinfectant below which there is no known or expected risk to
health. MRDLGs do not reflect the benefits of the use of disinfectants to
control microbial contaminants. Health Advisory (HA) - An estimate of acceptable drinking water levels for a chemical substance based on health effects information; a health advisory is not a legally enforceable Federal standard, but serves as technical guidance to assist Federal, State and local officials. Action Level (AL) -
The concentration of a contaminant which, if exceeded, triggers treatment or
other requirements which a water system must follow. Milligrams per
liter (mg/l) - Corresponds to one part of liquid in
one million parts of liquid (parts per million - ppm). Micrograms per
liter (ug/l) - Corresponds to one part of liquid in
one billion parts of liquid (parts per billion - ppb).
Non-Detects (ND) - Laboratory analysis indicates that the constituent is not present. pCi/L -
pico Curies perLiter is a measure of radioactivity in water. (1)- During 2020, we collected and analyzed 31 samples for lead and copper. The action levels for both lead and copper were not exceeded at any site tested. The values reported for lead and copper represent the 90th percentile. A percentile is a value on a scale of 100 that indicates the percent of a distribution that is equal to or below it. The 90th percentile is equal to or greater than 90% of the lead and copper values detected at your water system. In our sampling program, the 90th percentile value is the 4th highest result. (2)- No MCL has been established for sodium. However, 20 mg/L is a recommended guideline for people on high restricted sodium diets and 270 mg/L for those on moderate sodium diets (3)- MCL for Radium 226 and 228 is a combined total Radium = 5 pCi/L. (4)- As per Nassau County Department of Health guidelines. (5)- 1,4-Dioxane -The New York State (NYS) has established an MCL for 1,4-dioxane at 1 part per billion(ppb) effective August 26, 2020 (6)- The US environmental Protection Agency (EPA) has established a life time health advisory level (HAL) of 70 parts per trillion (ppt) for PFOA and PFOS combined. The New York State (NYS) maximum contaminant level (MCL) is 10 ppt for PFOA and 10 ppt for PFOS as of August 26, 2020 (7)- PFOA/PFOS has been used to make carpets, leathers, textiles, fabrics for furniture, paper packaging, and other materials that are resistant to water, grease, or stains. It is also used in firefighting foams. Many of these uses have been phased out by its primary U.S. manufacturer; however, there are still some ongoing uses (8) - If iron and manganese are present, the total concentration of both should not exceed 500 ug/L.
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