|
|
Contaminants
|
Violation (Yes/No)
|
Date of Sample
|
Level Detected (Maximum) (Range)
|
UNIT MEASURE-MENT
|
MCLG
|
Regulatory Limit
(MCL or AL)
|
Likely Source of Contaminant
|
|
|
|
Inorganic Contaminants
|
|
Copper
|
No
|
June / July / August 2020
|
0.064 - 0.094 0.058 (1)
|
mg/L
|
1.3
|
AL = 1.3
|
Corrosion of household plumbing systems; Erosion of natural deposits
|
|
Lead
|
No
|
June / July / August 2020
|
ND - 2.2
ND (1) |
ug/L
|
0
|
AL = 15
|
Corrosion of household plumbing systems; Erosion of natural deposits
|
|
Barium
|
No
|
12/08/21
|
0.013 - 0.028
|
mg/L
|
2.0
|
MCL = 2.0
|
Naturally occurring
|
|
Ammonia
|
No
|
01/06/21
|
ND - 4.8
|
mg/L
|
n/a
|
NONE
|
Naturally occurring
|
|
Sodium
|
No
|
01/12/21
|
ND - 44.5
|
mg/L
|
n/a
|
No MCL (2)
|
Naturally occurring
|
|
Nickel
|
No
|
05/26/21
|
ND - 0.0011 |
ug/L
|
n/a
|
No MCL
|
Naturally occurring
|
|
Magnesium
|
No
|
01/06/21
|
ND - 13.2
|
ug/L
|
n/a
|
No MCL
|
Naturally occurring
|
|
Chloride
|
No
|
12/08/21
|
ND - 61.8
|
mg/L
|
n/a
|
MCL = 250
|
Naturally occurring
|
|
Calcium
|
No
|
12/08/21
|
ND - 21.4
|
mg/L
|
n/a
|
No MCL
|
Naturally occurring
|
|
Nitrate
|
No
|
11/29/21
|
ND - 5.5
|
mg/L
|
1.0
|
MCL = 10
|
Runoff from fertilizer and leaching from septic tanks and sewage
|
|
Sulfate
|
No
|
01/06/21
|
ND - 31.8
|
mg/L
|
n/a
|
MCL = 250
|
Naturally occurring
|
|
Volatile Organic Contaminants
|
|
Methyl Tert-Butyl Ether (MTBE)
|
No
|
07/02/21
|
ND - 2.4
|
ug/L
|
n/a
|
MCL = 5.0
|
Industrial Discharge
|
|
Radionuclide
|
|
Gross Alpha
|
No
|
06/03/20
|
1.78 - 3.4
|
pCi/L
|
0
|
MCL = 15
|
Naturally occurring
|
|
Gross Beta
|
No
|
11/30/20
|
1.05 - 2.79
|
pCi/L
|
0
|
MCL = 50
|
Naturally occurring
|
|
Radium 226 & 228
|
No
|
11/30/20
|
1.35 - 2.9
|
pCi/L
|
0
|
MCL = 5 (3)
|
Naturally occurring
|
|
Uranium
|
No
|
06/03/20
|
0.89 - 1.7
|
ug/L
|
n/a
|
MCL = 30
|
Naturally occurring
|
|
Disinfectants
|
|
Chlorine Residual
|
No
|
Continuous
|
02.6 - .1.54
|
mg/L
|
n/a
|
MRDL= 4.0
|
Measure of Disinfectant
|
|
Physical Characteristics
|
|
pH
|
No
|
Continuous
|
6.4- 7.7
|
pH units
|
n/a
|
7.5 - 8.5(4)
|
Measure of acidity or alkalinity
|
|
Calcium Hardness
|
No
|
12/08/21
|
39.5 - 53.4
|
mg/L
|
n/a
|
No MCL
|
Naturally Discharge
|
|
Total Hardness
|
No
|
01/06/21
|
73.7 - 106.0
|
mg/L
|
n/a
|
No MCL
|
Naturally Discharge
|
|
Total Alkalinity
|
No
|
01/12/21
|
20.5 - 70.5
|
mg/L
|
n/a
|
No MCL
|
Naturally Discharge
|
|
Total Dissolved Solids (TDS)
|
No
|
12/08/21
|
172.0 - 234.0
|
mg/L
|
n/a
|
No MCL
|
Naturally Discharge
|
|
UCMR3
|
|
Perfluorobutanesulfonic Acid
|
No
|
10/29/21
|
ND - 2.6
|
ng/L
|
0
|
MCL= 50,000 |
Industrial discharge
|
|
Perfluoroheptanoic Acid
|
No
|
10/29/21
|
ND - 4.9
|
ng/L
|
0
|
MCL= 50,000 |
Industrial discharge
|
|
Perfluorohexanesulfonic Acid
|
No
|
10/29/21
|
ND - 3.4
|
ng/L
|
0
|
MCL= 50,000 |
Industrial discharge
|
|
Perfluorononanoic Acid (PFNA)
|
No
|
10/29/21
|
ND -2.2
|
ng/L
|
0
|
MCL= 50,000 |
Industrial discharge
|
|
Synthethic Organic Contaminants (SOCs)
|
|
1,4-Dioxane
|
No
|
05/10/21
|
ND - 0.44
|
ug/I
|
n/a
|
HA = 35(5) MCL = 1.0
|
Industrial discharge
|
|
Perfluorooctanoic Acid (PFOA)
|
No
|
03/02/21
|
ND - 4.2
|
ng/I
|
0
|
HA = 70(6) MCL = 10.0
|
Industrial discharge (7)
|
|
Perfluorooctanesulfonic Acid (PFOS)
|
No
|
10/29/21
|
ND - 13.3
|
ng/I
|
0
|
HA = 70(6) MCL = 10.0
|
Industrial discharge (7)
|
>
|
Unregulated Contaminant Monitoring Rule - Phase 4 (UCMR4) (4)
|
|
Manganese
|
No
|
01/17/19
|
0.62 -30.8
|
ug/I
|
n/a
|
MCL=300 (5)
|
Naturally occurring
|
|
HAA5
|
No
|
07/30/19
|
0.33 - 1.3
|
ug/I
|
n/a
|
MCL = 60
|
Disinfection By-Products
|
|
HAA6Br
|
No
|
07/30/19
|
0.33 - 2.06
|
ug/I
|
n/a
|
No MCL
|
Disinfection By-Products
|
| HAA9 |
No
|
07/30/19
|
0.33 - 2.06
|
ug/I
|
n/a
|
No MCL
|
Disinfection By-Products
|
Definitions="A14">:
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).
Nanograms (ng/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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