Garden City Park Water District: Annual Water Quality Report

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 - Sept. 2008	ND - 0.09⁽¹⁾	mg/l	1.3	AL =1.3	Corrosion of galvanized pipes; Erosion of natural deposits
Lead	No	June - Sept. 2008	ND - 1.36⁽¹⁾	ug/l	0	AL =15	Corrosion of household plumbing systems; Erosion of natural deposits
Iron	No	03/10/2009	ND - 40	ug/l	N	MCL = 300	Naturally occurring
Zinc	No	01/05/2009	ND - 0.02	mg/l	n/a	MCL = 5.0	Naturally occurring
Sodium	No	11/24/2009	15.5 - 37.8	mg/l	n/a	No MCL(2)	Naturally occurring
Magnesium	No	11/24/2009	8.4 - 15.8	mg/l	n/a	None	Naturally occurring
Chloride	No	11/24/2009	36.2 - 63.2	mg/l	n/a	MCL=250	Naturally occurring
Calcium	No	11/24/2009	14.1 - 24.8	mg/l	n/a	No MCL	Naturally occurring
Nitrate	No	02/10/2009	ND - 7.0	mg/l	10	MCL=10	Runoff from fertilizer and leaching from septic tanks and sewage
Sulfate	No	02/10/2009	15.7 - 42.4	mg/l	n/a	MCL=250	Naturally occurring
Perchlorate	No	11/24/2009	ND - 1.6	ug/l	n/a	None(3)	Fertilizer
Radionuclides
Gross Alpha	No	01/24/2007	ND - 3.2	pCi/L	n/a	MCL = 15	Naturally occurring
Radium 228	No	04/05/2007	ND-2.2	pCi/L	None	No MCL	Naturally occurring
Synthetic Organic Contaminants Including Pesticides and Herbicides
None Detected	--	--	ND	--	--	--	--
Volatile Organic Contaminants
Tetrachloroethene	No	01/07/2009	ND - 2.1	ug/l	0	MCL=5	Industrial/Commercial Discharge
Trichloroethene	No	01/07/2009	ND - 0.7	ug/l	0	MCL=5	Industrial/Commercial Discharge
MTBE	No	07/01/2009	ND - 1.6	ug/l	0	MCL = 10	Gasoline Additive
Total Trihalomethanes	No	03/10/2010	ND - 2.0	ug/l	n/a	MCL = 80	Disinfections By-Product

Maximum Contaminant Level MCL)- The highest level of a contaminant that is allowed in drining 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.

Action Level (AL) – The concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system much 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).

PCI/L Pico - Curies per Liter is a measure of radioactivity in water.

Non-Detects(ND) – Laboratory analysis indicates that the constituent is not present.

(1) - During 2008 we collected and analyzed 30 samples for lead and copper. The 90% percentile level is presented in the table. The action levels for both lead and copper were not exceeded at any site tested.

(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) - Perchlorate is not regulated by the USEPA. However, New York State has set an action level of 18.0 ppb.