GARDEN CITY PARK WATER DISTRICT

2005 WATER QUALITY REPORT

TABLE OF DETECTED PARAMETERS

  
 
 

 

 

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, Aug. 2005

0.1(1) 

ND - 0.32

mg/l

1.3

AL=1.3

Corrosion of galvanized pipes; Erosion of natural deposits

Lead

No

June, July, Aug. 2005

1.14(1) 

ND-9.2

ug/l

0

AL=15

Corrosion of household plumbing systems; Erosion of natural deposits

Sodium

No

1/4/2005

33.7 

14.4 - 33.7

mg/l

n/a

No MCL(2)

Naturally occurring

Magnesium

No

1/4/2005

13.2 

8.7 - 13.2

mg/l

n/a

None

Naturally occurring

Chloride

No

1/4/2005

70.8 

10.0 - 70.8

mg/l

n/a

MCL=250

Naturally occurring

Calcium

No

1/4/2005

22.6 

15.3 - 22.6

mg/l

n/a

No MCL

Naturally occurring

Nitrate

No

1/4/2005

7.1 

3.5 - 7.1

mg/l

10

MCL=10

Runoff from fertilizer and leaching from septic tanks and sewage

Sulfate

No

1/26/2005

44.2 

19.0 - 44.2

mg/l

n/a

MCL=250

Naturally occurring
Perchlorate

No

1/4/2005

1.6 

ND - 1.6

ug/l

n/a

None(3)

Fertilizer

Synthetic Organic Contaminants Including Pesticides and Herbicides

None Detected

--

--

ND

--

--

--

--

Volatile Organic Contaminants

Tetrachloroethene

No

8/1/2005

0.6 

ND - 0.6

ug/l

0

MCL=5

Industrial/Commercial Discharge

MTBE

No

12/5/2005

1.2 

ND - 1.2

ug/l

0

MCL = 10

Gasoline Additive

Total Trihalomethanes

no

7/21/2005

5.3 

ND - 5.3

ug/l

n/a

MCL = 80

Disinfection By-Product

 

DEFINITIONS

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).

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

(1) - During 2005 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.