GARDEN CITY PARK WATER DISTRICT

2001 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

7/99

8/99

0.07(1)

ND-0.08

mg/l

1.3

AL=1.3

Corrosion of galvanized pipes;

Erosion of natural deposits

Lead

No

7/99

8/99

1.9(1)

ND-5.5

ug/l

0

AL=15

Corrosion of household plumbing systems; Erosion of natural deposits

Sodium

No

Numerous

42.9

13.7-42.9

mg/l

n/a

No MCL(2)

Naturally occurring

Zinc

No

Numerous

0.02

ND-0.02

mg/l

n/a

MCL=5

Naturally occurring

Chloride

No

Numerous

40.3

27.6-40.3

mg/l

n/a

MCL=250

Naturally occurring

Calcium

No

Numerous

20.3

16.1-20.3

mg/l

n/a

No MCL

Naturally occurring

Nitrate

No

Numerous

6.7

3.7-6.7

mg/l

10

MCL=10

Runoff from fertilizer and leaching from septic tanks and sewers.

Sulfate

No

Numerous

30.0

9.4-30.0

mg/l

n/a

MCL=250

Naturally occurring

Synthetic Organic Contaminants Including Pesticides and Herbicides

None Detected

--

--

ND

--

--

--

--

Volatile Organic Contaminants

Tetrachloroethene

No

Numerous

1.1

ND-1.1

ug/l

0

MCL=5

Industrial/Commercial Discharge

Trihalomethanes

No

Numerous

12.0

ND-12.0

ug/l

0

MCL=80

Disinfection by-product(3)

Unregulated Contaminants(4)

DCPA – Mono and DI-Acids

no

07/11/01 & 12/12/01

5.1

ND-5.1

ug/l

n/a

None(4)

Pesticides

 

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 1999 we collected and analyzed 33 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)- Trihalomethanes are formed as a by-product of disinfection with chlorine.

(4)- During 2001, the District participated in a special USEPA water quality sampling and testing program.  The program included the testing for several contaminants that are not yet regulated and no MCL has been established,