GARDEN CITY PARK WATER DISTRICT

2011 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

July - August 2011

ND - 0.08(1)

mg/l

1.3

AL = 1.3

Corrosion of household plumbing; Erosion of natural deposits

Lead

No

July - August 2011

ND - 3.27(1)

ug/l

0

AL = 15

Corrosion of household plumbing; Erosion of natural deposits

Iron

No

01/10/11

ND - 50

ug/l

n/a

MCL = 300

Naturally occurring

Sodium

No

01/05/11

21.7 -50.7

mg/l

n/a

No MCL(2)

Naturally occurring

Magnesium

No

01/05/11

7.7 - 16.3

mg/l

n/a

None

Naturally occurring

Chloride

No

01/05/11

35.8 - 65.7

mg/l

n/a

MCL = 250

Naturally occurring

Calcium

No

01/05/11

15.6 - 26.1

mg/l

n/a

No MCL

Naturally occurring

Nitrate

No

01/13/11

2.9 - 7.2

mg/l

10

MCL = 10

Runoff from fertilizer and leaching from septic tanks and sewage

Sulfate

No

01/13/11

21.3 - 39.0

mg/l

n/a

MCL =250

Naturally occurring

Synthetic Organic Contaminants Including Pesticides and Herbicides

None Detected

--

--

ND

--

--

--

--

Radiological
Gross Alpha No

12/22/10

0.7 - 2.1 pci/L

-

 MCL = 15 Naturally occurring
Radium 228 No

12/22/10

1.2 - 1.8 pci/L - No MCL Naturally occurring

Volatile Organic Contaminants

Tetrachloroethene

No

09/07/11

ND - 1.1

ug/l

0

MCL =  5

Industrial/Commercial Discharge

MTBE

No

08/01/11

ND - 1.2

ug/l

0

MCL = 10

Gasoline Additive

Total Trihalomethanes

No

03/18/11

ND - 2.9

ug/l

n/a

MCL = 80

Disinfections By-Product

 

 

 

 

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.

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 2011 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.