GARDEN CITY PARK WATER DISTRICT

2017 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 2017

0.01 - 0.088

0.072 (1)

mg/L

1.3

AL = 1.3

Corrosion of household plumbing systems; Erosion of natural deposits

Lead

No

July / August 2017

ND - 5.6

1.7 (1)

ug/L

1.3

AL = 15

Corrosion of household plumbing systems; Erosion of natural deposits

Arsenic

No

01/06/17

ND - 1.9

ug/L

1.3

MCL = 10

Naturally occurring
Manganese

No

 01/06/17    ND - 16.0      ug/L

n/a

MCL = 300

Naturally occurring

Barium

No

01/04/17

0.014 -0.028

mg/L

n/a

MCL = 20  

Naturally occurring

Ammonia

No

01/06/17

ND - 1.6

mg/L

n/a

NONE

Naturally occurring

Sodium

No

01/06/17

18.2 - 43.8

mg/L

n/a

No MCL(2)

Naturally occurring
Iron

No

 01/06/17

ND - 180

ug/L

n/a

 MCL = 300

Naturally occurring
Selenium

No

 01/04/17    ND - 2.6      ug/L

n/a

MCL = 50

Naturally occurring

Zinc

No

01/10/17

ND - 0.083

mg/L

n/a

MCL = 5    

Naturally occurring
Nickel

No

 01/20/17

ND - 1.1   

ug/L n/a

No MCL

Naturally occurring

Magnesium

No

 01/06/17

7.7 - 22.9

ug/L

n/a

No MCL

Naturally occurring

Chloride

No

 01/06/17

37.1 - 71.1

mg/L

n/a

MCL = 250

Naturally occurring

Calcium

No

01/06/17

16.0 - 384

mg/L

n/a

No MCL

Naturally occurring

Nitrate

No

01/04/17

1.0- 7.1

mg/L

10

MCL = 10

Runoff from fertilizer and leaching from septic tanks and sewage

Sulfate

No

03/31/17

20.2 - 48.1

mg/L

n/a

MCL = 250

Naturally occurring

Thallium

No

01/06/17

ND - 0.47

ug/L

n/a

MCL = 2.0

Naturally occurring

Volatile Organic Contaminants

Tetrachloroethene

No

08/01/17

ND - 0.9

ug/L

0

MCL =  5   

Industrial/Commercial Discharge  

MTBE

No

02/07/17

ND - 1.8

ug/L

0

 MCL = 10   

Gasoline Additive

Total Trihalomethanes

No

10/17/17

ND - 5.9

ug/L

n/a

MCL = 80  

Disinfection By-Products

Radionuclides
Gross Alpha No

08/02/17

 ND - 2.31 pCi/L

0

 MCL = 15 Naturally occurring
Gross Beta No

08/02/17

 2.92 - 3.95 pCi/L

0

 MCL = 15 Naturally occurring
Radium 226 & 228 No

08/02/17

 1.04 - 2.25 pCi/L 0  MCL = 5(3) Naturally occurring

Unregulated Contaminant Monitoring Rule (4)
1.4 Dioxane No

03/10/17

 0.075 - 0.58 ug/L

n/a

 MCL = 50 Industrial Discharge
Chromium No

09/02/14

 ND - 1.0 ug/L 100  MCL = 100 Naturally deposits
Hexavalent Chromium No

05/27/14

 ND - 1.1 ug/L n/a No MCL Naturally deposits and Industrial Discharge
Strontium No

05/27/14

 77.8 - 86.7 ug/L n/a No MCL Naturally occurring
Chlorate No

04/17/14

 ND - 140 ug/L n/a  No MCL Naturally occurring

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 (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.

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).

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 2017, we collected and analyzed 30 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) - UCMR3 - Unregulated Contaminant Monitoring Rule 3 is a Federal water quality sampling program where water suppliers sample and test their source water point of entry for 1 year. Results will be used by the USEPA to determine if the contaminants need to be regulated in the future.

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