Water Quality Data Table

The tables below list all of the drinking water contaminants that we detected during the calendar year of this report. The presence of contaminants in the water does not necessarily indicate that the water poses a health risk. Unless otherwise noted, the data presented in this table is from testing done in the calendar year of the report. The EPA or the State requires us to monitor for certain contaminants less than once per year because the concentrations of these contaminants do not change frequently.

 

 

 

Testing Results for Gardnerville Water Company

 

Microbiological

Result

MCL

MCLG

Typical Source

COLIFORM (TCR)

In the month of June

  1 sample returned as positive

MCL: Systems that Collect less than 40 Samples per Month – No more than 1 positive monthly sample

0

Naturally present in the environment

 

Disinfection By-Products

Monitoring
 Period

RAA

Range

Unit

MCL

MCLG

Typical Source

No Detected Results were Found in the Calendar Year of 2015

 

Lead and Copper

   Date

90th  Percentile

Range

Unit

AL

Sites
Over ALL

Typical Source

COPPER

2014-2016

0.28

0.011-0.36

ppm

1.3

0

Corrosion of household plumbing systems; Erosion of natural deposits; leaching from wood preservatives.

LEAD

2016

3.0

1.1-7.3

ppb

15

0

Corrosion of household plumbing systems; Erosion of natural deposits.

                 

 

Regulated Contaminants

    Collection
    Date

Highest
Value

Range

Unit

MCL

MCLG

Typical Source

BARIUM

12/7/2010

.22

0.098-0.22

ppm

2

2

Discharge of drilling wastes; Discharge from metal refineries; Erosion of natural deposits

FLUORIDE

4/5/2016

ND

ND

ppm

2

4

Natural Deposits; Water additive which promotes strong teeth.

NITRATE

4/5/2016

3.2

0.42-3.2

ppm

10

10

Runoff from fertilizer use; Leaching from septic tanks, sewage; Erosion of natural deposits.

ARSENIC

4/4/2016

2

1.4-2

ppb

10

0

Erosion of natural deposits;

Runoff from orchards; Runoff from glass and electronics production wastes.

               

Radionuclides

Collection
Date

Highest
Value

Range

Unit

MCL

MCLG

Typical Source

COMBINED RADIUM

(-226 & -228)

4/5/2016

1

0.7-1

pCi/L

5

0

Erosion of natural deposits

COMBINED URANIUM

4/5/2016

0.7

0.7

ug/L

30

0

Erosion of natural deposits

GROSS ALPHA INCL.

RADON & U

4/5/2016

11.8

0.7-11.8

pCi/L

15

0

Decay of natural and man-made deposits

 

Secondary Contaminants

Collection
Date

Highest
Value

Range

Unit

MCL

MCLG

Typical Source

CHLORIDE

4/5/2016

12

5.4-12

mg/L

250

COLOR

4/5/2016

0

0

CU

15

IRON

4/5/2016

0.24

0-0.24

mg/L

0.3

MAGNESIUM

4/5/2016

0.035

0-0.035

mg/L

150

Ph

4/5/2016

7.71

7.28-7.33

pH

8.5

SODIUM

4/5/2016

30

16-30

mg/L

200

20

SULFATE

4/5/2016

33

17-33

mg/L

250

TDS

4/5/2016

340

170-340

Mg/L

500

 

                 

                                                               

Violations

During the 2016 calendar year, GWC had no violations to report. 

 

Unit Description

Term

Definition

ug/L

ug/L: Number of micrograms of substance in one liter of water

ppm

ppm: Parts per million, or milligrams per liter (mg/L)

ppb

ppb: Parts per billion, or micrograms per liter (mg/L)

Positive samples/month

Positive samples/month: Number of samples taken monthly that were found to be positive

NA

NA: Not applicable

ND

ND: Not detected

NR

NR: Monitoring not required, but recommended

 

Unit Description

Term

Definition

ppm

ppm: Parts per million, or milligrams per liter (mg/L)

ppb

ppb: Parts per billion, or micrograms per liter (mg/L)

NA

NA: Not applicable

ND

ND: Not detected

NR

NR: Monitoring not required, but recommended

ug/L

ug/L: Number of micrograms of substance in one liter of water

pCi/L

pCi/L: Pico Curries per liter of air

 

Important Drinking Water Definitions

Term

Definition

MCLG

MCLG: Maximum Contaminant Level Goal: The level of a contaminant in drinking water below which there is no known or expected risk of health. MCLGs allow for a margin of safety.

MCL

MCL: Maximum Contaminant Level: The highest level of a contaminant that is allowed in drinking water. MCLs are set to the MCLGs as feasible using the best available treatment technology.

TT

TT: Treatment Technique: A required process intended to reduce the level of a contaminant in drinking water.

AL

AL: Action Level: The concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system must flow.

Variances and Exemptions

Variances and Exemptions: State or EPA permission not to meet an MCL or a treatment technique under certain conditions.

MRDLG

MRDLG: Maximum Residual Disinfection Level Goal: The level of 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.

MNR

MNR: Monitored Not Regulated

MPL

MPL: State Assigned Maximum Permissible Level