WATER MONITORING RESULTS
Microbiological Contaminants

Contaminant

Violation

Y/N

Highest No. of dections

No. of months in violation

Unit

Measurement

MCL in CCR units

PHG

MCLG

Likely Source of Contamination

 

Total Coliform Bacteria

 

N

 

0

 

0

 

0

 For systems that collect less than 40 samples per month, no more than 1 positive sample

 

0

 

0

 

Naturally present in the environment

Fecal coliform and E.coli

N

0

0

0

a routine sample and repeat sample are total coliform positive, and one is also fecal coliform or E. coli positive

0

0

Human and animal fecal waste

 Turbidity

N

0.2

0.1/0.4

TT

5

N/A

N/A

Soil runoff'

 

RADIOACTIVE CONTAMINANTS

Contaminant

Violation

Y/N

Level

Detected

Range

Unit

Measurement

MCL in CCR units

PHG

MCLG or MRDLG

Likely Source of Contamination

 

Gross Alpha

N

5.6

N/D/11.3

pCi/L

15

N/A

N/A

Erosion of natural deposits

Uranium

N

5.1

N/D/10.4

pCi/L

20

0.43

N/A

Erosion of natural deposits

Radon

N

268

256/524

pCi/L

N/A

N/A

0*

Naturally occurring in soil

INORGANIC CONTAMINANTS

Contaminant

Violation

Y/N

Level

Detected

Range

Unit

Measurement

MCL in CCR units

PHG

MCLG or MRDLG

Likely Source of Contamination

 

Arsenic

 

 

 

 

N

1.8

N/D/4.1

ppb

10

0.004

0.004

Erosion of natural deposits; runoff from orchards; glass and electronics production wastes

Fluoride

N

0.4

0.26/1.0

ppm

2.0

1

1

Erosion of natural deposits; water additive which promotes strong teeth; discharge from fertilizer and aluminum factories

Nitrate (as No3)

N

12

8.4/23

ppm

45

45

45

Runoff and leaching from fertilizer use; leaching from septic tanks and sewage; erosion of natural deposits

Nitrate + Nitrite as Nitrogen

N

2495

1800/6800

ppm

10,000

10,000

10,000

Runoff and leaching from fertilizer use; leaching from septic tanks and sewage; erosion of natural deposits

DISTRIBUTION SYSTEM - DISINFECTION BYPRODUCTS, DISINFECTANT RESIDUALS

Contaminant

Violation

Y/N

Level

Detected

Range

Unit

Measurement

MCL in CCR units

PHG

MCLG

Likely Source of Contamination

 

TTHMs - Total Trihalomethanes

N

2.5

2.5/45.5

ppb

80

N/A

N/A

Byproduct of drinking water chlorination

Halocetic Acids

N

0.3

0.3/8.0

ppb

60

N/A

N/A

Byproduct of drinking water disinfection

Chlorine

N

0.52

0.36/0.57

ppm

4.0

4

4

Drinking water disinfection added for treatment

 

SECONDARY STANDARDS

Constituent

Violation

Y/N

Level

Detected

Range

Unit

Measurement

MCL in CCR units

PHG

MCLG or MLDRG

Likely Source of Contamination

Chloride

N

17

4.5/53

ppm

500

N/A

N/A

Runoff/leaching from natural deposits; seawater influence

Barium
N
0.12 ND/130 ppb 1000 N/A N/A Discharge of oil drilling wastes and from metal refineries, erosion of natural deposits

Iron

N

0.14

ND/160

ppb

300

N/A

N/A

Leaching from natural deposits, industrial wastes

Odor

N

1

1/1

TON

3

N/A

N/A

Naturally occurring organic materials

pH

N

7.4

6.9/7.7

STD unit

6.5/8.5

N/A

N/A

Comparison of “Alkalinity” & “Acidity” of water

Specific Conductance

N

450

320/2560

US

1600

N/A

N/A

Substances that form ions when in water; seawater influence

Sulfate

N

39

20/120

ppm

500

N/A

N/A

Runoff, leaching from natural deposits; industrial waste

Total Dissolved Solids (TDS)

N

284

210/610

ppm

1000

N/A

N/A

Runoff, leaching from natural deposits

Foaming Agents (MBAS)

N

0.0005

N/D/0.020

ppb

500

N/A

N/A

Municipal and industrial waste discharges

 

ADDITIONAL CONSTITUENTS ANALYZED

Constituent

Violation

Y/N

Level

Detected

Range

Unit

Measurement

MCL in CCR units

PHG

MCLG or MRDLG

Likely Source of Contamination

Calcium

N

60

30/120

ppm

N/A

N/A

N/A

Natural in limestone, marble, chalk

Total Hardness

CA C03

N

187

95/330

ppm

N/A

N/A

N/A

Total concentration of calcium and magnesium

Total Alkalinity

N

125

120/320

ppm

N/A

N/A

N/A

Bicarbonate sand hydroxide components in raw water

Bicarbonate

N

222

140/390

ppm

N/A

N/A

N/A

Bicarbonate components in water

Magnesium

N

9

5.0/22.0

ppm

N/A

N/A

N/A

Metallic chemical element in soil

Potassium

N

3

2.8/4.6

ppm

N/A

N/A

N/A

Nutritional element in soil for humans

Sodium

N

32

15/99

ppm

N/A

N/A

N/A

Alkaline element industrial and chemical manufacturing

UNREGULATED CONTAMINANTS

Unregulated contaminant monitoring helps the EPA and the California Department of Health Services to determine where certain contaminants occur and whether the contaminants need to be regulated.

 
Chemical
Action Level
ppb
Level Detected
Range
Health Effects

Boron

1000

87

N/D/270 The babies of some pregnant women who drink water containing boron in excess of the notification level may have an increased risk of development effects based on studies in laboratory animals.

Chromium VI

(Hexavalent chromium)

N/A

  0.3

N/D/1.7

N/A 

 

 

Vanadium

0

4.2

N/D/4.6

The babies of some pregnant women who drink water containing vanadium in excess of the notification level may have an increased risk of development effects based on studies in laboratory animals.

 

LEAD & COPPER

Lead and Copper Rules became effective in 1993. The Company has performed six rounds of testing. The last round was performed in 2006. Another round is scheduled for July 2009. All samples are taken from first draw of morning water. The first two rounds were from 40 single-family residences with copper pipe with lead solder installed since 1982. Due to favorable results in earlier rounds, the 1997, 2000 and 2003 rounds included only 20 single-family residences.
Because of the increase in our customer base, the 2006 round of testing required us to sample 30 single-family residences.

 

Contaminant

90TH

Percentile

Unit

Measurement

MCL

In CCR Units

PHG

MCLG

Likely Source of Contamination

Lead

N/D

Ppb

AL 15

2

0

Internal corrosion of household plumbing system, discharge industrial mfg. erosion of natural deposits

Copper

0.36

Ppb

AL 1300

170

1300

Internal corrosion of household system, erosion of natural deposits


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