Water Quality Report

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2015 Water Quality Report

The Town of Yountville is pleased to report this year that the drinking water supplied to you meets or exceeds state and federal public health standards for drinking water quality and safety. California water retailers, including the Town of Yountville, are required by law to inform customers about the quality of their drinking water. The results of the testing and monitoring programs of 2015 are included in this report. If you have any questions, please contact the Town of Yountville Public Works at 707-944-8851.

Please click here to view the 2015 Water Quality Report

Distribution System Information

Monitoring for bacteriological constituents in the distribution system is required to determine the presence of micro biological contaminants such as Coliform, Fecal Coliform, and E. Coli.

Coliform Bacteria Sampling 

 Maximum number of monthly samples required:
 Maximum number of monthly positive samples allowed (MCL): 1
 Average monthly number of samples taken in 2013: 3
 Total number of samples taken in 2013: 41
 Maximum number of positives in one month: 0
Total number of E. Coli sample positives: 0
Number of months in violation: 0

 

Chlorine Residual Monitoring

Disinfection is required to keep water safe, and chlorine is the agent used to disinfect. Chlorine dosage is strictly regulated so that the water has just enough without it being dangerous. The maximum residual level for Chlorine is 4 MG/L (milligrams per liter), and the minimum is 0.2 MG/L. The common level for our systems is between 0.5 and 1.5 MG/L.

MRDLG

(MG/L) 

MRDL

(MG/L) 

Range

(MG/L)

Low     |   High

RAA

(MG/L)

Meets Standard

Yes/No

Source 

 4

0.38   |    1.23

0.813

Yes

Drinking Water Disinfectant 

 

Disinfection By-Products Sampling

Disinfection by-product samples are taken for Haloacetic Acids and Trihalomethanes, which is currently done four times per year. Disinfection by-products are trace elements formed in the water after disinfection with Chlorine.  

 By-Product

MCL

(µG/L) 

Range

(µG/L)

Low   |   High

RAA

(µG/L) 

Meets Standard

Yes/No 

 Trihalomethanes

 80

44    |    60 

53.38 

Yes 

 Haloacetic Acids

 60

 16    |    44  

 28.38

 Yes

 

General Mineral and Physical Sampling

MCL’s for contaminants that relate to aesthetic qualities such as taste, color, mineral content and appearance are not directly related to health issues.

 Chemical or Constituent

MCL

Range

Low   |   High

RAA

Likely Source of Contamination

 Color

15

ND   | 70.0  

13.75 

Naturally occurring organic compounds 

 Odor

3

 1.0  |   20.0

5.33

Naturally occurring organic compounds or chlorine

 Turbidity

3

ND  |  5.5

1.23

Naturally occurring organic compound and soil runoff

 

Lead and Copper Tap Sampling

Lead and Copper occur naturally in water in small amounts. The testing performed in this report is for Lead and Copper in drinking water that is primarily from materials and components associated with service lines and home plumbing systems. The Town is on a tri-annual sampling order and results are from the last sampling round.

 

Samples Collected

(Date) 

90%

Detected

(MG/L) 

 Number of Sites Exceeding

AL

(MG/L) 

Likely Source of Contamination 

 Lead

 10

(2015)

 0.0023

 0

 0.015

Internal corrosion of household water plumbing systems; discharges from industrial manufacturers; erosion of natural deposits.

 Copper

 10

(2015)

 0.42

 1.3

Internal corrosion of household water plumbing systems; erosion of natural deposits; leaching from wood preservatives.

 

Asbestos Sampling

Asbestos is a naturally occurring substance and can be found in small concentrations in water. Asbestos cement (AC) pipe was used extensively in the mid-1900s in potable water distribution systems, particularly in the western United States, Over time, AC pipe undergoes gradual degradation in the form of corrosion (i.e., internal calcium leaching due to conveyed water and/or external leaching due to groundwater). Some older areas of town still have AC pipe left in the system and the long term goal of the PW department is to replace all old pipes in town. The Town is on a tri-annual sampling order and results are from the last sampling round.

Chemical or Constituent

Units

MCL

(AL)

DLR

Result

(Date)

Violation

Yes/No

Likely Source of Contamination

Asbestos

MFL

7

7

ND

(2011)

No

Internal corrosion of asbestos cement water pipes; erosion of natural deposits.

 

Source Water Sampling

The following tables are sampling results performed by CDVA water treatment staff members and are a requirement for source water sampling by the California Department of Public Health. The data in these tables is provided to you so that all water quality related sampling and results for both source water and the Towns Water Distribution Sampling are available to you. A source water assessment was completed in July 2009 for the Rector Reservoir. Results from the Assessment indicate that the most significant potential sources of contaminants to our water source are from fires and vineyards. The complete assessment is available upon request by writing: Plant Operations, 190 California Dr., Yountville, CA 94599, or by contacting Joe Rodgers, Chief of Plant Operations III, VHC-Y, at (707) 944-4800.

 

 Reporting Units

Chemical

Analyses Results

DLR

MG/L

 Total Hardness
(as CaCO3)

47

 

MG/L

 Calcium (CA)

9

 

MG/L

 Sodium (NA)

8.1

 

MG/L

 Bicarbonate (HCO3)

46

 

MG/L +

 Sulfate (SO4)

3.8

 0.5

MG/L +

Chloride (C1)

6.9

 

MG/L

Nitrate (as NO3)

Less than 2.0

2.0

MG/L

Fluoride (F)

Less than .10

0.1

UMHO / CM +

Specific Conductance (E.C.)

99

 

MG/L +

Total Filterable Residue (TDS)

99

 

+ Indicates Secondary Drinking Water Standards