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2015 Water Quality Data

Water at various locations in the distribution system is tested by certified City staff and a private, state-certified laboratory using the latest testing procedures and equipment. During 2015, numerous tests were conducted on samples taken from the distribution system. In addition to these tests, the SCVWD and SFPUC perform their own water quality analyses of the source and treated water.

Test results from the distribution system and source water analyses are shown in the table below. Some of the data, though representative, are more than one year old. SWRCB allows monitoring for some contaminants less than once per year since the concentrations of these contaminants do not change frequently.

Lab analysis was also performed for many constituents other than those listed in the tables; only those chemicals detected in the tap water are shown. For a complete list of all the chemicals analyzed or any questions about this report, please contact a Water Quality Engineer at 408-277-3671.


Primary Drinking Water Standards — Public Health-Related Standards
Parameter Unit MCL
(MRDL) [AL]
PHG
(MCLG) [MRDLG]
Evergreen
(SCVWD Treated
Water)
Evergreen
  (Groundwater)     
Edenvale
(Groundwater)
Coyote Valley
(Groundwater)
North San José/Alviso
(SFPUC Treated Water)
North San José
(Groundwater)
Typical Source
Inorganic Chemicals
Average Range Average Range Average Range Average Range Average Range Average Range  
Aluminum ppm 1 0.6 ND ND - 0.072 0.05b ND - 0.21 NDb ND NDc ND ND ND NDb ND 1
Barium ppm 1 2 ND ND 0.16b 0.15 - 0.16 0.14b 0.13 - 0.14 NDc ND ND ND 0.2b 0.2 - 0.2 1
Fluoride ppm 2 1 0.89a 0.4 - 1.2 0.13b 0.11 - 0.14 0.2b 0.2 - 0.2 0.16c  0.16 - 0.16 0.8 0.6 - 1.0 0.1b 0.1 - 0.1 1, 2
Hexavalent Chromium ppb 10 0.02 ND ND 4.8b 3.9 - 7.1 6.5b 4.2 - 8.8 4.3c 4 - 4.5 ND ND NDb ND 1, 12
Iron ppm 0.3 0.1 ND ND NDb ND - 0.27 NDb ND - 0.2 NDc ND ND ND 0.13 ND - 0.68 1
Nitrate (as NO3) ppm 45 45 ND ND - 4 11 10 - 12 8 7 - 15 ND ND - 2 ND ND 8 3 - 14 1, 3
Organic Chemicals        
Total Trihalomethanesd ppb 80 NS 50 29 - 75 NA NA NA NA NA NA 45 28 - 64 NA NA 4
Total Haloacetic Acidsd ppb 60 NS 12 0 - 15 NA NA NA NA NA NA 31 1 - 36 NA NA 4
Total Organic Carbon ppm TT NS 3.03 2.57 - 3.63 NA NA NA NA NA NA 2.1 1.4 - 5.2 NA NA 15
Radionuclides        
Gross Alpha Particle Activity pCi/L 15 0 ND ND 1b 0.04 - 2.5 NDc ND 3.2b ND - 6.3 ND ND NA NA 1
Disinfection        
Chloramine (as chlorine)a ppm (4) [4] 1.20 0.02 - 2.4 NA NA NA NA - 2.5* NA NA - 3.9* 2.9 1.2 - 3.4 NA NA 5
Microbiological        
Giardia lamblia cyst/L TT (0) 0.2 0.2 - 0.2 NA NA NA NA NA NA 0.01 ND - 0.08 NA NA 6
  Highest
%
Range Highest
%
Range Highest
%
Range Highest
%
Range Highest # Range Highest # Range  
Total Coliforma % pos
per month
5 (0) 0.97% 0 - 0.97 0.97% 0 - 0.97 0.97% 0 - 0.97 0.97% 0 - 0.97 NA NA NA NA 6
# pos
per month
1 (0) NA NA NA NA NA NA NA NA 0 0 0 0 6
Clarity        
Turbidity
(unfiltered sources)
NTU 5 NS NA NA NA NA NA NA NA Highest Level
= 3.1
NA NA 7
Turbidity
(filtered sources)
NTU 1 NS Highest Level
= 0.12e
NA NA NA NA NA NA Highest Level
= 1e
NA NA 7
Lead and Copper 90th Percentile (# Samples Exceeding AL)
Leada ppb [15] 0.2 ND (0 of 54) ND (0 of 54)
ND (0 of 31) 8
Coppera ppb [1300] 300 190 (0 of 54) 190 (0 of 54)
ND (0 of 31) 8

Secondary Drinking Water Standards — Aesthetic Standards
 Parameter Unit SMCL Evergreen
(SCVWD Treated Water)
 Evergreen (Groundwater) Edenvale
(Groundwater)
Coyote Valley
(Groundwater)
North San José/Alviso
(SFPUC Treated Water)
North San José
(Groundwater)
Typical Source
Average Range Average Range Average Range Average Range Average Range Average Range  
Chloride ppm 500 80 65 - 109 48b 45 - 53 45b 43 - 48 42c 40 - 43 8.4 ND - 16 38b 30 - 45 9, 10
Color CU 15 ND ND NDb ND NDb ND 1c 0 - 1 ND ND - 5 NDb ND 11
Odor TON 3 1 1 - 1 NDb ND 1b ND - 1 NDc ND ND ND NDb ND 11
Specific Conductance μS/cm 1600 638 615 - 680 808b 760 - 840 690b 680 - 730 530c 520 - 540 144 34 - 213 755b 630 - 880 10, 14
Sulfate ppm 500 64 58 - 74 69b 65 - 73 49b 48 - 49 37c 36 - 37 15 1.2 - 30 67b 51 - 82 9, 12
Total Dissolved Solids ppm 1000 380 314 - 530 548b 530 - 590 395b 380 - 440 310c 310 - 310 54 ND - 93 455b 370 - 540 9
Turbidity NTU 5 0.06 0.05 - 0.08 1b ND - 2.6 0.31b 0.27 - 0.77 0.52c 0.10 - 0.61 0.1 0.1 - 0.3 0.49b 0.18 - 0.79 7

Other Water Quality Parameters
Parameter Unit MCL

Evergreen
(SCVWD Treated Water)

 Evergreen  
(Groundwater) 

Edenvale
(Groundwater)
Coyote Valley
(Groundwater)
North San José/Alviso
(SFPUC Treated Water)
North San José
(Groundwater)
Average Range Average Range Average Range Average Range Average Range Average Range
Boron ppb NS 168 140 - 206 NA NA NA NA NA NA 103 103 NA NA
Calcium ppm NS 30 25 - 36 63b 56 - 70 49b 45 - 49 41c 40 - 41 11 3 - 18 78b 58 - 97
Hardness
(as CaCO3)f
ppm NS 159 135 - 179 402b 388 - 422 305b 300 - 310 230c 220 - 240 42 13 - 65 305b 220 - 390
Magnesium ppm NS 17 16 - 20 60b 56 - 68 45b 43 - 46 33c 30 - 35 3.7 0.2 - 5.6 28b 19 - 37
pH - NS 7.7 7.5 - 7.8 7.7b 7.6 - 7.9 8b 7.9 - 8 7.7c 7.7 - 7.7 9 7.1 - 9.9 8b 7.8 - 8.1
Potassium ppm NS 3.1 2.7 - 3.9 NA NA NA NA NA NA 0.6 0.2 - 0.9 NA NA
Silica ppm NS 11 10 - 15 NA NA NA NA NA NA 4.7 3.7 - 5.4 NA NA
Sodium ppm NS 60 48 - 76 38b 34 - 42 31b 30 - 35 20c 19 - 21 13 2.9 - 19 40b 34 - 45


* Temporary chlorination was performed during April 2015 and October 2015 for maintenance purposes. No chlorine was present in the service area during the remainder of the year.
 
Notes:
  1. Distribution system data in 2015.
  2. Well data in 2014.
  3. Well data in 2013.
  4. Distribution system data in 2015. Running averages are
    calculated from data for previous quarters that are not
    shown in this table.
  5. Filtered water turbidity required to be < 0.3 NTU in 95%
    of samples. All filtered water sources met this standard.
  6. To convert hardness from ppm to grains per gallon, divide
    by 17.1.


Typical Sources in Drinking Water:
  1. Erosion of natural deposits
  2. Water additive that promotes strong teeth
  3. Runoff/leaching from fertilizers
  4. By-product of drinking water disinfection
  5. Added for disinfection
  6. Naturally present in the environment
  7. Soil runoff
  8. Internal corrosion of household plumbing systems
  9. Runoff/leaching of natural deposits
  10. Seawater influence
  1. Naturally-occurring organic material
  2. Industrial waste
  3. Industrial discharges
  4. Substances forming ions in water
  5. Various natural and man made sources
  6. Naturally occurring
  7. Human/animal fecal waste
  8. Discharge from steel and pulp mills, chrome plating
  9. Discharge from metal factories

Definitions:
AL (Regulatory Action Level) The concentration of a contaminant which, if exceeded, triggers treatment or other requirements that a water system must follow.
MCL (Maximum Contaminant Level) The highest level of a contaminant that is allowed in drinking water. Primary MCLs are set as close to the PHGs (or MCLGs) as is economically and technically feasible.
Secondary MCLs are set to protect the odor, taste, and appearance of drinking water.
MCLG (Maximum Contaminant Level Goal) The level of a contaminant in drinking water below which there is no known or expected risk to health. MCLGs are set by the USEPA.
MRDL (Maximum Residual Disinfectant Level) The highest level of a disinfectant allowed in drinking water. There is convincing evidence that addition of a disinfectant is necessary for controlof microbial contaminants.
MRDLG (Maximum Residual Disinfectant Level Goal) 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.
NL (Notification Level) Health-based advisory levels established by the CDPH for chemicals in drinking water that lack maximum contaminant levels.
PDWS (Primary Drinking Water Standard)  MCLs and MRDLs for contaminants that affect health along with their monitoring, reporting, and water treatment requirements.
PHG (Public Health Goal) The level of a contaminant in drinking water below which there is no known or expected risk to health. PHGs are set by the California Environmental Protection Agency.
Source Water Raw water that has not been treated to meet drinking water standards.
Treated Water Water that has been treated to meet USEPA and CDPH drinking water standards.
Treatment Technique  A required process intended to reduce the level of a contaminant in drinking water.

Abbreviations:
 <  less than
 AL  Action Level
 CU  Color Unit
 NA  Not Applicable
 ND  Not Detected
 NS  No Standard
 NTU  Nephelometric Turbidity Units
 pCi/L  pico Curies per liter
 ppb  parts-per-billion (equals 1 microgram per liter (µg/L))
 ppm  parts-per-million (equals 1 milligram per liter (mg/L))
 TON  Threshold Odor Number
 TT  Treatment Technique
 µS/cm  microSiemens per centimeter

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