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2016 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 2016, 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)
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  
Aluminum ppm 1 0.6 0.06 ND - 0.18 NDc ND 0.2 ND - 0.4 ND ND - 0.06 NDc ND 1
Barium ppm 1 2 ND ND 0.14c 0.13 - 0.14 ND ND ND ND 0.2c 0.2 - 0.2 1
Fluoride ppm 2 1 0.89a 0.7 - 1.1 0.18c 0.15 - 0.2 0.15  0.14 - 0.15 0.6 0.5 - 0.8 0.1c 0.1 - 0.1 1, 2
Hexavalent Chromium ppb 10 0.02 ND ND 6.5c 4.2 - 8.8 3.9 3.4 - 4.4 ND ND NDc ND 1, 12
Nitrate (as N) ppm 10 10 ND ND - 1.2 1.8 1.5 - 2.4 ND ND - 0.7 ND ND 1.7 ND- 3.3 1, 3
Organic Chemicals        
Total Trihalomethanese ppb 80 NS 54 21 - 64 NA NA NA NA 56 34 - 68 NA NA 4
Total Haloacetic Acidse ppb 60 NS 10 ND - 17 NA NA NA NA 42 21 - 57 NA NA 4
Total Organic Carbon ppm TT NS 2.2 1.5 - 3.8 NA NA NA NA 2.4 1.6 - 5.3 NA NA 15
Radionuclides        
Gross Alpha Particle Activity pCi/L 15 0 ND ND NDd ND 3.8c ND - 6.3 ND ND NA NA 1
Disinfection        
Chloramine (as chlorine)a ppm (4) [4] 1.44 0.01 - 3.6 NA NA - 1.7* NA NA - 3.4** 2.9 0.5 - 4.1 NA NA 5
Microbiological        
Cryptosporidium oocysts/L TT (0) 0.1 0.1 - 0.1 NA NA NA NA ND ND NA NA 6
Giardia lamblia cyst/L TT (0) 0.1 0.1 - 0.1 NA NA NA NA 0.03 ND - 0.11 NA NA 6
  Highest
%
Range Highest
%
Range Highest
%
Range Highest # Range Highest # Range  
Total Coliforma % pos
per month
5 (0) 2.7% 0 - 2.7 2.7% 0 - 2.7 2.7% 0 - 2.7 NA NA NA NA 6
# pos
per month
1 (0) NA NA NA NA NA NA 0 0 0 0 6
Clarity        
Turbidity
(unfiltered sources)
NTU 5 NS NA NA NA NA NA Highest Level
= 3.2
NA NA 7
Turbidity
(filtered sources)
NTU 1 NS Highest Level
= 0.43f
NA NA NA NA Highest Level
= 1f
NA NA 7
Lead and Copper 90th Percentile (# Samples Exceeding AL)
Leadb ppb [15] 0.2 ND (0 of 54) ND (0 of 54)
ND (0 of 31) 8
Copperb 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)
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  
Chloride ppm 500 96 53 - 115 46c 43 - 48 42 40 - 43 8.8 ND - 16 38c 30 - 45 9, 10
Color CU 15 ND ND - 4 NDc ND 5 ND - 10 ND ND - 11 NDc ND 11
Iron ppm 0.3 ND ND NDc ND - 0.2 0.3 ND - 0.6 ND ND 0.12 0.11 - 0.12 1
Odor TON 3 1 1 - 1 1c ND - 1 ND ND ND ND NDc ND 11
Specific Conductance μS/cm 1600 644 325 - 736 703c 680 - 730 525 520 - 530 146 31 - 218 755c 630 - 880 10, 14
Sulfate ppm 500 62 20 - 70 49c 48 - 49 37 37 - 37 16 1 - 30 67c 51 - 82 9, 12
Total Dissolved Solids ppm 1000 365 180 - 424 410c 380 - 440 355 350 - 360 63 ND - 95 455c 370 - 540 9
Turbidity NTU 5 0.05 0.05 - 0.16 0.46c 0.27 - 0.77 2.9 0.8 - 5.1 0.2 ND - 0.5 0.49c 0.18 - 0.79 7

Other Water Quality Parameters
Parameter Unit MCL

Evergreen
(SCVWD Treated Water)

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
Boron ppb NS 175 ND - 227 NA NA NA NA ND ND - 123 NA NA
Calcium ppm NS 23 11 - 28 47c 45 - 49 42 41 - 42 10 2 - 18 78c 58 - 97
Hardness
(as CaCO3)f
ppm NS 124 58 - 136 304c 300 - 310 241 234 - 247 44 8 - 76 305c 220 - 390
Magnesium ppm NS 14 8 - 15 45c 43 - 46 33 31 - 35 3.6 0.2 - 6 28c 19 - 37
pH - NS 7.8 7.6 - 7.9 8c 7.9 - 8 7.4 7.4 - 7.5 9.4 8.2 - 9.8 8c 7.8 - 8.1
Potassium ppm NS 3.8 2.0 - 4.4 NA NA NA NA 0.6 0.2 - 1 NA NA
Silica ppm NS 14 6 - 15 NA NA NA NA 5.3 5.1 - 5.7 NA NA
Sodium ppm NS 71 36 - 80 32c 30 - 35 20c 18 - 22 11 2.6 - 17 40c 34 - 45


* Temporary chlorination was performed during November 2016 for maintenance purposes.
**Temporary chlorination was performed during June 2016 and October 2016 for maintenance purposes. No chlorine was present in the service area during the remainder of the year.
***SCVWD treated surface water was delivered to the Edenvale distribution system from 2/23/2016 - 3/25/2016 and 11/16/2016 - 12/31/2016. Refer to the Evergreen data column in this table for details on the quality of the water supply.
 
Notes:
  1. Distribution system data in 2016.
  2. Distribution system data in 2015.
  3. Well data in 2014.
  4. Well data in 2013.
  5. Distribution system data in 2016. Running averages are
    calculated from data for previous quarters that are not
    shown in this table.
  6. Filtered water turbidity required to be < 0.3 NTU in 95%
    of samples. All filtered water sources met this standard.
  7. 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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