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1 67
Water Quality Data Table ,
The table below lists all of the drinking water this table is from testing performed in 1999.
contaminants that we detected during the The EPA or the State does not require us to
current reporting period. The presence of monitor annually for certain contaminants
contaminants in the water does not necessarily because the concentrations of these
indicate that the water poses a health risk. contaminants do not change frequently.
Unless otherwise noted, the data presented in
Water Quality Data Table
DETECTED
CONTAMINANTS(UNITS) MCLG MCL LEVEL Low HIGH VIOLATION TYPICAL SOURCE
z ICR DISINFECTION BY-PRODUCTS — - '_. a
Haloacetic Acids(HAA5) (ppb) MNR MNR 26.4 NA No By-product of drinking water chlorination.
INORGANIC CONTAMINANTS
Arsenic (ppb) NA 50 2.1 NA No Erosion of natural deposits;Runoff
from orchards;Runoff from glass and
electronics production wastes
Barium (ppm) 2 2 0.0147 NA No Discharge of drilling wastes;
Discharge from metal refineries;
Erosion of natural deposits
Chromium [Total] (ppb) 100 100 5.7 NA No Discharge from steel and pulp mills;
Erosion of natural deposits
Copper(ppm) 1.3 1.3 0.0017 NA No Erosion of natural deposits;Leaching
from wood preservatives;Corrosion
of household plumbing systems
Fluoride (ppm) 4 4 0.98 0.78 0.98 No Erosion of natural deposits;Water
additive which promotes strong
teeth;Discharge from fertilizer and
aluminum factories
Lead(ppb) 0 15 0 NA No Corrosion of household plumbing
systems;Erosion of natural deposits
Nickel (ppb) MNR MNR 1.2 NA No Erosion of natural deposits;Leaching
Nitrate [measured as Nitrogen] (ppm) 10 10 1.23 NA No Runoff from fertilizer use;Leaching
from septic tanks,sewage;Erosion of
natural deposits
Selenium(ppb) 50 50 37.4 NA No Discharge from petroleum and metal
refineries;Erosion of natural
deposits;Discharge from mines
Sodium (ppm) MNR MNR 146.62 NA No Erosion of natural deposits;Leaching
MICROBIOLOGICAL CONTAMINANTS ,4‹
Fecal coliform/E.Coll 0 NA 0 NA No Human and animal fecal waste
(#of monthly positive samples)
Total Coliform(#of monthly positive samples) 0 1 0 NA No Naturally present in the environment
Turbidity(NTU) NA TT<=0.5 0.11 NA No Soil runoff
(Conventional or Direct Filtration 95%of samples/month)
SYNTHETIC ORGANIC CONTAMINANTS INCLUDING PESTICIDES AND HERBICIDES
I Atrazine(ppb) 3 3 0.45 NA No Runoff from herbicide used on row crops
oliiiii.. , - i
UNREGULATED CONTAMINANTS
Bromochloromethane(ppb) MNR MNR 1.8 NA No
Dibromomethane (ppb) MNR MNR 0.7 NA No
Sulfate(ppm) MNR MNR 196 NA No Erosion of natural deposits.
VOLATILE ORGANIC CONTAMINANTS
Trichloroethylene (ppb) 0 5 0.5 NA No Discharge from metal degreasing sites
and other factories
TTHMs[Total Trihalomethanes] (ppb) 0 100 43$ 32.9 51.6 No By-product of drinking water chlorination
OTHER UNREGULATED SUBSTANCE TABLE
SUBSTANCE UNIT SUGGESTED DETECTED SIGNIFICANCE
LIMIT LEVEL
Chloride ppm 250 105 Some people can detect a salty taste above 250 ppm
Iron ppm 0.3 0.01 Can cause bad taste and stain plumbing fixtures and laundry
Silica ppm 50 16 Can cause scaling in water heaters
Important Drinking Water Definitions:
MCLG or Maximum Contaminant Level Goal:The level of a AL or Action Level:The concentration of a contaminant which, ppm:parts per million or milligrams per liter(mg/1)
contaminant in drinking water below which there is no known if exceeded,triggers treatment or other requirements which a ppb:parts per billion or micrograms per liter 1
or expected risk to health.MCLGs allow for a margin of safety. ' water system must follow. pp p p g p (Pg/)
MCL or Maximum Contaminant Level:The highest level of a NTU or Nephelometric Turbidity Units:Turbidity is a measure
g NA:Not applicable of the cloudiness of the water and it is a ood indicator of the
contaminant that is allowed in drinking water.MCLs are set as ND:Not detected effectiveness of our filtration system.
g
close to the MCLGs as feasible using the best available treat-
ment technology. NR:Not reported ICR:Information Collection Rule.
TT or Treatment Technique:A required process intended to MNR:Monitoring not required,but recommended. $:Annual average tested quarterly.
reduce the level of a contaminant in drinking water.
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