Water System Name: |
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Report Date: |
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We test the drinking water quality for many constituents as required by
state and federal regulations. This
report shows the results of our monitoring for the period of January 1 -
December 31, 2009.
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Type of water source(s) in
use: |
Surface Water, = State Water Project (Aqueduct). |
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Name & location of
source(s): |
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Drinking Water Source
Assessment information: |
Brookwood Well assessment can be viewed at 14960 Elizabeth Lake Rd. |
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Time and place of
regularly scheduled board meetings for public participation: |
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For more information,
contact: |
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Phone: |
( 661 ) |
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TERMS USED
IN THIS REPORT |
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Maximum Contaminant Level (MCL): 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
technologically feasible. Secondary
MCLs are set to protect the odor, taste, and appearance of drinking water. Maximum Contaminant Level Goal (MCLG): The level of a
contaminant in drinking water below which there is no known or expected risk
to health. MCLGs are set by the U.S.
Environmental Protection Agency (USEPA). Public Health Goal (PHG): 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. Maximum Residual
Disinfectant Level (MRDL): The
highest level of a disinfectant allowed in drinking water. There is convincing evidence that addition
of a disinfectant is necessary for control of microbial contaminants. Maximum Residual
Disinfectant Level Goal (MRDLG): 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. |
Primary Drinking Water Standards (PDWS): MCLs and MRDLs for
contaminants that affect health along with their monitoring and reporting
requirements, and water treatment requirements. Secondary Drinking Water Standards (SDWS): MCLs for contaminants
that affect taste, odor, or appearance of the drinking water. Contaminants with SDWSs do not affect the
health at the MCL levels. Treatment Technique (TT): A required process intended to reduce the
level of a contaminant in drinking water. Regulatory Action Level (AL): The concentration of a contaminant which, if
exceeded, triggers treatment or other requirements that a water system must
follow. Variances and Exemptions: Department permission to exceed an MCL or
not comply with a treatment technique under certain conditions. ND:
not detectable at testing limit ppm:
parts per million or milligrams per liter (mg/L) ppb:
parts per billion or micrograms per liter (ug/L) ppt:
parts per trillion or nanograms per liter (ng/L) ppq:
parts per quadrillion or picogram per liter (pg/L) pCi/L: picocuries per liter (a measure of radiation) |
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The sources of drinking
water (both
tap water and bottled water) include rivers, lakes, streams, ponds, reservoirs,
springs, and wells. As water travels
over the surface of the land or through the ground, it dissolves
naturally-occurring minerals and, in some cases, radioactive material, and can
pick up substances resulting from the presence of animals or from human
activity.
Contaminants that may be present in
source water include:
·
Microbial contaminants, such as viruses and bacteria, that may come from
sewage treatment plants, septic systems, agricultural livestock operations, and
wildlife.
·
Inorganic contaminants, such as salts and metals, that can be
naturally-occurring or result from urban stormwater runoff, industrial or
domestic wastewater discharges, oil and gas production, mining, or farming.
·
Pesticides and herbicides, that may come from a variety of sources such as
agriculture, urban stormwater runoff, and residential uses.
·
Organic chemical contaminants, including synthetic and volatile organic chemicals,
that are by-products of industrial processes and petroleum production, and can
also come from gas stations, urban stormwater runoff, agricultural application,
and septic systems.
·
Radioactive contaminants, that can be naturally-occurring or be the result of
oil and gas production and mining activities.
In order to ensure that tap water is safe to drink, the USEPA and the state Department of Public Health
(Department) prescribe regulations that limit the amount of certain
contaminants in water provided by public water systems. Department regulations also establish limits
for contaminants in bottled water that provide the same protection for public
health.
Tables 1, 2,
3, 4, and 5 list all of the drinking water contaminants that were detected
during the most recent sampling for the constituent. The presence
of these contaminants in the water does not necessarily indicate that the water
poses a health risk. The Department
allows us to monitor for certain contaminants less than once per year because
the concentrations of these contaminants do not change frequently. Some of the data, though representative of
the water quality, are more than one year old.
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Table 1 – sampling results showing the detection of coliform bacteria |
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Microbiological
Contaminants (complete if
bacteria detected) |
Highest No. of Detections |
No. of months in violation |
MCL |
MCLG |
Typical
Source of Bacteria |
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Total Coliform Bacteria |
(In a mo.) |
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More
than 1 sample in a month with a detection |
0 |
Naturally
present in the environment |
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Fecal Coliform or E. coli |
(In the year) |
"0" |
A
routine sample and a repeat sample detect total coliform and either sample
also detects fecal coliform or E. coli |
0 |
Human
and animal fecal waste |
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Table 2 – sampling results showing the detection of Lead and copper |
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Lead and
Copper (complete if lead or copper
detected in the last sample set) |
No. of
samples collected |
90th percentile level
detected |
No. sites
exceeding AL |
AL |
PHG |
Typical
Source of Contaminant |
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Lead
(ppb) |
10 |
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15 |
2 |
Internal
corrosion of household water plumbing systems; discharges from industrial
manufacturers; erosion of natural deposits |
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Copper
(ppm) |
10 |
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1.3 |
0.17 |
Internal
corrosion of household plumbing systems; erosion of natural deposits;
leaching from wood preservatives |
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TAble 3 – sampling results for sodium and hardness |
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Chemical or
Constituent (and
reporting units) |
Sample Date |
Surface Water, Level
Detected |
Brookwood Well, |
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Typical Source
of Contaminant |
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Sodium
(ppm) |
10/22/09
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67 mg/L |
35 mg/L |
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none |
Salt
present in the water and is generally naturally occurring |
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Hardness
(ppm) |
10/22/09
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103 mg/L |
253 mg/L |
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none |
Sum
of polyvalent cations present in the water, generally magnesium and calcium,
and are usually naturally occurring |
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INORGANIC ---SURFACE WATER
TAble 4 – detection of
contaminants with a Primary Drinking Water Standard |
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Chemical or
Constituent |
Sample Date |
Surface Water, Level
Detected |
Brookwood Well, |
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Typical
Source of Contaminant |
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10/22/09 |
40 ug/L |
ND |
1000ug/L |
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4 ug/L |
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10 ug/L |
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10/22/09 |
40.0 ug/L |
68.7 ug/L |
1000 ug/L |
Discharge of drilling wastes; discharge from metal refineries; erosion of natural deposits |
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10/22/09 |
1 ug/L |
ND |
50 ug/L |
Discharge from steel and pulp mills; erosion of natural deposits |
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FLUORIDE |
10/22/09 |
0.1 mg/L |
0.5 mg/L |
2 mg/L |
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10/22/09 |
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0.8 ug/L |
NA |
Corrosion of household plumbing systems; erosion of natural deposits
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10/22/09 |
1 ug/L |
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100 ug/L |
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10/22/09 |
3 mg/L |
22.1 mg/L |
45 mg/L |
Runoff from fertilizer use; leaching from septic tanks, sewage; erosion of natural deposits |
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TAble 5 – detection of CONTAMINANTS With a secondary drinking water standard |
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Chemical or
Constituent |
Sample Date |
Surface Water, Level
Detected |
Brookwood Well, |
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Typical
Source of Contaminant |
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10/22/09 |
91 mg/L |
48 mg/L |
250-600 |
Water additive used to control microbes |
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10/22/09 |
200ug/L |
60 ug/L |
300ug/L |
Leaching of natural deposits, industrial discharge. |
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10/22/09 |
10ug/L |
ND |
50 ug/L |
Erosion of natural deposits |
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10/22/09 |
44 mg/L |
64 mg/L |
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NA |
Runoff / Corrosion of natural deposits, inustrial wastes |
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10/22/09 |
290mg/L |
N/A |
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Table 6 – RADIO CHEMICALS ANALYSIS (RADIOLOGICAL) |
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Chemical or
Constituent |
Sample Date |
Surface Water, Level
Detected |
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Typical
Source of Contaminant |
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10/22/09 |
5.14 pCi/L |
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15 pCi/L |
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10/22/09 |
0.000 pCi/L |
1.69 pCi/L |
50 pCi/L |
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10/22/09 |
2.32 pCi/L |
4.08 pCi/L |
20 pCi/L |
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10/22/09 |
0.289 pCi/L |
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2 pCi/L |
Erosion of natual deposits |
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10/22/09 |
120 pCi/L |
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20000 pCi/L |
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*Any violation
of an MCL, MRDL, or TT is asterisked.
Additional information regarding the violation is provided later in this
report.
Additional General Information on
Drinking Water
Drinking water, including bottled water, may
reasonably be expected to contain at least small amounts of some
contaminants. The presence of
contaminants does not necessarily indicate that the water poses a health risk.
More information about contaminants and potential health effects can be
obtained by calling the USEPA’s Safe Drinking Water Hotline (1-800-426-4791).
Some people may be
more vulnerable to contaminants in drinking water than the general
population. Immuno-compromised persons such
as persons with cancer undergoing chemotherapy, persons who have undergone
organ transplants, people with HIV/AIDS or other immune system disorders, some
elderly, and infants can be particularly at risk from infections. These people
should seek advice about drinking water from their health care providers.
USEPA/Centers for Disease Control (CDC) guidelines on appropriate means to
lessen the risk of infection by Cryptosporidium
and other microbial contaminants are available from the Safe Drinking Water Hotline
(1-800-426-4791).
Summary Information for Contaminants Exceeding an MCL, MRDL,
or AL or
Violation of Any TT or Monitoring and Reporting Requirement
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For Systems Providing Ground Water as a
Source of Drinking Water
(Refer to page 1, “Type
of water source in use” to see if your source of water is surface water or
groundwater)
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TAble 7 – Sampling Results
Showing feCal indicator-positive |
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Microbiological
Contaminants (complete if fecal-indicator detected) |
Total No. of Detections |
Sample |
MCL |
PHG |
Typical
Source of Contaminant |
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E. coli |
(In the year) |
7/22/09 |
0 |
(0) |
Human
and animal fecal waste |
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Enterococci |
(In the year) |
7/22/09 |
TT |
n/a |
Human
and animal fecal waste |
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Coliphage |
(In the year) |
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TT |
n/a |
Human
and animal fecal waste |
Summary Information for Fecal Indicator-Positive
Table 8 - sampling results showing TREATMENT OF SURFACE WATER SOURCES |
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Treatment Technique (a) (Type of approved filtration technology used) |
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Turbidity Performance Standards (b) (that must be met through the water treatment process) |
Turbidity of the filtered water must: 1 – Be less than or equal to 0.3 NTU in 95% of measurements in a month. 2 – Not exceed 1.0 NTU for more than eight consecutive hours. 3 – Not exceed 5.0 NTU at any time. |
Lowest monthly percentage of samples that met Turbidity Performance Standard No. 1. |
100%
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Highest single turbidity measurement during the year |
0.21 NTU |