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Water System Name: |
Lake Elizabeth Mutual Water Co. |
Report Date: |
2007 |
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, 2006.
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Type of water source(s) in use: |
Surface Water
,California State Aqueduct Water
& Well |
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Name & location of source(s): |
Willowsprings turnout,
Munzs Ranch Road & |
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Well #2 Ranch Club |
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Drinking Water Source Assessment information: |
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Time and place of regularly scheduled board
meetings for public participation: |
Board meeting are |
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Held at 5:30p.m. at 14960 Elizabeth Lake
Road, Elizabeth Lake, California once each month. |
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For more
information, contact |
Lake Elizabeth Water
Co. |
Phone: |
(661)
724-1806 |
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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. Primary
Drinking Water Standards (PDWS):
MCLs 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. 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) pCi/L: picocuries per liter (a measure of
radiation) 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
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). Maximum
Residual Disinfectant Level (MRDL):
The level of a disinfectant added for water treatment that may not be
exceeded at the consumer’s tap. Maximum
Residual Disinfectant Level Goal (MRDLG): The level of a
disinfectant added for water treatment below which there is no known or
expected risk to health. MRDLGs are
set by the U.S. Environmental Protection Agency. 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 which a water system must follow. Variances and Exemptions:
Department permission to exceed an MCL or not comply with a treatment
technique under certain conditions. |
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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:
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Microbial contaminants, such as viruses and bacteria, that may
come from sewage treatment plants, septic systems, agricultural livestock
operations, and wildlife.
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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.
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Pesticides and herbicides, which may come from a variety of sources
such as agriculture, urban stormwater runoff, and residential uses.
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Organic chemical contaminants, including synthetic and volatile organic
chemicals, that are byproducts of industrial processes and petroleum
production, and can also come from gas stations, urban stormwater runoff, and
septic systems.
·
Radioactive contaminants, which 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, USEPA and the state Department of Health
Services (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 must 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 requires us to monitor for certain contaminants less than
once per year because the concentrations of these contaminants are not expected
to vary significantly from year to year.
Some of the data, though representative of the water quality, are more
than one year old.
Table 1 - sampling results showing the detection of coliform bacteria |
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Microbiological Contaminants (to be completed only if there was a detection of bacteria ) |
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.) 0 |
0 |
More than 1 sample in a month with a detection |
0 |
Naturally present in the environment |
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Fecal Coliform or |
(In the year) 0 |
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 (to be completed only if there was a detection of lead or copper in the last sample set) |
No. of samples collected |
90th percentile level detected |
No. Sites exceeding AL |
AL |
MCLG |
Typical Source of Contaminant |
Lead (ppb) |
10 |
2.3 |
0 |
15 |
2 |
Internal corrosion of household water plumbing systems; discharges from industrial manufacturers; erosion of natural deposits. |
Copper (ppm) |
10 |
.22 |
0 |
1.3 |
0.17 |
Internal corrosion of household water plumbing systems; erosion of natural deposits; leaching from wood preservatives. |
TAble 3 - sampling results for sodium and hardness |
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Chemical or Constituent |
Sample Date |
Level Detected |
Range of Detections |
MCL |
PHG (MCLG) |
Typical Source of Contaminant |
Sodium (ppm) |
2006 |
25 Aqueduct, 22 Well |
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none |
none |
Generally found in ground and surface water |
Hardness (ppm) |
2006 |
67.8 Aqueduct, 190 Well |
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none |
none |
Generally found in ground and surface water |
*Any violation of an MCL or AL is asterisked. Additional information regarding the violation is provided on the next page.
TAble 4 - detection of contaminants with a Primary Drinking Water Standard |
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Chemical or Constituent |
Sample Date |
Level Detected |
Range of Detections |
MCL |
PHG (MCLG) |
Typical Source of Contaminant |
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Antimony |
12/2006 |
ND |
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6 ug/l |
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Arsenic |
12/2006 |
ND |
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50 ug/l |
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Barium |
12/2006 |
27.3 ug/L |
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1000 ug/l |
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Beryllium |
12/2006 |
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4 ug/l |
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Cadmium |
12/2006 |
ND |
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5 ug/l |
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Chromium (Total Cr) |
12/2006 |
ND |
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50 ug/l |
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12/2006 |
0.6 mg/L |
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2.0 mg/l |
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Lead |
12/2006 |
0.4 ug/L |
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50 ug/l |
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Nitrate |
12/2006 |
4.2 mg/L |
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45 mg/l |
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12/2006 |
ND |
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1000 ug/l |
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Thallium |
12/2006 |
ND |
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2 ug/l |
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TAble 5 - detection of contaminants with a Secondary Drinking Water Standard |
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Chemical or Constituent |
Sample Date |
Level Detected |
Range of Detections |
MCL |
PHG (MCLG) |
Typical Source of Contaminant |
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Aluminum |
12/2006
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ND
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1000 ug/L
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Chloride |
12/2006 |
16 mg/L |
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250 mg/L
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Apparent Color |
12/2006
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15 color units |
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Copper |
12/2006 |
ND |
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1000 ug/L |
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Corrosion of home plumbing,
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300 ug/L |
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Manganese |
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ND |
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50 ug/L |
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Silver |
12/2006 |
ND |
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100 mg/L |
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Sulfate |
12/2006 |
24 |
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250 mg/L |
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Total Filterable Residue at 180 0C |
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270 mg/L |
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1000 mg/L |
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TABLE 6 - DETECTION OF UNREGULATED CONTAMINANTS |
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Chemical or Constituent (and reporting units) |
Sample Date |
Level Detected |
Action Level |
Health Effects Language |
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None Detected |
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None Detected |
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None Detected |
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None Detected |
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*Any violation of an MCL or AL is asterisked. Additional information regarding the violation is provided below.
Additional
General Information On Drinking Water
All 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).
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Summary Information for Contaminants
Exceeding an MCL or AL, or a Violation of any Treatment or Monitoring and
Reporting Requirements
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" NONE |
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For Systems Providing
Surface Water As A Source Of Drinking Water:
(Refer to page 1, “Type of Water Source” to see if your source
of water is surface water or groundwater)
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Table 7 -
sampling results showing TREATMENT OF |
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Treatment Technique – * |
(Type
of approved filtration technology used) Conventional treatment consisting of flocculation,
sedimentation, tri-media filtration and disinfection. |
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Turbidity Performance Standards
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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. |
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Lowest monthly
percentage of samples that met Turbidity Performance Standard No. 1.= 100% |
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Highest single
turbidity measurement during the year= 0.18 NTU |
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The number of
violations of any surface water treatment requirements = 0 |
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*
A required process intended to reduce the level of a contaminant in drinking
water.
** Turbidity (measured in NTU) is a measurement of the cloudiness of water and
is a good indicator of water quality and filtration performance. Turbidity results which meet performance
standards are considered to be in compliance with filtration requirements.
Summary Information for Surface Water
Treatment
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Turbidity units : source of
contaminant = soil runoff |
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