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					                                       Southern California Water Co. - Simi Valley System - Source Water Quality
Primary Standards - Health             PRIMARY         PHG        Range of        Average                        Most Recent
Based (units)                            MCL          (MCLG)      Detection        Level       MCL Violation?   Sampling Date   Typical Source of Constituent


Highest single measurement of the      TT = 1.0         n/a          0.07           n/a             No              2004        Soil runoff
Treated Surface Water (NTU)

Lowest Percent of all Monthly           TT = 95         n/a         100%            n/a             No              2004        Soil runoff
Readings less than 0.3 NTU (%)

Inorganic Constituents

Aluminum (mg/L)                           1             0.6       ND - 0.055        ND              No              2004        Erosion of natural deposits; residue for some
                                                                                                                                water treatment processes

Fluoride (mg/L)                           2              1         0.1 - 0.2        0.2             No              2004        Erosion of natural deposits; water additive that
                                                                                                                                promotes strong teeth; discharge from fertilizer
                                                                                                                                and aluminum factories

Nitrate (as NO3) (mg/L)                   45             45       ND - 38.0         5.0             No              2004        Runoff and leaching from fertilizer use; leaching
                                                                                                                                from septic tanks and sewage; erosion of
                                                                                                                                natural deposits

Selenium (ug/L)                           50            (50)       ND - 15           5              No              2004        Discharge from petroleum, glass, and
                                                                                                                                metal refineries; erosion of natural deposits;
                                                                                                                                discharge from mines and chemical
                                                                                                                                manufacturers; runoff from livestock lots (feed

Radioactive Constituents

Gross Alpha particle activity             15            (0)       ND - 14.9         3.7             No              2004        Erosion of natural deposits

Gross Beta (pCi/L)                        50            (0)        ND - 6.2         ND              No              2004        Erosion of natural deposits

Uranium (pCi/L)                           20            (0)       ND -13.8          3.6             No              2004        Erosion of natural deposits

Secondary Standards - Aesthetic      SECONDARY         PHG        Range of        Average                        Most Recent
(units)                                 MCL           (MCLG)      Detection        Level       MCL Violation?   Sampling Date   Typical Source of Constituent

Aluminum (ug/L)                          200            600        ND - 55          ND              No              2004        Erosion of natural deposits; residue for some
                                                                                                                                water treatment processes

Odor Threshold (Units)                    3             n/a          1-3            1.3             No              2004        Naturally-occurring organic materials

Turbidity of ground water sources         5             n/a       0.02 - 0.10       0.06            No              2004        Sediment in well/leaching from natural deposits

Color (units)                             15            n/a         ND - 6           2              No              2004        Naturally-occurring organic materials

Total Dissolved Solids (mg/L)            1,000          n/a       266 - 620        381.1            No              2004        Runoff/leaching from natural deposits

Specific Conductance                     1,600          n/a       479 - 740         621             No              2004        Substances that form ions when in water;
(micromhos)                                                                                                                     seawater influence

Chloride (mg/L)                          500            n/a        65 - 96          83.3            No              2004        Runoff/leaching from natural deposits; seawater

Sulfate (mg/L)                           500            n/a        39 - 130         76.7            No              2004        Runoff/leaching from natural deposits; industrial

Unregulated Constituent                                PHG        Range of        Average                        Most Recent
Requiring Monitoring (units)             MCL          (MCLG)      Detection        Level       MCL Violation?   Sampling Date   Typical Source of Constituent

Boron (ug/L)                         Not Regulated   NL = 1000    150 - 680        346.7            n/a             2004

Vanadium (ug/L)                      Not Regulated    NL = 50      ND - 8.5         4.3             n/a             2004

Other Parameters (units)                 MCL           PHG        Range of        Average      MCL Violation?    Most Recent    Typical Source of Constituent
                                                      (MCLG)      Detection        Level                        Sampling Date

Hardness as CaCO3 (mg/L)             Not Regulated      n/a        22 - 22          22              n/a             2004        Leaching from natural deposits

Sodium (mg/L)                        Not Regulated      n/a        52 - 150         91.7            n/a             2004        Leaching from natural deposits

Magnesium (mg/L)                     Not Regulated      n/a        13 - 71          33.3            n/a             2004        Runoff/leaching from natural deposits, seawater

Calcium (mg/L)                       Not Regulated      n/a        22 - 58          36.7            n/a             2004        Runoff/leaching from natural deposits, seawater

Potassium (mg/L)                     Not Regulated      n/a        3.0 - 3.2        3.1             n/a             2004        Runoff/leaching from natural deposits, seawater

pH (unit)                            Not Regulated    6.5 - 8.5    7.1 - 8.4        7.9             n/a             2004        Runoff/leaching from natural deposits, seawater

N-Nitrosodimethylamine[NDMA]         Not Regulated    NL=10        ND - 5.9         2.6             n/a             2004        Aerospace industry

                                 Southern California Water Co. - Simi Valley System - Distribution System Water Quality
                                                       PHG                       Highest 4-
Disinfection & Disinfection By-        PRIMARY        (MCLG)      Range of       Quarterly                       Most Recent
Products (units)                      MCL [MDRL]     [MDRLG]      Detection       Average      MCL Violation?   Sampling Date   Typical Source of Constituent

TTHMs [Total of four                      80            n/a       35.7 - 95.3       59.9            No              2004        By-product of drinking water chlorination
Trihalomethanes] (ug/L)

HAA5 [Total of five Haloacetic            60            n/a       7.6 - 41.1        19.2            No              2004        By-product of drinking water chlorination
Acids] (ug/L)

Chloramines (mg/L)                        [4]           [4]        0.5 - 2.2        1.94            No              2004        Drinking Water Disinfection added for treatment

                                       ACTION          PHG        Range of                                       Most Recent
Inorganic Constituents (units)          LEVEL         (MCLG)      Detection     90th % Level   MCL Violation?   Sampling Date   Typical Source of Constituent

Copper (mg/L)                             1.3           0.17      ND - 0.55         0.27            No              2002        Internal corrosion of household plumbing
                                                                                                                                systems; erosion of natural deposits; leaching
                                                                                                                                from wood preservatives. None of the 30
                                                                                                                                samples collected exceeded the action level.
                                                                        U.S. Postage
           Southern California Water Company                            Pasadena, CA
                                                                       Permit No. 1132
           4680 E. Los Angeles Ave., Suite H
           Simi Valley, CA 93063

    “Do you know
     what’s in your
     drinking water?”
                       (Look inside...)


Simi Valley System                             Southern California Water Company

 Water Quality Report 2005
Water Quality Report
About This Report
                                                    Southern California Water Company (SCWC) supplies approximately 178 million gallons

    outhern California Water Company (SCWC) is proud to
                                                        of water daily to more than one million people in 10 counties throughout California.

    provide you with the 2005 Water Quality Report, which
contains valuable information about the quality of your
drinking water and the challenges we face to continue pro-
viding you with high quality water.
    The U.S. Environmental Protection Agency (EPA), the
California Department of Health Services (DHS) and the
California Public Utilities Commission (CPUC) are the agen-
cies responsible for establishing drinking water quality stan-
dards. The water we deliver to your homes and businesses
meets standards established by EPA, DHS and the CPUC. In
some cases, SCWC goes beyond what is required to moni-
tor for constituents that have known health risks. Southern
California Water Company uses only independent, state-
certified water quality laboratories for testing. Unregulated
contaminant monitoring helps the EPA determine where
certain contaminants occur and whether it needs to regu-
late those contaminants.
    Since 1991, SCWC and California water districts and
utilities have published an annual Water Quality Report to
customers. This year’s report, which contains water quality
and supply information for 2004, is in compliance with the
regulations of the 1996 Safe Drinking Water Act reauthoriza-
tion that charges EPA with updating and strengthening the
tap water regulatory program.
    To ensure that the water we provide you is safe to drink,
the EPA sets regulations that limit the amount of certain
contaminants in water. U.S. Food and Drug Administration
(FDA) regulations establish limits for contaminants in bot-
tled water that must provide the same protection for health.
    Throughout the year, SCWC has constructed or improved
various projects to help maintain drinking water standards                grass. If it springs back when you lift your foot, it doesn’t
for our customers. To assist us with the increasing cost of               need water. Set your sprinklers for more days in between
meeting and maintaining state and federal standards, the                  watering. Saves 750 – 1,500 gallons per month.
company submits a General Rate Case every three years to                  Fix leaky faucets and plumbing joints. Saves 20 gallons
the California Public Utilities Commission. The CPUC is                   per day for every leak stopped.
responsible for establishing water rates for Southern Cali-
                                                                          Install water-saving shower heads or flow restrictors.
fornia Water Company.
                                                                          Saves 500 to 800 gallons per month.
    SCWC is a subsidiary of American States Water Company,
a holding company publicly traded on the New York Stock                   Run only full loads in the washing machine and dish
Exchange. SCWC is one of several companies which come                     washer. Saves 300 to 800 gallons per month.
under American States Water Company. More than 330,000                    Use a broom instead of a hose to clean driveways and
customers throughout California and central Arizona rely                  sidewalks. Saves 150 gallons or more each time. At once
on American States Water Company for water delivery and                   a week, that’s more than 600 gallons a month.
wastewater treatment.                                                     Don’t water the sidewalks, driveways or gutter. Adjust
                                                                          your sprinklers so that water lands on our lawn or garden
Rain Doesn’t Wash Away Need for Saving Water                              where it belongs – and only there. Saves 500 gallons per

A  lthough this may be the wettest winter California has
   seen in more than 100 years, one season of rain doesn’t

wash away the need for water conservation.                            Safekeeping of Water Supplies and Facilities
   The following tips will help you use water wisely:                     o reduce the risk of terrorism affecting local water sup-
   Water your lawn only when it needs it. Step on your                    plies and distribution systems, Southern California
Water Company is following recom-                                                   and can pick up substances resulting
mendations from the Federal Bureau                                                  from the presence of animal or human
of Investigation, the United States Envi-                                           activity. The presence of contaminants
ronment Protection Agency, the Ameri-                                               does not necessarily mean water may
can Water Works Association and the                                                 be a health risk.
California Office of Emergency Services.                                                Contaminants that may be present
While water systems have a low relative                                             in source water include:
likelihood of experiencing terrorist acts,                                              Microbial contaminants, such as
these agencies advise that water sys-                                                   viruses and bacteria, which may
tems should guard against unplanned                                                     come from sewage treatment plants,
physical intrusion, review emergency                                                    septic systems, agricultural livestock
response plans, and increase vigilance.                                                 operations and wildlife.
Southern California Water Company
                                                                                        Inorganic contaminants, such as
has taken all these steps and is con-
                                                                                        salts and metals, which can be natu-
tinuing to look for additional safety
                                                                                        rally-occurring or result from urban
                                                                                        storm water runoff, industrial or
                                                                                        domestic wastewater discharges,
Sources of Supply                                                                       oil and gas production, mining and
T   he water delivered to customers
    in the Simi Valley system is treated
surface water purchased from the Cal-
                                                                                        Pesticides and herbicides, which
leguas Municipal Water District, which                                                  may come from a variety of sources
obtains its supply from the Metropoli-                                                  such as agriculture, urban storm
tan Water District of Southern Califor-                                                 water runoff and residential uses.
nia. The primary water supply is also supplemented with           Organic chemical contaminants, including synthetic
groundwater from the Simi Valley groundwater basin. The           and volatile organic chemicals, which are by-products of
groundwater is blended with the purchased water source,           industrial processes and petroleum production, and can
pursuant to a Department of Health Services approved plan,        also come from gas stations, urban storm water runoff
prior to delivery to customers.                                   and septic systems.
   Drinking water, including bottled water, may reason-           Radioactive contaminants, which can be naturally occur-
ably be expected to contain at least small amounts of some        ring or be the result of oil and gas production and mining
contaminants. As water travels over the surface of the land       activities.
or through the layers in the ground, it dissolves naturally       In order to ensure that tap water is safe to drink, USEPA
occurring minerals and, in some cases, radioactive material,   and the California Department of Health Services (Depart-
                                                               ment) prescribe regulations that limit the amount of certain
                                                               contaminants in water provided by public water systems.
  For People with                                              Department regulations also establish limits for contami-
                                                               nants in bottled water that must provide the same protec-
  Sensitive Immune Systems…                                    tion for public health.
       Cryptosporidium is a microbial pathogen found
  in surface water throughout the U.S. When ingested,          Source Water Assessment
  the organism may cause nausea, diarrhea, and other
  gastrointestinal symptoms. The organism comes
  from animal wastes and may be in surface water-
                                                               A    source water assessment was conducted for each of
                                                                    the two-groundwater wells serving the customers of
                                                               the Southern California Water Company – Simi Valley, in
  sheds. Surface water is purchased from Metropolitan          December 2002.
  Water District of Southern California, which tested for          Both groundwater well sources are considered most
  cryptosporidium and did not detect it in the water. If       vulnerable to one or more of the following activities, which
  detected, cryptosporidium is eliminated by an effec-         have been associated with contaminants that have been
  tive treatment combination including sedimentation,          detected in these water sources:
  filtration and disinfection.                                     Dry cleaners, known contaminant plumes (TDS, nitrate,
       Some people may be more vulnerable to constitu-             perchloroethylene)
  ents in the water than the general population. Immu-             Although these contaminants have been detected in
  nocompromised people, such as those with cancer              the water produced by both groundwater wells, all water
  undergoing chemotherapy, persons who have had                produced from these sources are blended with other water
  organ transplants, people with HIV/AIDS or other             sources, pursuant to a Department of Health Services
  immune system disorders, some elderly persons and            approved blending plan, prior to delivery to the distribution
  infants can be particularly at risk of infections. These     system. The blending operation ensures that all drinking
  people should seek advice about drinking water from          water standards are continuously attained in the delivered
  their healthcare providers.                                  water.
       The EPA and the Centers for Disease Control guide-          Both groundwater well sources are also considered most
  lines on appropriate means to lessen the risk of infec-      vulnerable to one or more of the following possible contami-
  tion by Cryptosporidium and other microbial contam-          nating activities. Contaminants associated with these activ-
  inants are available from the EPA’s safe drinking water      ities have not been detected in the water supply.
  hotline at (800) 426-4791.                                       Gas stations, repair shops, photo processing, high den-
  Measurements                                 used for sizing household water soft-           1 inch in 16 miles
                                               eners. One grain per gallon is equal to      Parts per billion:
     Water is sampled and tested               17.1 mg/L of hardness.                          1 drop in 14,000 gallons
  throughout the year. Contaminants
                                                   Nephelometric Turbidity Units               1 second in 32 years
  are measured in:
                                               (NTU) – A measurement of the clarity            1 inch in 16,000 miles
     parts per million (ppm) or milli-         of water. Turbidity in excess of 5 NTU       Parts per trillion:
     grams per liter (mg/L),                   is noticeable to the average person.            1 second in 32,000 years
     parts per billion (ppb) or micro-             Picocuries per liter (pCi/L) – A            1 inch in 16 million miles
     grams per liter (µg/L),                   measurement of radioactivity in                 10 drops in enough water to fill
     parts per trillion (ppt) or nano-         water.                                          the Rose Bowl
     grams per liter (ng/L),                       If this is difficult to imagine, think   Parts per quadrillion:
     parts per quadrillion (ppq) or            about these comparisons:                        1 drop in 13.2 billion gallons
     picograms per liter (pg/L).               Parts per million:                              1 second in 31.7 million years
    Grains per gallon (grains/gal) – A             3 drops in 42 gallons                       1 drop in enough water to fill 100
  measurement of water hardness often              1 second in 12 days                         Rose Bowls

   sity housing, parking lots/malls, transportation corridors          risk of miscarriage from levels of THMs in drinking water.
   (railroads and freeways/state highways), water supply               State officials have cautioned that the study is not definitive
   wells, known contaminant plumes (perchlorate)                       and have stated that more study on the issue is needed.
   A copy of the complete assessment may be viewed at                      SCWC purchases water from Calleguas Municipal Water
         DHS Coastal District Office                                   District and routinely tests the water delivered to your home
         1180 Eugenia Place, Suite 200                                 for the presence of THMs, as well as many other substances.
         Carpinteria, CA 93013                                         Our testing shows the water delivered to your home may, at
                  or                                                   times, exceed the THM levels which were cited in the study.
                                                                       Be assured, however, that the water meets all existing federal
         SCWC – Simi Valley Office
                                                                       and state standards for safety.
         4680 E. Los Angeles Avenue, Suite H
                                                                           In the interest of caution, we recommend that women
         Simi Valley, CA 93063                                         who are in their first three months of pregnancy consult
   You may request a summary of the assessment be sent to              with their physician.
you by contacting:                                                         We will closely monitor future health studies and will
         DHS Coastal District Office                                   continue working with state and federal water quality offi-
         At 805-566-1326                                               cials to maintain the high standards of the quality of our
   For more details or information, contact John Brady,                water and to safeguard the health of our customers.
Water Quality Engineer, 800-999-4033.
Additional Notes                                                           In the Simi Valley System, nitrate was detected below the
                                                                       MCL, but at levels above half of the MCL. Nitrate in drink-
T    he State allows us to monitor for some contaminants
     less than once per year because the concentrations do
not change frequently. Some of our data, though representa-
                                                                       ing water at levels above 45 mg/L is a health risk for infants
                                                                       of less than six months of age. Such nitrate levels in drink-
tive, are more than a year old.                                        ing water can interfere with the capacity of the infant’s
                                                                       blood to carry oxygen, resulting in a serious illness; symp-
Turbidity                                                              toms include shortness of breath and blueness of the skin.
    Turbidity is a measure of the cloudiness of the water. It is       Nitrate levels above 45 mg/L may also affect the ability of the
monitored because it is a good indicator of the effectiveness          blood to carry oxygen in other individuals, such as pregnant
of the filtration system.                                              women and those with certain specific enzyme deficien-
Total Trihalomethanes                                                  cies. If you are caring for an infant, or you are pregnant, you
                                                                       should ask advice from your health care provider. Nitrate
   Trihalomethanes (THMs) are a family of chemicals
                                                                       levels may rise quickly for short periods of time because of
formed when a disinfectant such as chlorine is added to
                                                                       rainfall or agricultural activity.
the water supply. Disinfection is an important and neces-
sary step in the water treatment process to protect against
harmful bacteria and other possible contamination. Chlo-
rine is the most widely used and approved disinfection in              California Notification Level (NL)
the United States.                                                        Non-regulatory, health-based advisory levels established
   The amount of total THMs allowed in drinking water is               by DHS for contaminants in drinking water for which an
regulated by the United States Environmental Protection                MCL has not been established.
Agency. The EPA has a set total THM annual average safe                Maximum Contaminant Level (MCL)
limit of 100 parts per billion in drinking water.
                                                                          The highest level of a contaminant that is allowed in
   Results of a health study released in early 1998 suggests           drinking water. MCLs are set as close to the public health
that women who drink five glasses of water daily and are in            goals and maximum contaminant level goals as is economi-
their first three months of pregnancy may have an increased
cally and technologically feasible. Sec-                                                   If you see a milky appearance or if
ondary MCLs are set to protect the odor,                                               your drinking water appears to fizzle due
taste and appearance of drinking water.                                                to air there is no need to worry. If you are
                                                                                       unsure, give us a call.
Maximum Contaminant Level Goal
(MCLG)                                                                                 “Hard Water, Scale, Spots on
   The level of contaminant in drinking                                                Glassware”
water below which there is no known or                                                    Detergents can sometimes produce
expected risk to health. Maximum con-                                                  scale in cooking utensils and glassware
taminant level goals are set by EPA.                                                   can become coated with film or spots.
                                                                                       Some consumers think that it’s the hard
Maximum Residual Disinfectant
                                                                                       water which causes the excessive scale.
Level (MRDL)
                                                                                       Read below about white vinegar for more
   The level of a disinfectant added
for water treatment that may not be
exceeded at the consumer’s tap.                                                        “White Vinegar… not just for salad
Maximum Residual Disinfectant
                                                                                           The harder the water, the more white
Level Goal (MRDLG)
                                                                                       deposits (calcium carbonate) will form
   The level of a disinfectant added for
                                                                                       on glassware. When glassware is rinsed
water treatment below which there is no
                                                                                       with hot water, the water evaporates,
known or expected health risk. MRDLGs
                                                                                       leaving a white deposit. This can occur
are set by EPA.
                                                                                       in the dishwasher or in hand washing.
Primary Drinking Water Standard                                                        These spots can be removed by warm-
(PDWS)                                                              ing the glassware in water containing several tablespoon-
    MCLs for contaminants that affect health along with             fuls of white vinegar. White vinegar can be used to dissolve
their monitoring and reporting requirements, and water              scale found in coffee makers and tea pots used for boiling
treatment requirements.                                             water. Pots should be thoroughly rinsed after this cleaning
Public Health Goal (PHG)
   The level of a contaminant in drinking water below               “No matter how hard the water… it’s still good to drink”
which there is no known or expected risk to health. Public              Since hardness is usually measured in mg/L as cal-
health goals are set by the California Environmental Protec-        cium carbonate, it is identical to the mineral found in cal-
tion Agency.                                                        cium vitamin supplements. Hardness is principally due
                                                                    to calcium and magnesium ions which occur naturally in
Regulatory Action Level (AL)
                                                                    all water. The more calcium and magnesium present, the
    The concentration of a contaminant which, if exceeded,          greater the hardness.
triggers treatment or other requirements which a water sys-
tem must follow.                                                    “There are snowflakes in my ice!”
                                                                        Ice made with hard water can sometimes cause “snow-
Treatment Technique (TT)
                                                                    flakes” in a beverage container. When water is frozen, min-
   A required process intended to reduce the level of a con-        erals, particularly calcium and magnesium sulfates, can
taminant in drinking water.                                         become separated from the liquid. When the ice melts in a
                                                                    beverage, the precipitated minerals fall to the bottom of the
Drops of Water Knowledge                                            glass like “snowflakes” out of the sky. Some people may not
“Help! My water is fizzing!”                                        see the “snow” but will see the flakes at the bottom of the
    Do you sometimes see a milky or white appearance in             glass.
your drinking water? Does your water appear to fizzle or act        Our Commitment to You
like carbonated water?
                                                                       Public health and water safety is the primary focus of the
    If bubbles rise to the top and the water clears from the        Southern California Water Company. We pride ourselves in
bottom of the glass to the top in a few minutes, then the           delivering water to our customers that meets strict state and
milkiness is due to air. If very fine particles settle slowly to    federal drinking water standards.
the bottom of the glass, the milkiness could be due to inor-
ganic matter such as zinc.

If You Have Questions – Contact Us
   For information about your water quality or to find out         web site, please go to
about upcoming opportunities to participate in public meet-           For more information about health effects of the listed
ings, please contact John Brady, Water Quality Engineer, at        constituents in the following tables, call the EPA hotline at
(800) 999-4033. Visit us on the Web at or          (800) 426-4791.
e-mail us at                             Este informe contiene informacion muy importante
   In an effort to provide public awareness about cross con-       sobre su agua beber. Traduzcalo o hable con alguien que lo
nection control and backflow prevention programs, a website        entienda bien.
has been created to answer common questions. To visit the

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