2008 Water Quality Table for Split Mountain
Primary Drinking Water Standards |
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Radiological |
Year Tested |
Unit |
MCL (SMCL) |
PHG (MCLG) |
Exceeded Standard? |
Range |
Average |
Source of Substance |
Gross alpha particle activity |
2005–2008 |
pCi/L |
15 |
(0) |
No |
ND–14 |
7 |
Erosion of natural deposits |
Radium 228 |
2005–2008 |
pCi/L |
5 |
0.019 (0) |
No |
ND–1.8 |
0.3 |
Erosion of natural deposits |
Radon 2221 |
2004–2007 |
pCi/L |
n/a |
n/a |
No |
6118–6360 |
6239 |
Erosion of natural deposits |
Uranium |
2005–2008 |
pCi/L |
20 |
0.43 |
No |
2–16 |
9 |
Erosion of natural deposits |
Inorganic |
Year Tested |
Unit |
MCL |
PHG (MCLG) |
Exceeded Standard? |
Range |
Average |
Source of Substance |
Arsenic2 |
2006–2008 |
ppb |
10 |
0.004 |
No |
1–8 |
4 |
Erosion of natural deposits; runoff from orchards; glass and electronics production wastes |
Chromium |
2006–2008 |
ppb |
50 |
(100) |
No |
ND–6 |
4 |
Discharge from steel and pulp mills and chrome plating; erosion of natural deposits |
Fluoride |
2006–2008 |
ppm |
2 |
1 |
No |
ND–0.23 |
0.18 |
Erosion of natural deposits; water additive that promotes strong teeth; discharge from fertilizer and aluminum factories |
Nitrate (as nitrate) |
2008 |
ppm |
45 |
45 |
No |
ND–3 |
2 |
Runoff and leaching from fertilizer use; leaching from septic tanks and sewage; erosion of natural deposits |
Year Tested |
Unit |
MCL |
PHG (MCLG) |
Exceeded Standard? |
Highest Level |
Lowest Monthly Percent |
Source of Substance |
|
Turbidity (surface water requiring filtration)3 |
2008 |
NTU |
TT |
n/a |
No |
0.45 |
35.7 |
Soil runoff |
Disinfection Byproducts |
Year Tested |
Unit |
MCL |
PHG (MCLG) |
Exceeded Standard? |
Range |
Highest Annual Average |
Source of Substance |
Total haloacetic acids |
2008 |
ppb |
60 |
n/a |
No |
ND–19 |
3 |
Byproduct of drinking water chlorination |
Total trihalomethanes |
2008 |
ppb |
80 |
n/a |
No |
1–17 |
5 |
Byproduct of drinking water chlorination |
Disinfectant and |
Year Tested |
Unit |
MRDL |
MRDLG |
Exceeded Standard? |
Range |
Average |
Source of Substance |
Chlorine |
2008 |
ppm |
4 |
4 |
No |
0.7–2.1 |
1.3 |
Drinking water disinfectant added for treatment |
Other Regulated Substances |
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Metals |
Year Tested |
Unit |
AL |
PHG |
Exceeded Standard? |
90th Percentile |
Samples > AL |
Source of Substance |
Copper |
2006 |
ppm |
1.3 |
0.3 |
No |
0.1 |
0 of 11 |
Internal corrosion of household plumbing systems; erosion of natural deposits; leaching from wood preservatives |
Lead |
2006 |
ppb |
15 |
2 |
No |
4.9 |
0 of 11 |
Internal corrosion of household plumbing systems; discharge from industrial manufacturers; erosion of natural deposits |
Secondary Drinking Water Standards and Unregulated Compounds |
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Inorganic Chemicals |
Year Tested |
Unit |
SMCL |
PHG (MCLG) |
Exceeded Standard? |
Range |
Average |
Source of Substance |
Calcium |
2006–2008 |
ppm |
n/a |
n/a |
No |
33–42 |
38 |
Erosion of natural deposits |
Chloride |
2006–2008 |
ppm |
500 |
n/a |
No |
5–11 |
8 |
Erosion of natural deposits; seawater influence |
Color |
2006–2008 |
Units |
15 |
n/a |
No |
ND–4 |
2 |
Naturally occurring organic matter |
Hardness |
2006–2008 |
ppm |
n/a |
n/a |
No |
110–141 |
130 |
Erosion of natural deposits |
Iron |
2006–2008 |
ppb |
300 |
n/a |
No |
ND–134 |
33 |
Leaching from natural deposits; industrial wastes |
Magnesium |
2006–2008 |
ppm |
n/a |
n/a |
No |
6–9 |
8 |
Erosion of natural deposits |
Manganese |
2006–2008 |
ppb |
50 |
n/a |
No |
ND–47 |
15 |
Leaching from natural deposits |
pH |
2006–2008 |
Units |
n/a |
n/a |
No |
7.2–8.2 |
7.7 |
Inherent characteristic of water |
Sodium |
2006–2008 |
ppm |
n/a |
n/a |
No |
17–22 |
20 |
Erosion of natural deposits; seawater influence |
Specific conductance |
2006–2008 |
µS/cm |
1600 |
n/a |
No |
270–359 |
334 |
Erosion of natural deposits; seawater influence |
Sulfate |
2006–2008 |
ppm |
500 |
n/a |
No |
11–36 |
23 |
Runoff/leaching from natural deposits; industrial wastes |
Total dissolved solids |
2006–2008 |
ppm |
1000 |
n/a |
No |
180–240 |
214 |
Runoff/leaching from natural deposits |
Turbidity (groundwater) |
2006–2008 |
NTU |
5 |
n/a |
No |
0.3–0.5 |
0.4 |
Soil runoff |
Vanadium |
2006–2008 |
ppb |
NL=50 |
n/a |
No |
ND–7 |
5 |
Erosion of natural deposits; manufacturing of alloys and steel |
Zinc |
2006–2008 |
ppm |
5.0 |
n/a |
No |
ND–0.2 |
0.1 |
Runoff/leaching from natural deposits; industrial wastes |
1Radon is a radioactive gas that you can't see, taste, or smell. It is found throughout the U.S. Radon can move up through the ground and into a home through cracks and holes in the foundation. It can build up to high levels in all types of homes. Radon can also get into indoor air when released from tap water from showering, washing dishes, and other household activities. Compared to radon entering the home through soil, radon entering the home through tap water will in most cases be a small source of radon in indoor air. Radon is a known human carcinogen. Breathing air containing radon can lead to lung cancer. Drinking water containing radon may also cause increased risk of stomach cancer. If you are concerned about radon in your home, test the air in your home. Testing is inexpensive and easy. Fix your home if the level of radon in your air is 4 picocuries per liter of air (pCi/L) or higher. There are simple ways to fix a radon problem that aren't too costly. For additional information, call your State radon program or call EPA's Radon Hotline (1-800-SOS-RADON).
2While your drinking water meets the U.S. Environmental Protection Agency standard for arsenic, it does contain low levels of arsenic. The arsenic standard balances the current understanding of arsenic's possible health effects against the costs of removing arsenic from drinking water. The USEPA continues to research the health effects of low levels of arsenic, which is a mineral known to cause cancer in humans at high concentrations and is linked to other health effects, such as skin damage and circulatory problems.
3For surface water systems, the treatment technique dictates that the turbidity level of the filtered water be less than or equal to 0.3 NTU in 95% of the measurements taken each month and not exceed 1 NTU at any time. In some months, the raw-water turbidity is so low that this system cannot achieve 95% reduction; this is not an indicator of poor-quality finished water. Turbidity is a measurement of the cloudiness of water. We monitor it because it is a good indicator of the effectiveness of our filtration system.
How to Read This Table
We test your water for more than 100 regulated contaminants. The table in this report lists only those that were detected.
The table shows water quality test results divided into two main sections: “primary standards” and “secondary standards.” Primary standards protect public health by limiting the levels of contaminants in drinking water. Secondary standards are limits for substances that could affect the water's taste, odor, or appearance.
Definitions
|
µS/cm = measure of specific conductance n/a = not applicable ND = not detected NTU = nephelometric turbidity unit pCi/L = picoCuries per liter (measure of radioactivity) ppb = parts per billion (micrograms per liter) ppm = parts per million (milligrams per liter) SMCL = secondary maximum contaminant level |
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 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 are economically and technologically feasible. Secondary MCLs are set to protect the odor, taste, and appearance of drinking water.
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 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.
Notification Level (NL): A health-based advisory level for an unregulated contaminant in drinking water. It is used by the California Department of Public Health to provide guidance to drinking water systems.
Primary Drinking Water Standard (PDWS): MCLs and MRDLs for contaminants that affect health, along with their monitoring, reporting, and water treatment requirements.
Regulatory Action Level (AL): The concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system must follow.
Treatment Technique (TT): A required process intended to reduce the level of a contaminant in drinking water.
Potential Sources of Contamination
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 water poses a health risk. More information about contaminants and potential health effects can be obtained by calling the U.S. Environmental Protection Agency (USEPA) Safe Drinking Water Hotline at (800) 426-4791.
The sources of drinking water (both tap and bottled) 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 human activity. Contaminants that may be present in source water include:
Microbial contaminants, such as viruses and bacteria, which may come from sewage treatment plants, septic systems, agricultural livestock operations, and wildlife.
Inorganic contaminants, such as salts and metals, which 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, which 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, which are by-products 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 the result of oil and gas production and mining activities.
In order to ensure that tap water is safe to drink, the U.S. Environmental Protection Agency (USEPA) and the California 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, which must provide the same protection for public health.
Some people may be more vulnerable to contaminants in drinking water than the general population. Immunocompromised people, such as those with cancer undergoing chemotherapy, those who have undergone organ transplants, those with HIV/AIDS or other immune system disorders, some elderly people, and infants, can be particularly at risk from infections. These people should seek advice from their health care providers about drinking water. USEPA/Centers for Disease Control and Prevention (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 at (800) 426-4791.