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Sampling Results
During
the past year, we have taken hundreds water samples in order to determine the
presence of any radioactive, biological, inorganic, volatile organic or synthetic
organic contaminates. The table below shows only those contaminates that were
detected in the water. Although all of the substances listed here are under
the Maximum Contaminant Level (MCL), we feel it is important that you know exactly
what was detected and how much of the substance was present in the water. The
state requires us to monitor for certain substances less than once per year
because the concentrations of these substances do not change frequently. In
these cases, the most recent sample data are included, along with the year
in which the sample was taken.
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REGULATED SUBSTANCES |
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|
SUBSTANCE (UNITS) |
YEAR SAMPLED |
MCL (MRDL) |
MCLG (MRDLG) |
AMOUNT DETECTED |
RANGE |
VIOLATION |
TYPICAL SOURCE |
|
Barium (ppm) |
2006 |
2 |
2 |
0.04 |
NA |
No |
Discharge of drilling wastes; Discharge from metal refineries; Erosion of natural deposits |
|
Chlorine (ppm) 1 |
2006 |
(4) |
(4) |
0.79 |
ND - 1.40 |
No |
Water additive used to control microbes |
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Fluoride (ppm) |
2006 |
4 |
4 |
0.97 |
0.63 - 1.20 |
No |
Erosion of natural deposits; Water additive which promotes strong teeth; Discharge from fertilizer and aluminum factories |
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Haloacetic Acids [HAA] (ppb)2 |
2006 |
60 |
NA |
22.9 |
11.5 - 46.8 |
No |
By-product of drinking water disinfection |
|
Nitrate (ppm) |
2006 |
10 |
10 |
0.23 |
NA |
No |
Runoff from fertilizer use; Leaching from septic tanks, sewage; Erosion of natural deposits |
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Total Organic Carbon (ppm) 4 |
2006 |
TT |
NA |
1.66 |
1.28 - 2.29 |
No |
Naturally present in the environment |
| Total Coliform Bacteria (% positive samples) | 2006 | 5% positive monthly samples | 0 | 1 | NA | No |
Naturally present in the environment |
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TTHMs [Total trihalomethanes] (ppb) 3 |
2006 |
80 |
NA |
49.6 |
28.5 - 79.2 |
No |
By-product of drinking water disinfection |
| Turbidity (Lowest monthly percent of samples meeting limit) | 2006 | TT | NA | 100 | NA | No |
Soil runoff |
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Turbidity (NTU) 5 |
2006 |
TT |
NA |
0.07 |
0.01-0.07 |
No |
Soil runoff |
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Tap water samples were collected from 31 homes throughout the service area. |
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SUBSTANCE (UNITS) |
YEAR SAMPLED |
ACTION LEVEL |
MCLG |
AMOUNT DETECTED (90th %tile) |
HOMES ABOVE Action Level |
VIOLATION |
TYPICAL SOURCE |
|
Copper (ppm) |
2004 |
1.3 |
1.3 |
0.04 |
0 |
No |
Corrosion of household plumbing systems; Erosion of natural deposits; Leaching from wood preservatives |
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Lead (ppb) 6 |
2004 |
15 |
0 |
1 |
0 |
No |
Corrosion of household plumbing systems; Erosion of natural deposits |
1 The amount reported is the monthly average of distribution samples. More than 50 samples are collected every month.
2 Some people who drink water containing haloacetic acids in excess of the MCL over many years may have and increased risk of getting cancer. The detected level denotes the maximum four-quarter running average of four sets of distribution samples.
3 Some people who drink water containing trihalomethanes in excess of the MCL over many years may experience problems with their liver, kidneys or central nervous system, or may have an increased risk of getting cancer. The detected levels denotes the maximum four-quarter running average of four sets of distribution samples.
4 The amount reported is the average of twelve monthly samples. Total Organic Carbon monitoring and removal is a treatment technique used to help reduce the amount of chlorine by products formed in the distribution system.
5 Turbidity is a measure of the cloudiness of the water. We monitor it because it is a good indicator of the effectiveness of our filtration system.
6 Of the samples tested for lead, 90% were at or below 1ppb. An informational packet about lead in drinking water is available at our main office. Infants and children who drink water containing lead in excess of the Action Level over many years could develop kidney problems or high blood pressure.
Table Definitions
AL (Action Level): The concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system must follow.
MCL (Maximum Contaminant Level): The highest level of a contaminant that is allowed in drinking water. MCLs are set as close to the MCLGs as feasible using the best available treatment technologyMCLG (Maximum Contaminant Level Goal): The level of a contaminant in drinking water below which there is no known or expected risk to health. MCLGs allow for a margin of safety.
MRDL (Maximum Residual Disinfection Level): 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.
MRDLG (Maximum Residual Disinfection Level Goal): 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 contamination..
NA: Not applicable.
ND: Not detected.
NTU (Nephelometric Turbidity, Units): Measurement of the clarity, or turbidity, of water.
ppb (Parts per billion): One part substance per billion parts water (or micrograms per liter).
ppm (Parts per million): One part substance per million parts water (or milligrams per liter).
TT (Treatment Technique): A required process intended to reduce the level of a contaminant in drinking water.
2006 REPORT TO CONSUMERS ON WATER
QUALITY
Water Quality Report •
Continuing Our Commitment
Community Participation •
Information on the Internet
Where Does My Water Come From? •
Source Water Assessment
Substances that might be in Drinking Water •
Is it Safe to Drink from a Garden Hose?
How is My Water Treated and Purified? •
Sampling Results
New Arsenic Regulations •
Important Health Information