Community Water System routinely monitors for constituents in your drinking water according to Federal and State laws. The test results table shows the results of our monitoring for the period of January 1st to December 31st, 2006. In the table you might find terms and abbreviations you are not familiar with. To help you better understand these terms we've provided the following definitions:
Action Level - the concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system must follow.
Maximum Contaminant Level (MCL) - 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 technology.
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 allow for a margin of safety.
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.
NA – not applicable
Nephelometric Turbidity Unit (NTU) – a unit of measurement for the clarity of water. Turbidity in excess of 5 NTU is just noticeable to the average person.
Parts per million (ppm) – a unit of measurement for detected levels of contaminants in drinking water. One part per million corresponds to one minute in two years or a single penny in $10,000.
Parts per billion (ppb) - a unit of measurement for detected levels of contaminants in drinking water. One part per billion corresponds to one minute in 2,000 years, or a single penny in $10,000,000.
Treatment Technique (TT) - a required process intended to reduce the level of a contaminant in drinking water.
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TEST RESULTS | ||||||||||||||||||||||||||
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MICROBIOLOGICAL CONTAMINANTS | ||||||||||||||||||||||||||
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Contaminant |
Violation Y/N |
Level Detected |
Unit of Measurement |
MCLG |
MCL |
Major Sources in Drinking Water | ||||||||||||||||||||
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Turbidity |
N |
Highest yearly sample result: 0.17 |
NTU |
NA |
> 0.3 NTU in > 5% of samples or any 1 sample > 1 NTU |
Soil runoff | ||||||||||||||||||||
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Lowest monthly % of samples meeting the turbidity limit: 100% | ||||||||||||||||||||||||||
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¨ 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. | ||||||||||||||||||||||||||
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INORGANIC CONTAMINANTS | ||||||||||||||||||||||||||
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Contaminant |
Violation Y/N |
Level Detected |
Unit of Measurement |
MCLG |
MCL |
Major Sources in Drinking Water | ||||||||||||||||||||
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Nitrate [as Nitrogen] |
N |
0.10 |
ppm |
10 |
10 |
Runoff from fertilizer use; leaching from septic tanks, sewage; erosion of natural deposits | ||||||||||||||||||||
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LEAD AND COPPER TAP MONITORING | ||||||||||||||||||||||||||
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Contaminant |
Number of Sites over Action Level |
90th Percentile Result |
Unit of Measurement |
Action Level |
Major Sources in Drinking Water | |||||||||||||||||||||
Lead |
1 |
0.004 |
ppm |
0.015 |
Corrosion from household plumbing systems; erosion of natural deposits. | |||||||||||||||||||||
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Copper |
0 |
<0.20 |
ppm |
1.3 | ||||||||||||||||||||||
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DISINFECTION BY-PRODUCT PRECURSORS | ||||||||||||||||||||||||||
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¨ The percentage of Total Organic Carbon (TOC) removal was routinely monitored in 2006, and our water system met all TOC removal requirements set by USEPA. Total organic carbon (TOC) has no health effects. However, total organic carbon provides a medium for the formation of disinfection by-products. These by-products include trihalomethanes (THMs) and haloacetic acids (HAAs). | ||||||||||||||||||||||||||
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REGULATED DISINFECTANTS | ||||||||||||||||||||||||||
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Disinfectant |
Violation Y/N |
Level Detected |
Unit of Measurement |
MRDLG |
MRDL |
Major Sources in Drinking Water | ||||||||||||||||||||
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Chlorine |
N |
Average: 1.29 Range: 0.13 – 2.64 |
ppm |
4 |
4 |
Water additive used to control microbes | ||||||||||||||||||||
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VOLATILE ORGANIC CONTAMINANTS | ||||||||||||||||||||||||||
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Contaminant |
Violation Y/N |
Level Detected |
Unit of Measurement |
MCLG |
MCL |
Major Sources in Drinking Water | ||||||||||||||||||||
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HAA5 [Haloacetic Acids] |
N |
Highest running annual average: 54.2 Range: 26.3 – 109.4 |
ppb |
0 |
60 |
By-products of drinking water disinfection | ||||||||||||||||||||
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TTHM [Total Trihalomethanes] |
N |
Highest running annual average: 58.2 Range: 14.5 – 121.2 |
ppb |
NA |
80 | |||||||||||||||||||||
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UNREGULATED CONTAMINANTS | ||||||||||||||||||||||||||
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Contaminant |
Level Detected |
Unit of Measurement |
MCLG |
Major Sources in Drinking Water | ||||||||||||||||||||||
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Chloroform |
13.2 |
ppb |
NA |
By-products of drinking water disinfection | ||||||||||||||||||||||
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Bromodichloromethane |
2.73 |
ppb |
0 | |||||||||||||||||||||||
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¨ Unregulated contaminants are those for which EPA has not established drinking water standards. The purpose of unregulated contaminant monitoring is to assist EPA in determining the occurrence of unregulated contaminants in drinking water and whether future regulation is warranted. MCLs (Maximum Contaminant Levels) and MCLGs (Maximum Contaminant Level Goals) have not been established for all unregulated contaminants. | ||||||||||||||||||||||||||
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