Water Quality
An Explanation of the Water-Quality Data Table
The table shows the results of our water-quality analyses. Every regulated contaminant that we detected in the water, even in the minutest traces, is listed here. The table contains the name of each substance, the highest level allowed by regulation (MCL), the ideal goals for public health, the amount detected, the usual sources of such contamination, footnotes explaining our findings, and a key to units of measurement. Definitions of MCL and MCLG shown below are important.
The data presented in this report is from the most recent testing done in accordance with regulations.
Key To Table
AL - Action Level: The concentration of a contaminant which, if exceeded, triggers treatment or other requirements that a water system must follow. MCLG - Maximum Contaminant Level Goal: The level of a contaminant in drinking water
below which there is no known or expected risk to health. MCLG's allow for a margin of safety. NTU - Nephelometric Turbidity Units: a measure of the clarity of the water. MRDL - The highest level of a residual disinfectant that is allowed in drinking water. MCL- Maximum Contaminant Level: The highest level of a contaminant that is allowed in drinking water. MCL's are set as close to the MCLG's as feasible using the best available treatment technology. MCL's are set at very stringent levels. To understand the possible health effects described for many regulated constituents, a person would have to drink 2 liters of water
every day at the MCL level for a lifetime to have a one-in-a-million chance of having the described health effect. PPM - parts per million, or milligrams per liter (mg/l). Corresponds to one penny in $10,000. Ppb - parts per billion, or micrograms per liter (ug/l). Corresponds to one penny in $10,000,000,000. TT - Treatment Technique: A required process intended to reduce the level of a
contaminant in drinking water. RAA - Running Annual Average. One year's data is available. pCi/L - Pico curies per liter: a measure of radioactivity. MRDLG - The level of disinfectants in drinking water below which there is no known or expected risk of health. MRDLG allows for a margin of safety. N/A - Not applicable. |
| Contaminant | Date Tested | Unit | MCL | MCLG | Detected Level | Range | Major Sources | Violation | | Inorganic Contaminants | | Lead | 2005 | Ppb | AL=15 | 0 | 4.1 | 1 of 30 sites sampled exceeded the action level. | Corrosion of household plumbing systems, Erosion from natural deposits. | NO | | Copper | 2005 | ppm | AL=1.3 | 0 | .054 | 0 of 30 sites sampled exceeded the action level. | Corrosion of household plumbing systems, Erosion from natural deposits. | NO | | Microbiological Contaminants | | Turbidity Lowest monthly % meeting standard was 100% | 2006 |
NTU | 0.30 | 0 | 0.26 | 100% Met | Soil runoff | NO | | Volatile Organic Contaminants | | TTHMs [Total Trihalomethanes] | 2006 | Ppb | 80 | 0 | 39 | 17 - 65 | By-product of drinking water chlorination. | NO | | Halo Acetic Acids | 2006 | Ppb | 60 | 0 | 27 | 13 - 46 | By-product of drinking water chlorination. EPA regulation requires us to monitor this contaminant while EPA considers setting a limit on it. | NO | |
| | Fluoride | 2006 | Ppm | 4 | 4 | 0.45 | N/A | Erosion of natual deposits, Water additive that promotes healthy teeth. | NO | | Nitrate | 2006 | Ppm | 10 | 10 | 0.28 | N/A | Runoff from fertilizer use. | NO | | Chlorine | 2006 | Ppm | MRDL 4 | MRDLG 4 | 1.15 | 0.90 - 1.3 | Water additive used to control microbial growth. | NO | | Total Organic Carbons | 2006 | Ppm | TT | TT | 1.26 | 1.19 - 1.34 | Naturally present in the environment. | NO | | |