Sampling Results
During the past year, we have taken hundreds of water samples in order to determine the presence of any radioactive, biological, inorganic, volatile organic or synthetic organic contaminants. The tables below show only those contaminants that were detected in the water. The state requires us to monitor for certain substances less often than once per year because the concentrations of these substances do not change frequently. In these cases, the most recent sample date are included, along with the year in which the sample was taken.
| REGULATED SUBSTANCE | |||||||
|---|---|---|---|---|---|---|---|
| Substance (Unit of Measure) | Year Sampled | MCL [MRDL] | MCLG [MRDLG] | Amount Detected | Range Low-High | Violation | Typical Source |
| Alpha Emitters (pCi/L) | 2012 | 15 | 0 | 11 | 0-11 | no | Erosion of natural deposits |
| Arsenic (ppb) | 2013 | 10 | 0 | 11 | 1.7-2.6 | No | Erosion of natural deposits; runoff from glass and electronics production wastes |
| Barium (ppm) | 2013 | 2 | 2 | 0.064 | 0.028-0.064 | No | Discharge of drilling wastes; Discharge from metal refineries; Erosion of natural deposits |
| Chromium (ppb) | 2013 | 100 | 100 | 6.6 | 2.2-6.6 | No | Discharge from steel and pulp mills; Erosion of natural deposits |
| Fluoride (ppm) | 2013 | 4 | 4 | 0.55 | 0.29-0.55 | No | Erosion of natural deposits; Water additive that promotes strong teeth; Discharge from fertilizer and aluminum factories |
| Haloacetic Acids [HAAs] Stage 1 (ppb) | 2014 | 60 | NA | 6 | 3.5-16 | No | By-product of drinking water disinfection |
| Nitrate (ppm) | 2014 | 10 | 10 | 3.6 | 2.7-3.6 | No | Runoff from fertilizer use; Leaching from septic tanks, sewage; Erosion of natural deposits |
| Selenium (ppb) | 2013 | 50 | 50 | 12 | 6-12 | No | Discharge from petroleum and metal refineries; Erosion of natural deposits; Discharge from mines |
| TTHMs {Total Trilhalomethanes]- Stage 1 (ppb) | 2014 | 80 | NA | 0.014 | 0.002-0.023 | No | By-product of drinking water disinfection |
| Uranium (ppb) | 2012 | 30 | 0 | 8.4 | 0-8.4 | No | Erosion of natural deposits |
| Tap water samples were collected for lead and cooper analyses from sample sites throughout the community. | |||||||
|---|---|---|---|---|---|---|---|
| Substance (Unit of Measure) | Year Sampled | AL | MCLG | Amount Detected (90th% Tile) | Sites Above AL/Total Sites | Violation | Typical Source |
| Cooper (ppm) | 2013 | 1.3 | 1.3 | 0.11 | 0/30 | No | Corrosion of household plumbing systems; Erosion of natural deposits |
| Lead (ppb) | 2016 | 15 | 0 | 1.2 | 0/30 | No | Corrosion of household plumbing systems; Erosion of natural deposits |
| SECONDARY SUBSTANCE | |||||||
|---|---|---|---|---|---|---|---|
| Substance (Unit of Measure) | Year Sampled | SMCL | MCLG | Amount detected | Range Low-High | Violation | Typical Source |
| Alkalinity Total (ppm) | 2013 | 300 | NA | 177 | 154-177 | No | NA |
| Calcium (ppm) | 2013 | 200 | NA | 66 | 42-66 | No | NA |
| Chloride (ppm) | 2013 | 250 | NA | 22 | 11-22 | No | Runoff/leaching from natural deposits |
| Conductivity (uS/cum) | 2013 | 1,500 | NA | 690 | 520-690 | No | Substance that form ions when in water |
| Corrosivity (Units) | 2013 | Noncorrosive | NA | 0.51 | 0.14-0.51 | No | Natural or industrially influenced balance of hydrogen carbon and oxygen in the water; Affected by temperature and other factors. |
| Gross Uranium By Activity (pCi/L) | 2013 | 30 | 0 | 9.8 | 0-9.8 | No | Erosion of natural deposits |
| Hardness, Total [as CaCO3] (ppm) | 2013 | 400 | NA | 290 | 190-290 | No | Naturally occuring |
| Iron (ppb) | 2013 | 300 | NA | 2 | 0.012-2 | No | Leaching from natural deposits; Industrial wastes |
| Magnesium (ppm) | 2013 | 150 | NA | 30 | 20-30 | No | Naturally occuring |
| Manganese (ppb) | 2013 | 50 | NA | 0.02 | 0.0086-0.02 | No | Leaching from natural deposits |
| Nickel (ppb) | 2013 | 100 | NA | 0.0026 | 0-0.0026 | No | Naturally occurring |
| pH (Units) | 2013 | 6.5-8.5 | NA | 8.2 | 7.8-8.2 | No | Naturally occurring |
| Potassium (ppm) | 2013 | 100 | NA | 4.2 | 7.8-8.2 | No | Naturally occurring; Found in water softeners |
| Silica (ppm) | 2013 | 50 | NA | 32 | 27-32 | No | Naturally occurring as sand, quartz, sandstone and granite |
| Sodium (ppm) | 2013 | 100 | NA | 39 | 21-39 | No | Naturally occurring; Component of water softeners |
| Sulfate (ppm) | 203 | 250 | NA | 160 | 60-160 | No | Runoff/leaching from natural deposits; Industrial wastes |
| Total Dissolved Solids [TDS] (ppm) | 2013 | 500 | NA | 450 | 320-450 | No | Runoff/leaching from natural deposits |
| Zinc (ppm) | 2013 | 5 | NA | 0.04 | 0.0072-0.04 | No | Runoff/leaching from natural deposits; Industrial wastes |
Definitions
- AL (Action Level): The concentration of a contaminant which, if exceeded, triggers treatment or other requirements that a water system must follow.
- uS/cm (microsiemens per centimeter): A unit expressing the amount of electrical conductivity of a solution.
- MCL (Maximum Contaminant Level): The highest level of contaminant that is allowed in drinking water. MCLs are set as close to the MCLs are set as close to the MCLGs as feasible using the best available treatment technology.
- MCLG (Maximum Contaminant 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 Disinfectant Level): The highest level of a disinfectant allowed in drinking water. There is a convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants.
- MRDLG(Maximum Residual Disinfectant Level): The level of a drinking water disinfectant below which there is a 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
- pCi/L (picocuries per liter): A measure of radioactivity
- 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).
- SMCL (Secondary Maximum Contaminant Level): SMCLs are established to regulate the aesthetics of drinking water like taste and odor.