Red Hill Water Testing Results

What are the results from last year's testing?

The table shows which compounds were detected in your drinking water. The following are a few terms which need to be defined to understand the table.

  • Maximum Contaminant Level Goal (MCLG): the level of a contaminant in drinking water below which there is no known or expected health risk. MCLGs allow for a margin of safety.
  • Maximum Contaminant Level (MCL): the highest level of a contaminant that is allowed in the drinking water. MCLs are set as close to the MCLGs as possible using the best available treatment technology.
  • Maximum Residual Disinfectant Level (MRDL): the highest level of a disinfectant allowed in drinking water. The 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 health risk.
  • ppb: parts per billion, or micrograms per liter (ug/l). One part substance per billion parts of solution.
  • ppm: parts per million, or milligrams per liter (mg/l). One part substance per million parts of solution.
  • pCi/l: picocuries per liter. This is a measure of radioactivity.
  • ND: not detected by test method.
  • Action Level (AL): the concentration of a contaminant, which, if exceeded, triggers treatment or other actions by the water provider. This term is typically limited to discussions of lead and copper concentrations.
  • n/a: not applicable.
  • < : less than.
Red Hill Test Results

Click on the chart above to enlarge it.

  • 1Unit of measure for total and fecal coliform bacteria is the presence or absence of bacteria in a 100 ml sample.
  • 2No monthly sample collected within the distribution system showed the presence of coliform bacteria of any kind.
  • 3Fecal coliform MCL: A routine sample and a repeat sample are total coliform positive, and at least one is also fecal coliform positive.
  • 4Sampled in September, 2016.
  • 5EPA considers 50 pCi/l to be the level of concern for beta particles.
  • 6Sampled in September, 2015 from four residences and the elementary school. Scheduled to be sampled again in 2018.
  • 7The value reported is the 90th percentile of all data collected. (5 samples)
  • 8Volatile organic compounds (VOCs) were sampled in June, September and December, 2017, and tested by the State Laboratory. These VOCs are apparently being leached from the inner coating of the water storage tank. They are absent from the raw (untreated) well water.
  • 9Value reported is system-wide average.
  • 10 TTHMs and HAAs were sampled in August, 2015 at the connection most distant from the well house; this is assumed to be the point of highest concentration. Scheduled to be sampled again in 2018.
  • 11 Sampled in August, 2015. Scheduled to be sampled again in 2018.

What do all these numbers mean?

This information shows that your drinking water met and exceeded all regulatory requirements during 2017. We are fortunate to have a contaminant-free and reliable source for your drinking water needs, and a well-operated and maintained treatment facility. Additional information is provided below that will give you more detail on each potentially harmful contaminant or compound detected in your drinking water.