|Browse by county|
Click on the county name from the list below to view a chart of the well-testing results for that county.
Scope of the data and limitations
County-level averages are intended to provide private well-owners, local health departments, and government decision-makers with a visual tool for understanding groundwater contamination across the state and potential public health concerns in individual counties. Because county-level maps are not specific to smaller geographic areas and cannot be assumed to represent uniform concentration levels across a county, testing private wells is the only way to know whether an individual well is contaminated.
LimitationsCounty averages are calculated as the sum of all values recorded in a single county divided by the number of wells tested. Averages may be inflated because of a very high result at a single location, or may be artificially low because of a series of very low results. Data may also be skewed by the number of samples and the location in which the samples were taken. If only a few samples were recorded in an entire county, it is less likely that the reported average is reflective of a majority of wells in that county.
Click on a link for more information about the Toxics Release Inventory and National Priorities List reporting.
|Last updated June 19, 2013|