|Browse by contaminant|
Select a contaminant from the list below to see a county-level map. The maps represent the average concentration of the contaminant that has been detected in private well water in each county. Click on the year in parenthesis to see a map of the results for the most recent year (2010).
Arsenic (2010) *View a report of arsenic contamination in North Carolina that uses advanced spatial mapping techniques.
Ethylene dibromide (1,2, Dibromomethane) (2010)
Isopropyl ether (2010)
Tetrachloroethene (PCE) (2010) *View a moving map of tetrachloroethene (PCE) contamination in North Carolina that uses advanced spatial mapping techniques.
Trichloroethene (TCE) (2010)
Vinyl Chloride (2010)
Xylenes (Total xylenes) (2010)
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 January 15, 2013|