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evaluations of the data. The new database that went on-line in the Spring of 2007 included additional quality control checks to improve location data.

When reviewing PWTA results, it is important to remember that the tests were conducted on an untreated or raw water sample collected prior to any water treatment system. Many houses or wells may already have treatment systems in place to remove or lessen the degree of contamination and the PWTA test results do not measure if the treatment is working. Further post-treatment samples collected at a kitchen tap are recommended to evaluate the effectiveness of a treatment system.

PWTA test results are not confirmed through the collection and analysis of a second, or confirmatory sample. Questionable or unexpected results are neither confirmed nor verified by NJDEP, and have been included in the data analysis and summaries.

Although PWTA testing is more extensive than previous state regulatory requirements, the list of parameters is limited. The requirement to test for some parameters, such as arsenic and mercury, is based on regional occurrence where these parameters are known to be present in groundwater. Other types of compounds may be present in

water if the well is near specific sources of contamination. Caution must conclude that these contaminants are not present in the drinking water. about water quality may only be made for the tested parameters.

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