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Data Reliability Analysis of the EPA Safe Drinking Water Information System / Federal Version (SDWIS/FED)

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EPA routinely evaluates state drinking water programs by conducting data verification audits, which evaluate state compliance decisions and reporting to SDWIS/FED.  Every three years, the agency prepares summary evaluations based on the data verification.  The documents below represent the results EPA’s three reviews of data quality. 

Periodically, EPA analyzes and reports on occurrence of certain contaminants in sources of drinking water.
A Review of Contaminant Occurrence in Public Water Systems
EPA 816-R-99-006 November 1999

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