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. 

• 2006 Drinking Water Data Reliability Analysis and Action Plan PDF (56pp, 1M)
  EPA 816-R-07-010 March 2008
• 2003 Data Analysis and Action Plan PDF (46pp, 314 K)
  EPA 816-R-03-021 March 2004
• 2000 Data Reliability Analysis Report PDF (41pp, 125K)
  EPA 816-R-03-021 October 2000

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