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A Review of Contaminant Occurrence in Public Water Systems EPA 816-R-99-006 This study represents the Environmental Protection Agency's (EPA's) most extensive analysis to date of the occurrence of contaminants in Public Water Systems (PWSs) regulated under the Safe Drinking Water Act (SDWA). EPA's Office of Ground Water and Drinking Water conducted this study to provide a better scientific basis for considering changes to the chemical monitoring requirements in the drinking water program. Main Report (363KB, PDF) Appendix A. Summary Tables of Contaminant Occurrence Data State databases, comprised of SDWA compliance-monitoring data from PWSs, were the primary data sources for this analysis. Data from 12 states were analyzed in detail. Data from 8 States were used to develop a national cross-section of contaminant occurrence. The States were selected to represent the national range of hydrologic regimes and pollution potential. The data used represent more than 10.7 million analytical results from nearly 26,000 PWSs. More than 70% of the data are from 1993 or later; reflecting the beginning of the Phase II/V requirements. Additional sources of national data were also used, such as: EPA's Unregulated
Contaminant Monitoring Information System (URCIS), which includes data
from 40 States and territories from the first round of unregulated contaminant
monitoring; and U.S. Geological Survey studies of ambient monitoring,
including results from the National Water Quality
Assessment Program Related Links:
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