Drinking Water Contaminant Candidate List and Regulatory Determinations
General Information Websites
The list of websites below provides resources for general information on chemical contaminants.
Pesticide Reregistration Status
This EPA Office of Pesticide Programs provides fact sheets for pesticides in PDF form. Fact sheets include information in narrative and table form on use; health; risk (dietary, occupational, residential & ecological); and risk mitigation. Data elements include NOAEL, LOAEL, RfD, EEC, LD50, LC50 values, and critical effects for each of these. Also available are production, use and exposure assessment data.
Integrated Risk Information System (IRIS)
This EPA site presents information from chronic health hazard assessments for non-carcinogenic effects and carcinogenicity assessments for lifetime exposure. Data elements for non-cancer data include RfD and RfC values, and specify critical organs and effects, type of study, animal model used, year of study, duration of study, and so on. Data elements for cancer data include oral slope factor values, drinking water unit risk values, dose-response relationships, and cancer class.
Substance Registry System (SRS)
This EPA site provides information on substances and how they are represented in the EPA regulations and information systems. The SRS is EPA’s central system for information about regulated and monitored substances. The system provides a common basis for identification of chemicals, biological organisms, and other substances listed in EPA regulations and data systems, as well as substances of interest from other sources, such as publications. You can query for substances by common identifiers, names, or alternate identifiers.
This U.S. National Library of Medicine source provides chemical structure; chemical classification (type of chemical or use); registry number; synonyms & names; toxicity information (such as LD50 and LC50) drawn from primary literature.
ATSDR Toxicity Profiles
This U.S. Agency for Toxic Substances and Disease Registry (ATSDR) source lists toxicological profiles in PDF form for various chemicals under “Finalized Toxicological Profiles.” These profiles include health effects; chemical & physical properties; production, import/export, use and disposal information; potential for human exposure; analytical methods; and regulations & advisories for a given chemical.
Hazardous Substances Data Bank (HSDB)
This U.S. National Library of Medicine (USNLM) source includes information on human health effects; emergency medical treatment; animal toxicity studies; metabolism/pharmacokinetics; environmental fate & exposure; environmental standards and regulations; chemical/physical properties; chemical safety & handling; manufacturing/use information; analytical laboratory methods; and synonyms & identifiers for a given chemical.