Data & Databases
EPA maintains drinking water data in several databases, including the Safe Drinking Water Information System - Federal Version (SDWIS/FED) and the National Contaminant Occurrence Database (NCOD).
The agency utilizes this information to help manage environmental programs,
and provides public access to the data through the Internet.
For other water-related databases maintained by EPA see the Office of Water's databases and software page.
List of Drinking Water Databases
Safe Drinking Water Information System - Federal
SDWIS/FED is EPA's national regulatory
compliance database for the drinking water program. It includes
information on the nation's 160,000 public water systems and violations
Unregulated Contaminant Monitoring Rule (UCMR)
data generated by the UCMR to evaluate and prioritize contaminants
on the Drinking Water Contaminant Candidate List, a list of
contaminants EPA is considering for possible new drinking water
Contaminant Occurrence Database (NCOD)
NCOD was developed
to satisfy the statutory requirements set by Congress
in the 1996 Safe Drinking
Water Act (SDWA) amendments. The purpose of the database is to
support the U.S. Environmental Protection Agency's (EPA)
related to identifying contaminants for regulation and subsequent
regulation development. The NCOD contains occurrence
both Public Water Systems (PWSs) and other sources (like the
U.S. Geological Survey National Water Information System)
chemical, microbial and radiological contaminants for both detections
Information Collection Rule (ICR) Federal Database
Safe Drinking Water Information System - State
ICR database includes research data from an 18-month study of
disinfection byproducts and microbial contaminants.
SDWIS/State is a data system that EPA is developing for states that
will improve the quality of drinking water information.
Drinking Water Research Information Network (DRINK)
DRINK is a portal to information on projects funded or performed by water research organizations, government agencies in the U.S., international research organizations and academic institutions focused on drinking water issues. It is a compilation of drinking water project information from partner organizations that creates a single source of ongoing research.
Watershed Information Network (WIN)
Index of Watershed Indicators (IWI)
WIN helps people
learn about the watershed in which they live.
a compilation of information on the "health" of aquatic resources
including all watersheds in the lower 48 states.
Periodically, EPA analyzes and reports
on occurrence of certain contaminants in sources of drinking water
If you can't find the information you need through the sources above,
you may also consider filing a Freedom of Information Act
(FOIA) request for drinking water data.