Six-Year Review Contaminant Occurrence Data

The Safe Drinking Water Act (SDWA) requires EPA to review each National Primary Drinking Water Regulation (NPDWR) at least once every six years and revise them, if appropriate. The purpose of the review, called the Six-Year Review, is to identify those NPDWRs for which current health effects assessments, changes in technology, and/or other factors provide a health or technical basis to support a regulatory revision that will maintain or strengthen public health protection. To support the national contaminant occurrence and exposure assessments performed under the Six-Year Review process, EPA analyzes SDWA compliance monitoring data from public water supplies for regulated drinking water contaminants. This analysis allows EPA to characterize the national occurrence of contaminants to help the Agency determine if there may be a meaningful opportunity to improve public health protection.

Data and Resources

This dataset has no data

Field Value
accessLevel public
accrualPeriodicity irregular
bureauCode {020:00}
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catalog_@id https://edg.epa.gov/data/public/OW/metadata/OW.json
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identifier {616538BA-B7B5-4D4E-B1F8-A5A441F275D1}
issued 2014-01-01
license https://edg.epa.gov/EPA_Data_License.html
modified 2010-03-01
old-spatial -180.0,18.0,-66.0,72.0
programCode {020:072}
publisher U.S. EPA Office of Water (OW) - Office of Ground Water and Drinking Water (OGWDW)
references {https://edg.epa.gov/metadata/catalog/search/resource/details.page?uuid=%7B616538BA-B7B5-4D4E-B1F8-A5A441F275D1%7D,https://edg.epa.gov/metadata/rest/document?id=%7B616538BA-B7B5-4D4E-B1F8-A5A441F275D1%7D}
resource-type Dataset
source_datajson_identifier true
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source_schema_version 1.1
spatial {"type": "Polygon", "coordinates": [[[-180.0, 18.0], [-180.0, 72.0], [-66.0, 72.0], [-66.0, 18.0], [-180.0, 18.0]]]}
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • AmeriGEO
  • AmeriGEOSS
  • CKAN
  • GEO
  • GEOSS
  • National
  • North America
  • United States
  • contaminants
  • drinking-water
  • environment
  • health
  • human-health
  • npdwr
  • pollution
  • public-water-systems
  • sdwa
  • six-year-review
  • united-states
isopen False
license_id other-license-specified
license_title other-license-specified
maintainer Safe Drinking Water Hotline, U.S. EPA Office of Water (OW) - Office of Ground Water and Drinking Water (OGWDW)
maintainer_email safewater@epa.gov
metadata_created 2025-09-23T14:46:02.611435
metadata_modified 2025-09-23T14:46:02.611441
notes The Safe Drinking Water Act (SDWA) requires EPA to review each National Primary Drinking Water Regulation (NPDWR) at least once every six years and revise them, if appropriate. The purpose of the review, called the Six-Year Review, is to identify those NPDWRs for which current health effects assessments, changes in technology, and/or other factors provide a health or technical basis to support a regulatory revision that will maintain or strengthen public health protection. To support the national contaminant occurrence and exposure assessments performed under the Six-Year Review process, EPA analyzes SDWA compliance monitoring data from public water supplies for regulated drinking water contaminants. This analysis allows EPA to characterize the national occurrence of contaminants to help the Agency determine if there may be a meaningful opportunity to improve public health protection.
num_resources 0
num_tags 19
title Six-Year Review Contaminant Occurrence Data