WATER EPI Lab Drinking Water Repository

The WATER EPI Lab Drinking Water Repository is a collection of datasets containing regulated contaminant concentration estimates in community water systems across the US, made available for both researchers and the public. Contaminant concentrations are derived from millions of routine compliance monitoring records reported by community water systems to primacy agencies. These concentration estimates are designed for use in exposure assessment and epidemiologic analyses. Estimates (1) are aggregated to time periods reflecting the US Environmental Protection Agency's standardized monitoring requirements (to reduce differential missingness and bias), (2) reflect concentrations distributed to consumers in finished ("treated") water, and (3) are aggregated to multiple spatial geographies (water systems, Census tracts, ZCTAs, counties) and vintages to facilitate linkage with a wide variety of location formats.