SDWIS/State is a data system that EPA is developing for states that will improve the quality of drinking water information.

The Safe Drinking Water Information System (SDWIS) contains information about public water systems and their violations of EPA's drinking water regulations.

The Safe Drinking Water Information System (SDWIS) contains information about public water systems and their violations of EPA's drinking water regulations.

A database where EPA has compiled data on public drinking water systems and whether they have certain drinking water violations. This data is collected by the states and given to the EPA. This dataset is associated with the following publication: Pennino, M., J. Compton, and S. Leibowitz. Trends in Drinking Water Nitrate Violations Across the United States. ENVIRONMENTAL SCIENCE & TECHNOLOGY. American Chemical Society, Washington, DC, USA, 13450-13460, (2017).

A database where EPA has compiled data on public drinking water systems and whether they have certain drinking water violations. This data is collected by the states and given to the EPA. This dataset is associated with the following publication: Pennino, M., J. Compton, and S. Leibowitz. Trends in Drinking Water Nitrate Violations Across the United States. ENVIRONMENTAL SCIENCE & TECHNOLOGY. American Chemical Society, Washington, DC, USA, 13450-13460, (2017).

This dataset is made up of seven separate reports from the U.S. Environmental Protection Agency's (USEPA) Safe Drinking Water Information System (SDWIS). Site visits were queried using SDWIS to produce the seven summary reports, one for each year of data from January 1, 2010 to December 31, 2017. This date range was chosen to account for the effects of the Long Term 2 Enhanced Surface Water Treatment Rule (LT2ESWTR) and the Stage 2 Disinfectants and Disinfection Byproducts Rule (DBPR), both of which first became effective in 2009. The information is stored in .csv tables with a record (row) for each sanitary survey, with columns containing water system identifiers (e.g., water system ID, name, state), survey dates, findings arranged by survey element, and a comment field. Each record contains survey findings in separate fields for each survey element, and more than 95% of the fields are populated. Citation information for this dataset can be found in Data.gov's References section.

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 of drinking water regulations. Access aggregated information on all violations reported in an EPA region, state, and county since 1993 using the MS Excel PivotTables. These multidimensional tables contain aggregated information on water systems; violations reported by violation type and by contaminant/rule, and GPRA data, for each year since 1993; and current Envirofacts data. Sort, categorize, and analyze the data across several dimensions.

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 of drinking water regulations. Access aggregated information on all violations reported in an EPA region, state, and county since 1993 using the MS Excel PivotTables. These multidimensional tables contain aggregated information on water systems; violations reported by violation type and by contaminant/rule, and GPRA data, for each year since 1993; and current Envirofacts data. Sort, categorize, and analyze the data across several dimensions.

Designated uses assessed by statewide statistical surveys and their state and national attainment categories. Statewide statistical surveys are water quality assessments designed to yield unbiased estimates of the condition of a whole resource (such as all lakes or streams in a state) based on monitoring a representative sample of those waters.

Designated uses assessed by statewide statistical surveys and their state and national attainment categories. Statewide statistical surveys are water quality assessments designed to yield unbiased estimates of the condition of a whole resource (such as all lakes or streams in a state) based on monitoring a representative sample of those waters.