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.

Stressors 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.

EPA has compiled state, territorial, and authorized tribal water quality standards that EPA has approved or are otherwise in effect for Clean Water Act purposes. This compilation is continuously updated as EPA approves new or revised WQS.Please note the water quality standards may contain additional provisions outside the scope of the Clean Water Act, its implementing federal regulations, or EPA's authority. In some cases, these additional provisions have been included as supplementary information. EPA is posting the water quality standards as a convenience to users and has made a reasonable effort to assure their accuracy. Additionally, EPA has made a reasonable effort to identify parts of the standards that are approved, disapproved, or are otherwise not in effect for Clean Water Act purposes.

Identifies the state and EPA water designated use information and the use attainment status for assessed waters under the Clean Water Act 305(b) program.

Identifies the sources of impairment for assessed waters under the Clean Water Act 305(b) program. This view can be used for viewing the details at the assessment unit level.

Identifies assessed waters under the Clean Water Act 305(b) program.

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

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