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Water: Water Quality Standards

Disclaimer

out of date Note: EPA no longer updates this information, but it may be useful as a reference or resource.

This is the final release of the WQSDB—it will not be updated. (For future plans, see the Release 9 Fact Sheet.) You can see the WQS documents upon which the WQSDB information was based and access state WQS program webpages. You are also able to download pre-formatted reports, and copies of the database.

If you have any questions, please contact us.

The US EPA Office of Water, Office of Science and Technology maintains the files on this website to enhance public access to information. While we try to keep the information timely and accurate, we make no expressed or implied guarantees. We will attempt to correct any errors brought to our attention.

The information contained on these pages is intended to inform the public and does not establish or affect legal rights or obligations. This applies to all pages in the Water Quality Standards Database (WQSDB). Agency decisions in any particular case will be made by applying the law and regulations to the specific facts of the case. In addition, because EPA cannot guarantee protection from potential alteration or tampering of the materials on this server by outside parties, these materials do not constitute "official" versions, and they are not intended, nor can they be relied upon, to create any rights enforceable by any party in litigation with the U.S.

Links to non-EPA sites do not imply any official EPA endorsement of, or responsibility for, the opinions, ideas, data or products presented at those locations, or guarantee the validity of the information provided. Links to non-EPA servers are provided solely as a pointer to information on topics related to environmental protection that may be useful to EPA staff and the public.

Reference to any specific commercial products, process or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the U.S. Government and shall not be used for advertising or product endorsement purposes.

Each State's Water Quality Standards are applicable to "waters of the State". In some limited instances, the definition adopted by each State for "waters of the State" as part of its water quality standards may result in water quality standards that are more comprehensive than required under section 303(c) of the Clean Water Act and the implementing federal regulations. EPA has included the State's water quality standards in their entirety within this WQSDB website for context and as supplementary information for the reader.

Each State's Water Quality Standards apply to all waters within that State, with the exception of those waters that are within Indian country, as defined in 18 U.S.C. Section 1151. EPA's approval of each State's Water Quality Standards was not intended as an action to approve or disapprove water quality standards applying to waters within Indian country. EPA, or eligible Indian tribes, as appropriate, will retain responsibilities for water quality standards within Indian country.

Different dates may exist for different Water Quality Standards activities and sources reported on this site. View a listing of dates for when Reach Indexing (mapping) was conducted, the date of reported criteria, the EPA Repository WQS Effective Date, and the DUS-EPA Effective Date.

State-Specific Disclaimers

Some state-specific disclaimers apply to data and information associated with that state in the WQSDB.

Reach Indexing

Map of data available for the USA

The map shows states available for query and display through EnviroMapper. Some states have maps which portray their information in more detail. More detailed maps will be used on the EnviroMapper site as they become available. Note: Pink states have preliminary designated use information available on the Intranet and may also have preliminary mapping information available on the Intranet (This map is not clickable).

Different dates may exist for different Water Quality Standards activities and sources reported on this site. View a listing of dates for when Reach Indexing (mapping) was conducted, the date of reported criteria, the EPA Repository WQS Effective Date, and the DUS-EPA Effective Date.

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