Water Quality Standards and Assessment

Water quality in Louisiana is managed under the two broad areas of surface water and groundwater. Surface water management seeks to protect the quality of all waters of the state, including rivers, streams, bayous, lakes, reservoirs, wetlands, estuaries, and many other types of surface water. The Aquifer Evaluation and Protection Unit seeks to protect the quality of all waters found in underground aquifers as well as the surface water sources of that groundwater. For more information on surface water quality data, standards, and assessment please email the Water Planning and Assessment Division.

Current Events

Public Notice of 2020 Louisiana Water Quality Inventory: Integrated Report (305(b)/303(d)) In accordance with the Louisiana Water Quality Management Plan (WQMP), 30-day notice is hereby given for solicitation of comments for the update of Volume 5: Water Quality Inventory. Updates to Volume 5 of the WQMP have been made through development of the 2020 Water Quality Integrated Report Assessments Spreadsheet and the associated Integrated Report Rationale (Rationale begins on page 65 of the linked document). The Integrated Report Rationale provides a description of the processes used in making water quality assessment and Integrated Report category determinations. The public notice period begins on May 13, 2020 and ends at 4:30 PM on June 17, 2020. The Public Notice Statement is available on the LDEQ website.

 All interested persons are invited to submit written comments for the record on the 2020 Integrated Report and Rationale. Comments must be received no later than 4:30 p.m., Wednesday, June 17, 2020.  All comments should be addressed to Mr. Albert E. Hindrichs, Louisiana Department of Environmental Quality, Office of Environmental Assessment, P.O. Box 4313, Baton Rouge, Louisiana, 70821-4313, or by E-mail at Al.Hindrichs@LA.GOV.

FINAL 2018 Louisiana Water Quality Inventory: Integrated Report (305(b)/303(d))On November 20, 2019, the 2018 Louisiana Water Quality Integrated Report was approved by EPA with six deferred actions for dissolved oxygen on six subsegments. The deferrals resulted in changing the six original assessments of full support for dissolved oxygen back to the 2016 assessments of impaired. All six assessments will be reevaluated during the 2020 IR process. The changes can be identifed in the Appendix A spreadsheet by yellow highlighting. All other portions of the report have been fully approved by EPA. The assessments contained in the report are now considered final. 

Water Quality Trading

2016 Triennial Review - Surface Water Quality Standards for Louisiana

A Long-Term Vision for Assessment, Restoration, and Protection under the Clean Water Act Section 303(d) Program

All Other Activities, Web Maps and Reports