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

2020 Louisiana Water Quality Inventory: Integrated Report (305(b)/303(d)) - The public notice period for the 2020 Louisiana Water Quality Inventory: Integraged Report (305(b)/303(d)) has closed. The report is currently being finalized for submittal to EPA. It will be posted here upon finalization by LDEQ and approval by EPA. 

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