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 Water Quality Contact.
A Long-Term Vision for Assessment, Restoration, and Protection under the Clean Water Act Section 303(d) Program
FINAL 2014 Louisiana Water Quality Inventory: Integrated Report (305(b)/303(d)) - On July 21, 2015, the 2014 Louisiana Water Quality Inventory: Integrated Report (305(b)/303(d)) was approved by EPA with Integrated Report Category revisions on 43 subsegments. The assessments contained in the report are now considered final.
All Other Activities and Reports
Water Quality Management Plan/Continuing Planning Process
Nutrient Management Strategy - Learn more about what Louisiana is doing to manage nutrients in state surface waters.
Water Quality Regulations and Standards - Louisiana's Water Quality Regulations can be found at this link. Look for Part IX: Water Quality in the table entitled ERC (LAC Title 33). Chapter 11 of Part IX provides all water quality standards (designated uses and criteria) for Louisiana.
Dissolved Oxygen Criteria Use Attainability Analysis in the Barataria and Terrebonne Basins
Dissolved Oxygen Criteria Use Attainability Analysis in the Eastern Lower Mississippi River Alluvial Plains Ecoregion and Proposed Updates to Volume 4 of the Water Quality Management Plan
Ambient Surface Water Quality Monitoring Data - Surface water quality data collected routinely by LDEQ at locations throughout the state.
Quality Assurance Project Plan for the Ambient Surface Water Quality Monitoring Network (QAPP_1004_R08)
Water Quality Assessments - Louisiana Water Quality Inventory: Integrated Report (305(b)/303(d)) - Surface water assessments to determine needs for protection and improvement of water quality. Reports from 1996 through the final DRAFT 2014 are available.
Total Maximum Daily Load (TMDL) Program
Water Quality Inspections Home Page - LDEQ's Inspections Division conducts ambient surface water monitoring.
Geographic Information System - Provides mapping information for Louisiana's water bodies, monitoring sites, and more.
Louisiana's Fishing and Swimming Advisories - Fish consumption and swimming advisories issued jointly by the Louisiana Department of Health and Hospitals and LDEQ.
DEQ Mercury Initiative - LDEQ's program to reduce and where possible eliminate mercury releases to the environment.
Water Quality Educational Resources