Knowing and measuring the quality of water can be challenging and involves three key components: developing water quality standards, identification of water bodies that are meeting and not meeting those standards (impaired waters), and developing a plan for how to return the impaired water bodies to compliance with water quality standards.

Water Quality Standards
Regulations describe how water bodies' desired conditions will be protected or achieved
Impaired Waters
Water bodies that are not meeting Water Quality Standards
Total Maximum Daily Loads
Learn how we help protect Missouri's water quality
Water Quality Data Sources
Find links to sources of water quality data
Impaired Waters and Funding for Watershed Improvement
Nonpoint source causes the majority of water quality impairments in the state
Public Notices
Find public notices and public participation opportunities here
Document Search
Search water related documents in one location for easy access