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 Data and e-Services
Links to water quality data and e-Services
Potential Funding for Watershed Improvement
Funding to help communities restore and protect impaired or threatened waters
Public Notices
Provide input on draft permits, plans or rules on public notice
Document Search
Search all department documents in one location for easy access
Laws, Rules and Regulations
State and federal rules governing water; rules in development