Sources of nitrogen and phosphorus are controlled using best management practices for non-point sources and treatment technologies for point sources. EPA has collected information about BMPs and treatment for use by states in determining how nitrogen and phosphorus can be controlled.

EPA Data

• Biological nutrient removal
  Information on eight BNR processes from 66 facilities designed to lower Total Nitrogen and Total Phosphorus.
• Advanced Wastewater Treatment to Achieve Low Concentration of Phosphorus
  Information on 15 filtration technologies installed at 23 municipalities in the U.S.

External Data

• Water Environment Resource Foundation (WERF) Stormwater BMP Database Search Exit
  Performance data and percent effectiveness reduction for over seven types of BMPs (over 100 BMPs total)