Phosphorus Reduction & Tracking

STP Calculator

Stormwater Treatment Practice (STP) Calculator  This online tool allows the user to calculate estimated annual average phosphorus load and reductions associated with a stormwater treatment practice.  Please refer to the STP Calculator Instructions for the limitations of this tool. 

Phosphorus Control Plan Planning

Draft BMP Tracking Table

Standard Operating Procedures for Tracking & Accounting of Developed Lands (6/28/2022) describes methods for phosphorus accounting from structural stormwater treatment practices, non-structural treatment practices such as street sweeping, and municpal and state roads. 


Clean Water Initiative Program (CWIP)

State-wide Phosphorus Tracking and Reporting


WSMD - Stormwater Home