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
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