The Pesticide in Water Calculator (PWC) is a water model used by OPP to estimate pesticide concentrations in water bodies that result from pesticide applications to land.You may need Adobe Reader to view files on this page. See EPA’s About PDF page to learn more.
Pesticide in Water Calculator Version 1.50 User Manual (PDF)(23 pp, 596 K,
December 8, 2015)
The Pesticide in Water Calculator (PWC) estimates pesticide concentrations in water bodies that result from pesticide applications to land. The PWC is designed as a regulatory tool for users in the USEPA Office of Pesticide Programs and the Pest Management Regulatory Agency of Health Canada. The PWC contains a graphical user interface shell, the Pesticide Root Zone Model (PRZM version 5.02), and the Variable Volume Water Model (VVWM version 1.02).