New to CAST?

CAST is an environmental planning resource designed for those protecting and restoring local water quality and the Chesapeake Bay. Register to create and edit scenarios for reducing nitrogen, phosphorus, and sediment using various best management practices (BMPs), learn more about the additional ecosystem benefits (co-benefits) of those BMPs, gain access to additional tools and data, and receive CAST's monthly newsletter.

CAST will be taken offline for updates on Monday, June 10th at 12:00pm EDT. These updates are expected to take about an hour. We apologize for the inconvenience.

Did you know about the Ecosystem Benefits Browser, an interactive tool that visualizes and summarizes the goals, outcomes, and co-benefits associated with CAST BMPs?

Ecosystem Benefits Browser


Develop A Plan

Get answers to your questions about how to use CAST to develop a plan.

Source Data

Download data tables including information on load sources and agencies, BMPs, animals, geographic references and delivery factors.


View information on best management practices (BMPs) including calculations, a quick reference guide, and protocol and expert panel reports.


View maps and graphs of monitored water quality data.

Mapping Tools

View geographical information and shapefiles.


Download BMP costs data and view cost profiles for each state and Chesapeake Bay Watershed.

Track Progress

View helpful information on verification, river trends, how to submit progress data via NEIEN, and modeling Federal facilities.

Ecosystem Benefits

Get information about the complementary benefits to BMP implementation.