Orange County Stormwater Tools


This website is not intended as a full inventory of facilities and O & M activities. It is not intended as a standalone basis to assess compliance. Jurisdictions may have records and utilize data systems that are not connected to this site.

Start here to view, edit, assess, or maintain a BMP
View a list of all Water Quality Management Plans.
See details of the 26 different types of BMPs

About the OC Stormwater Tools

The OC Stormwater Tools platform was developed as a collaborative effort of Orange County Public Works, MS4 Permittees, and other organizations within the South Orange County Watershed Management Area. The platform consists of three modules, plus workflows to support delineations. 



The Inventory Module is used to inventory water quality BMP assets, assess BMP conditions, and track maintenance activities. It also allows the user to define delineations and populate modeling attributes of BMPs and WQMP sites.

The Trash Module helps MS4 Permittees track compliance with the California Statewide Trash Amendments. This module is a calculation engine that brings together asset information with other GIS resources to provide up-to-date quantifications regarding progress. Progress can be viewed in multiple ways, including area-based (PLU acres), load-based (gallons per year), and OVTA (acreage of full capture equivalent).

The Modeling Module includes a calculation engine to quantify pollutant load reduction and other benefits of BMPs. This module calculates the long-term water balance and pollutant load reduction associated with inventoried BMPs. 

Participating Jurisdictions

The Orange County Stormwater Tools website is designed to support stormwater management tracking and decision making for the County of Orange and Copermittee Cities. Click the map to see jurisdiction details.