
PLANNING AND PERMITS
Updated Regulated Area Mapping
In November 2025, updated natural hazards regulation mapping was endorsed by the Central Lake Ontario Conservation Authority's (CLOCA's) Board of Directors following a period of public notification.
Mapping of areas that could be unsafe for people and property in the event of a flooding or erosion emergency across the watershed is a mandatory service that CLOCA provides in accordance with provincial regulations.
The mapping conceptually shows areas associated within hazardous lands including valleylands, wetlands, watercourses, and other areas that could be subject to flooding and erosion hazards, including the Lake Ontario Shoreline.
The mapping is based on provincial statutory requirements and technical information such as flood and erosion studies prepared by professional engineers and geographic information associated with wetlands, watercourses and topography prepared by other environmental specialists.
(This information is provided pursuant to clause 4 (2) (c) of Ontario Regulation 41/24.)

A key map detailing the Regulated Area Mapping separated into 28 smaller areas.
-
Sheet 4 – Southeast and Shoreline Whitby – Southwest and Shoreline, Oshawa
-
Sheet 5 – Townline Road South, Oshawa – Darlington Park and Shoreline, Clarington
-
Sheet 14 – Brooklin, Whitby – Windfield Farms Northwest Oshawa
-
Sheet 15 – Winchester, Conlin and Taunton Roads East Oshawa – Townline Road North, Clarington
-
Sheet 18 – Darlington-Clarke Townline Road – Concession Road 4, Clarington
-
Sheet 20 – Myrtle North, Whitby – Raglan and Columbus North, Oshawa
-
Sheet 21 – Howden Road East and Columbus Road East, Oshawa – Enfield Road, Clarington
-
Sheet 23 – Tyrone – Darlington-Clarke Townline Road, Clarington
-
Sheet 24 – Lake Ridge Road, Uxbridge – Middle March Road, Scugog
-
Sheet 27 – Regional Road 57 and Regional Road 20, Clarington
-
Sheet 28 – Regional Road 20 and Liberty Street – Darlington-Clarke Townline Road, Clarington
