Mapping and Data

Conservation Halton (CH) takes an active role in accurately mapping hazard and environment related information and providing data services through the Geographic Information Systems Program (GISP). This enables information to be shared with both government and non-government agencies.

The GISP partners with both internal and external clients to maintain authoritative GIS datasets. This information can be provided in the form of analysis summaries, project services, maps and GIS data layers that support a wide variety of watershed activities including planning and permit review and restoration of sensitive natural heritage areas. 

Online Mapping

Planning & Permits

Conservation Halton’s online mapping tool is designed to provide landowners (and potential landowners) a view into regulations or policy designations that may be relevant to their property.  Proximity to legislative areas, specific environmental features, or the Approximate Regulation Limit (ARL) can affect land uses; this tool allows users to view these aspects in a single location with ease.  Click the link in the right hand navigation bar, or click here to go to Planning & Permits online mapping.


If your property is within areas regulated by Conservation Halton under Ontario Regulation 162/06 and you want to do any construction or development on or adjacent to a regulated area, interfere with a wetland, or alter a creek, stream or watercourse), you will need a permit.

This is in addition to a building permit or other approvals from your municipality. Go to our Permits page for more information on how to apply for a permit.

It is always best to contact Conservation Halton first to confirm if you do require a permit. You can send an e-mail to or call 905-336-1158,

  • Milton, Puslinch and Mississauga: Ben Davis, ext. 2278
  • Oakville and Halton Hills: Laura Head, ext. 2333
  • Burlington and Hamilton: Cassandra Connolly, ext. 2301
  • Properties on the Lake Ontario Shoreline: Charles Priddle, ext. 2276
  • General Inquiries: Michelle Caissie, ext. 2227

Disclaimer: The text of the Regulation takes precedence over the Approximate Regulation Limit. Some regulated features may not appear on the Approximate Regulation Limit mapping. This mapping should be used for information purposes only. The data displayed are derived from sources with different accuracies and all boundaries should therefore be considered approximate. Data on this map is used under license and is protected by copyright for different organizations, including but not limited to Teranet Enterprises Inc. and other agencies.

GIS Data

To obtain digital GIS data from Conservation Halton, we ask that fill out an submit our Digital Information Request Form to list specific data sets that you wish to request from the Conservation Authority. Once completed this form is used by staff to complete a Data Sharing Agreement (DLA) for your signature that will describe the data requested and any fees that will be applied to complete your request. Once a DLA is signed staff will begin work on your request. If a fee is applicable, this must be paid before the data is released.

Our digital Data Holdings and Availability document will assist you in determining what data is available from Conservation Halton, and information on where to go for "third party datasets" (data Conservation Halton cannot provide due to licensing restrictions). Our fee schedule is also described in this document. 

The Data Dissemination Policy is an overview of data distribution at Conservation Halton and briefly describes the "Groups" subject to fees. Any fees recovered under this policy contribute to funding the update of GIS data and maps provided to the public. 

Typically requests are processed within a few days of receipt of the signed DLA, however, workloads and the size of your data request will have an impact on timelines. Staff will provide you with an anticipated delivery date.


Custom mapping products can be obtained by filling out the Request Custom Mapping (PDF) form and submitting it to  Cost recovery fees are charged for this service.