About this site

The Federal Contaminated Sites Explorer is an independent, open-source interface to Canada's Federal Contaminated Sites Inventory (FCSI) — the Treasury Board of Canada Secretariat's public record of contaminated and formerly contaminated sites on federally owned or leased land.

What this site is — and is not

This is an unofficial tool. It is not affiliated with, operated by, or endorsed by the Government of Canada or the Treasury Board of Canada Secretariat. The official inventory is published at the Government of Canada's FCSI site, and that source is always authoritative. This site exists because the underlying open data is valuable to environmental consultants, remediation contractors, researchers, journalists, and the public — and deserves a fast, filterable, map-first interface.

What you can do here

• Explore all 24,426 sites (23,502 of them geolocated) on a clustered interactive map, in English or French.
• Filter by status, classification, custodian department, province or territory, contaminant type, and FCSAP funding.
• Open any site for its classification, contaminants and affected media, management strategy, nearby population, and a 33-year federal expenditure history.
• Export any filtered result set to CSV.
• Browse summaries by province and territory or by custodian department.

Data source and licence

All inventory data comes from the Government of Canada's official FCSI open-data export and is reproduced under the Open Government Licence – Canada. The upstream export is checked weekly; this copy was published by the Government of Canada on August 3, 2026. See the methodology page for how the data is processed.

Accuracy

Data is presented as-is, as reported by custodian departments to the inventory, and has not been independently validated. It may contain errors or be out of date. Always confirm details against the official FCSI before relying on them for professional, legal, or property decisions.

Contact

The project is developed in the open. Questions, corrections, and suggestions are welcome through the project's GitHub repository.