National Capital Commission — federal contaminated sites

National Capital Commission is custodian of 235 sites in Canada's Federal Contaminated Sites Inventory — 1.0% of the 24,426 sites nationwide. 100 are active, 126 are closed, and 9 are suspected. Reported federal expenditure on these sites totals $38.9M (0.4% of the national total), an average of $165K per site.

Open these sites on the interactive map

Status and priority

Reported expenditure by fiscal year

Where National Capital Commission sites are located

Most common contaminant types

• Metal, metalloid, and organometallic163 · 69%
• PAHs (polycyclic aromatic hydrocarbon)116 · 49%
• PHCs (petroleum hydrocarbons)99 · 42%
• Other organics28 · 12%
• BTEXs (benzene, toluene, ethylbenzene, and xylene)27 · 11%
• Other inorganics15 · 6.4%
• Other Physical/Chemical (pH, temperature, dissolved solids, turbidity, etc.)15 · 6.4%
• Halogenated Hydrocarbon10 · 4.3%
• PCBs (Polychlorinated Biphenyl) and PCDD/Fs (polychlorinated dibenzo-p-dioxin/dibenzofuran)4 · 1.7%
• Pesticides2 · 0.9%

Most affected media

• Soil171 · 73%
• Groundwater93 · 40%
• Surface water13 · 5.5%
• Sediment5 · 2.1%
• Surface soil5 · 2.1%
• Other medium4 · 1.7%
• Air3 · 1.3%
• Not Available1 · 0.4%

Largest sites by reported expenditure

Municipalities with the most sites

Ottawa (168) · Gatineau (56) · Chelsea (7) · Pontiac (3) · La Pêche (1)

Figures are computed from the official FCSI open-data export published August 3, 2026, under the Open Government Licence – Canada. This is an unofficial site — verify against the official inventory before relying on details.