The phrase "to contaminate the land" means to make the land dirty or polluted by adding harmful substances or chemicals to it, which can be harmful to plants, animals, and people. Full definition
One of her specialties is contaminated land issues, but her thoughtful blog covers a much wider range of environmental topics, including climate change, green energy, environmental litigation and water pollution. (nimonik.ca)
Brownfields are areas of contaminated land common in older industrial communities. (wamc.org)
including, Chevron, Daiken NZ and NZ Bus on contaminated land matters including regional consenting programmes, remedial works and enforcement matters (buddlefindlay.com)