Most towns in the South were once surrounded by market gardens and orchards.  These activities historically used toxic persistent chemicals such as lead arsenate, DDT and other persistent pesticides. They also sometimes used heavily contaminated materials such as wool waste or leather shavings as soil amendments.

Cropped image from 1964 from the Whites Aviation Ltd Photograph Collection (Outram, Dunedin. Ref: WA-62043-F. Alexander Turnbull Library, Wellington, New Zealand. /records/23229592)