1997 February: Fish Kill Southport Qld. Pesticide: Chlorpyrifos

No further incidents in the Gold Coast area were reported to Dow until a fish kill in Koorong Street drain at Southport in February 1997. Water upstream of the weir contained 1.2 μg/L chlorpyrifos. The most likely cause was thought to be an under slab treatment, where the pouring of the concrete slab was delayed for 6 days by rain. Dow responded by communicating the sequence of events to all under slab applicators in the Gold Coast and Brisbane areas.
 
https://apvma.gov.au/sites/default/files/publication/14756-chlorpyrifos-irr-environment.pdf
No further incidents in the Gold Coast area were reported to Dow until a fish kill in
Koorong Street drain at Southport in February 1997. Water upstream of the weir
contained 1.2 μg/L chlorpyrifos. The most likely cause was thought to be an under
slab treatment, where the pouring of the concrete slab was delayed for 6 days by rain.
Dow responded by communicating the sequence of events to all under slab applicators
in the Gold Coast and Brisbane areas.
https://apvma.gov.au/sites/default/files/publication/14756-chlorpyrifos-irr-environment.pdf