Simple steps to minimise the effects of chemical contamination on water quality and mahinga kai.

  • Use low-toxicity herbicides adjacent to waterways.
  • Minimise the need for pesticide applications by applying them only when needed, at times when they are most likely to be effective, and in recommended concentrations.
  • Use, wherever possible, new-generation chemicals that have a high degree of target specificity, have low persistence in the environment, and are less inclined to be leached to groundwater or carried in surface runoff.
  • Apply chemicals in conditions and with equipment that prevent spray drift and coverage of non-target plants and waterways.
  • Avoid applying chemicals immediately prior to rain.
  • Investigate alternative methods to the use of herbicides for the control of weeds and unwanted grass.
  • Reduce contaminants from entering waterways by planting riparian margins and maintaining and incorporating vegetated swales and constructed wetlands.
  • Contain wastewaters carrying chemical preservatives as part of wood treatment within a closed loop application system.
  • Prevent leaching of contaminated waters into the soil and groundwater.
  • Line and waterproof storage areas and treatment areas (including agri-chemicals, timber processing yards, and meat and dairy processing facilities).
  • Recycle chemicals.

You can find out about industry or land use specific mitigation options on the corresponding activity or industry page

Research subject: Water Quality