Hon DAVID PARKER: Those are the sorts of issues that I'm taking advice on, but I would note that there's already a lot in the National Policy Statement on Freshwater Management relating to excessive nitrogen contamination, including requirements that council plans prevent further decline of the water quality or ecosystem health, direct management of nitrogen concentrations in rivers to 2.4 milligram per litre or less of nitrate, setting specific targets for dissolved inorganic nitrogen and phosphorous in rivers to ensure that bottom lines are met, and to achieve health in the macroinvertebrate index.