military sites across australia. at williamtown, it is also conducting studies on the uptake and residual contamination in plants, chickens and eggs. in december 2017, new zealand's minister for the environment announced that higher than acceptable levels of pfos and pfoa were found in groundwater at two royal new zealand air force bases, thought to be from historic use of firefighting foam containing the substances. residents residing near the airbases were told to drink bottled water until more extensive testing could be carried out. in 2020, state government agencies in the us are planning to dispose of firefighting foam, either by incineration or landfilling. nearly 1 million us gal (3,800 kl) of foam will be disposed by the us. the potential health risks of incinerating afff are still being investigated by epa and state agencies.