A lot of miss-information about water storage tanks for fire prone areas like it must be above ground or it has to be a steel or concrete tank.
TRUTH is underground tanks are fine including poly tanks however all above ground exposed fittings must be Metal.
The tank should be designed with a designated fire authority approved outlet for fire fighting purposes & accessible to a fire truck.
A clear space of at least 1.5 metres should be maintained around the tank and its outlets
The advantage of underground is significant in that its not directly exposed to fire protected by the earth.
Australia’s wide brown land deserves a better solution than tank designs from the Northern Hemisphere so Tankless introduced a proven permeable filtered surface that captures storm water & surface water to maximise catchment in a rain event so you have more water when you need it most to protect your property. With its triple liner of Bentonite clay liner ,Dam liner & Geo fabric Tankless will withstand earthquakes or soil movement to last indefinitely.
Being cost effective & its modular go anywhere design is an attractive alternative.