Im looking for a underground tank of about 25,000 to 30,000 litres.
Anyone knows where I can get one?

roto tanks http://www.rotomoulders.com/septinfo.php
simtanks http://www.silafrica.com/simtank
Kentanks http://www.ramco-group.com/kentainers
poly tanks http://www.polytankskenya.com/
zentanks http://www.zentank.co.ke/[/quote]

Hi thanks. But none of those have underground tanks of more than 6,000 litres for sale

Some guy has built one in Kite abt 20,000 capacity. He is also able to tap rain water into the same tank...maybe they can make according to your spec..Roto tank

@Kamundu, Alternatively, you can do an underground stone water tank and have the volumes you need at the same cost as a plastic tank. The stone one would last longer if well done and water always cool.

In high density urban areas without trunk sewers, water table is quite high thanks to effluent from neighbouring septic tanks.

As such some masonry underground water tanks are always full i.e. ground water seeping into the tank through invisible joints on tank walling due to pressure.

Perhaps this would explain why @And1589 would rather you installed a plastic tank inside a pit with masonry walling…