"Rainwater collection in Singapore is no longer illegal, unless you're in the designated catchment areas. So the greater issue now is not the collection, but mosquito breeding - which, if we follow the recent news, is set to become an area of even greater focus by the authorities, given the continuing climb in diseases spread by the mosquito as a vector. " and " I have NEA officers came to my place before and I also have several huge barrels of rainwater stored and covered. They are okay with it. Collecting and using rainwater is good. All part and parcel of water conservation. Just make sure they do not become mozzie breeding grounds! " by mm and Mejo suggest that collecting rainwater is legal provided that mosquitoes are not breeding and they are a discussion from 2009..

for the another website "It was recently published in the Straits Times that it will be ILLEGAL for Singaporeans to collect RAINWATER for the purpose of washing cars, gardening, and washing.

The reason given was that any “Private” actions in collecting rainwater will deprive that amount from the National Pool that can put all rainwater to more effective use.

It was not mentioned in the Straits Times report if the law is effective immediately, or if it is soon to be introduced for debate prior to legislation." this is from 2002 so not sure whether it is still effective as it is 10 years back.