A man, named locally as Ryan Cleary, 19, has been arrested in Wickford, Essex. Police have not identified him.
On Monday the UK's Serious Organised Crime Agency (Soca) took its website offline after it was attacked by Lulz Security hackers.
Scotland Yard said the raid followed a series of distributed denial of service (DDoS) attacks.
Channel 4 News claimed LulzSec may have succeeded in hacking into the database of the 2011 Census, which holds details of every UK citizen who filled out the survey earlier this year.
But the Office for National Statistics has released a statement saying: "We are aware of the suggestion that Census data has been accessed. We are working with our security advisers and contractors to establish whether there is any substance to this.
"The 2011 Census placed the highest priority on maintaining the security of personal data. At this stage we have no evidence to suggest that such a compromise has taken place."
When Lulz Security, or LulzSec, first appeared in May, the group portrayed itself as a light-hearted organisation, bent on creating online fun and Lulz (laughs).
But LulzSec is said to have been planning to establish itself as a rival to Anonymous, the hacking group embroiled in the WikiLeaks fallout.
LulzSec initially targeted US broadcasters PBS and Fox and gaming firms.
But the Twitter page @LulzSec then declared its intention to break into government websites and leak confidential documents.
is also suspected of hacking into CIA, Sony and NHS websites and malaysian goverment website earlier this months.
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