Housing NZ has spent $5.8 million so far this year testing and cleaning up state houses contaminated with methamphetamine, and more than half of that has been in Auckland.
The figure released under the Official Information Act shows a rise in the amount spent on decontaminating state houses in the seven months to January compared with previous financial years.
The total amount spent on detecting and cleaning up so-called P houses for 2014/15 was $2.317 million and $711,106 in 2013/14.
Auckland has the biggest issue, with $3.1 million being spent on houses there, followed by $1.01 million in Manawatu/Taranaki/Wairarapa and $357,170 in Christchurch/Nelson/Marlborough.
The least money - $95,423 - was spent on Southland houses.