Housing New Zealand has spent $51.9 million on decontaminating state houses of methamphetamine in just 12 months, but questions linger over whether it was necessary.

The bill was a 147 per cent increase on the $21m spent in the 2015-16 financial year – a jump Social Housing Minister Amy Adams put down to increased testing in late 2016.

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MAARTON HOLL/STUFF

The costs of cleaning up state houses showing the presence of methamphetamine are skyrocketing.

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