Insurance policy.

Storms caused the most damage.

Storms, fires, lightning, thieves and overflowing sewage helped push the government's property insurance payouts to $10.9 million in the past year.

Figures from the ACT Insurance Authority show storms caused the most damage after they left repair bills worth $9 million across Canberra while fires accounted for $1.3 million and machinery damage cost $255,000.

Three sewage problems at Canberra Hospital racked up $137,000 in insurance claims, one of which involved a toilet overflow over two levels of building one of the hospital. It meant medical supplies in a storeroom had to be replaced.

Another overflow blocked access to part of building five of the hospital campus for a few days, which required training sessions to be held at other locations.

Meanwhile, five thefts created insurance claims worth $38,434 and five lightning strikes caused $32,871 of damage.

Two of the lightning strikes hit irrigation systems, one in Gungahlin and the other in Tuggeranong.

The figures take in much of last year, which was a below average year for rainy days.