A section of ceiling has collapsed at Perth's new children's hospital on Tuesday in the latest drama to befall the site, whose opening is nearly a year overdue.
No one was injured in the incident, which an employee at the site told WAtoday had happened around 2pm.
More News Videos
Perth Children's Hospital flythrough
Take a tour of what the Perth Children's Hospital will look like.
"Workers were working on the ground floor when the ceiling fell down from the ninth floor," he said.
"Everything is on the floor... and they closed that side of the building."
Builder John Holland issued a statement saying a small section of plasterboard ceiling became dislodged, it was believed after being damaged by water during severe weather on Sunday night.
"John Holland inspected the hospital building on Monday morning and had set up a number of small exclusion zones where water ingress was sighted. The plasterboard fell from an area where water damage occurred," it said.
"Earlier today, an industrial hygienist had conducted tests to also check for any other areas of water damage beyond what could be seen. Results of these tests are pending. All appropriate safety regulators have been notified and exclusion zones remain in place."
The news comes a fortnight after lead was discovered in the drinking water and two months after asbestos was found in roof panels at the site.
![Yet another safety issue has arisen at the new hospital.](/web/20160922013329im_/http://www.watoday.com.au/content/dam/images/g/q/8/9/o/e/image.related.articleLeadwide.620x349.grkide.png/1474372839364.jpg)
John Holland was quick to rule out its taps and valves as the source of the lead and stated that the water was sourced via a line from the nearby QE11 Medical Centre.
Premier Colin Barnett last week told media the source was traced as external to the hospital but the Water Corporation said the water came from Mount Eliza Reservoir, which was annually tested for lead. A spokeswoman also said the Water Corp infrastructure did not contain any lead fixtures or fittings.
Treasurer Mike Nahan, responsible for the project, has confirmed only that an "intensive, systematic investigation" of the drinking water is in its final stages.
John Holland has been providing bottled water in the building during the ensuing testing, with notices warning people against drinking from taps.
WA Building Commissioner Peter Gow a week ago published an interim report of the investigation into the discovery of asbestos inside ceiling panels in July, which found fault lay with Chinese supplier Yuanda but also said John Holland should have done more to protect workers.
John Holland was originally expected to complete the building by the end of 2015 and Health Minister John Day has repeatedly expressed his disappointment with handover dates being missed "time after time", indicating the government will remember this when considering the company's future bids for work.