Lead in drinking water at the delayed Perth Children’s Hospital remains at unacceptable levels, leaving the Barnett government still unable to commit to an opening date.
Reports of the contamination emerged in September and were a further embarrassment to building company John Holland, which was originally expected to complete the $1.2 billion facility in 2015.
Health Minister John Day says the lead levels are falling but he remains frustrated by the delays and problems with the hospital construction, which have included asbestos sheeting within ceiling panels.
"The levels of lead that have been detected in the water at the hospital are decreasing but ... they haven't come to the level which meet the Australian standard on a consistent basis," Mr Day told 6PR radio on Tuesday.
"As to when that will be achieved, if I knew, I would very much like to tell you.
"It is extremely frustrating and annoying."
Documents released by the Health Department following a Freedom of Information application from the Labor opposition revealed 16 sources of lead contamination had been identified at the hospital, as well as 3012 construction defects.