The mother of a Perth girl left with severe brain damage after a near-fatal electric shock at her public housing home has described as "agonising" the wait for an investigation into the accident, only for it to fail to establish who was to blame.

Key points: Denishar Woods was shocked with 250 volts from a garden tap at her house

Denishar Woods was shocked with 250 volts from a garden tap at her house A technical fault caused electricity to flow from the mains power through the tap

A technical fault caused electricity to flow from the mains power through the tap Denishar was left with severe brain injuries and her family is suing for compensation

Denishar Woods was 11 when she was shocked by a garden tap at her family's Beldon home in March last year.

The electric shock hit her with a surge of up to 250 volts of electricity, which is five times the amount that can cause serious damage to the human body.

Her mother, Lacey Harrison, was also injured in the accident as she tried to drag her daughter out of a puddle of electrified water.

She was put on life support and not expected to survive the accident, but was able to breathe unassisted when the life support was withdrawn.

Denishar Woods was trying to turn off a garden tap when she received an electric shock. ( Supplied )

But an MRI scan showed she had suffered a significant brain injury from which she was unlikely to ever recover and she now requires 24-hours-a-day care.

Ms Harrison described the time spent waiting for Friday's report to be handed down as "agonising".

"Waiting to only find out that their conclusion is that they can't really put fault to a name, yeah it is tough," Ms Harrison said.

"It is sad that no one has taken full liability and put their hand up.

"The State Government needs to not cover up their mess but take responsibility, because there is never a night that I get to go to sleep properly.

Denishar Woods suffered catastrophic brain injuries. ( Supplied: Lacey Harrison )

"I know that my daughter is never going to be the same."

The family had engaged a lawyer but Ms Harrison said they had been waiting for the Department's report before pursuing compensation from the State Government and Western Power.

Money won't bring 'my little girl' back

The family was yet to formally accept the Government's $1 million act of grace payment offered earlier this year on the understanding the amount would be deducted from any successful damage claim against the state.

Ms Harrison she said she hoped the matter could be settled out of court.

"Money is not going to give my little girl back," she said.

Lacey Harrison and her daughter Denishar Woods's lives have been transformed by the accident. ( ABC News: Charlotte Hamlyn )

"I want to invite government people to come and spend one whole day with me.

"One whole day and hear from a mother's point of view what we go through.

"Money is not going to fix it, nothing will ever give me back what I had."

Sorry, this video has expired Denishar Woods was not expected to survive.

Housing Minister Peter Tinley said the Government was waiting for a claim to be lodged by the family.

"Until that time we will continue to support the family on a daily basis," he said.

Mr Tinley said the State Government had so far spent half a million dollars assisting the family since the accident.

He said the Government was also planning to provide a modified vehicle and a purpose-designed home for the family to move into before Christmas.

How a tap became an electrical hazard

The investigation found a conductor connecting the electricity provider cable to the property failed after prolonged heating, causing the garden tap to become electrically live.

The mains connection box that was badly damaged, causing the electric shock that injured Denishar Woods. ( Supplied: Department of Mines, Industry Regulation and Safety )

But the probe, by the building and energy division of the Department of Mines, Industry Regulation and Safety, could not determine why the fault occurred and whether electricity provider Western Power or the Department of Housing, which owned the property, was responsible.

Director of Energy Safety Saj Abdoolakhan said the heating process severely damaged the equipment, preventing investigators from making a conclusive finding about what caused the fault and who was to blame.

The damage was so extensive, it was impossible to conclude what caused the fault. ( Supplied: Department of Mines, Industry Regulation and Safety )

"While our investigation has answered many questions, it is disappointing — above all, for the young girl and her family — that we cannot be more conclusive due to the damaged condition of the components," Mr Abdoolakhan said.

Mr Abdoolakhan said the mains connection box was the responsibility of the consumer, in this case the Department of Housing, but there was no maintenance program in place for neutral conductors and regular inspections would be impractical.

He urged consumers to act immediately on signs of a faulty neutral connection, like receiving electric shocks from taps, pipes or appliances.

'Tingle' from light switch six months earlier

The report also found in August 2017, six months before the incident, the family had contacted the Department if Housing reporting a child had received a "tingle" from a bathroom light switch.

An inspection was conducted at the home and the switch was replaced, but no other defects were noted.

It is understood that incident was not relayed to Western Power.

Mr Tinley said he was confident the correct procedures had been followed.

"I reject the notion that's out there that there had been no maintenance on this house in 25 years — I reject that utterly," he said.

"Since about April 2017 various bits of maintenance were done on the house.

"On a couple of occasions those were electrical faults. They were attended to by a qualified electrician and cleared.

"Let's be clear, there is nothing that could have been done any faster than was done prior to the occurrence of the incident that would have intercepted this issue.

"That said, I've asked them to look at those procedures and work with the relevant agencies to see if they can, if at all possible, be improved.

"I'm sorry, I've been with this [from] the start and it's rather traumatic for all of us, not least of course the family of Denishar Woods themselves."

Energy Minister Bill Johnston said 238,000 smart meters would be installed on the state's South West Interconnected System over the next four years to improve detection of electrical problems.

He said people who experienced tingling sensations in their hands or feet stemming from an appliance in their home should call Western Power.

Mr Johnston said the Government had also allocated $61 million to install special equipment to detect electrical shock warning signs and was developing a public safety campaign.