Amy Baker/Stuff Tenant Caroline said sewage run-off on her property was costing her "hundreds and hundreds" of dollars.

Auckland Council has stepped in to help a renter who has had raw sewage flowing across her property for months.

Caroline* moved into her Whenuapai rental in March, only to find a month later that paddocks on the property were being flooded by sewage overflow from her next-door neighbour's septic tank.

The tenant, who has four horses, said the issue had been a "nightmare".

"It's costing me hundreds and hundreds of dollars feeding my livestock in what paddocks are left for them to graze in.

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"It runs down the entire property, so it takes over all of the front paddocks. It spreads, and when it rains, you know, it comes close to the house."

Of the five paddocks that are part of the property, she was only able to use two of them due to the overflow, she said.

She also had to walk through the sewage on a daily basis to get to the animals and had restricted where her son could play.

When the issue arose, Caroline contacted her property manager, who then contacted Auckland Council and the neighbour's property managers, Ray White Damerell Group Property Management.

An spokesperson said it organised an initial pump out of the septic tank when it was first alerted to the problem in May.

When the issue didn't go away, it ordered a weekly pump from July while looking into more permanent solutions.

However, Caroline said this made "no difference" to her problem.

After the property managers, the council and a waste expert met in July, Caroline said she was told a new system would be installed in about six to eight weeks.

But by the end of August nothing had been done.

When she contacted her property manager again, she found the work had been cancelled soon after it was agreed, she said.

Amy Baker/Stuff Caroline said she can only use two of the five paddocks for her horses.

"We've been sitting around for another two months, like muppets, expecting the job to be done."

On August, 30, Auckland Council issued an infringement notice against the neighbouring property owners for discharge of sewage

The council's team manager compliance investigations Kerri Fergusson said the council had been working with the property owner to help resolve the tank leak since June.

"Following water testing, which found contaminants, the property owner agreed to fix the tank," she said.

"However, these works were not carried out."

As the tank had not been fixed, the infringement was issued, Fergusson said.

A Ray White Damerell Group Property Management spokesperson said at the July meeting that full replacement or repair of the tank was agreed to be the best permanent fix, but there was "no quick solution" as both options required the neighbouring tenant vacating the property.

Amy Baker/Stuff The wastewater runs down the property as it slopes.

A waste expert also advised that regular pumping of the tank was working to prevent overflow, the spokesperson said.

The current tenants of the leaking property had been issued with a 90-day notice to leave the property, but no "permanent solution" had been decided.

The spokesperson said the decision not to go ahead immediately with a full tank repair or replacement was "not communicated to all parties", in light of the 90-day notice being issued.

The agency had been advised by the council that further spillage was likely due to recent heavy rain, and a pump truck attended the property on August 30.

Caroline's property must be cleared by September 6 under the council infringement notice.

* Full name has been withheld to protect identity