A report to Derry City and Strabane council has highlighted anti-social behaviour and fly-tipping at the toxic Mobuoy dump on the outskirts of the city.

The illegal disposal of waste at the site was uncovered in 2013.

It is estimated that up to 1.6 million metres cubed of waste is located at the site, with dumping dating back to the 1960s.

An internal report from the Department for Agriculture, the Environment and Rural Affairs (DAERA) says the waste is producing landfill gas and leachate with no engineered controls in place.

The River Faughan, which supplies 60% of the city’s drinking water, runs next to the site.

Mobuoy: How Derry’s illegal monster dump is polluting the city’s water supply

DAERA and the Northern Ireland Environment Agency (NIEA) have however given assurances that the city’s drinking water is safe based on regular testing.

A report presented to councillors in Derry and Strabane on Wednesday said an NIEA technical team continues to inspect the site on a weekly basis and there are “ongoing issues with anti-social behaviour” at the site.

“NIEA have notified the landowners and the team are liaising with PSNI seeking further advice, mindful of the limitations given NIEA do not own the site,” the report states.

“NIEA are not the registered owners of the site, and as such, do not hold the statutory powers to secure and prevent access to the site.

“However, NIEA have taken all reasonable measures to ensure members of the public do not inadvertently stray into the site at Mobuoy Road and have acted on advice on this issue provided by the Police Service of Northern Ireland (PSNI) and the Northern Ireland Fire and Rescue Service (NIFRS).

“The perimeter security measures put in place by NIEA are inspected on a weekly basis and, if necessary, repairs are carried out as soon as possible. However, given the large scale of the site, it is impossible to keep people out who are determined to enter.”

It added: “Works to reinstate retractable bollards across the entrance to City Industrial Waste were complete on the 28th May 2024.

“The retractable bollards are intended to prevent unauthorised vehicular access to the site. During a routine site inspection on the 31st May 3024 it was discovered that one of the reinstated retractable bollards had been vandalised and removed from the site entrance.

“Fly-tipping continues to be an issue at the site, particularly at the site entrances.

“However, no fly-tipping incidents were recorded by NIEA staff while conducting site inspections during June.”

DAERA has been contacted for comment.