Enfield Council worked with Thames Water to tackle the problem caused by waste water pipes and more than 300 problems with faulty plumbing have been rectified. Thames Water have also recently reconnected a surface water pipe to stop the lake becoming stagnant.
Enfield Council's Cabinet Member for Environment, Cllr Daniel Anderson, said: "The problem of pollution in Pymmes Park has been with us for years, and thanks to the dedicated work of our partners the Friends of Pymmes Park, Enfield Council, Thames Water, the Environment Agency and Thames21 we are really getting on top of the problem.
"The wetlands, which are being constructed, will go a step further to minimise pollution as the plants and animals placed there will help reduce contaminants. In addition it will create a beautiful centrepiece for wildlife and a place for people to go to enjoy the park."
Jenny Jenkins, the Acting Chair of the Friends of Pymmes Park said: "The wetlands will be a beautiful place for people to visit in Pymmes Park, will also attract varied species to make it their home and reduce pollution as well! We are looking forward to its construction."
John Bryden, Senior Programmes Manager for Thames21 added: "The pollution of Pymmes Park lake has been on-going for a significant period of time with the sources of pollution coming from a wide area including Winchmore Hill and Palmers Green.
"This project has not only undertaken detailed work to identify and correct homes and businesses which are incorrectly plumbed and inadvertently putting their toilets, sinks and shower water into the lake and Pymmes Brook, but also developed this wetland to filter and clean the rain which runs off the roads in the area, which can contain oils, tars and sediments further polluting the lake and brook.
"This project is one of the first of its kind in the UK, and really sets an extremely high standard for others to follow in how to resolve the pollution of our rivers and waterways, while creating an excellent environment for wildlife such as dragonflies and wetland birds to live in and people to enjoy."