The partnership sees the production of soil out of sludge-derived materials and began thanks to chance meeting at the Great Yorkshire Show between Green-tech owner and chairman Richard Kay and representatives from Yorkshire Water.
Since then Green-tree has become a recognised environmentally-sound product.
It and has been specified for many major construction and landscaping developments across the country - including The Olympic Park Legacy.
There are also now 15 operational soil manufacturing units throughout the UK.
Green-tree business manager Mark Wood said: "The relationship we have with Yorkshire Water has been instrumental in the growth of Green-tree. We now produce a number of different soils to meet the market needs."
"Throughout 2014 we’ll be opening four new production sites. It’s a great success story and we’re really looking forward to the next ten years."
Yorkshire Water commercial products coordinatorJamie Gray added: "Our long running association with Green-Tech has been a great success. Without input and expertise from Green-tech it is unlikely that we would have managed to get this product to market."
Ten years ago the idea of producing soil from waste products was in its infancy. The process therefore needed a lot of research and development. Initial desk top trials were carried out and then rolled out to field scale trials under the stewardship of leading UK soil scientist Tim O’Hare (Tim O’Hare associates).
A process known as sludge phyto conditioning - which creates a product used to manufacture topsoil - was developed into an Environment Agency-approved protocol.