Tribe has an allotment on Bolton Road next to the development, and said pollution had been entering the local beck on and off for about nine months.
“All the rain we’ve had, I think it’s been a problem for them, and at the moment they’re still just doing excavations, they’re not actually building any houses, so there’s big piles of soil,” he said.
“We are monitoring the situation in partnership with the Aire Rivers Trust and encourage people to report it to the Environment Agency.”
An Environment Agency spokesperson said: “We encourage anyone who witnesses a pollution incident to report it to our 24-hour incident hotline as early as possible.”