Residents have met with scientists amid fears chemicals have contaminated land near old RAF base.
Fly fishers say the salmon population at the burn in Moray has been wiped out and could take years to recover.
It comes as the UK looks to restrict the products to vet visits.
The Environment Agency says it received almost 500 complaints from residents near the Cumbrian site.
Natural England describes the condition of the River Wye as "declining".
Jane and Tony Coyle spent seven years waiting for planning permission due to River Lugg pollution.
Spey Fishery Board has blamed a fly-tipping incident in a nearby lay-by.
The Environment Agency says tests indicate the majority of pollutants have been contained in two pools.
The company paid the highest total to the Environment Agency for pollution and poor performance.
