Nelson Dirty Water Complaints Investigation

Nelson Dirty Water Complaints Investigation

Client

Nelson City Council

Our investigation determined the likely cause of our client’s long-running dirty water complaints and outlined recommendations for how to definitively confirm the cause as well as how to treat it and improve water quality. 

Our Role

Process Investigation

The Nelson water supply (South Island, New Zealand) had a long history of customer complaints about the aesthetic quality of the water. Several theories existed as to the cause of the complaints, but no clear reason was identifiable. Our evaluation determined that there was a large historical build-up of iron and manganese in the reticulation system. The project then evaluated why the deposits were being released and determined how the release could be stopped to improve water quality.