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Audio, Radio New Zealand

The Ōtakaro-Avon and Ōpāwaho-Heathcote in Christchurch are some of the most polluted in the region.  While the Avon has received a lot of attention since the Canterbury Earthquakes with $100 million going into a new promenade and cleaning up its water quality, it's a different story for the Heathcote River where raw sewage and industrial chemicals are still regularly found. Niva Chittock reports.