This pie chart summarises the cause of the 420“major” pollution problems dealt with by the Auckland Regional Council during 1997

Wash Water Discharge (30%)
Discharge from an Industrial Process (6%)
Contaminated Sites (5%)
Deliberate Discharge to Stormwater System (15%)
Site Housekeeping (Multiple Pollution Problems) (10%)
Not Traced (5%)
Material Spill (16%)
Discharge Outside the Metropolitan Area (6%)

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