Streamwatch groups can be amongst the first to detect pollution events in local waterways.
If a preliminary inspection of a site reveals obvious water contamination such as raw sewage, blue-green algae, or a chemical spill, do not conduct Streamwatch testing.
Write down as much detail as you can about the location and event. If possible, take photos and collect a Google Maps pin drop
Contact the relevant authorities such as your local council, Sydney Water, and the NSW Environment Protection Authority (EPA) as soon as possible.