Every time there’s heavy rain, Land Air Water Aotearoa recommends waiting at least 48 hours before you return to swim at your local river, beach or lake. Ignoring their advice can lead to gastroenteritis, respiratory illnesses, skin infections and ear infections.

So why do New Zealand’s wastewater systems overflow thousands of times a year? Is there anything we can do to fix them? And how can you personally avoid swimming in human s***?

Made with the support of NZ On Air.