River health warnings
We monitor river sites regularly over the summer to check for bacteria (faecal contamination) and toxic algae.
Each river site is given a long-term grade prior to the summer monitoring season for suitability for swimming and recreation. The grade is based on the last five years of sampling. Sites that are not recommended for swimming because of their long-term grade are red on the Land Air Water Aotearoa (LAWA) website and signage should be in place at the site. Temporary Health warnings are issued when a site is graded as good to swim but there is now an increased risk of cyanobacteria or faecal contamination.
- Toxic algae (cyanobacteria) can occur in any waterway, at any time, so it is important that you know what it looks like. Find out more about toxic algae and how you can protect yourself and your animals.
- Faecal contamination poses a risk to health, it can cause gastrointestinal illnesses, respiratory diseases, and eye, ear, nose, throat and skin infections.
Temporary health warnings
Waihao River at Gum Tree Road (Don’s Hole)
Health New Zealand | Te Whatu Ora has issued a health warning after high levels of faecal bacteria were found in samples taken from Waihao River at Gum Tree Road (Don’s Hole).
Water quality at the affected site is not considered suitable for recreational uses including swimming because of the risk to health from the bacteria and other pathogens.
Water contaminated by human or animal faecal matter may contain a range of disease-causing micro-organisms such as viruses, bacteria and protozoa.
Other popular swimming sites in South Canterbury may also have high levels of contamination after recent rainfall. People should avoid all rivers, lakes and beaches within 48 hours of significant rain.
Find out more: Land, Air, Water Aotearoa (LAWA) - Otaio River
