A health warning has been issued for the Waimakariri River in Canterbury following “high levels of faecal bacteria” found in consecutive samples.
In a statement, Health New Zealand Te Whatu Ora said high levels of faecal bacteria were found in consecutive samples taken from Waimakariri River upstream of the Old Highway Bridge North Bank.
Medical Officer of Health for the National Public Health Service Dr Cheryl Brunton said rainfall in the area in the last few days was the most likely cause.
“A number of other popular swimming sites in Canterbury may also have high levels of contamination after recent rainfall. People should avoid all rivers and beaches for at least two days after heavy rain,” she said.
“Water quality at affected sites is not considered suitable for recreational uses including swimming because of the risk to health from the bacteria and other pathogens.”
Eating shellfish from these sites should be avoided. If fish are eaten, remove the gut and liver and wash in clean water before cooking. For further information on gathering Mahinga Kai refer to information below.
Water contaminated by human or animal faecal matter may contain a range of disease-causing micro-organisms such as viruses, bacteria and protozoa.
“In most cases the ill-health effects from exposure to contaminated water are minor and short-lived. However, there is the potential for more serious diseases, such as Hepatitis A or Salmonella infection,” Brunton said.
The sites where water quality is affected are listed on Environment Canterbury’s website.