The World Health Organization (WHO) Guidelines on Sanitation and Health should always be followed. At present, no additional measures specific to COVID-19 are recommended by WHO, U.S. Centers for Disease Control and Prevention (CDC), or Occupational Health and Safety Administration (OSHA). While the genetic material of SARS-CoV-2 has been detected in untreated wastewater, there have been no reports of SARS-CoV-2 being transmitted via treated or untreated wastewater.
Properly designed and functioning wastewater treatment plants (WWTP) and on-site sanitation systems that include safe disposal in-situ or an emptying and transport service chain to a faecal sludge treatment plant, should reduce the risk posed by faecal pathogens, including SARS-CoV-2. As an additional precaution, WWTPs might consider adding a final disinfection step (often known as tertiary treatment) to further reduce risk posed by viral pathogens like SARS-CoV-2 before discharge. Chlorine disinfection of wastewater effectively inactivates the SARS-CoV-1 (the virus responsible for SARS) at low concentrations (0.5 mg/L free chlorine residual) though standard dosing recommendations should be followed. Chlorine disinfection is not recommended for wastes containing large amounts of solid organic matter (like sludges or pit latrine contents) as it is less effective in these types of waste. Where WWTPs are not available, properly managed waste stabilization ponds are a simple treatment alternative that can effectively reduce pathogen loads. Wastewater treatment processes, including a final disinfection step, may not completely eliminate infectious viruses from effluent or treated sludge and safe disposal remains important.
Want to know more about faecal-oral transmission of COVID-19?
- What is faecal-oral transmission?
- Can transmission occur via aerosolized faeces?
- How long can SARS-CoV-2 persist in the environment?
- Amount of infectious virus shed in faeces and infectious dose
- Has SARS-CoV-2 been detected in human faeces?
- How do we detect COVID-19 in human faeces?
- If COVID-19 is a respiratory disease, why would it be detected in faeces?
- Guidance for sanitation workers
- Can water sources be contaminated with SARS-Cov-2?
- Guidance for water treatment
- Water quantity