Untreated (or inadequately treated) wastewater can pose a serious threat to public and environmental health. Wastewater may contain disease causing pathogens (viruses, bacteria, and parasites), chemicals, and other contaminants from household, industrial or commercial activities.
Many of these substances can cause disease when ingested by humans so prevention of contamination of food and water supplies with sewage or blackwater is critical to preventing disease of both individuals and entire communities. This is especially important in our water catchments areas, where leaking or failing systems can potentially contaminate the water used for drinking.
The discharge of untreated or poorly treated wastewater into either surface or ground water also has the potential to seriously impact the environment, with impacts on both plant and animal species. The delicate ecological balance can be damaged due to increased levels of nitrogen and phosphorus, and exposure to chemicals and pathogens.