Power and Water is responsible for delivering safe drinking water throughout a majority of the Northern Territory.
We treat drinking water to limit exposure to disease-causing microorganisms. This includes disinfecting the water with chlorine at many points from storage, to supply and to you.
Chlorine is the preferred disinfection treatment as it’s simple to use, destroys pathogens and provides protection throughout distribution.
The Department of Health provides a list of the harmful organisms we are trying to prevent.
The processes used to remove contaminants and improve and protect water quality are similar around the world. Treatment depends on the water quality issues.
As well as disinfecting your water, we may also add fluoride to meet Department of Health requirements.
The most widely applied water treatment is a combination of some or all the following.
During coagulation, a chemical, usually alum, is added to help bacteria and small solid particles stick together. Larger particles then settle in-situ, which we can easily remove.
Mechanical settling basins called clarifiers use gravity to separate solid particles and remove colour.
Filtration removes particles as water passes through filters or membranes. The method varies between treatment plants:
- gravity media filtration uses filters containing layers of sand
membrane filtration uses semi-permeable membranes with billions of microscopic pores.
Chlorine or ultraviolet light destroys disease-causing bacteria. Chlorine provides constant, effective protection from the treatment plant to the tap. This disinfection is especially useful in long pipelines and high water temperatures. We use chlorine for disinfection purposes in all drinking water supply systems. The amount of chlorine added is relative to the purity of the water and is typically less than one milligram per litre.
Fluoride naturally occurs in our water or, where possible is added in small amounts, less than one milligram per litre, to help prevent tooth decay. Fluoridation is recommended by the Department of Health.
Lime, caustic soda or soda ash is added to correct very soft natural water. The minerals in lime also help prevent household pipes and fittings from corroding.
Darwin River Reservoir
Howard East Borefield
Donkey Camp Weir
Cabbage Gum / Kelly Well Borefields
Roe Creek Borefield
More information is available in the current Drinking Water Quality Report.
Sophisticated monitoring and treatment processes ensure your drinking water meets high standards. More information is available in the current Drinking Water Quality Report.
A different mix of treatment processes apply in remote communities. These processes involve treating raw water before disinfection and distribution. Treatment methods include filtration and aeration.