GWMWater is a water supplier within the terms of the Safe Drinking Water Act 2003, which provides a legislative framework for assuring drinking water quality in Victoria.
We work hard to provide as many of our customers as possible with access to safe, high-quality drinking water that consistently meets consumer and regulatory requirements. Our region has 18 water treatment plants that supply treated water to 89 percent of our urban customers.
Use the table below to find out how your drinking water is treated.
| Town | Treatment process | Chemicals used in treatment process |
| Ararat |
Coagulation, flocculation, dissolved air flotation, filtration, disinfection, fluoride, pH correction |
Lime, potassium permanganate, powdered activated carbon, aluminium sulphate, chlorine, fluorosilicic acid |
|
Birchip |
Coagulation, flocculation, dissolved air flotation, filtration, disinfection, pH correction |
Sulphuric acid, polyaluminium chloride, chlorine |
|
Charlton |
Coagulation, flocculation, dissolved air flotation, filtration, disinfection, pH correction |
Sulphuric acid, polyaluminium chloride, chlorine |
|
Dimboola |
Coagulation, flocculation, dissolved air flotation, filtration, disinfection, pH correction |
Sodium hydroxide, aluminium sulphate, chlorine |
| Donald |
Coagulation, flocculation, dissolved air flotation, filtration, disinfection, pH correction (receives water from St Arnaud) |
Aluminium sulphate, sodium hydroxide, chlorine |
| Edenhope |
Coagulation, flocculation, dissolved air flotation, filtration, desalination, disinfection |
Polyaluminium chloride, chlorine |
| Great Western |
Microfiltration, disinfection, pH correction |
Sulphuric acid, polyaluminium chloride, sodium hydroxide, chlorine |
| Halls Gap |
Coagulation, flocculation, dissolved air flotation, filtration, disinfection, pH correction |
Lime, aluminium sulphate, chlorine |
| Hopetoun |
Coagulation, flocculation, dissolved air flotation, filtration, desalination, disinfection, pH correction |
Soda ash, aluminium sulphate, chlorine |
| Horsham |
Coagulation, flocculation, dissolved air flotation, filtration, disinfection, fluoridation, pH correction (receives water from Horsham, Mt Zero) |
Lime, aluminium sulphate, chlorine, carbon dioxide, fluorosilicic acid |
| Jeparit |
Coagulation, flocculation, dissolved air flotation, filtration, desalination, disinfection, pH correction (receives water from Rainbow) |
Sulphuric acid, polyaluminium chloride, soda ash, chlorine |
| Lake Bolac |
Microfiltration, disinfection- receives water from Willaura |
Soda ash, calcite, aluminium sulphate, hydrochloric acid, sodium hypochlorite, carbon dioxide, ammonia, chlorine |
| Manangatang |
Disinfection, AMIAD filtration |
Ultrion 44560 Coagulant, chlorine |
| Minyip |
Coagulation, flocculation, dissolved air flotation, filtration, disinfection, pH correction (receives water from Murtoa) |
Sodium hydroxide, aluminium sulphate, chlorine |
| Murtoa |
Coagulation, flocculation, dissolved air flotation, filtration, disinfection, pH correction |
Sodium hydroxide, aluminium sulphate, chlorine |
| Natimuk |
Coagulation, flocculation, dissolved air flotation, filtration, disinfection, fluoridation, pH correction (receives water from Horsham, Mt Zero) |
Lime, aluminium sulphate, chlorine, carbon dioxide, fluorosilicic acid |
| Nhill |
Coagulation, flocculation, dissolved air flotation, filtration, disinfection, pH correction (receives water from Dimboola) |
Sodium hydroxide, aluminium sulphate, chlorine |
| Ouyen |
Microfiltration, disinfection |
Polyaluminium chloride, chlorine |
| Pomonal |
Coagulation, flocculation, dissolved air flotation, filtration, disinfection, pH correction (receives water from Halls Gap) |
Lime, aluminium sulphate, chlorine |
| Quambatook |
pH correction, coagulation, flocculation, dissolved air floatation, media filtration, carbon filtration, disinfection |
Sulphuric Acid, aluminium chlorohydrate, chlorine |
| Rainbow |
Coagulation, flocculation, dissolved air flotation, filtration, desalination, disinfection, pH correction |
Sulphuric acid, polyaluminium chloride, soda ash, chlorine |
| Rupanyup |
Coagulation, flocculation, dissolved air flotation, filtration, disinfection, pH correction (receives water from Murtoa) |
Sodium hydroxide, aluminium sulphate, chlorine |
| Sea Lake |
Disinfection |
Chlorine |
| St Arnaud |
Coagulation, flocculation, dissolved air flotation, filtration, disinfection, pH correction |
Aluminium sulphate, sodium hydroxide, chlorine |
| Stawell |
Coagulation, flocculation, dissolved air flotation, filtration, disinfection, pH correction |
Carbon dioxide, sodium hypochlorite, lime, aluminium sulphate, chlorine |
| Underbool |
Coagulation, sand filtration, pH correction |
Sulphuric acid, polyaluminium chloride, chlorine |
| Warracknabeal | Coagulation, flocculation, dissolved air flotation, filtration, disinfection, pH correction | Powdered activated carbon, lime, aluminium sulphate, chlorine |
| Willaura |
Microfiltration, disinfection |
Soda ash, calcite, aluminium sulphate, hydrochloric acid, sodium hypochlorite, carbon dioxide, ammonia, chlorine |
| Wycheproof |
Coagulation, flocculation, dissolved air flotation, filtration, disinfection, pH correction (receives water from Charlton) |
Sulphuric acid, polyaluminium chloride, chlorine |
What is the water quality in your town?
GWMWater tests your water quality regularly to ensure that it is fit for purpose.