Water Quality and Treatment

Environment Water Quality Treatment Hero

Expand the sections below to learn more about water quality and water treatment from Dubbo Regional Council for the Local Government Area.


Council supplies drinking water quality water to the residents of Dubbo, Eumungerie, Mogriguy, Wellington, Geurie, Mumbil, Brocklehurst, Wongarbon and Ballimore. Drinking water is also sometimes called “potable” water. Non-potable water refers to water that cannot be directly consumed safely.

Further Information on drinking water quality management is contained within Council's Water Supply Services Policy, view this policy at Council's dedicated webpage; A-Z Council Policies.

The generally accepted drinking water quality guidelines for drinking water quality in Australia and New Zealand today are developed and updated by the National Health and Medical Research Council (NHMRC). The Australian Drinking Water Guidelines 2011 also reflect these international guidelines, such as those developed by the World Health Organisation (WHO) and the results of current medical research.  Below are the accepted values for various parameters and a value typical of Dubbo’s Water supply:

Parameters ADWG - 2011 Typical Dubbo Water Value

Hardness as CaCO3
 200 mg/l  80 mg/l
 6.5 – 8.5  7.5 – 8.5
Taste & Colour 
 Not Necessary  Acceptable to most people
Total Dissolved Solids  600 mg/l  250 mg/l
 True Colour Not Necessary  <5TCU 
 Turbidity <5 NTU  <1 NTU 
 Thermotolerant Coliforms None in 100 ml 
 Total Coliforms # No guideline value set #
 Chlorine (Max) 5 mg/l  1.40 mg/l 
 Aluminium <0.2 mg/l  <0.1 mg/l 
 Ammonia as NH3 <0.5 mg/l  0 mg/l 
 Antimony <0.003 mg/l  <0.003 mg/l 
 Arsenic <0.01 mg/l  <0.001 mg/l 
 Barium  <2.0 mg/l  <0.009 mg/l
 Boron <4.0 mg/l  <0.3 mg/l 
 Cadmium <0.002 mg/l  <0.001 mg/l 
 Chloride <250 mg/l  <80 mg/l 
 Chromium (as CR (VI))  <0.05 mg/l <0.01 mg/l 
 Copper <2.0 mg/l  <0.7 mg/l 
 Cyanide <0.08 mg/l  <0.08 mg/l 
 Fluoride <1.5 mg/l  0.08 to 0.12 mg/l * 
 Iron  <0.3 mg/l <0.1 mg/l 
 Lead <0.01 mg/l  <0.01 mg/l 
 Manganese <0.5 mg/l  <0.03 mg/l 
 Mercury <0.001 mg/l  <0.0001 mg/l 
 Nitrate (as NO3) <50 mg/l  <8 mg/l 
 Nitrite (as NO2) <3 mg/l  0 mg/l 
 Selenium <0.01 mg/l  <0.005 mg/l 
 Sodium <180 mg/l  <60 mg/l 
 Sulphate  <250 mg/l <30 mg/l 
 Zinc <3 mg/l  <0.3 mg/l 
 Hydrogen Sulfide <0.05 mg/l  0 mg/l 
 Iodide <0.1 mg/l  <0.1 mg/l 
 Molybodenum <0.05 mg/l  <0.05 mg/l 
 Nickel <0.02 mg/l  0.02 mg/l 
 Silver  <0.1 mg/l <0.1 

* Due to operational reasons Council is unable to add additional fluoride to the Dubbo water supply service area. The National Health and Medical Research Council supports Australian States and Territories fluoridating their drinking water within the range of 0.6 to 1.1mg of fluoride per litre. For more information around fluoridation of Dubbo Water Supply, visit dubbo.nsw.gov.au/fluoride

# No guideline value has been set for Total Coliforms


Council operates its water supply system ensuring the water quality meets the Australian Drinking Water Guidelines 2011 (ADWG) and NSW Health standards.

Our water quality monitoring program consists of sampling and testing of critical points within our treatment process and delivery system.

  • Treatment Plant - Samples are taken to monitor the source water quality which can vary due to catchment conditions.
  • Water Supply System - Samples are taken from various locations within the reticulation system and provide a typical profile of the quality of water being delivered to customers.


Council periodically undertakes a system wide water mains flushing program to protect the quality of the drinking water supply to residents, and to minimise the risk of water main breaks. This program is part of Council’s ongoing maintenance of the water reticulation network.

Council frequently tests water quality throughout the system to check that the water remains safe to drink and meets Australian Drinking Water Guidelines.


Dubbo Regional Council has issued public notices related to the fluoridation of Dubbo water supply. Read the notices and view answers to frequently asked questions at Council's dedicated webpage; Fluoridation of Water Supply


For information on the range of legislative requirements and responsibilities of Dubbo Regional Council related to water and sewer view our dedicated webpage; Council's Water and Sewer Responsibilities

Last Edited: 04 Aug 2023

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