Water quality

We are committed to providing clean and safe drinking water to our community. To find out more about how we monitor water quality, please see Drinking water quality monitoring.

What is water hardness?

Hardness in drinking water is usually due to the presence of large amounts of two minerals, calcium and magnesium.

Very hard water can cause:

  • scale to build up in kettles and hot water systems;
  • difficulty in getting a lather when washing your hands with soapy water

Degrees of hardness

Degrees of hardness are described in the Australian Drinking Water Guidelines as:


Description of hardness

Less than 60 mg / L CaCO3 (Calcium Carbonate)

Soft but possibly corrosive

60-200 mg/L CaCO3

Good quality – Our water quality is good quality

200-500 mg/L CaCO3

Hard, with increasing scaling problems

Greater than 500 mg/L CaCO3

Hard with severe scaling

What is the hardness quality in Logan’s water supply?

Logan’s water supply is in the ‘good quality’ range. We routinely measure the hardness of the water supply throughout the network.

How do I find information about the water hardness setting for my dishwater?

Some types of dishwashers require you to program them with a hardness setting. You should leave your dishwasher on factory settings where possible. If in doubt, please contact the manufacturer for more information.

Is it safe to use water straight from the tap in aquariums or fish tanks?

Water straight from the tap should not be used in aquariums or fish tanks. You should test and treat the water before adding it to your fish tank. Tap water can kill your fish and the good bacteria that breaks down waste in your fish tank filter. Please call your local pet store or aquarium for information about how to make the water safe for your fish.

What is Legionella?

Legionella is a term for diseases caused by the Legionella bacteria including the most serious, Legionnaires' disease, as well as the less serious condition of Pontiac fever.

Council is not required to test for Legionella in our drinking water network. 

The Public Health Act 2005 and the Public Health Regulation 2018 aim to reduce the health risks of Legionella bacteria in the water at hospitals and aged-care facilities.

The legislation affects:

  • Queensland Health hospitals and inpatients
  • private health facilities
  • Queensland Health aged-care facilities
  • private aged-care facilities

The requirements for the facilities are to:

  • develop a water risk management plan that covers all water-related hazards including monitoring for Legionella
  • follow their water risk management plan
  • notify the chief executive or the Department of Health within one business day of detecting Legionella
  • regularly send reports with the results of testing for Legionella.

For more information on how to develop a water risk management plan for Legionella, please visit Queensland Health.

Does Council test for Legionella?

No, We follow the Australian Drinking Water Guidelines (ADWG) and Queensland public health guidelines for drinking water and testing. The guidelines we follow do not include testing for Legionella..

Legionella is a health risk when it grows over time in plumbing fittings and other areas where warm water can make it grow. It is best controlled by maintenance of these areas.

What is E.coli (Escherichia coli)?

E. coli is an indicator bacteria. Most varieties are harmless, but its presence in drinking water is a warning sign of possible contamination.

We conduct weekly tests for E. coli across the network. If we detect E. coli, we will notify the public and take action immediately, working closely with Queensland Health to protect public health.

Why does my water taste different?

My water taste like chlorine / pool water

We use chloramine or chlorine to disinfect drinking water. These kill harmful micro-organisms and make our water safe to drink. If you find the taste is too strong, place a container of water in the fridge for a few hours, and the chlorine taste will reduce.

Controlled dosing with chlorine or chloramine is a safe and effective method to protect against contamination of the water supply by microbiological organisms. For information about water disinfection, please download our Water Disinfection Factsheet (PDF 33 KB).

If the water smells strongly of chlorine, is unpleasant to drink, or if have concerns, please call us on 3412 3412.

My water tastes like petrol, kerosene or pesticide

Petrol, solvents and pesticides can make their way in to domestic (plastic) plumbing pipes. Have any paints, solvents, petrol or kerosene has been used on the property lately? Were they disposed of correctly?

Incorrectly disposed of chemical disposal may contaminate your water and lead to health risks and costly repairs. We have regular chemical drop-off days for you to dispose of unwanted chemicals.

Your water should not taste like petrol, kerosene, pesticide or any other petrochemical product. If your water tastes like this do not drink it. Please call us immediately on 07 3412 3412.

For more information download our Chemical Contamination Factsheet (PDF 127 KB)

My water tastes like plastic

Many new plumbing installations use plastic pipes. When first installed, there can be a plastic taste to the water for a few days. You can reduce this taste by running the water for two to five minutes before drinking.

If you have concerns about the quality of your water supply, please call us on 07 3412 3412.

My water tastes metallic

Corrosion of iron or copper pipes in your household plumbing can lead to a “metallic” taste. This can also cause your water to look orange, rusty, or blue which can stain sinks. This can happen if you have not used your taps for a while. If you run your taps for a few minutes the taste should disappear. To treat the staining, you may use a lemon-based cleaning product which contains citric acid.

Your licensed plumber can help you if the problem continues.

My water tastes musty or earthy

South East Queensland water supplies often have a slight “musty” or “earthy” taste. This is from algae and other microorganisms in the raw water supply. These tastes and odours are more common during the hotter months of the year.

The water is still safe to drink. You can remove the taste by using household carbon filters. For more information, please Seqwater.

Why is my water a different colour?

My water looks white or milky

If your water looks white or milky, it could be due to recent maintenance, which can trap air bubbles in pipes.

You can check this by filling a glass with water and leaving it to sit. If the milky colour disappears, it is due to the air bubbles and is safe to drink.

If it does not clear within 10 minutes, please call us on 07 3412 3412.

My water looks dirty, brown or black

Unexpected events like broken water mains or firefighting could result in dirty water. This is due to deposits that build up over time being disturbed by the change in the water flow and direction.

If your water is dirty:

  • Run the tap closest to the water meter for 5 to 10 minutes. Flushing a domestic tap for 5 minutes uses about 75 litres of water which costs approximately 30 cents.
  • Run the outside tap at the back of your property until the water is clear for 5 to 10 minutes
  • You may want to reuse this water by filling a bucket to use on your plants or garden.

If your water does not turn clear, please call us on 07 3412 3412.

If you have dirty water, avoid using your dishwasher or washing machine until the issue has been resolved.

The water is safe to drink. If there is ever any health risk in the water supply, we will notify the public immediately.

My water orange or rusty looking

Orange or rusty brown water that turns clear after 2 to 5 minutes may indicate there is corrosion in the plumbing of your house. Water pipes in older homes were made of galvanised iron, which corrodes over time.

A licensed plumber can help you locate the problem and replace the old pipes. If you do not replace the pipes, they may start leaking or burst over time.

Why is fluoride added to drinking water?

Fluoride is added to the drinking water by Seqwater - the bulk supply entity who source and treat South-East Queensland’s drinking water. Logan City Council does not add any more fluoride to the water.

Fluoridation in Queensland is regulated by the Water Fluoridation Act 2008 and Water Fluoridation Regulation 2008.

If you have any questions about fluoride, please contact Queensland Health on 13 HEALTH (13 43 25 84) or visit Queensland Health.

For more information about fluoridation recommendations please visit the following websites: