Rainwater tank and pump maintenance

Why do you need to maintain a rainwater harvesting system?

Neglected rainwater storage systems can result in blockages causing back-up and overflow from roof gutters or erosion of the tank site. Rainwater tanks may harbour potentially harmful bacteria, insects and mosquitoes, algae and other micro-organisms. The first you may know of this is when you notice smelly water or staining of laundry and internal plumbing fixtures. 

The good news is that there is a simple answer: basic knowledge and regular maintenance.  In short: care for your rainwater harvesting system and be rewarded with an on-going supply of healthy rain water and peace of mind.  


Preventative maintenance works to maximise rainwater system efficiency and protects your investment

Blocked overflow outlet pipe will result in the tank overflowing from the top with possible base erosion

Debris on tank inlet strainer prevents water entering the tank, particularly during heavy downpours

Overflow blockage may place undue structural pressure on the tank

Roof catchments must be kept clear in order to maximise rainfall capture and cleanliness

Rainwater tank maintenance is an integral aspect of ensuring your rainwater system continues to provide maximum benefit.  As with other aspects of your property, your rainwater storage system is a valuable investment and requires regular preventative maintenance to avoid costly rectification work. Making sure that your rainwater storage system components are maintained in good condition will extend the life of the system and help preserve the quality of the water stored in the tank. 


Basic Rainwater Tank and Pump Maintenance Program



Check rainwater catchments are clean and free of debris

Empty and clean first-flush diverters and rain heads

Remove, clean and check inlet and outlet/overflow strainers



Service water pump

Replace water filter 





Complete system inspection including structural integrity check

Water quality testing

UV filter system lamp replacement



Tank cleaning to remove accumulated sediments/sludge from bottom of tank.  

If you are short on time or just prefer the confidence of professional advice, Water Tactics provides a comprehensive rain water tank and pump preventative maintenance service, which we recommend on an annual basis.

As part of the service, we check to ensure your rainwater harvesting system is operating at optimum efficiency.


Our rain water tank maintenance services include

  • Inspection and servicing of rainwater system components – system integrity checking
  • Pump operation test and maintenance
  • Water quality testing and mosquito check/treatment
  • Sediment level check – indicating if tank cleaning is required
  • Detailed invoice/checklist – so you know exactly what we’ve done & can maintain your own record
  • Comprehensive inspection report and checklist – preferred by our commercial clients

Mosquitoes / insects

Mosquitoes and midges can enter and breed in rainwater systems when rainwater catchments and tanks are not properly maintained. We can remove and/or treat these pests and advise how to avoid further infestations. Not only do mosquitoes pose a potentially serious health risk, home owners can be fined if mosquitoes are found in stored rainwater.

With a warming climate, health authorities are concerned with the risk of mosquito-borne disease, such as Dengue Fever, travelling south from the tropics.  The Aedes aegypti mosquito, which transmits the Dengue virus, has typically not been able to survive in the cooler climates.  There seems to be some evidence that with milder winters, it is possible for this mosquito to survive in large protected areas of water – such as a rain water tank – until the outside temperature increases.

Properly maintained and screened rain water catchements and rainwater tanks elimate this risk.  Ensure your rainwater tank is secure with regular maintenance.  Simply follow our tank maintenace guide above or call us to provide a complete rain water tank health check service.

Tank cleaning

Over time, tanks require further attention to address water quality issues. The frequency of rainwater tank cleaning and desludging depends on the individual tank location, as many different factors affect the water quality in rainwater tanks. Most Government authorities recommend cleaning rainwater tanks at least every 2-3 years.

Water filtration

If you are using your tank water for drinking*, laundry, internal plumbing connection or irrigation, water filtration may be necessary to improve the water quality and avoid problems associated with tainted water.

*Please note: we do not recommend drinking tank water when a potable supply is available unless it is appropriately filtered to remove potentially harmful contaminants.

Call Water Tactics on 0408 509 228 or contact us to book a rainwater system maintenance service.