Water Saving - 20 August 2025

Can You Use Rainwater Tanks for Bathroom Water?

Rainwater harvesting is becoming increasingly popular in Australia, not just for gardens and lawns but also inside the home. One of the most common questions we get at Tankworld is: Can I use my rainwater tank for bathroom water?

The answer is yes, with the right system and regular maintenance.

Why Use Rainwater in Bathrooms?

Using your rainwater tank for bathroom applications is a smart way to:

• Reduce water bills by cutting down mains water use
• Support sustainability during droughts and water restrictions
• Make the most of soft water that is gentler on skin, hair, and appliances

Every flush or load of laundry adds up, so diverting tank water into your bathroom can make a noticeable difference.

What Bathroom Uses Are Safe for Tank Water?

Rainwater is commonly used for:

• Toilet flushing, which is a simple, safe, and effective way to save thousands of litres of mains water each year
• Laundry, as washing machines run efficiently on soft tank water, helping clothes feel fresher and last longer
• Showers and baths, which are possible with good filtration and regular tank maintenance
• Hot water systems, where rainwater can be plumbed into heaters to help reduce household running costs

With the right filtration and tank care, some households also use rainwater for drinking and cooking. In urban areas, however, health authorities often recommend keeping mains water for those purposes.

Safety and Regulations

Rainwater can be a safe and reliable supply, but it must be collected, stored, and treated properly. Important factors include:

• Tank design, with polyethylene tanks like those offered by Tankworld that are food-safe, UV-stabilised, and built to meet Australian standards
• First-flush diverters, which prevent the first flow of rainwater containing dust, bird droppings, or debris from entering the tank
• Filtration and treatment, with filters, UV systems, or sediment traps, helping to ensure water is suitable for bathroom use
• Preventing contamination, using screens and flap valves to keep mosquitoes and pests out

The National Construction Code, Plumbing Code of Australia, requires rainwater systems to be installed in a way that prevents contamination of drinking water supplies. State health departments also provide guidance. For example, in New South Wales, mains water is recommended for drinking, while tank water is encouraged for non-drinking uses such as toilets and washing machines.

Maintaining Your Tank for Bathroom Use

To keep tank water safe for your bathroom, follow these maintenance tips:

• Clean gutters and downpipes regularly to stop leaves and debris from entering
• Inspect and clean strainers and filters every few months
• Flush the tank periodically to remove sediment build-up
• Check lids and covers to ensure no light, insects, or animals can get inside

With these steps, you can enjoy a reliable and clean supply of rainwater year-round.

FAQs

Can I use rainwater for my toilet?
Yes, this is one of the most efficient and recommended uses of tank water.

Is it safe to shower in rainwater?
Yes, provided your tank and filtration system are properly maintained. Many Australian households do this successfully.

Can I drink tank water?
Yes, but only if the system is correctly installed, regularly cleaned, and fitted with suitable filtration. In cities, mains water is usually advised for drinking and cooking.

What size tank do I need for bathroom use?
It depends on your household size, rainfall, and water habits. Tankworld offers tanks from 330 litres up to 45,400 litres, so there is an option for every situation.

Do I need a pump?
Yes, to move water from the tank into your bathroom appliances, a pump is required. Tankworld offers tank and pump packages designed to make installation simple.

Final Thoughts

Rainwater tanks are not just for the backyard. With the right setup, they can provide a safe and sustainable water source for your bathroom, from flushing toilets to powering your washing machine and even enjoying softer showers.

At Tankworld, we offer a full range of Australian-made, ISO-certified polyethylene tanks in a variety of sizes and colours, along with pumps, filters, and diverters to help you get the most out of your rainwater system.

If you want to explore the options, browse our rainwater tank range or contact our team for expert advice.