Keeping rainwater safe for your birds and family

You might carefully choose your birds’ feed, keep their housing comfortable and notice immediately when someone is off colour. Their drinking water deserves the same attention.

If you fill their drinker from a rainwater tank, the condition of your roof, gutters and tank can affect what they swallow. Looking after that supply helps protect your birds and, where the household shares it, your family.

Clear water is not always safe water

Tank water is part of everyday life for many New Zealanders. BRANZ estimates that approximately 10% of our population depends on roof-collected rainwater for drinking. Across the Tasman, Australian statistics recorded over 2.3 million households using rainwater tanks in 2013, including uses other than drinking. These older figures show how widely rainwater is used.

Bird and possum droppings, leaves and other debris can build up on roofs and in gutters, then wash into a tank. Rain after a dry spell can carry accumulated material into storage.

Water can look perfectly clear and still contain germs that could cause illness.

An Auckland study published in 2001 tested 125 household roof-water supplies. Seventy, or 56%, failed the study’s faecal-coliform criterion, indicating contamination concerns. Eighteen supplies also exceeded the drinking-water limit for lead.

This was a historical local sample, but it does show why appearance alone cannot tell us whether water is suitable to drink.

Risks for birds, family and other animals

For birds, contaminated water can introduce organisms such as Salmonella and Campylobacter. Water contaminated by wild birds is also relevant to avian influenza prevention.

Untreated ponds and dams visited by waterfowl are particularly concerning; roof water has its own risks, depending on how it is collected and managed. Lively birds are reassuring, but birds can carry some germs without looking sick.

Some infections can pass between animals and people. These are called zoonoses. With germs such as Salmonella, exposure can happen through contaminated water, droppings or equipment, followed by germs reaching someone’s mouth.

A shared tank could also expose birds and people to the same contamination without either infecting the other directly. Children, older adults and people with weakened immunity are particularly vulnerable to these pathogens and deserve greater consideration.

If your birds share a property or roof water drinking source with sheep, goats, calves, pigs or horses, consider their water too. Salmonella can affect several livestock species and spread through contaminated feed or water. Young animals can be especially vulnerable.

Trace which animals receive water from each tank, and include their troughs when reviewing the supply.

Start with the roof and storage

• Keep gutters clear.
• Check that roofing materials are suitable for collecting drinking water.
• Arrange removal of overhanging branches where appropriate.
• Secure tank lids and maintain screens that exclude animals and debris.

A first-flush diverter diverts the initial runoff away from the tank, reducing contamination. It is one useful safeguard within the system.

Follow the pipes

A treatment unit at the kitchen tap only treats water passing through that tap. Your outside hose may still supply untreated tank water to the birds.

Ask a plumber to check connections and appropriate backflow protection, which helps prevent contaminated water from animal watering systems flowing back into household plumbing.

Match testing and treatment to your supply

Testing can help identify problems that you cannot see. Treatment should match the findings: different filters and disinfection methods address different hazards.

Equipment needs maintenance, and a system that controls germs may not remove lead. Get advice before choosing products or adding chemicals.

Keep drinkers clean

Where your birds are housed, keep drinkers sheltered from wild birds and positioned so your birds cannot easily kick bedding or droppings into them.

Check them daily and clean them regularly, removing accumulated dirt before refilling with safe water.

Clean water can become contaminated after leaving the tank. Keeping the drinker clean is part of protecting the supply.

Make handwashing part of bird care

Wash with soap and running water after handling birds, collecting eggs or cleaning drinkers. Keep bird-care equipment out of food preparation areas and clean it outdoors.

Supervise children’s handwashing, and keep dedicated footwear for bird housing outside. These habits reduce opportunities for germs to travel from your birds’ housing into family life.

When to seek veterinary advice

If birds become unwell, seek veterinary advice. Diarrhoea, reduced appetite or an unexpected drop in laying can have many causes, so avoid assuming the water is responsible.

Several sick birds or sudden deaths need prompt attention. Tell your vet where the birds’ water comes from and whether anything has recently changed.

Create a simple water-care plan

A simple written plan makes these jobs easier to keep up with. Record:

• Where the water comes from.
• Who cleans the drinkers.
• When the system needs checking.
• Where you would obtain safe replacement water.

Keep test results and maintenance dates together. This also gives anyone looking after your birds clear instructions when you are away.

A useful first step is to take a few clear photographs of the tank, its inlet, any treatment equipment and the drinker. These can help explain your setup during a veterinary consultation and identify any parts that need a closer look.

Keep product details and previous laboratory water results handy so advice can be matched to your actual system.

How Avian Empire can help

At Avian Empire, we can help you review your birds’ water setup, identify possible health risks and decide when testing or specialist advice would be useful. Together, we can turn those findings into a manageable care plan.

Start by following the water from its source to your birds’ drinker and checking what could enter it along the way.

References
BRANZ Level. Mains or rainwater. Updated 29 October 2025.
Australian Bureau of Statistics. Environmental Issues Water use and Conservation March 2013.
Sources of water and its uses. Catalogue 4602.0.55.003.
Simmons G, Hope V, Lewis G, Whitmore J, Gao W. Contamination of potable roof-collected
rainwater in Auckland, New Zealand. Water Research. 2001;35(6):1518–1524. doi:10.1016/S0043- 1354(00)00420-6.
HealthEd. Water collection tanks and safe household water. HE10148. Reviewed January 2022.
US Centers for Disease Control and Prevention. Collecting Rainwater and Your Health An
Overview. 23 July 2024.
Australian Government Department of Agriculture Fisheries and Forestry. National Water
Biosecurity Manual Poultry Production. Sections on water sources, contamination and preventing
recontamination.
US Centers for Disease Control and Prevention. Backyard Poultry. Healthy Pets Healthy People.
Merck Veterinary Manual. Salmonellosis in Animals.
New Zealand Government. New grant for poultry industry launches. 18 August 2026.