Water for garden birds

Birds need water to drink and to bathe. It is also, the RSPB says, one way trichomonosis can spread. The rules below are from their feeding page and their October 2026 explainer. The BTO FAQs say the same about ponds and daily changes.

If you already have a pond

If you, or a neighbour, have a shallow edge where birds can drink and bathe, the RSPB says you do not need a separate bath unless the pond has dried up or frozen. The BTO’s FAQs use almost the same sentence. A pond is the water source the RSPB calls the best for birds and other wildlife, and they say ponds are likely to carry a lower trichomonosis risk than bird baths.

A pond with steep sides is a different problem for hedgehogs. Hedgehog Street’s garden advice, linked from their highways leaflet material we opened via the highways page, talks about a shallow edge or an escape route. Building the pond itself is covered by Pond Setup Guide, a separate site.

If you use a bird bath

Only put one out if you will change the water every day. The RSPB is firm about that. Shallow containers, including things like a dustbin lid or a plant saucer, can work. Clean and disinfect them weekly, on the same rhythm as feeders. See cleaning.

They advise tap water, because it is likely to protect against disease better than rainwater. There is an exception, and it depends on your water company:

• If your tap water is chlorinated, their default is tap water.
• If it is chloraminated, they say use tap water only in a bath that is off the ground. A bath on the ground should be filled with rainwater from a water butt that has a lid, so mosquitoes cannot breed in it.

How your water is treated is on the water company’s website, not on this one. We have not looked up individual companies.

In freezing weather, a pond or a bath that is solid ice is not a water source. The RSPB’s exception (“unless the pond has dried out or the water is frozen”) is when a bath earns its place again, still with a daily change once it is thawing.

When birds are ill

The BTO says leave baths empty until you are no longer seeing sick or dead birds. The RSPB’s longer pause for feeders is described in the cleaning guide. Water is part of the same stop, not a substitute for it.

What not to add

Nothing in the pages we opened suggests adding glycerine, salt or chemicals to stop a bath freezing. Salt is on the RSPB’s “do not feed” list because it dehydrates birds. We will not suggest an additive we have not seen recommended by them.

Do I have to provide water as well as food?

The RSPB says a regular supply of clean water is a good thing, and that a proper pond may already be enough. A neglected bowl, unchanged for days, is the thing they do not want.

Is rainwater better?

Not by default. They prefer tap water, except for a ground-level bath where the supply is chloraminated. Then they want rainwater from a lidded butt.

Can hedgehogs use the bird bath?

A deep, steep bath is a trap for a hedgehog. Hedgehog Street talks about shallow water and an escape from ponds. A shallow dish on the ground, changed often, is the pattern they describe for hedgehog water. Details are on the hedgehog page.