For rainwater tank homes, a whole house system usually combines a fine sediment filter (5 micron or finer), carbon for taste and odour, and a UV lamp to disinfect bacteria and viruses. UV only works on clear water, so filtration comes first. The lamp is replaced yearly and the tank itself still needs regular maintenance.
- Tank water isn't treated by a utility.
- Sediment before UV, every time.
- Look for UV certified to NSF/ANSI 55.
A typical tank setup
| Stage | Why |
|---|---|
| Sediment 5 micron | Particles that would shield microbes from UV |
| Carbon | Taste, odour, some organics |
| UV (NSF/ANSI 55) | Bacteria, viruses, protozoa |
What does health guidance say?
The national enHealth rainwater guidance covers keeping roofs, gutters and tanks clean, first-flush devices and disinfection. Treatment complements tank maintenance; it doesn't replace it.
Which package fits?
Our Whole Home Pro adds UV for tank and bore homes. Pick 'Rainwater tank' in the water plan and we'll bring the right test kit.
Questions
Is rainwater safe to drink without a filter?
It can carry bacteria from roofs and gutters. Health guidance recommends maintenance and, for drinking, disinfection such as UV.
How often is the UV lamp replaced?
Every 12 months, even if it still glows.
Written by the Whole Home Water team and reviewed against the Australian Drinking Water Guidelines. General information only; your Home Water Check gives advice for your home.
Plumbing and installation details reviewed by a licensed plumber. See our editorial policy.