If you've ever copped a please-explain from a neighbour about running your retic on the "wrong" day, you'll know Perth takes its water seriously — and rightly so. We live in one of the driest capitals in the country, and the Water Corporation roster is how the West keeps a lid on water use through our long, hot summers.

Here's a plain-English rundown of how the rules work, and how to keep a healthy garden without falling foul of them.

How the Perth sprinkler roster works

Across the Perth and Mandurah scheme water area, sprinklers are limited to two rostered days a week. Your days are set by the last digit of your house number — so it's worth checking yours rather than guessing, because the odd and even numbers fall on different days.

A few things to remember:

  • The roster applies to automatic reticulation and sprinklers, not hand-watering.
  • You can hand-water any day with a hose fitted with a trigger nozzle, or use a watering can — handy for new plants and pots.
  • Bore (groundwater) users follow a separate roster and are identified with a bore water sign.

The winter sprinkler switch-off

From 1 June to 31 August, scheme water sprinklers are switched off completely across Perth, Mandurah and parts of the South West. Our cooler, wetter winters mean lawns and gardens simply don't need topping up, and the switch-off saves billions of litres each year.

It's the perfect window to service your reticulation so everything's sweet when watering resumes in spring — more on that below.

The daytime watering ban

Year-round, you can't run sprinklers between 9am and 6pm. Watering in the cool of the early morning or evening means far less is lost to evaporation, so your garden actually gets more benefit from every drop. Early morning is best — it lets foliage dry through the day and helps keep fungal problems at bay.

Staying compliant without losing your garden

Two days a week sounds tight, but with a few waterwise habits a Perth garden will thrive on it:

  • Apply a soil wetting agent. Our sandy soils are famously water-repellent. A wetter helps moisture soak in and reach the roots instead of running off.
  • Mulch, mulch, mulch. A good 50–75mm layer of coarse, chunky mulch keeps the soil cool and slashes evaporation.
  • Hydrozone your garden. Group thirsty plants together and keep waterwise natives on their own station so you're not overwatering the hardy stuff.
  • Fit a rain sensor or smart controller. A weather-based controller skips a watering after rain — no point watering when the heavens have done it for you.
  • Tune your retic. Blocked nozzles, dry patches and overspray onto paths waste water and can land you a warning.

When to call in the experts

If your system is older, patchy, or you're not sure it's set up for the roster, a professional reticulation service pays for itself in water savings and a healthier garden. We can audit your coverage, swap tired sprinklers for efficient ones, set your controller to your rostered days, and convert garden beds to low-flow drip.

The winter switch-off is the ideal time to get it sorted — book a service now and head into spring with a system that's compliant, efficient and ready to go.

Rosters and dates can change from season to season, so always confirm your current watering days on the Water Corporation website. When in doubt, give us a bell and we'll point you in the right direction.