Perth households are failing to observe sprinkler restrictions, with residents in the southern suburb of Baldivis named the worst offenders for the second year running.

There were 2,009 on-the-spot fines of $100 issued to people breaching scheme water restrictions across the metropolitan area in 2017.

Sprinkler flouters in Baldivis led the charge, where 475 fines for illegal use were handed out.

The north-eastern suburb of Brabham came in second with 299 infringements, followed by neighbouring suburb Aveley, where 199 households received fines.

By contrast, only 60 infringements for breaches of bore water restrictions were made last year.

Secret Harbour was the worst offending suburb, with 13 fines issued.

Nine households in Ellenbrook and six in Dianella saw those suburbs come in second and third place respectively.

Permanent sprinkler rosters have been in place in Perth since 2007, with scheme water users able to use sprinkler systems two days per week, either before 9am or after 6pm.

Bore water users follow the sprinkler roster but have one extra watering day.

'Watch your watering:' Government

Water Minister Dave Kelly says small reductions in Perth's water usage add up. ( ABC News: Jacob Kagi )

Water Minister Dave Kelly said while most people did the right thing, a number of households were not abiding by the sprinkler bans.

He said households could make big water savings by monitoring their sprinkler habits.

"Making sure that people are using the water on their gardens and not wasting it can deliver really significant savings," Mr Kelly said.

"Forty per cent of our precious drinking water goes onto our gardens, so if we can reduce that by even a percentage or two, that's a substantial amount that we can save over a year."

Mr Kelly said Perth was Australia's highest water-using city and the driest as a result of climate change.

"Perth is one of the places on the planet most impacted upon by climate change," Mr Kelly said.

"We used to get 300 billion litres of water flow into our dams every year through rainwater, now we are lucky if we get 25 billion litres.

"That's a massive reduction, all due to climate change, so our water resources are really precious."

The figures come as the Water Corporation targets water guzzlers in a $350,000 advertising blitz over autumn, amid concerns West Australians will become complacent with their water use over the season.

Top 10 suburbs for sprinkler roster infringements in 2017

Scheme water

1. Baldivis — 467 infringements 2. Brabham — 299 infringements 3. Aveley — 199 infringements 4. Piara Waters — 185 infringements 5. Byford — 175 infringements 6. Caversham — 142 infringements 7. Yanchep — 140 infringements 8. Treeby — 138 infringements 9. Banksia Grove — 135 infringements 10. Nollamara — 129 infringements

Bore water