An army of plumbers is fixing leaky taps and shower heads across Sydney for free in a bid to help households reduce their water bills and salvage the rapidly lowering dam levels.

With dams levels now below 50 per cent, the state government says every drop matters.

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"Already we've saved two and a half thousand megalitres of water - that's ten Olympic sized swimming pools - just by going out and helping families fix their leaking taps," Water Minister Melinda Pavey told 7NEWS.

The WaterFix program was launched just two months ago and already 2,500 residents have taken up the offer.

Included in the free service, the call out cost, up to three minor leaky tap repairs, a free outdoor tap replacement, and subsidised water-efficient showerheads.

Water restrictions have been in place since June, but as of this Sunday, fines of $220 for individuals and $550 for companies will be handed out to those who break the rules.

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