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Sprinkler Systems

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A sprinkler system is a hydraulic circuit, not a set of appliances. Water arrives at the property at whatever pressure and flow the network provides, and everything after that — pipe sizes, the number of heads on a zone, how far the last sprinkler throws — is decided by how much of that pressure is left by the time the water reaches the end of the line.

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Australians consistently misjudge the starting point, because the guarantee is at the boundary rather than at the sprinkler. The Sydney Water customer contract commits to supplying drinking water at the point of connection to its water system at a minimum pressure standard of fifteen metres head, and defines a low pressure event as pressure below that at the connection point for a continuous hour or more. Everything downstream of that connection point — the pipes, fittings and connected accessories — is the customer's system, and every metre of it costs pressure.

That is why an over-zoned system is the most common fault in Australian gardens. Too many heads on one valve means every head runs below its design pressure, the throw shortens, the pattern distorts, and the lawn develops the dry arcs and wet patches that people then try to fix by watering longer. Longer run times cannot fix a hydraulic problem, and under restricted watering windows there is often no extra time to give.

Measuring pressure and flow before anything is designed

  • Measure static pressure at an outside tap, because a design based on an assumed figure is a guess.
  • Measure available flow by timing how long the tap takes to fill a known volume, since pressure alone does not tell you how much water you can move.
  • Note the meter and service size, which caps the flow reaching the property no matter what the main pressure is.
  • Test at the time of day the system will actually run, because network pressure varies with demand.
  • Account for elevation: every metre the water has to rise across a sloping block subtracts from the pressure at the head.
  • Record it all in writing, because the zone plan is derived from these numbers and should be checkable against them.

Sprinkler types, and why they should not be mixed on one zone

  • Fixed spray heads deliver a lot of water over a short radius and suit small lawns and narrow strips.
  • Rotors and gear-drive heads throw much further at a lower rate, and suit larger open lawns.
  • Rotary nozzles sit between the two, applying water slowly, which helps on clay and slopes where runoff is the problem.
  • Drip and inline dripline belongs in garden beds, not on lawn, and operates at a different pressure again.
  • Mixing spray heads and rotors on one zone guarantees uneven watering, because their application rates are not comparable.
  • Pressure-regulating heads and check valves are worth specifying on sloping blocks, where low heads drain every time the zone shuts off.

Dry arcs, misting and the symptoms of a hydraulic problem

  • Dry crescents between heads, the classic sign that the throw has fallen short of the spacing the design assumed.
  • The last head on a line barely lifting, which means the zone is drawing more than the supply can carry.
  • Fine misting rather than droplets, which is what heads do when pressure is too high, and most of that mist blows away.
  • Heads on the low end of a slope weeping after the zone shuts down, which indicates missing check valves.
  • A zone that works alone but fails when another is running, meaning the controller is overlapping stations.
  • Water pooling at one end and staying dry at the other, which is a spacing and application rate problem, not a run-time problem.

Who may connect a sprinkler system to the water supply

Connecting an irrigation system to the drinking water supply is plumbing work, and it is regulated as such. New South Wales requires the right licence or certificate to carry out plumbing, draining or gasfitting work, and licensed plumbers may be required to submit Notices of Work, Certificates of Compliance and sewer service diagrams to meet legislative requirements. The Building Commission audits plumbing and drainage work across the main metropolitan areas, with inspection and enforcement delegated to councils and authorities in regional New South Wales.

The reason the connection is treated seriously is contamination: an irrigation network sits in soil, in contact with fertiliser and animal waste, and is connected to the same water the household drinks. Ask who is doing the connection, what licence they hold, and what paperwork you will receive. Every state runs its own licensing arrangement, so check your own regulator's public register rather than assuming.

Keeping a system delivering what it was designed to deliver

  • Run each zone manually once a season and watch it, which is the only way to see what the system is actually doing.
  • Straighten heads that have been knocked out of vertical by mowers, which throws the pattern off completely.
  • Clean or replace nozzles and filters, since a partly blocked nozzle changes both the rate and the pattern.
  • Trim grass back from around pop-ups so they clear the turf when they rise.
  • Check for a permanently damp patch, which is usually a cracked fitting or a valve that is not sealing.
  • Review the controller when the seasons change rather than leaving summer settings running through winter.
  • Confirm that any rain sensor is still working, because a failed sensor fails silently.

Where the money goes in a sprinkler installation

The visible parts are the cheap parts. Sprinkler bodies and nozzles are a modest share of an installation; the cost sits in trenching, pipe, valves and valve boxes, the controller and wiring, and the licensed connection at the supply end. That is also the order in which corners get cut.

The saving that costs most is under-zoning: splitting a garden into fewer zones than the hydraulics support reduces the number of valves, the wiring and the labour, and produces a system that never waters evenly. Ask any installer for the pressure and flow they measured, the number of heads per zone, and the assumed spacing. If they cannot produce those three things, they have not designed a system, they have laid pipe.

Sprinkler Systems: frequently asked questions

Why does my last sprinkler barely come on?

Almost always because the zone has more heads on it than the available pressure and flow can serve. Water pressure is guaranteed at the connection point — the Sydney Water customer contract, for example, sets a minimum standard of fifteen metres head there — and every metre of pipe, every fitting, every rise in level and every additional head after that point reduces what is left. The fix is splitting the zone, not running it longer.

Does a sprinkler system need a licensed plumber?

The connection to the drinking water supply does. New South Wales requires the right licence or certificate for plumbing, draining or gasfitting work, and licensed plumbers may need to lodge Notices of Work and Certificates of Compliance. Laying pipe and setting heads in your own garden is generally not the regulated part; joining it to the water service is. Check the licensing rules for your own state, since each runs its own arrangements.

Can I mix spray heads and rotors on the same zone?

No, and it is one of the most common faults in retrofitted systems. Spray heads apply water at a much higher rate over a shorter radius than rotors do. Put them on one valve and any run time that suits the rotors drowns the area under the sprays, while a run time that suits the sprays leaves the rotor area dry. Keep them on separate zones with separate schedules, and keep drip separate again.

Why is my sprinkler misting instead of spraying droplets?

Pressure at the head is too high for the nozzle. Misting looks impressive and waters poorly, because fine droplets evaporate and drift on the slightest breeze rather than landing where they were aimed. The remedies are pressure-regulating heads, a pressure-regulating valve on the zone, or the right nozzle for the pressure available. It is worth fixing, since it is one of the few irrigation faults that wastes water visibly.

How many zones should my garden have?

As many as the measured flow requires, which is a calculation rather than a preference. Each zone can only run the number of heads its available flow will support at their design pressure, and separate zones are also needed wherever plant types, sun exposure, slope or sprinkler type differ. A quote that offers fewer zones for less money is usually offering a system that will never water evenly, and no controller setting will correct it afterwards.

Sources

  1. Sydney Water: Customer contract and the minimum pressure standard at the connection point
  2. NSW Government: Plumbers and drainers, licensing and compliance paperwork

Written by the LokalMatch editorial team. Last reviewed 22 September 2026. How we write and check our guides

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What affects the cost of sprinkler system

Prices depend on the details of your project. We only publish price ranges when they’re backed by real LokalMatch quote data or reliable sources. Until then, here’s what usually changes the price:

  • Size of the yard and the scope of the design
  • Grading, excavation and drainage work
  • Hardscape materials, such as stone, pavers or wood
  • Plants, sod and soil
  • Access for machinery
  • Removal of old materials, trees or stumps
  • How often visits are scheduled for ongoing services

How to compare irrigation contractors before you hire

  • Choose a company that does the kind of work you need, since design, lawn care, tree work and hardscaping are different specialties.
  • For big projects, ask for a site plan or drawing before work starts.
  • Ask how they'll handle grading and drainage so water moves away from the house.
  • For tree removal or large pruning, look for a qualified arborist with liability insurance.
  • For ongoing services like lawn care or snow removal, get the visit schedule and what's included in writing.

Questions to ask irrigation contractors before you hire

  • Can I see a plan or drawing before you start?
  • How will you handle drainage and grading?
  • Will you have underground utilities located before you dig?
  • Does any of this work need a permit, such as for a retaining wall, fence or tree removal?
  • What plants or materials do you recommend for our climate and my yard's sun and shade?
  • Do you guarantee plants or sod, and for what conditions?
  • Can you show me proof of liability insurance?

When to call a pro for sprinkler system

  • Water that pools near the house or in the yard after rain
  • A tree that is leaning, cracked or has large dead branches over the house or a driveway
  • A retaining wall that is bulging, leaning or cracking

Sprinkler system permits and local rules

Some sprinkler system work needs a permit or has to meet local bylaws. Rules vary by municipality, so ask your pro whether a permit is needed and who will apply for it — and check with your city or town if you’re unsure.

Permits and licensing

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