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Irrigation · FAQ

Irrigation FAQ

Most irrigation decisions come down to four questions: what install costs ($200-$700 per zone, five-zone suburban systems commonly $2,000-$3,500 per LatestCost), how long to water (about an inch a week including rain, set with the can test), whether a smart controller pays off (EPA WaterSense estimates up to 15,000 gallons a year saved versus a clock timer), and what local rules require for backflow testing and watering days. The expensive mistake is treating longer runtime as the fix for dry spots.

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40 questions answered

The three questions homeowners ask first

Answered in full here so you do not have to hunt. Everything else is grouped below.

How much does a sprinkler system cost in 2026?

LatestCost puts installation at roughly $200-$700 per zone (average near $350), with a five-zone suburban system commonly $2,000-$3,500. Homewyse’s May 2026 figures work out to about $1.04-$1.91 per square foot of covered area. Confirm backflow assembly, controller, sensors and permit are in the bid. See our irrigation cost guide.

How long should I run my sprinklers?

Use the can test, not a default schedule. EPA WaterSense suggests placing empty tuna cans in the zone and timing how long heads take to put half an inch in them; aim for roughly an inch of water a week including rainfall, adjusted through the season. Dry spots are almost always coverage problems - fix the head, do not drown the zone.

Is a smart controller worth it?

For most homes with irrigation, yes. EPA WaterSense estimates an average home can save up to 15,000 gallons a year by replacing a standard clock timer with a WaterSense labeled controller, and many utilities rebate them. Clock-timer homes use roughly 50 percent more water outdoors than homes without irrigation, per WaterSense.

This page answers the cross-cutting questions that do not live only on a cost or maintenance page - awkward ones about incomplete bids, skipping winterization, and why national “rules” for watering days do not exist.

Three patterns cause most waste: adding minutes to cure a coverage gap, never auditing an aging system, and assuming the controller is a shutoff when a valve fails open. EPA WaterSense estimates about 50 percent of residential outdoor irrigation water is wasted through overwatering and inefficiency.

Costs and schedules below use published 2026 ranges and WaterSense guidance. Your pressure, soil, plant mix and utility rules still decide the right answer - call your water provider once for restrictions, rebates and backflow rules.

This page answers 40 real homeowner questions about irrigation, grouped so you can skip to the stage you are in.

By topic

Cost and pricing

Each answer is self-contained. Where a deeper page exists, the last sentence links to it.

Usually zone count, head quality, controller type, trenching assumptions, and whether the backflow assembly, permit and sensors are included. Compare zone maps and inclusions, not totals alone.
LawnStarter puts winterization at about $59-$144 for most homeowners, scaling from roughly $50-$75 for one or two zones to $150-$250 for seven or eight. Spring reactivation runs about $45-$140.
Commonly about $75-$150 for a standard residential test, depending on location, device count and access. Whether annual testing is required is set by your state and water utility, not nationally.
LatestCost puts ongoing upkeep at roughly $50-$150 per zone per year, with labor about $60-$120 an hour. That is separate from winterization and backflow testing where required.
EPA WaterSense estimates a single broken sprinkler head can waste up to 25,000 gallons and $280 over a six-month irrigation season. Cheap head repairs are urgent, not optional.
Zones are the unit of design and pricing. Per-zone bids make two contractors comparable. Homewyse’s $1.04-$1.91 per square foot is a range check; zone count still drives the real number.

Hiring and quotes

Start with EPA’s WaterSense directory of professionals who completed a labeled certification program (audit, installation/maintenance, or design), then verify licensing with your state or locality and ask for a zone map from a recent job.
Zone count and per-zone price, head and nozzle types, controller model, backflow assembly, sensors, trenching assumptions, lawn restoration, permit responsibility and warranty. A lump sum with no zone map is incomplete.
Usually yes. Uneven watering is far more often a tuning problem - tilted heads, mismatched nozzles, stuck valves, bad programming - than a reason to replace pipe in the ground. An audit costs a fraction of an install.
Three written bids with the same zone intent and inclusions. Force each bidder to state zone count, device types and whether backflow is included so the totals are comparable.
The contractor runs every zone with you watching, shows head-to-head coverage, and hands over a zone map plus the controller program in writing. If nobody walks the yard with the system running, nothing was verified.
Document dry zones with photos or a can test, notify the company in writing, and give them a chance to cure under your contract. State contractor boards handle many disputes - we cannot give legal advice for your case.

The work itself

A group of sprinklers or emitters on one valve that run together. Zone count drives cost and scheduling. Spray heads and rotors apply water at different rates and should not share a zone.
A grouping of plants with similar water needs. EPA WaterSense is explicit that turf and shrub areas should always be separated into different hydrozones so one schedule does not drown one and starve the other.
Splitting a runtime into shorter intervals with breaks so water soaks in rather than runs off. WaterSense recommends it on clay soils and slopes. It is a schedule design, not a product upsell.
Running every zone, checking head-to-head coverage, measuring output, finding leaks and stuck valves, checking pressure, and reprogramming the controller for plants and soil. It is the highest-value service most systems never get.
Drip or emitters usually waste less on beds and foundation plantings; sprays suit turf designed for them. Mixing plant types on one spray zone is a common reason for overwatering shrubs to keep grass green.
Usually yes. Heads, nozzles, valves and controllers are replaceable; buried pipe is the expensive part you already own. Full replacement is a last resort, not a first quote.

Problems and emergencies

Almost always coverage: a tilted, sunk or blocked head, or mismatched nozzles in one zone. Sprinklers need head-to-head coverage. Extra runtime will not fill a gap - it overwaters everywhere else.
Usually not. Failed solenoids, broken wire splices and dead controller outputs are common and relatively cheap. Get a diagnosis before anyone quotes a redesign.
Close the irrigation isolation valve on the supply line - usually near the backflow assembly or where the line leaves the house. The controller alone will not stop a valve stuck open. If you cannot operate the isolation valve, shut the main.
Look for pooling or a permanently soggy patch when the system is off, and watch the water bill. WaterSense flags surface pooling as a sign of an underground leak. Call 811 before any digging.
Pressure is too high for the nozzles. Misting drifts away instead of landing on the lawn - pure waste. Pressure-regulating heads or a regulator fixes it.

After the job, maintenance and seasonal care

At minimum a spring startup and fall shutdown, plus seasonal walk-throughs of each zone. EPA’s inspect-connect-direct-select routine is a solid annual baseline for catching waste.
Ask a local contractor what freezes do to unprotected assemblies. In marginal climates a single hard freeze on an undrained backflow can crack it - repairs cost multiples of a $59-$144 blowout.
Zone map, controller program, valve locations, backflow test dates, model numbers and warranty paperwork. The next technician should not start blind.
Sometimes - if they include real zone checks, seasonal reprogramming and priority service, not just a filter wipe. Read what is included and whether visits are required for warranty language.
Landscapes generally need about an inch a week including rain, so July schedules overwater May. Adjust monthly or let a weather-based WaterSense labeled controller do it.

Uncomfortable questions worth asking

Often. A backflow assembly is required in most places to protect drinking water and is a common omission in a cheap total. An incomplete bid is not a bargain.
Ask for an audit first. Pipe in the ground is expensive to replace; heads, nozzles, valves and controllers are not. Redesign pitches on uneven lawns deserve a second opinion.
Only if your contract allows change orders that way. Get trenching assumptions in writing before work starts. Rock, roots and boring under hardscape are classic surprise line items.
They might - and so might the city during drought stages. Restrictions are local and change mid-season. Call your water provider and read HOA rules; do not trust a contractor’s guess.
No. Even smart controllers need correct zones, working heads and occasional inspection. WaterSense’s own maintenance steps exist because systems drift: heads tilt, nozzles clog, schedules go stale.
Honest limits

Questions where the honest answer is “it depends”

Jurisdiction, policy and house-specific questions. We give you the procedure for finding out, not a confident national guess.

What are my watering restrictions this week?

Only your water utility (and sometimes city drought rules) can say. Stages change during a season. Call them or check their current schedule - general websites go stale fast.

Do I need a permit for a new irrigation system?

Often for new connections, backflow assemblies or work in the right-of-way, but thresholds are local. Call your building department and water utility with the job description.

How often must I test my backflow preventer?

Set by your state and water utility, not nationally. Ask them for the required interval and approved tester list. Typical test cost is about $75-$150 where testing is required.

What rebate will I get for a smart controller?

Rebate amounts and eligible models are utility-specific and change. Check your water provider’s current program before buying - do not rely on a salesperson’s old flyer.
How to use this page

Getting a real answer, not a sales answer

A few rules of thumb that apply across almost every question above.

  • Diagnose before you reprogram Coverage problems need head and nozzle fixes, not longer runtimes.
  • Winterize every year in a freezing climate Cheapest insurance against cracked assemblies and valves.
  • Call your water provider once Restrictions, backflow rules and rebates in one conversation.
  • Price by zone with a map Comparable bids and honest scope changes start there.
  • Fix broken heads immediately WaterSense: up to 25,000 gallons and $280 per broken head per season.
Sources

Where these figures come from

Sources last checked

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Who wrote and checked this

Written by

The HomeMatchup Content Team

Editorial
Reviewed by

Michael Thompson

Senior Home Improvement Reviewer · 20 years

Senior technical reviewer.

Team-written. Second-person reviewed. Sources dated. Report a correction.

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