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Most DuPage sprinkler systems run for 22 weeks a year and get inspected once. The inspection happens in May at startup and catches the obvious failures — broken heads, blown valves, frozen pipes. The subtler failures show up in July when the lawn goes patchy and you can't tell whether it's the system or the heat.
Walk the system at 6 a.m. on a Saturday in mid-May. Watch each zone run through one cycle. Twelve minutes per yard is enough. Here are the seven things to look for.
1. Misting heads
If a head is throwing fine mist instead of solid droplets, water pressure is too high for that head. The mist drifts on the wind and never lands where you need it.
The fix: a pressure-regulating insert in the head, $4 retail. Or a pressure-regulating sprinkler body if the whole zone is misting, $18–$28 per head installed. Misting heads waste 25–40% of zone water; this is the cheapest meaningful fix in any sprinkler audit.
2. Dry zones in mid-rotation
Related service
Sprinkler Systems
Install, repair, and winterize. Licensed irrigators, smart-controller upgrades, and a 5-year workmanship warranty on new systems.
See the service →Watch the head rotate through its arc. If the lawn at the 90° mark is getting water but the lawn at the 0° and 180° marks isn't, the head is throwing too narrow an arc. Either the head's nozzle is wrong, or the head itself is misaligned.
The fix: nozzle swap, $3 retail. Head re-alignment, no parts, 5 minutes of labor. If the head is throwing wrong because the spring inside is gone, replace the head — $24–$38 installed in DuPage.
3. Heads spraying the driveway, sidewalk, or fence
Wasted water on hard surfaces is the most visible failure on a sprinkler system. The water comes off the driveway, runs to the street, and ends up in the storm drain. Two things cause it: head drift over the season, and the original install put heads at the wrong spacing.
The fix: head re-aim, no parts. If the head is the wrong type for the zone (a fixed spray on a 30-foot run), upgrade to a rotor head — $42–$60 installed.
4. Wet spots that don't dry between cycles
A patch of lawn that stays wet for hours after the zone runs has either a stuck valve or a leaking head. Stuck valves are the more expensive fix.
The fix: leaking head replace, $24–$38. Stuck solenoid valve, $80–$140 installed (the valve itself is $20; the labor is digging it up). If the wet spot is over a manifold (where multiple zone valves cluster), the manifold is the suspect — $200–$450 to repair.
[!warning] Wet spots that move down-slope after a zone runs are usually a leaking lateral pipe — the supply line between heads. Lateral leaks cost $200–$600 to repair because the pipe is buried 6–8 inches deep and the leak is somewhere along its length. Diagnostic flush + leak detection adds $120–$180 to the bill before any repair.
5. Valve box water at the curb
Walk to the curb where the main shutoff valve sits. If there's standing water in the valve box, the main shutoff is leaking. Cost: $90–$180 to replace the shutoff valve, plus the cost of the water leaked since last inspection.
This is the failure that quietly inflates your water bill in winter. The DuPage homeowners we audit who run "high winter water bills" without explanation usually have a leaky main shutoff. Fix it once.
6. Brown patches in irrigated zones
If the lawn is brown in a zone that's getting watered, the zone isn't getting watered as much as you think. Most likely: a head is throwing 80% of its rated arc because of low pressure, the rotation speed is wrong, or the runtime is set lower than the zone needs.
The fix: zone audit. We use a catch-cup audit — set 6–8 collection cups across the zone, run the zone for 15 minutes, measure water collected per cup. The variance tells you whether it's a head problem (catches differ widely) or a runtime problem (catches are uniform but low). Cost: $120 for the audit.
7. Controller programmed for May running in July
A sprinkler controller programmed in May for May watering runs the same schedule in July when the lawn needs 60% more water. Most homeowners never adjust the controller after the spring program goes in.
The fix: a smart controller upgrade, $280–$480 installed. The smart controllers (Rachio, Hunter Hydrawise, Rain Bird ESP-Me) read local rainfall and seasonal evapotranspiration and adjust runtime automatically. Saves 15–25% on the water bill in DuPage; pays back in 2 seasons.
Or, a manual program-shift: every May 15, June 15, July 15, August 15. Add 5 minutes to each runtime in May, 10 minutes in June, 5 minutes in July, drop back in August. Free, requires you to remember.
What this all costs in 2026 DuPage
Standard 6-zone tune-up at startup: $185 (we included this in the residential program at the May visit). Adds: nozzle swaps ($3 each, 4–8 average), pressure-regulator inserts ($4 each, 2–4 average), one head replacement ($24–$38).
Total: $230–$310 in spring on a typical Aurora half-acre 6-zone system. Skip the tune-up and you'll spend $400–$700 in summer chasing brown patches that the tune-up would have prevented.
When to call us vs. DIY
DIY zone walk + nozzle swap + head re-aim: 90% of the audit list above is within reach of a homeowner with a screwdriver and a Saturday morning. The exceptions are valve repair (you need to know what's under the valve box), lateral leaks (you need leak detection), and controller programming (most homeowners don't). Schedule a sprinkler audit and we'll do the walk with you.
