1) Dry patches in the same spots (even with longer run times)

This is often coverage, not fertilizer. Look for clogged nozzles, heads that don’t fully pop up, heads spraying into sidewalks, or poor “head-to-head” coverage where one sprinkler isn’t reaching the next. Extending run time can mask the problem, but it usually increases waste and can create soggy zones elsewhere.

2) A zone that won’t turn on (or only trickles)

Common causes include a failed solenoid, debris in the valve, a controller wiring issue, or a partially closed manual valve. If one zone is weak while others are fine, it’s usually a zone-specific valve or line issue rather than a whole-system water supply issue.

3) A zone that won’t shut off

This can indicate a valve stuck open, a damaged diaphragm, or debris lodged inside the valve. If water keeps running, shut off the irrigation supply to prevent flooding and landscape damage, then schedule service. This is one of those problems that can turn expensive fast if ignored.

4) “Geysers,” bubbling, or a suddenly soggy strip of turf

Those are classic signs of a broken head, cracked riser, or a split line. The faster you address it, the less likely you’ll deal with soil washout, settling, or larger excavations.

5) Spray drift, misting, or fog-like sprinkler output

Misting is often a pressure issue or a nozzle mismatch. Wind turns mist into wasted water. Correcting nozzles, pressure regulation, and head type selection can tighten coverage and reduce runoff.

Many local guidelines recommend scheduling sprinkler blowouts before hard freezes—often aiming for late October—with some Treasure Valley municipalities encouraging homeowners to finish by October 31 to reduce freeze risk. (barefootlawnsusa.com)

Monthly walk-through inspections help catch leaks and coverage issues early, and EPA WaterSense materials commonly promote regular system checks as seasons change. (epa.gov)

Backflow assemblies are a frequent cold-weather weak point because they’re often above ground; winterization helps reduce the chance of cracking during extended cold snaps. (treasurevalleyrepairs.com)

Step 1: Run one zone at a time and walk it

Watch for heads that don’t pop up, spray into concrete, spit dirt (often a sign of a broken seal), or leave a donut-shaped dry ring. Write down the zone number and what you see—this makes a repair visit faster and more accurate.

Step 2: Check for “silent leaks”

Look for consistently soft ground, muddy spots, or grass that’s much greener in one stripe. A small underground leak can run for weeks before it’s obvious—then show up as settling or a suddenly washed-out area.

Step 3: Clean one problem head (if it’s safe and accessible)

Turn the zone off, pull the head up gently, rinse the nozzle/filter, and re-seat it. If the head is buried, bring it to grade so it can spray properly and won’t be damaged by mowing.

Step 4: If a zone won’t shut off, stop the water

Shut off the irrigation supply and schedule repair. A valve that’s stuck open can flood a yard, damage mulch beds, and waste a surprising amount of water quickly.

Spring start-up (damage check + efficiency reset)

Turn water on slowly, run each zone, and fix broken heads before setting a “summer” schedule. If you see geysers, trench-like sogginess, or uneven arcs, it’s usually cheaper to correct it early than to chase brown spots all season.

Mid-season (coverage, runoff, and smarter run times)

If water is running down the sidewalk, your lawn isn’t getting the benefit. Tune arcs, adjust heads, and consider shorter cycles with soak time between cycles to reduce runoff on slopes and compacted areas.

Fall blowout/winterization (freeze prevention)

In the Boise area, many homeowners schedule blowouts in October through mid-November—before the first hard freeze—often aiming to be completed by late October for a safety margin. (barefootlawnsusa.com)

Backflow devices deserve extra attention because they’re often above ground and can crack during prolonged cold snaps if water is trapped inside. (treasurevalleyrepairs.com)

Related services that pair well with irrigation tuning: lawn aeration, grub control, and tree service.

How do I know if I have an underground sprinkler leak?

Look for a persistently soggy strip, a sunken area, unusually fast brown-out in one zone (from pressure loss), or water bubbling up near a head. If your meter shows usage when all water is off (and you’re comfortable checking), that can also be a clue.

When should I schedule a sprinkler blowout in Boise?

Many Treasure Valley recommendations place blowouts in October through mid-November, before the first hard freeze—often aiming for late October (including “before October 31” guidance in some local messaging). (barefootlawnsusa.com)

Why is one sprinkler zone weak while the others look fine?

That usually points to a zone-specific issue: a partially clogged valve, a cracked line on that zone, a failing solenoid, or mismatched nozzles causing pressure loss. A quick zone-by-zone inspection can narrow it down fast.

Is it okay to keep increasing run time when I see dry spots?

It’s better to confirm coverage first. Longer run times can create soggy areas, disease pressure, and runoff—while the dry spot stays dry because it’s not getting hit by water in the first place.

Why does my backflow device matter for sprinkler repair?

Backflow assemblies help protect the potable water supply and can be vulnerable to freeze damage because they’re often above ground. Proper winterization reduces the risk of cracks and springtime leaks. (treasurevalleyrepairs.com)