August is the make-or-break month for irrigation systems: temperatures peak, evaporation soars, and stressed lawns reveal every flaw in your watering schedule or hardware. Skipping maintenance now means higher water bills, brown patches by September, and costly repairs when winter arrives. According to the U.S. EPA, 14% of household water usage is from leaks — and most go undetected until pressure drops or runoff appears.
Priority Tasks
| Task | Time Required | Difficulty | Tools Needed |
|---|---|---|---|
| Inspect all sprinkler heads for clogs, misalignment, or breakage | 45–75 minutes | Easy | Screwdriver, rag, small brush |
| Test and recalibrate controller settings for current weather | 20–30 minutes | Easy | Smartphone (for weather app), controller manual |
| Check mainline and lateral lines for leaks or wet spots | 60–90 minutes | Moderate | Shovel, flashlight, pressure gauge |
| Clean filter screens on drip emitters and valves | 30–45 minutes | Moderate | Needle-nose pliers, vinegar soak container, soft brush |
| Flush lines and purge air from system | 25–40 minutes | Moderate | Wrench, bucket, garden hose |
Detailed Task Breakdown
Inspect and adjust sprinkler heads
Walk your entire zone slowly—look for sunken, tilted, or cracked heads. Rotate pop-ups manually to check for smooth operation. Use a screwdriver to gently realign nozzles away from driveways and siding. Replace any cracked bodies; don’t just cap them—water will pool and erode soil. For rotor heads, verify arc coverage matches your landscape’s shape—not your neighbor’s lawn.
- Mark damaged heads with spray paint before replacement
- Replace all nozzles older than 3 years—wear reduces output by up to 22% (Irrigation Association, 2022)
- Keep a log: note which head failed and why (e.g., “Zone 3, Head #7: sand-clogged, low-pressure arc”)
Recalibrate controller settings
Don’t run on last spring’s schedule. Pull current ET (evapotranspiration) data from your local weather station or use an app like RainMachine or Rachio’s seasonal adjustment feature. Reduce run times by 10–15% if rainfall exceeded 0.5 inches in the prior 7 days. Set start times between 4–6 a.m. to minimize evaporation losses—midday watering can waste up to 30% of applied water (University of Florida IFAS Extension, 2023).
Common Seasonal Problems
August heat accelerates wear and exposes design flaws. Watch for:
- “Dry circles” around trees—roots may have crushed lateral lines underground
- Uneven wetting patterns indicating valve solenoid failure or debris in diaphragms
- Chlorine odor near valve boxes—suggests backflow preventer seal degradation
- Water hammer noise during startup—often due to air trapped in lines or worn pressure regulators
"In August, a single leaking solenoid valve can waste over 6,000 gallons per month—more than many households use indoors." — Irrigation Association Field Technician Handbook, 2023
Tools & Supplies
Keep these on hand before you begin:
- Adjustable wrench and channel-lock pliers
- Replacement nozzles (match manufacturer specs: Hunter MP Rotators, Rain Bird 1800 series, etc.)
- Backflow preventer test kit (required annually in 32 states)
- Vinegar + warm water soak solution for emitter cleaning
- Pressure gauge (test at faucet and at farthest head—drop >15 psi signals line restriction)
How often should I flush my drip lines in August?
Flush monthly during peak season. Drip emitters clog fastest when water temperature exceeds 85°F and mineral content is high. Soak filters in white vinegar for 20 minutes before reinstalling—never use bleach, which degrades rubber seals.
Can I skip checking my backflow preventer in August?
No. Heat expands metal components and stresses rubber gaskets. Even if it passed inspection in April, thermal cycling may compromise seals. Test with a certified device—or hire a licensed tester if your state requires annual certification. See our full backflow checklist for step-by-step verification.
Why does my rotor head spin wildly but not cover the zone?
Most likely cause: worn gear drive or stripped internal gears. Don’t try to “fix” it with lubricant—it’s a symptom of age or grit intrusion. Replace the entire rotor body. Also check for low pressure (<30 psi at the head) using a gauge; if pressure is low, trace back to clogged filter or valve issue—not the rotor itself.
Is it okay to run irrigation during a drought advisory?
Only if your system meets local efficiency standards—and most older systems don’t. Cities like Austin and Los Angeles require smart controllers with weather-based adjustments for outdoor watering during restrictions. If yours isn’t certified, upgrade before next summer. Learn which models qualify in your municipality.
What’s the best way to find a hidden leak in my mainline?
Turn off all water in the house, then watch your water meter for 15 minutes. If the dial moves, you’ve got a leak. Next, shut off the irrigation main valve and recheck. If movement stops, the leak is in the irrigation line—not plumbing. Then isolate zones one at a time and listen at each valve box with a stethoscope or long screwdriver pressed to the ground. Wet soil + hissing = dig there first.
August isn’t just about keeping grass green—it’s about protecting your system’s longevity and your wallet. A 45-minute inspection now prevents $300+ in emergency repairs later. Keep your log updated, photograph problem zones, and cross-reference with your September gutter cleaning schedule—clogged downspouts often flood irrigation valves buried nearby.