Texas doesn’t give commercial irrigation systems an easy life. Summer temperatures exceed 100°F for weeks at a stretch, driving evapotranspiration rates that push systems to run continuously. Spring soil movement cracks valve boxes and shifts heads. Freeze events in February can destroy hundreds of backflow preventers and valve actuators overnight. And drought cycling — periods of intense heat alternating with heavy rain — creates soil expansion and contraction that damages underground infrastructure over time.
Reactive maintenance — waiting until something breaks — is expensive. A failed valve that runs undetected overnight can mean thousands of gallons of waste and saturated turf. A failed zone that goes unnoticed for a week during summer means dead turf that costs tens of thousands to replace. Preventive maintenance doesn’t eliminate failures, but it catches problems early, when they’re inexpensive to fix.
Spring Startup: March–April
Spring startup is the most important maintenance event of the year. After a Texas winter — even a mild one — systems have sat dormant for weeks or months. Before you let the system run on its normal schedule, a systematic startup inspection verifies that everything is in order after the winter and establishes a baseline for the season ahead.
Start by pressurizing the system slowly. Don’t just turn on the water and let all zones run — surge pressure from rapid pressurization can damage solenoids, crack PVC fittings, and blow out sprinkler head seals. Open the main isolation valve gradually, allow the system to reach equilibrium pressure, and verify there are no obvious leaks at the main line before proceeding to zone testing.
Test every zone manually and walk each one while it runs. Look for broken or tilted heads, blocked coverage from new growth, heads that aren’t retracting properly, and coverage gaps. On 2-wire systems, check the controller error log for decoder communication faults that may have developed during the winter. Run decoder diagnostics if your platform supports it — this catches decoders that are receiving marginal voltage before they create zone failures during peak summer demand.
Backflow preventer inspection is critical in spring. Check the test cocks and relief valve for freeze damage, test the device if required by your water district’s annual testing requirements, and repair any issues before the system goes into regular service. Many water districts in Texas require annual backflow test certifications — spring startup is the natural time to schedule this.
Early Summer Check: May–June
The weeks between late May and late June are when irrigation systems in Texas go from moderate use to full demand. Evapotranspiration rates climb and turf water demand roughly doubles compared to spring. This is the time to verify that the system can actually deliver what the schedule requires.
Dynamic pressure testing is the early summer priority. Run a representative zone and measure operating pressure at the head. If it’s significantly below design pressure, you have a problem — either a supply pressure issue, a valve that’s not fully opening, or lateral pipe damage. Low pressure causes poor coverage, which shows up as irregular browning in turf weeks later. Catching it in May prevents the damage that appears in July.
Update controller scheduling for summer ET conditions. Many properties still have spring scheduling loaded in June — this consistently under-waters high-demand zones and over-waters shade zones. An ET-appropriate schedule can differ from a spring schedule by 30–50% in run times for sun-exposed turf areas. Work with your irrigation contractor to ensure scheduling is calibrated to current ET data for your location.
Midsummer Monitoring: July–August
July and August are the highest-demand, highest-failure months for Texas commercial irrigation. Heat stress on turf is severe, water demand is at its peak, and system components that are marginal from age or deferred maintenance tend to fail under the load. Regular monitoring — not necessarily a full inspection, but a regular system check — is essential.
Walk the property or have your facilities staff walk it weekly during July and August with a specific focus on catching turf stress early. Irregular brown patches, dry circles around sprinkler heads, or rows of wilting turf all indicate coverage problems. Log these observations and report them to your irrigation contractor for investigation. A coverage problem caught in July is a repair; ignored until September, it’s a turf replacement.
Monitor water consumption through your utility billing or property sub-meter if available. A sudden unexplained spike in consumption in July or August typically means a broken lateral, a stuck-open valve, or a head that’s been broken and is running continuously. These failures can cost thousands of dollars per day in wasted water before they’re discovered — regular consumption monitoring cuts discovery time dramatically.
Check controller flow sensor data if your 2-wire system has flow monitoring enabled. Modern controllers like the Hunter ACC2 and Rain Bird ESP-LXIVM log flow data by zone. Compare actual flow to expected flow for each zone. A zone running significantly over its expected flow suggests a broken head or lateral. A zone running under expected flow suggests a blocked head or failing valve.
Fall Transition: September–October
September and October bring cooling temperatures and reduced ET demand in Texas. Irrigation scheduling should transition down from peak summer run times — maintaining the same schedule into October wastes water and can create overly saturated soil conditions that promote fungal disease in some turf varieties.
Fall is an ideal time for repairs that were deferred during the summer because of system load or budget timing. Replace heads that were damaged over the summer, fix or replace valve actuators that are sticking, address any coverage gaps identified during summer monitoring. With lower temperatures, soil conditions are typically more workable for valve box access and minor excavation.
Begin preparing for freeze season. Identify any backflow preventers that aren’t in insulated enclosures and prioritize getting them protected before the first freeze risk. Locate and verify operation of any system drain valves. Confirm that freeze sensor or weather station inputs to the controller are functioning properly so automatic freeze shutoffs will work when needed.
Fall Shutdown: November
Texas properties don’t always need full system winterization the way northern climates do — in Houston and San Antonio, the ground rarely freezes hard enough to damage buried pipe. But above-grade components (backflow preventers, exposed valve bodies, above-grade pipe runs) are vulnerable to freeze damage even at temperatures that don’t affect underground infrastructure.
The key winterization tasks for Texas commercial systems: insulate or drain all above-grade backflow preventers, drain any above-grade pipe runs or pipe that’s installed in unheated structures, verify that automatic drain valves on the system are functioning, and reduce controller scheduling to match winter ET conditions or set it to the off-season mode.
Document the end-of-season system condition. Record which zones were repaired, which have known issues, what the flow sensor readings showed at shutdown, and any observations from the season that should inform next year’s maintenance plan. This documentation is the starting point for next year’s spring startup — it’s much easier to do a targeted inspection when you know what you’re looking for.
2-Wire Specific Maintenance Tasks
Standard irrigation maintenance tasks apply to any system. But 2-wire decoder systems have specific maintenance requirements that aren’t part of a standard irrigation technician’s routine. If your maintenance program doesn’t address these specifically, it’s incomplete.
Annual decoder diagnostics should be part of your maintenance contract. Most 2-wire platforms support diagnostic modes that test each decoder’s communication quality, output current, and solenoid response. Running a system-wide diagnostic catches decoders that are communicating marginally — they work today but will fail under summer load — before they fail during a critical watering window.
Wire path insulation resistance testing is a proactive way to identify wire path degradation before it causes faults. A megohmmeter (or insulation resistance tester) applied to the two-wire path measures the resistance between the wire conductors and the surrounding soil. Healthy wire shows high insulation resistance (typically several megaohms). Degrading insulation — from age, root intrusion, or physical damage — shows declining resistance. A reading that’s dropped significantly from the previous year is a warning sign that proactive wire path repair is needed before a full failure occurs.
Conclusion
A well-maintained commercial irrigation system in Texas has a service life of 20–30 years. A neglected one frequently needs major repairs or full replacement within 10–15 years. The difference between these outcomes is disciplined, season-appropriate maintenance that addresses the specific failure modes created by Texas climate conditions and 2-wire system architecture. The cost of a proper maintenance program is a small fraction of the cost of the failures it prevents.