A sprinkler system is one of the more complex pieces of outdoor plumbing a Michigan home can have, and it is also one of the most neglected. Most homeowners turn it on in spring, run it through the summer, and assume the winterization blowout at the end of the season is the only maintenance it needs. That assumption produces cracked heads, soggy patches from underground leaks, backflow preventer failures, and supply line problems that accumulate quietly until something stops working or the water bill spikes without explanation.
Sprinkler system maintenance is not difficult when it is approached as a regular routine rather than a reactive response to visible problems. Most of the tasks involved are visual inspections and minor adjustments that any homeowner can complete. The outdoor plumbing components that connect the system to the home’s supply, the backflow preventer, the shutoff valve, the supply line running to the system, and the underground lateral lines, are the parts where a licensed plumber becomes the appropriate resource. This guide covers both sides of that equation so you know what to handle yourself and when to make a call.
Maintaining a sprinkler system year-round requires seasonal inspections to catch damaged heads and underground leaks early, proper water pressure management to protect the supply lines and heads, correct watering schedules that match actual lawn needs, and annual winterization that fully removes water from every zone before the first hard freeze. The outdoor plumbing connection points in the system, particularly the backflow preventer and the supply valve, deserve specific attention because failures there affect the home’s plumbing system, not just the irrigation.
Why Sprinkler Systems Need Year-Round Attention
An irrigation system runs thousands of gallons of water through underground pipes, zone valves, and spray heads over the course of a season. That volume of water, combined with the mechanical cycling of valves opening and closing repeatedly under supply pressure, creates wear on every component in the system. Heads get knocked by lawn equipment and settle out of position. Underground lines develop slow leaks at fittings that are invisible at the surface until the surrounding soil is saturated. Zone valves develop debris in the diaphragm that prevents them from closing fully, wasting water between irrigation cycles.
Michigan’s freeze-thaw cycle adds a layer of seasonal stress that irrigation systems in warmer climates do not face. Water remaining in pipes after the season ends freezes and expands, cracking lateral lines and fracturing the bodies of spray heads. According to the U.S. Environmental Protection Agency WaterSense program, outdoor water use accounts for as much as 30 percent of average household water consumption, and a significant portion of that is wasted through inefficient irrigation systems. Leaking heads, misaligned spray patterns that water pavement instead of turf, and systems running on schedules that ignore rainfall all contribute to that waste. Maintenance that catches those issues early is maintenance that pays for itself in a lower water bill.
Seasonal Maintenance Overview
The table below maps each season to the key outdoor plumbing and irrigation maintenance tasks for that period and the specific problems each task is designed to catch or prevent.
Sprinkler System Maintenance by Season
| Season | Key Outdoor Plumbing Tasks | What to Watch For |
| Spring | Reactivate supply valve; inspect backflow preventer; check for winter damage | Cracked heads, soggy spots, reduced zone pressure |
| Summer | Monitor water pressure; inspect for leaks; adjust schedule for heat | Dry patches, standing water, unexpected bill increases |
| Fall | Reduce watering frequency; schedule winterization blowout | Tree root intrusion signs, slow drainage near heads |
| Winter | Confirm blowout is complete; insulate backflow preventer or store it | Ice damage to above-ground components, supply line freeze |
Spring and the end of the season are the highest-priority maintenance windows. The spring reactivation check catches any damage that occurred during winter before the system runs a full season on compromised components. The fall winterization is the outdoor plumbing task with the hardest deadline, because missing the compressed air blowout by even a few days in Michigan can result in frozen pipes and cracked heads that require replacement before the following spring.
Tip 1: Inspect Heads and Zones at the Start of Every Season
The most reliable way to start a maintenance routine is to run each zone manually while walking the coverage area and observing every head. A head that does not pop up fully is either clogged or has a broken stem. A head that sprays sideways rather than in its intended pattern has a cracked body or a stuck nozzle. A zone that produces lower pressure than adjacent zones has either a partially closed valve, a clogged filter screen, or an underground leak that is diverting flow before it reaches the heads. Identifying these issues at the beginning of the season means fixing them before they run all summer.
Look at the ground around each head during zone operation. Soggy or saturated soil that is not in the direct spray pattern of any head indicates a leak at the fitting connecting the head to the lateral line, or a crack in the lateral line itself. These underground outdoor plumbing leaks do not produce a surface puddle immediately because the water disperses into the surrounding soil, but the ground in that area will be noticeably wetter than the rest of the zone. A professional plumber can locate and repair underground irrigation line leaks when visual inspection identifies the approximate area.
Tip 2: Clean Clogged Sprinkler Heads
Soil, lawn debris, and mineral deposits from Michigan’s hard water all accumulate inside spray heads over the course of a season and reduce the flow rate through individual nozzles. A head that appears to be functioning normally but sprays in a broken pattern or reduced arc has a partially clogged nozzle that cleaning restores to full function. Turn off the water supply to the zone, unscrew the head from its riser, and rinse the nozzle under running water to clear loose debris. A small brush or a toothpick clears mineral scale from the nozzle opening without damaging the orifice.
Filter screens inside the head body, which are located at the base of the head where it connects to the riser, catch larger debris before it reaches the nozzle. These screens accumulate sediment over seasons of use and should be rinsed during the annual inspection. A screen that is heavily clogged with mineral scale from hard water can be soaked in white vinegar for 30 minutes to dissolve the deposits before rinsing. Hard water scale accumulation in irrigation heads is a more pronounced problem in Michigan than in softer water regions, which is one reason annual head cleaning is worth adding to the routine.
Tip 3: Adjust Spray Patterns for Efficient Coverage
Irrigation heads that spray onto driveways, sidewalks, or the foundation of the home are wasting water and creating unnecessary outdoor plumbing stress by running longer to compensate for the coverage gap in the turf. Most residential spray heads have an adjustable arc that can be modified with a small flathead screwdriver to redirect the pattern away from hardscape and toward the lawn. Rotary heads have a similar adjustment for the arc range. Making these adjustments takes a few minutes per head and produces measurable reductions in water use when multiple heads in a zone have been spraying off-target.
Watering in the early morning, before temperatures rise and wind picks up, is the single most effective scheduling change for reducing evaporation loss from an irrigation system. Water applied during the heat of the day loses a significant percentage to evaporation before it reaches the root zone, requiring longer run times to deliver the same effective moisture. Switching to early morning watering and reducing run times to account for the lower evaporation rate delivers the same lawn health results for less water. Most irrigation controllers allow scheduling by zone and start time, and setting all zones to begin between 4 and 7 in the morning is the most efficient configuration for most Michigan lawns.
Tip 4: Check and Maintain Water Pressure
Water pressure that is too high stresses irrigation heads, causes misting from nozzles that should produce defined spray patterns, and accelerates wear on the zone valves and the outdoor plumbing supply connection. Pressure that is too low results in inadequate coverage, short spray distances, and heads that do not pop up fully. The correct operating pressure for most residential irrigation systems is between 30 and 50 pounds per square inch at the zone valves, and the supply pressure from the home’s outdoor plumbing connection should be within or slightly above that range.
A pressure gauge threaded onto a hose bib near the irrigation supply connection measures the static pressure from the home’s supply. If the reading is above 80 PSI, the irrigation system and the home’s plumbing fixtures are both operating under higher than recommended pressure. A pressure reducing valve installed on the main supply line by a licensed plumber brings the pressure to a range that extends the life of the irrigation system components and reduces the outdoor plumbing stress throughout the home. If pressure is low at the irrigation system despite normal pressure at indoor fixtures, a partially closed irrigation shutoff valve or debris in the backflow preventer is the most common cause.
Tip 5: Inspect the Backflow Preventer
The backflow preventer is the outdoor plumbing component that protects the home’s potable water supply from contamination by the irrigation system. It sits between the home’s supply line and the irrigation system and prevents water from the irrigation lines from flowing back into the drinking water supply if pressure drops in the main. Michigan requires backflow preventers on irrigation systems connected to municipal water supplies, and most local jurisdictions require annual testing of the device by a licensed plumber to confirm it is functioning correctly.
A backflow preventer that is leaking at its test cocks or relief valve is failing and needs repair or replacement before the next irrigation season. A device that has not been inspected in several years may have deteriorated internally without producing any visible external symptom, which is why annual professional testing is required rather than optional in most Michigan jurisdictions. The backflow preventer also needs to be insulated or removed and stored inside before the first hard freeze, as it is the outdoor plumbing component most consistently cracked by freeze damage in irrigation systems that were not fully winterized.
Tip 6: Upgrade to a Smart Irrigation Controller
A smart irrigation controller replaces a standard timer with a system that connects to local weather data and adjusts watering schedules automatically based on rainfall, temperature, and evaporation rates. A standard timer runs the same schedule whether it rained three inches yesterday or not. A smart controller skips scheduled watering after significant rainfall, reduces run times during cool periods, and increases them during heat events. The result is a lawn that receives appropriate moisture without the overwatering that a fixed schedule produces during wet stretches.
Smart controllers are available at most home improvement stores and connect to home Wi-Fi for weather data access. Installation involves replacing the existing controller wiring connections, which follows a standard configuration for most residential systems. The controller itself handles the programming once the zone wiring is connected and the location is set. For homeowners who are also updating the outdoor plumbing supply connection or replacing the backflow preventer, coordinating the controller upgrade with that service visit is the most efficient approach.
Tip 7: Winterize Before the First Hard Freeze
Winterization is the most time-sensitive outdoor plumbing maintenance task in the irrigation system maintenance calendar. Every lateral line, zone valve, and spray head that still contains water when the first hard freeze arrives is a potential failure point. The compressed air blowout method, performed by a licensed irrigation technician or plumber, pushes all remaining water out of every zone through the spray heads using a high-volume air compressor matched to the system’s pipe size. Each zone is blown separately until no water exits the heads, and the process is repeated if any zones produce water on the second pass.
After the blowout, the main irrigation shutoff valve is closed and the backflow preventer is either insulated in place with foam pipe insulation and a protective cover, or removed and stored indoors for the season. Above-ground components including any exposed risers and valve boxes should be checked for standing water and dried before temperatures drop. A Michigan winterization completed before mid-October for most of the lower peninsula provides a comfortable buffer before the risk window opens, and scheduling with a professional in September avoids the booking crunch that occurs as outdoor plumbing winterization demand peaks in October.
When to Call a Licensed Plumber for Sprinkler Issues
Most of the visual inspection, head cleaning, and scheduling tasks in this guide are DIY-accessible. The outdoor plumbing components of an irrigation system, the supply connection, the backflow preventer, underground line repairs, and the winterization blowout, are the areas where a licensed plumber is the appropriate resource. Underground leaks that cannot be located visually require professional leak detection equipment. Backflow preventer testing and certification is a licensed plumber task in Michigan. Any work that involves cutting into and rejoining the irrigation supply line or modifying the connection to the home’s potable water supply requires a licensed professional to meet code.
An annual professional inspection that covers the backflow preventer, the supply valve, and the overall system pressure gives homeowners confidence that the outdoor plumbing foundation of the irrigation system is in good working order. Pairing that professional inspection with the DIY maintenance tasks in this guide produces a system that delivers efficient, reliable irrigation without the hidden water waste and sudden failures that characterize systems that receive no attention between seasons.
Keep Your Sprinkler System Running With Aspen Plumbing Services
For the outdoor plumbing side of your irrigation system, including backflow preventer inspection and testing, supply line repair, underground leak detection, and winterization coordination, the team at Aspen Plumbing Services is ready to help. We serve homeowners throughout Jackson, Michigan and the surrounding areas with the full range of outdoor plumbing services that keep irrigation systems and all outdoor water systems performing reliably.
Contact Aspen Plumbing Services today to schedule your outdoor plumbing inspection or sprinkler system service.
Frequently Asked Questions
How often should I inspect my sprinkler system?
A full zone-by-zone inspection at the start of the irrigation season and again midseason is the recommended minimum. The start-of-season inspection catches any damage that occurred during winter before the system runs for months on compromised components. The midseason check identifies heads that have shifted from lawn equipment impact, zones that are losing pressure from developing underground leaks, and scheduling adjustments needed as temperatures peak. A professional outdoor plumbing inspection of the backflow preventer and supply connection should be done annually, typically at the start of the season.
What causes low water pressure in one zone of my sprinkler system?
Low pressure in a single zone while other zones perform normally almost always indicates a problem specific to that zone rather than the outdoor plumbing supply. The most common causes are a zone valve that is not opening fully due to debris in the diaphragm, a clogged filter screen in one or more heads on that zone, or an underground leak in the lateral line serving that zone that is diverting water before it reaches the heads. Running the zone and walking the coverage area to look for soggy soil, reduced spray distances, or heads that do not pop up fully points toward which of these causes applies.
How do I know if my irrigation system has an underground leak?
The clearest signs of an underground irrigation leak are an area of the lawn that is consistently wetter or greener than the surrounding turf without being in the direct spray pattern of any head, a zone that runs longer than it used to to achieve adequate coverage, and an unexplained increase in the water bill during the irrigation season. Running each zone individually and walking the area while looking for water seeping up from the ground, bubbling soil, or saturated patches away from the spray pattern confirms the location. A licensed plumber with leak detection equipment can pinpoint the break for repair.
What is a backflow preventer and why does it need annual testing?
A backflow preventer is an outdoor plumbing device installed between the home’s potable water supply and the irrigation system that prevents water from the irrigation lines from flowing backward into the drinking water supply. Michigan and most local jurisdictions require annual testing by a licensed plumber to confirm the device seals correctly in both directions. A backflow preventer that fails the test is allowing potential contamination risk and must be repaired or replaced before the irrigation system is returned to service. Testing takes about 15 minutes and produces a certification record that satisfies local compliance requirements.
Can I perform the sprinkler winterization blowout myself?
A compressed air blowout requires a commercial-grade high-volume air compressor that delivers significantly more cubic feet per minute than standard homeowner compressors. Using an undersized compressor does not remove all water from the lines and leaves enough moisture to cause freeze damage. Using a compressor that is too powerful can damage irrigation heads and valve diaphragms. For these reasons, the winterization blowout is one of the outdoor plumbing tasks best left to a licensed irrigation technician or plumber who has the correct equipment and can confirm every zone is clear before closing up for the season.
How do I adjust my irrigation schedule for Michigan weather?
Michigan lawns need approximately one inch of water per week from rain and irrigation combined during the growing season. During weeks with significant rainfall, the irrigation schedule should be reduced or skipped entirely. Most digital irrigation controllers have a rain delay feature that suspends scheduled watering for a set number of days. A smart controller eliminates the need for manual adjustments by connecting to local weather data and making those schedule changes automatically. During cooler periods in late spring and early fall, reducing run times by 30 to 40 percent compared to peak summer settings typically provides adequate moisture without overwatering.
Aspen Plumbing Services proudly serves the greater Jackson, Michigan area and the surrounding areas, including Holt, Stockbridge, & Dexter. Questions about outdoor plumbing or sprinkler system services? Contact our team today
