An in-ground irrigation system is one of the most valuable investments you can make in your lawn and landscape. It keeps your property green through dry stretches, protects newly seeded areas during establishment, and frees you from dragging hoses on summer evenings. But a system that’s installed correctly and then managed poorly will underperform, waste water, and cost more to maintain than it should.
At Mainely Irrigation, a Division of Just Grass, Inc., we service irrigation systems throughout the greater Bucksport, Maine area. We see the same mistakes repeatedly, and in most cases they’re easy to correct once a homeowner understands what’s happening and why. Here are the most common irrigation mistakes we encounter in Maine and what to do instead.
Mistake 1: Watering at Night
Running your irrigation system in the evening or at night feels logical. Temperatures are lower, there’s no midday evaporation, and you’re not competing with wind. But watering at night is one of the most reliable ways to invite fungal disease into your lawn.
When grass blades stay wet for extended periods overnight, it creates the exact conditions that fungal pathogens need to establish and spread. Dollar spot, red thread, brown patch, and pythium blight are all common in Maine lawns, and all of them are significantly more likely to develop in turf that goes to bed wet on a regular basis.
The fix is simple: set your controller to run in the early morning hours, between 4:00 and 9:00 a.m. Early morning air in Maine is typically calm and cool. Evaporation losses are minimal, so you get the efficiency benefit of low-evaporation watering without the disease risk that comes with overnight irrigation. The grass blades are wet as the sun rises and dry out naturally through the morning.
If your system is currently set to an evening start time, adjusting the controller schedule is a five-minute change that will have a meaningful impact on your lawn’s health over the course of a season.
Mistake 2: Watering Lightly Every Day
Daily irrigation feels attentive. Your lawn is getting water every single day, which seems like it should produce good results. In practice, frequent shallow watering is one of the main reasons lawns fail to develop the root depth they need to withstand summer heat and drought.
Roots follow water. When moisture is consistently available at the surface, grass roots have no incentive to grow deeper. Shallow-rooted lawns are far more vulnerable to heat stress, drought, foot traffic compaction, and disease than lawns with deep, well-established root systems.
The right approach for most Maine lawns is deep, infrequent watering: fewer cycles per week, but longer run times that push water deeper into the soil profile. Watering two to three times per week and running each zone long enough to wet the soil to a depth of 6 to 8 inches encourages roots to extend downward in search of moisture. That root depth becomes a genuine reserve during Maine’s summer dry spells.
A simple way to check your watering depth is to push a screwdriver into the lawn about an hour after a watering cycle. If it penetrates easily to 6 inches, your run times are in the right range. If it stops at 3 inches, run your zones longer. If the soil is saturated well past 8 inches, you’re likely overwatering.
Mistake 3: Running the Same Schedule All Season
Setting your irrigation controller in late May and leaving it untouched until fall winterization is a common habit, but it means your system is either over or underwatering for most of the season. The water needs of a Maine lawn change significantly from spring through summer through fall.
In late spring, cool temperatures and frequent rainfall mean your lawn needs relatively little supplemental irrigation. Running a full summer schedule in May can waterlog your soil, promote excessive top growth, and encourage disease.
In midsummer, particularly during July and August dry stretches, water demand peaks. Evapotranspiration rates climb as temperatures rise and humidity drops. A schedule calibrated for a mild June day may leave your lawn short during a hot, dry August week.
In early fall, grass enters its most active growth period of the year. Cool-season grasses like Kentucky bluegrass, fine fescues, and perennial ryegrass repair summer stress and build root reserves during September. Consistent moisture during this period is important for a strong finish to the growing season.
Review your controller schedule at least three times per season: once in late spring, once in midsummer, and once in late August as fall approaches. Adjust run times and cycle frequency to match actual conditions. If you have a smart controller, this adjustment happens automatically based on local weather data, which is one of the strongest arguments for the upgrade.
Mistake 4: Skipping the Professional Spring Startup
After a Maine winter, your irrigation system has been dormant for five to six months. Pipes have been empty, heads have been exposed to frost cycles, and the ground has frozen and thawed repeatedly. Simply turning the main shutoff back on and hoping for the best is a mistake that costs real money.
Frost heave is a consistent problem in the greater Bucksport area. Ground movement over winter pushes spray heads and rotors upward and out of position. An elevated head that isn’t reset to grade before the mowing season begins is going to get clipped by a mower blade, and replacement heads are far more expensive than an inspection visit that catches the problem early.
A professional spring startup also checks for cracked lateral lines and fittings that may have been stressed by freeze-thaw cycles, verifies that every zone is activating and shutting off correctly, inspects the backflow preventer, and calibrates the controller with appropriate spring run times. What you get is a system that’s confirmed to be working correctly from the first week of operation.
Homeowners who skip the startup visit and simply turn the water on often discover problems only after damage has accumulated. A zone that’s running with a cracked head may waste thousands of gallons before anyone notices. A valve that isn’t shutting off fully runs the meter continuously. Catching these issues at startup, before they’ve cost anything beyond the service call, is straightforward.
Mistake 5: DIY Fall Winterization with a Small Compressor
Of all the irrigation tasks that homeowners attempt themselves, fall winterization is the one most likely to result in expensive spring repairs. The issue is equipment capacity.
Properly blowing out an irrigation system requires a compressor capable of delivering 50 cubic feet per minute (CFM) or more for residential systems. Commercial systems need higher capacity still. The small pancake and portable compressors that most homeowners own typically produce 2 to 5 CFM, which is nowhere near enough to clear water from the lateral lines and valve bodies completely.
An undersized compressor can move some water but will leave residual moisture in fittings, valve diaphragms, and low points in the pipe runs. When that water freezes and expands, it cracks PVC pipe fittings, splits valve bodies, and destroys spray head internals. The repair bill in spring consistently exceeds the cost of professional winterization by a significant margin.
Mainely Irrigation uses commercial-grade equipment for every blowout. Our process clears each zone in sequence, verifying through multiple passes that heads are evacuating cleanly. We also drain backflow preventers correctly and winterize the controller, leaving the system in a protected state for the winter months.
Mistake 6: Ignoring Soil Type When Setting Run Times
Not all Maine soils absorb water at the same rate, and a schedule that works on one property can cause problems on another even if the systems are otherwise identical.
Sandy soils, common in coastal areas of Downeast and Midcoast Maine, drain quickly. Water passes through the root zone fast, which means the lawn dries out sooner than the same lawn would on heavier soil. Homeowners with sandy soils who run long, infrequent cycles may be delivering water faster than the soil can retain it, with much of it draining past the root zone before plants can use it. Shorter, more frequent cycles work better on sandy soils.
Clay and loam soils absorb water slowly. Running a spray zone for 30 consecutive minutes over clay often produces significant runoff because the soil can’t absorb the water fast enough. A cycle-and-soak approach works better: run the zone for 10 to 12 minutes, pause for 30 to 60 minutes for absorption, then run again. The total water delivered is the same, but runoff losses are substantially reduced.
When Mainely Irrigation commissions a new system or programs a controller at startup, soil type is one of the primary factors that shapes the recommended schedule.
Mistake 7: Mixing Head Types in the Same Zone
Spray heads and rotor heads apply water at very different rates. Spray heads typically apply 1.5 to 2 inches of water per hour. Rotors apply 0.4 to 0.8 inches per hour. When both types are present in the same zone and running on the same timer, one type will always be significantly over or underwatered relative to the other.
This situation usually arises when a system is expanded or modified without proper planning. A homeowner adds a few spray heads to a rotor zone because it’s the closest available zone, or a contractor installs mixed heads to save on zone wiring costs. The result is chronic coverage inconsistency that no amount of schedule adjustment can fully correct.
The right solution is zone separation: spray heads in one zone, rotors in another. Each zone can then be programmed with the appropriate run time for its head type, and every area of the lawn gets the right amount of water.
Mistake 8: Forgetting About the Backflow Preventer
The backflow preventer is one of the most important components in a residential irrigation system, and it’s the one that most homeowners never think about until something goes wrong.
A backflow preventer stops contaminated irrigation water from being drawn back into your home’s potable water supply. This can happen through back-siphonage when water pressure drops suddenly, a not uncommon event on municipal systems during nearby main breaks or firefighting operations. Without a functioning backflow preventer, irrigation water that has been in contact with soil, fertilizer, and pesticides could potentially enter your drinking water.
In addition to being a safety device, backflow preventers on systems connected to municipal water supplies typically require annual testing and certification under local regulations. If your system hasn’t been tested recently, that’s worth addressing. Mainely Irrigation can coordinate backflow preventer testing as part of your spring startup or fall winterization visit.
Backflow preventers also need specific attention during winterization. They contain internal chambers that hold water even when the system is shut off, and they require particular drainage procedures to be protected through the winter. This is another reason professional winterization matters.
Getting Your System Running Right
Most of the mistakes above are straightforward to correct. The starting point is a professional inspection that evaluates your current setup, your schedule, your soil conditions, and your system components and identifies what needs attention.
Mainely Irrigation serves residential and commercial properties throughout the greater Bucksport, Maine area. We’re a Division of Just Grass, Inc., and we bring the same commitment to honest, practical, locally-rooted service to every irrigation project and service call.
Call us at 207-702-9074 or contact us online to schedule an inspection or service visit. We stock common replacement parts and handle most issues in a single visit, so getting your system back on track is straightforward.