Commercial Irrigation Repair

The components on a commercial system are mostly familiar: valves, solenoids, 24-volt field wiring, controllers, rotors and spray heads, mainlines and laterals. What changes is scale and consequence.

Scale means multiple controllers on one property, zone counts in the dozens, larger-diameter mainlines carrying more flow, longer wire runs with more places to fail, and manifolds serving areas that are physically far apart. A fault that would take twenty minutes to isolate on a six-zone house can take considerably longer when there are forty zones across three controllers and no documentation.

Consequence means the landscape is part of the property’s presentation, water is a line item somebody reviews, and a broken head spraying a walkway or a parking deck is a liability question rather than an annoyance. Repairs also have to happen around tenants, customers, traffic and mowing crews.

Symptoms homeowners notice

• Brown or dying turf in visible frontage or entry areas
• Several zones down at once across a large site
• Water running across sidewalks, parking lots or drive lanes
• A water bill increase nobody can account for
• Heads broken repeatedly in the same locations by mowers or vehicles
• Zones that no longer match the landscape after a renovation
• Multiple controllers with nobody certain which one runs which area
• Irrigation damaged by construction or utility work on the property
• A system with no documentation and no known valve locations
• Standing water or a washout suggesting a mainline failure

The most likely causes

• Mechanical damage from traffic and equipment. Mowers, vehicles, delivery trucks and foot traffic destroy heads on commercial sites at a rate residential properties never see, particularly at island edges and along walkways.
• Long wire runs failing. More distance and more splices mean more opportunities for open circuits, shorts and corroded connections. On large sites one bad common wire can take out a whole section.
• Construction and utility damage. Sign installation, paving, landscape renovation, fence work and utility trenching all cut irrigation. On active commercial properties this is a recurring cause rather than a rare event.
• Mainline failures at scale. Larger pipe under higher flow fails more dramatically. A commercial mainline break can move a lot of water and undermine hardscape quickly.
• Systems outgrown by the landscape. Renovations add beds, remove turf and change plant material, while zones stay as originally designed. The result is over-watered beds and dry turf on the same schedule.
• Controller and programming sprawl. Multiple controllers added over the years, programmed by different people, produce overlapping schedules and zones nobody can account for.
• Deferred maintenance compounding. Small faults left unaddressed on a large site accumulate into whole sections performing badly, and the eventual repair list is much longer than it needed to be.
• Backflow assembly problems. Commercial assemblies are often above grade and exposed, which makes them vulnerable to freeze damage and impact.

How a technician diagnoses it

• On a large site the hardest part of the job is knowing what is there, so documentation comes before repair.
• We start at the controllers: how many there are, where they are, what each one serves, and what each is programmed to do. Multiple controllers with overlapping or contradictory schedules are common, and on more than one site the fastest win has been simply establishing which controller runs which area.
• Then station-by-station electrical testing at each controller. Voltage at every station output and resistance on every field pair catalogues opens and shorts across the whole site in one pass, which is far more efficient than chasing individual complaints. On a forty-zone property this routinely finds faults nobody had reported.
• Valve locating does more work on commercial sites than anywhere else, because manifolds get paved over, buried under renovated beds, or simply lost between ownership changes. An inductive locator finds them from the wire rather than from a drawing that may not exist.
• Then zone-by-zone operation with someone watching: head condition, coverage, overspray onto pavement and walkways, pressure under load. And a meter test with everything off, which on a large site with a big mainline is the most valuable single test there is — commercial mainline leaks lose water at a rate that shows up fast on a bill.

What the repair involves

1. Map the system. Controllers located, zones assigned to areas, valve locations found and recorded. On undocumented sites this becomes a reference the property keeps.
2. Test all stations electrically. Voltage and resistance readings across every station at every controller, cataloguing faults site-wide in one pass.
3. Meter test for mainline loss. Everything off. On large-diameter commercial mainlines this is where the expensive, invisible losses turn up.
4. Operate every zone. Each zone run and watched for head condition, coverage, and overspray onto walkways, parking and drive lanes.
5. Prioritise the repair list. Faults sorted into what is losing water now, what is damaging the landscape, and what can be scheduled. Property managers get something they can budget against.
6. Repair with the site in mind. Work sequenced and staged around tenants, traffic, business hours and mowing schedules, with excavation kept small and backfilled promptly.
7. Rationalise the programming. Schedules rebuilt across all controllers inside the Georgia watering window, with overlaps removed and cycle-and-soak timing for clay soil and slopes.
8. Document and hand over. Zone map, valve locations, controller assignments and the outstanding repair list left with the property.

What affects the cost

Commercial work is quoted per site, because two properties with the same zone count can differ enormously in access, documentation and condition.

• Total zone count and number of controllers
• Site size and how far apart the irrigated areas are
• Whether documentation exists or the system has to be mapped from scratch
• How many valves need locating
• Mainline diameter and depth, which drive the cost of any mainline repair
• Access constraints: pavement, hardscape, traffic, business hours and tenant impact
• Whether work has to be done outside business hours
• Volume of deferred maintenance on the first visit
• Whether the landscape has been renovated away from the original zone design
• Backflow assembly type and condition

For published rates and general North Georgia market ranges by repair type, see the Georgia irrigation repair cost guide.

Does this repair require digging?

Some of it, unavoidably — but the scale of digging on a commercial site is exactly what careful diagnosis controls. Locating a valve or tracing a wire to the break before breaking ground is the difference between one small excavation and a trench across a frontage lawn.

Head replacement, nozzle work, controller repair and programming need no excavation. Valve work in accessible boxes is surface work. Digging is required for mainline and lateral repairs, buried valves with no box, wire breaks that have to be exposed, and new zones or system modifications.

On commercial sites we keep excavation tight, backfill and restore promptly, and coordinate anything that affects walkways, parking or visible frontage so the property is not left with an open hole through business hours.

How long does it take?

A single fault on a commercial system — a broken head, a solenoid, a station output — is usually no slower to fix than the residential equivalent once it has been found. Finding it is the variable, and on a large undocumented site that can be most of the visit.

Site-wide assessments on properties with dozens of zones are typically scheduled as a dedicated visit rather than squeezed into a service call, because the value is in testing everything in one pass. Larger repairs such as mainline work are scheduled with parts on hand and coordinated around site activity. We will give you a realistic window for the work rather than an optimistic one.

Should the water be shut off?

Knowing where the irrigation isolation valve is matters more on a commercial property than anywhere else, because a commercial mainline under pressure can move an enormous amount of water before anyone notices — and undermine hardscape, flood a parking area or create a liability while doing it.

If you see standing water, a washout, or water crossing pavement from an unexplained source, close the irrigation isolation valve rather than setting the controller off. The controller does not stop a mainline leak. Part of any site assessment we do is locating and documenting that valve, along with any sectional isolation valves, so whoever is on site at 6 a.m. can stop the loss without waiting for us to arrive.

Will leaving it alone raise the water bill?

On commercial properties the water bill is usually the first thing that gets noticed, because someone reviews it monthly. It is also where the losses are largest, since mainline diameter and flow are higher and a leak that would be moderate on a house is substantial on a commercial line.

The quiet, expensive faults are the same as residential but scaled: valves weeping into laterals around the clock, overlapping programs across multiple controllers running the whole site twice a night, heads watering pavement at 4 a.m., and mainline losses nobody can see. Any one of those runs continuously and shows up only as a number.

A site-wide station test plus a meter test is a fast way to convert an unexplained bill into a specific, prioritised repair list — which is generally what a property manager needs in order to get it approved.

North Georgia considerations

The commercial corridors we work in shape the job. Office, retail and multifamily properties along Peachtree Industrial and Buford Highway through Norcross, Peachtree Corners, Duluth and Suwanee, the Alpharetta and Johns Creek business districts north of the Chattahoochee, and the Gainesville and I-985 corridor all have significant irrigated frontage where appearance directly matters.

Slope and clay are the recurring technical issues. Much of this terrain is rolling, and commercial sites concentrate that into graded pads with steep transitions, retaining walls and large parking areas. Water applied faster than Piedmont clay can absorb it runs off onto pavement, where it is both wasted and a liability. Splitting run times into soak cycles and grouping heads by elevation addresses that better than adding run time.

Freeze exposure is the other one. Commercial backflow assemblies are frequently above grade and unprotected, and those are precisely the components North Georgia freezes break — short, shallow cold snaps that leave buried pipe alone but split anything exposed. Protecting them before the first hard freeze is far cheaper than replacing an assembly in January with the site’s irrigation offline.

Frequently asked questions

Related services

Where we do this work

Irrigation Medics covers Hall County and the Lake Lanier communities, the Gwinnett corridor through Duluth, Suwanee and Buford, and North Fulton and Forsyth. Rates are the same everywhere — see the full service area.