Property Managers: Should You Repair, Upgrade or Replace Your Irrigation System?

Broken heads, dry spots and rising repair bills could be signs of an aging irrigation system. Before you decide, you need to know how much water your landscape actually needs.

By Jon Peters, Founder and General Manager, Irrigation Managers. Former agronomist and Certified Crop Adviser, 33 years in irrigation and agronomy.

The proposal arrives. New controllers. New heads on a dozen zones. A mainline repair. A second contractor's quote recommends something different.

You manage the property, the budget, the board and the vendors, and irrigation is one of many things you are responsible for. Whether you know irrigation well or not at all, you play an important role in deciding what to spend, and in explaining to the board and the owners whether it will pay off.

If you manage an HOA, a condominium, an apartment community or a business campus, you may feel like you are chasing your tail. The repair bills keep climbing along with the water bills, and the landscape keeps getting worse. Each service visit fixes one problem and another one fails. Reducing water use matters, but it is rarely the only reason to act. Repair bills and the health of the landscape count too. This guide is for that situation.

Key Takeaways

The question is not whether to replace. It is what the system needs to keep the landscape healthy at a cost you can defend. Often the answer is a mix of repair, upgrade and replacement, done in the right order.
How a system is run changes how fast it wears out. Water moving faster than 5 feet per second in PVC pipe causes pressure surges that break pipe and valves.[^1][^2]
Mismatched repairs make a system worse with every visit. Every head on a zone has to apply water at the same rate; a replacement that doesn't match upsets coverage.[^3]
Irrigation is a standard reserve component, and it is usually replaced in phases, because systems rarely fail all at once.[^4]
Without a water-use target, every decision is a guess. You can't measure a proposal, or your current system, against anything.

Is it time to repair, upgrade or replace?

The real question is what this system needs to do its job, keeping plants healthy and the landscape vibrant, at a cost you can defend. Often the answer is a mix of repairs, targeted upgrades and phased replacement, done in the right order as a long-term plan that meets the board's goals.

Do I need new heads? New pipe? A new controller? Another booster pump? You can only answer that by understanding what is actually wrong.

Sometimes the answer is not equipment at all. Running the system correctly can slow failures and breakage in some cases, and it is worth finding out before you replace anything.

What are the signs a system needs more than another repair?

Climbing repair bills alongside a declining landscape, dry spots next to soggy ones, failures nobody catches, wiring faults, and water use that rises with leaks and breaks all point past the next service call.

Repair bills increase every season while the system and the quality of the landscape decline.
Dry spots next to soggy ones, and a seemingly endless list of broken heads, valves and other issues.
Valves that fail without anyone knowing, because the controller cannot be reached remotely.
Wiring faults that take out a zone, or the whole system.
Water use that climbs because of leaks and breaks. A break that releases 80 gallons per minute loses more than 115,000 gallons a day.

Rules matter too. Florida law requires automatic irrigation systems to have technology that interrupts watering when there is enough moisture, and requires contractors who work on a system to test it.[^5] Many cities add their own year-round rules. Pembroke Pines, for example, limits existing landscapes to two watering days a week and bans irrigation from 10 a.m. to 4 p.m.[^6] A broken pipe that runs off-schedule can turn into a code violation. Now the failing system is a compliance problem as well as a maintenance one.

[FOUNDER PARAGRAPH: Jon, one or two paragraphs from a site you have walked. See publisher's notes.]

What are the main parts of a commercial irrigation system?

Most systems share the same parts, in the order the water travels: the point of connection, the mainline, valves and laterals, heads and drip lines, wiring, and the controller. Knowing them makes any proposal easier to read.

Every site is customized, but this table is a quick reference for what each part does and how it tends to fail.

Part	What it does	How it fails or wastes water
Point of connection (POC)	Delivers pressurized water to the mainline	Undersized connection, pump or filtration problems, water quality
Mainline	Carries water from the POC to every valve	Breaks from pressure surges and age
Valves and laterals	Turn each zone on and off; feed the heads	Valves that fail partway and leak through the heads
Heads, nozzles, drip	Apply the water	Mowed off, run over, plugged, mismatched replacements
Wiring and connections	Carry signals from controller to valves	Wet or poorly made connections take out zones
Controller	Runs the schedule	Can't be adjusted or monitored without a site visit

Point of connection (POC). A point of connection is the water source plus all the equipment needed to deliver pressurized water to the mainline. A site may have one POC or several, and they can be very different. A pressurized municipal supply may need little more than a master valve and a flow meter. The size of the connection (1 inch, 2 inch, 4 inch or larger) limits how much water the site can use at once. A well, pond or other surface source needs a pump to pressurize the water, and sometimes sensors to manage salinity and other dissolved minerals. Water quality matters because debris plugs nozzles and dissolved minerals harm plants, so these sources also need filtration. Water suppliers may set limits of their own, and different POCs on one site can have different water costs.

Mainline. The mainline carries water from the POC to each valve. It may be glued PVC, PVC with rubber-gasketed joints (common on larger sites) or HDPE, and each has a different expected service life. NRCS plans irrigation pipelines for a minimum expected life of 20 years.[^7] A study of irrigation pipelines in Japan found that PVC breakage was the largest category of pipe breakage, and still increasing, driven by fatigue from repeated swings in water pressure.[^8]

Valves and laterals. A valve turns the water on and off for one zone, an area of the site watered by several heads or drip lines together. Depending on the make and model, the controller calls that zone a station. The pipes from the valve to the heads are the laterals. Most valves are electric and are turned on and off by the controller. A commercial site, even one with only a few buildings, usually has dozens of them, most installed the same year, so they tend to wear out in the same window.

Valves fail in many ways. One way to waste a ton of water is when they fail partway: they no longer close fully, and water leaks out of the heads on that zone. Spread across many heads, nobody sees a problem unless the system is monitored.

Heads, nozzles and drip lines. Heads and nozzles apply water from above, and drip lines deliver it at the roots. Everything downstream of a valve comes on and goes off together, so every head on a zone should apply water at the same rate.

Definition: precipitation rate. Precipitation rate is how fast a sprinkler head or nozzle applies water, measured in inches per hour.

If one head applies 1 inch per hour and another 1/2 inch, one area gets half the water, and running the valve twice as long to fix it floods the other. Heads, nozzles and drip lines all require constant maintenance, and a replacement that does not match upsets that balance. Heads get mowed off and run over. Subsurface drip is out of sight, so damage under mulch or soil is very hard to see, and nobody can tell whether each emitter is plugged or working. Flow readings are often the only way to identify problems quickly.

Wiring and wire connections. The wiring carries current and signals between the controller and each valve. A fault can take out a zone or many zones at once. Each valve also has a wire connection, usually in a valve box below ground in a very moist environment, and a connection that is not made properly will fail. A site can have hundreds of them, so proper connections are extremely important.

The controller. It turns each zone on and off on a schedule, and most cannot be adjusted without a site visit. An older control system may monitor flow and send alerts, but these systems can be expensive and very difficult to maintain, and may need updating too.

Facing a big irrigation proposal this budget season? Before you approve new equipment, find out how much water your landscape actually needs. That number tells you whether the problem is the system or how it is run. Request a Water Use Analysis →

Does how the system is run affect how fast it wears out?

Yes. Running water too fast through the pipe, running too many zones at once, and repairing with mismatched parts all speed up wear, and the larger the system, the bigger the effect. Fixing how a system runs can sometimes change what needs replacing.

Good management practices should be in place at every irrigation site. That is worth finding out before you spend.

1. Keep water velocity at 5 feet per second or less. UF/IFAS, NRCS and the ASABE standard for underground thermoplastic irrigation pipe all treat that as the design limit.[^1][^2][^9] Faster flow creates surges and pressure spikes (water hammer) that can break and damage pipe and valves, and it adds plain wear to the system. UF/IFAS gives an example: water moving 7 feet per second in Class 160 PVC can produce a surge of about 100 psi, pushing total pressure past the pipe's rating.[^1]

Definition: water hammer. Water hammer is the pressure spike created when moving water in a pipe is suddenly stopped or started, for example when a valve closes quickly.

2. Match the flow of the zones to the pipe. Pipe size sets how many gallons per minute can run at once. Each zone needs a certain flow, and the zones that run together must add up to less than the pipes can carry.

Pipe size	Capacity at 5 ft/s
2-inch	50 to 60 gallons per minute
3-inch	115 to 130 gallons per minute

Depending on pipe class (Schedule 40, Class 200, Class 160). Calculated by Irrigation Managers from standard inside diameters.

Some controllers can be programmed with the expected flow of each zone, limit how many zones run together, and flag a problem. Many cannot, so the schedule has to be set by hand to stay inside the pipe's limit.

3. Keep as-built drawings. An as-built drawing is a map of what is actually installed on a site and where. It means every new maintenance contractor knows what is there.

4. Write an irrigation maintenance specification. Spell out exactly which heads, valves, filters, pipe and wire connections belong on the site, how pumps are maintained, and how each repair is made. EPA's WaterSense guidance for commercial sites calls for replacement parts compatible with existing equipment and sprinklers with matched precipitation rates.[^3]

Matching heads is the one that gets missed most. A replacement head with a different precipitation rate than the others on its zone lowers uniformity of coverage quickly. When there is no spec, and every repair uses whatever head is on the truck, the system doesn't improve with each repair. It gets worse.

5. Inspect every year, and audit periodically. EPA recommends inspecting the system at least once a year, ideally at the start of the irrigation season, and a professional audit at least every three years.[^3]

How do you decide: repair, upgrade or replace?

Start with what is failing, how often, and why, then read three sets of bills together and walk the site. The deciding piece is a water-use target: without it you can't tell whether the problem is the system or how it is managed.

What is failing, how often, and why? Why matters, because a system that is not managed correctly wears out faster.

What do the bills show? Three sets of bills each tell part of the story, and together they may tell all of it.

Bill	What it can show
Irrigation repair and maintenance	Whether the same parts fail again and again
Landscape maintenance (often separate)	Replacement plants, turf repair, and other costs of poor watering
Water	Leaks, breaks, and use that doesn't match the landscape's needs

Walk the site, and look at the repair history, to see whether you are fixing the same things repeatedly.

Then there is the question every site needs answered: how much water does the landscape actually need?

Definition: water-use target. A water-use target is the amount of water a landscape needs over the irrigation season, broken down by month, built from the irrigated area and historical weather data plus the extra water the system must apply to overcome its own inefficiency.

It is not a guess, and it is not based on how much water you used last season, because last season's use may include waste.

All of the information above is important. But if you do not know how much water your landscape needs, you are guessing at everything. You cannot calculate a return on any investment under consideration. You cannot tell whether your current system is doing a good job, how bad a job it is doing, or whether the problem is the system or how it is managed.

Reserve study providers treat irrigation as a standard component with a predictable life. Because systems rarely fail all at once, replacement is usually done in phases.[^4] That fits most boards' budgets better than a single large project, as long as the phases come in the right order.

What should property managers do in the next 30 days?

☐ Pull 12 months of all three bills (irrigation repair, landscape maintenance, water) and put them side by side.
☐ List repeat repairs from the service history: same zone, same part, same problem.
☐ Ask for the as-built drawing. If there isn't one, that is the first gap to close.
☐ Ask whether a maintenance specification exists, and whether replacement heads match on each zone.
☐ Walk the site with the repair list in hand: dry spots, soggy spots, broken heads.
☐ Get a water-use target before approving any large proposal.
☐ Get it into the budget conversation now. HOAs, condominiums and commercial campuses draft next year's budget in Q4, and reserve studies plan irrigation work in phases.

How does Irrigation Managers help property managers decide?

Irrigation Managers builds a water-use target for your site first, then shows what the system needs to meet it: better management, targeted repairs, phased upgrades, or replacement.

Every zone on a property is its own microclimate. Sun, shade, slope, soil and plant material all change what it needs, and a single program across 80 zones is wrong in 79 different ways at once. Our approach is called AIM: Analyze, Implement, Manage.

Analyze. A Water Use Analysis maps the irrigated area and uses historical weather data to build a monthly water-use target, the foundation for measuring every proposal.
Implement. Controller programming and scheduling built from measured uniformity, plant demand, pipe capacity and the legal watering window.
Manage. 24/7 monitoring, fault and alert routing, ongoing adjustment to actual weather, and reporting against the target.

Service starts as low as $1 per zone per month, with full management and reporting as low as $5 per zone per month. Our team is led by a former Certified Crop Adviser and a Certified Landscape Irrigation Auditor, and we work directly with property owners and alongside landscape maintenance contractors.

Deciding between repair, upgrade and replacement is easier once you have a water-use target, because it gives you a foundation to measure success from. If you don't know your number, chances are you are over-irrigating. There is no obligation, and we are glad to walk you through it. Call 1.800.473.7673 or send a message.

Request a Water Use Analysis →

Next in this series, Part 2: the company that diagnoses the problem often sells the fix. How do you know the advice is right? [add link when live]

Frequently Asked Questions

Should I repair or replace my irrigation system?

It depends on what is failing, how often, and why. How the system is managed also matters, because poor management wears a system out faster. Often the answer is a mix: repair what is failing now and plan larger replacements in phases. Reserve study providers treat irrigation as a standard component that is usually replaced in phases. A water-use target, the amount of water the landscape actually needs each month, shows which spending is worth it.

How long does a commercial irrigation system last?

An irrigation system is made up of several parts, and each has a different lifespan. NRCS plans irrigation pipelines for a minimum expected life of 20 years. A study of irrigation pipelines in Japan found PVC breakage was the largest category of pipe breakage, driven by fatigue from repeated pressure swings. Valves, heads and controllers generally wear out sooner, so which parts are failing decides what to repair or replace.

Why does my irrigation system keep breaking?

Common causes are water moving too fast through the pipe, which creates pressure surges (water hammer); running more zones at once than the mainline can carry; wire connections that fail in wet valve boxes; and repairs made with heads that don't match the rest of the zone. Most commercial valves are installed the same year, so they also tend to wear out together. UF/IFAS, NRCS and the ASABE pipe standard all set 5 feet per second as the design limit for water velocity in plastic irrigation pipe.

My landscape gets worse even though we keep paying for repairs. Why?

Repairs that don't follow a written specification can make a system worse over time. Every head on a zone runs together, so if one applies 1 inch of water per hour and its replacement applies half that, part of the zone stays dry and running longer floods the rest. Valves that fail partway leak through the heads without anyone noticing unless the system is monitored. The fix is often a maintenance spec, matched parts, and a water-use target to measure the system against.

What is a water-use target?

A water-use target is the amount of water your landscape needs over the irrigation season, broken down by month. It is built from your irrigated area and historical weather data, plus the extra water the system must apply to overcome its own inefficiency. It is not a guess and not last season's use, which may include waste. Without one, you have nothing to measure a proposal, or your current system, against.

References

[^1]: Clark, G.A., and Haman, D.Z. Water Hammer in Irrigation Systems. UF/IFAS Extension CIR828, revised January 2022, reviewed December 2025. https://ask.ifas.ufl.edu/publication/AE066

[^2]: USDA Natural Resources Conservation Service. Conservation Practice Standard: Irrigation Pipeline (Code 430). November 2024. https://www.nrcs.usda.gov/resources/guides-and-instructions/irrigation-pipeline-ft-430-conservation-practice-standard

[^3]: U.S. Environmental Protection Agency, WaterSense. Water Efficiency Management Guide: Landscaping and Irrigation. EPA 832-F-17-016b, November 2017. https://www.epa.gov/sites/default/files/2017-12/documents/ws-commercialbuildings-waterscore-irrigation-landscape-guide.pdf

[^4]: Walter, T., PE. Landscaping and Irrigation: Are They Included In Reserve Studies? Reserve Advisors, August 2023, updated April 2026. https://www.reserveadvisors.com/?p=14253

[^5]: Florida Statutes, section 373.62, Water conservation; automatic sprinkler systems. https://www.flsenate.gov/Laws/Statutes/2011/0373.62 [confirm current year's statute page]

[^6]: City of Pembroke Pines, Florida, Code of Ordinances, section 50.35, Use of Water for Irrigation. https://codelibrary.amlegal.com [add direct section URL]

[^7]: USDA Natural Resources Conservation Service. Conservation Practice Overview: Irrigation Pipeline (430). September 2020. https://www.nrcs.usda.gov/sites/default/files/2022-09/Irrigation_Pipeline_430_Overview_9_2020.pdf

[^8]: Tanaka, Y., and Tsuda, K. (NARO Institute for Rural Engineering). The Countermeasure Method and Monitoring of Fatigue Failure of Irrigation Pipelines. Pipeline Technology Conference, 2018 (abstract). https://www.pipeline-conference.com/abstracts/countermeasure-method-and-monitoring-fatigue-failure-irrigation-pipelines

[^9]: ANSI/ASABE S376.3, Design, Installation and Performance of Underground, Thermoplastic Irrigation Pipelines (2016, reaffirmed 2020), as cited in UF/IFAS CIR828. Background: Humpherys, A.S., USDA Agricultural Research Service, How to get the most benefit from plastic pipe, IA, March 1976.