An unused 1980s-era irrigation system was rebuilt from the water shutoff outward with new backflow protection, valves, controller, piping, heads and redesigned sprinkler coverage.

This three-zone sprinkler system in St. Clair Shores, Michigan had not been operated by the current homeowners in the five years they had lived at the property. Once we began bringing the irrigation system back into service, it quickly became clear that this was not going to be a simple sprinkler-head replacement.

Many of the components were decades old. Most of the original sprinkler heads carried date codes from the 1980s, the property was still equipped with a Rain Bird CRC-6A irrigation controller from the same era, the interior gate valve was stuck closed, there was no dedicated irrigation backflow preventer, and the original three-valve PVC manifold was cracked.

Underground, we also found deteriorated white nylon fittings, failed pipe connections, major root intrusion and areas where the original sprinkler layout no longer provided the coverage the lawn needed.

Rather than repairing one failure while leaving the next weak point immediately behind it, Hunter HydroTech worked through the system from the home's water supply outward and completed a full three-zone irrigation revamp.

Bringing an Irrigation System Back to Life After Years of Disuse

An older sprinkler system that has not operated in years should not automatically be considered either unusable or ready to run. There can be problems throughout the system that remain hidden until water is restored and individual zones are tested.

At this St. Clair Shores property, the homeowners had moved in approximately five years earlier and had never used the irrigation system. The system itself was much older, with numerous components dating back to the 1980s.

Our goal was not simply to make water come out of the existing sprinkler heads. We wanted to determine the condition of the water supply, backflow protection, controller, valves, manifolds, underground piping, fittings and individual zones so that the system could be rebuilt into something dependable and serviceable.

The First Problem Was a Gate Valve Stuck Closed

Before any sprinkler zone can be tested properly, the irrigation system needs a reliable water supply and a dependable way to shut that water off.

The original irrigation shutoff inside the home was an older gate valve that had become stuck in the closed position. Because the valve could no longer be operated reliably, we removed it and replaced it with a new ball valve.

A ball valve operates with a simple quarter turn and gives the irrigation system a much easier service point for future spring startups, repairs, winterization and emergency shutoffs.

With the water supply restored, we could continue rebuilding the irrigation plumbing outside.

Installing a Wilkins 710 Backflow Preventer

The existing irrigation system did not have a dedicated backflow preventer installed between the home's potable water supply and the sprinkler system.

We installed a new 1-inch Wilkins 710 backflow preventer to provide backflow protection for the irrigation connection.

Backflow protection is important because sprinkler piping, valves and heads are connected to an outdoor system that is exposed to soil, fertilizers, standing water and other contaminants. A properly installed backflow assembly helps protect the potable water system from reverse flow through the irrigation connection.

While rebuilding this area, another failure in the original irrigation plumbing became apparent.

The Copper-to-PVC Connection Pulled Apart

The irrigation plumbing transitioned from copper into PVC near the original manifold. During the backflow work, the old glued connection pulled out at the PVC elbow and male-adapter connection.

That failure demonstrated why this project needed more than cosmetic upgrades. A fitting may appear intact while a system is sitting dry, but placing it back into service can expose weak glue joints, brittle fittings and other hidden problems.

Instead of attempting to reuse a connection that had already separated, we rebuilt the transition as part of the new plumbing installation.

The Original Three-Valve PVC Manifold Was Cracked

The next major problem was the valve manifold.

A sprinkler manifold distributes water from the irrigation main into the individual zones. On this property, the original three-valve PVC manifold was cracked.

A manifold failure can affect the entire irrigation system because all three zones rely on that central distribution assembly.

We removed the damaged PVC manifold and replaced it with a new three-zone poly manifold using three 1-inch Hunter PGV-100MB irrigation valves.

This gave every zone a new control valve while replacing the cracked manifold with a configuration designed to be easier to service in the future.

Replacing the Rain Bird CRC-6A Controller

The original controller was another major piece of the system's history.

The property was still equipped with a Rain Bird CRC-6A irrigation controller dating back to the 1980s. Many of the sprinkler heads we removed from the system also carried date codes from that era.

An older controller can sometimes continue operating for decades, but this property was undergoing a substantial irrigation rehabilitation that included new valves, reconstructed piping, replacement sprinkler heads and redesigned zones.

We replaced the Rain Bird CRC-6A with a Hunter HPC-400 irrigation controller.

The new controller gives the restored system a modern control platform while eliminating another approximately four-decade-old component from the system.

Why We Replaced Every Sprinkler Head and Head Fitting

Throughout the property, the system contained old sprinkler heads and numerous white nylon irrigation fittings.

Those older nylon fittings are a common failure point in aging poly irrigation systems. Over time, the material can become brittle, fittings can break at the barb or tee, and poly pipe can work its way off an old barbed connection.

Installing a new sprinkler head on top of an unreliable decades-old fitting would leave a potential failure immediately underground.

For this project, we replaced the old sprinkler heads and rebuilt their connections rather than simply attaching new heads to questionable fittings.

We also used swing-style assemblies in rebuilt areas. A swing assembly provides flexibility between the lateral pipe and sprinkler head, helps isolate the buried line from movement at the head and makes future height adjustments or sprinkler replacement much easier.

A Major Root Restriction Destroyed Part of the Boulevard Zone

One of the most significant underground problems was located in the boulevard.

A large root system had grown around the irrigation lateral for approximately 25 feet. The roots had effectively swallowed the path of the original sprinkler pipe.

At one end of the affected section, the movement had pulled the poly pipe off its fitting. At the opposite end, the irrigation line had been pulled deeper into the ground and beneath the root mass.

This was far beyond a normal broken-fitting repair.

Trying to reconnect the existing pipe while leaving it trapped underneath the root system would not have created the type of repair we wanted to leave behind.

We opened the affected area, removed the necessary root obstruction and installed new irrigation line through the boulevard.

Rebuilding the Boulevard With Six Spray Heads

After reconstructing the damaged lateral, we rebuilt the boulevard coverage with six spray heads.

The new heads were connected using swing assemblies off the lateral line. This provides flexibility at each sprinkler location and improves long-term serviceability if a head is damaged, settles or needs to be raised in the future.

This section of the project is a good example of why underground irrigation problems cannot always be diagnosed based only on what is visible above the lawn.

A sprinkler zone that stops operating correctly may have a simple broken head, but it can also have piping that has been physically displaced by mature roots.

Converting the Front Yard From Sprays to Rotors

The original front-yard zone used spray heads. As part of the system redesign, we converted this section of the property into a rotor zone to provide better coverage across the lawn.

Rotor design involves more than simply choosing heads capable of throwing farther. The nozzle size, available flow, spacing and actual dimensions of the lawn all need to work together.

Several distances in this yard were only approximately 20 feet before the sprinkler pattern reached a sidewalk.

Rather than installing higher-flow nozzles and then heavily restricting the radius adjustment to force them into a shorter area, we used lower-GPM nozzles that better matched the dimensions of the lawn.

This also allowed us to use additional properly positioned heads while controlling the total flow demand of the zone.

Excessively reducing a rotor's radius adjustment can negatively affect the water pattern. Matching the nozzle to the required throw lets the rotor operate closer to its intended pattern while still keeping water where it belongs.

The result was a front-yard rotor layout designed around the actual shape and dimensions of the property instead of trying to force the old spray layout to continue doing a job it was not doing well.

Rebuilding the Side-Yard Spray Zone

The side-yard spray zone also required substantial reconstruction.

This zone extends through the side yard and into the left portion of the front yard. There were also sprinkler locations near the flower bed and fence that had ended up positioned inside the rock landscaping.

We moved those sprinkler locations out of the rock bed and into more appropriate positions where they could serve the turf and remain easier to access for future service.

The fittings were rebuilt and the new spray heads were installed using flexible swing-style connections where appropriate.

Adding Coverage Across the Front Approach

Another portion of the lawn on the opposite side of the front approach did not have the coverage we wanted.

Instead of attempting to spray across the concrete from a distant head, we went underneath the front approach/sidewalk and installed new 1-inch poly irrigation line to the area that actually needed water.

We added four additional spray heads to improve coverage in these areas.

A side-strip nozzle was also used where the lawn geometry called for a long, narrow watering pattern.

Strip nozzles are useful for narrow sections of turf because they apply water in a rectangular pattern rather than trying to use a conventional circular spray pattern in an area that does not match it.

By bringing the irrigation piping to the turf instead of trying to throw water across the approach, the new layout can water the lawn more directly while reducing unnecessary overspray onto concrete.

Why This Became a Complete Sprinkler System Revamp

There are many sprinkler repairs where replacing one head, valve or fitting is the correct solution. This property was different because major problems existed throughout the system.

The original interior water shutoff was stuck closed. There was no dedicated irrigation backflow preventer. The copper-to-PVC transition separated. The three-valve PVC manifold was cracked. The controller dated back to the 1980s. Many of the sprinkler heads were also approximately four decades old. Old nylon fittings remained throughout the system, and the boulevard lateral had been severely displaced by approximately 25 feet of root growth.

At the same time, portions of the original sprinkler layout did not provide the coverage we wanted from a rebuilt system.

Repairing only one of those problems would have left several others immediately behind it.

We therefore approached the project as one connected irrigation system, beginning with the water supply and working outward through backflow protection, valves, controls, underground piping and final sprinkler coverage.

What the Restored Three-Zone System Now Includes

• A new interior ball valve replacing the stuck gate valve.
• A new 1-inch Wilkins 710 backflow preventer.
• A rebuilt copper-to-irrigation plumbing transition.
• A new three-zone poly valve manifold.
• Three new 1-inch Hunter PGV-100MB irrigation valves.
• A Hunter HPC-400 controller replacing the original Rain Bird CRC-6A.
• Replacement of the old sprinkler heads and deteriorated head fittings.
• Flexible swing-style connections throughout rebuilt portions of the system.
• Approximately 25 feet of boulevard piping reconstructed after severe root intrusion.
• Six spray heads serving the rebuilt boulevard zone.
• A redesigned front-yard rotor zone using lower-flow nozzles matched to the shorter watering distances.
• A reconstructed side-yard spray zone.
• Relocated sprinkler heads that had previously been positioned in the rock landscaping.
• New 1-inch poly line installed underneath the front approach.
• Four additional spray heads providing coverage to previously underserved turf.
• Targeted side-strip coverage for narrow grass areas.

Can a Sprinkler System From the 1980s Still Be Restored?

In many cases, yes.

The age of an irrigation system by itself does not determine whether every underground component needs to be abandoned.

The more important questions are whether the water supply, wiring, main line, lateral piping and other portions of the original system remain usable and whether replacing failed components makes practical sense.

This St. Clair Shores system had extensive problems, but there was still enough of the original infrastructure to make rehabilitation worthwhile.

Instead of installing an entirely new irrigation system from scratch, we were able to rebuild the damaged and obsolete portions while redesigning the zones that needed improved coverage.

What Happens When a Sprinkler System Sits Unused for Years?

A dormant irrigation system can develop or conceal multiple problems.

Valves can seize. Old fittings can become brittle. Glue joints can weaken. Tree roots can move underground piping. Sprinkler heads can settle or become damaged. Controllers can become obsolete, and the landscaping around the original sprinkler design may change significantly over time.

Some of those issues will not become visible until water pressure is restored and the zones are operated.

That is why we prefer to evaluate an older dormant system from the beginning of the water supply outward rather than immediately replacing whatever sprinkler head looks worst above ground.

The First Water This Lawn Had Seen From Its Sprinkler System in Years

Once the reconstruction was completed, the system could finally operate again.

The lawn was understandably stressed and dry after going years without being irrigated by the home's sprinkler system. That makes the initial operating photos from this project particularly useful: they document the point when the rebuilt irrigation system was finally putting water back onto the property.

As the system continues operating and the turf begins responding to consistent watering, the visual difference should become even more noticeable.

What St. Clair Shores Homeowners Can Learn From This Project

If you purchase a home with an old sprinkler system that has not been used for several years, do not automatically assume that it needs to be completely replaced or that it is safe to simply turn it on and walk away.

The condition of the system needs to be determined.

Start with the water shutoff and irrigation supply. Determine whether appropriate backflow protection is present. Inspect the controller, valves and manifold. Then operate and inspect the individual zones for leaks, broken fittings, root damage, poor coverage and other underground failures.

This property demonstrates why that process matters.

The visible 1980s controller and sprinkler heads told us the system was old, but some of the most important problems were underground: the cracked manifold, failed PVC connection, deteriorated nylon fittings and boulevard pipe physically displaced by tree roots.

Sprinkler Repair and System Revamps in St. Clair Shores, Michigan

Hunter HydroTech works on irrigation systems ranging from individual broken sprinkler heads and valve failures to extensive system revamps like this St. Clair Shores project.

Learn more about our sprinkler repair services, sprinkler valve repair, backflow replacement services and smart sprinkler controller installations.

You can also explore our sprinkler and irrigation services in St. Clair Shores, MI or view the complete Hunter HydroTech service area directory.

For older systems that have been sitting unused, the best repair plan begins with understanding the complete system. Once the actual failures are identified, the usable portions can be preserved while the damaged and obsolete components are rebuilt properly.