Irrigation System Plumbing
Every irrigation system begins as plumbing: a tap into the home's water supply, a shutoff, a backflow assembly protecting the drinking water, and a pressurized line feeding the valves. That connection side, not the sprinkler heads and zone tuning, is where systems leak money, fail inspections and endanger the potable supply when neglected.
This page owns the plumbing side of irrigation: the point of connection, backflow protection, supply repairs and seasonal protection of the pressurized plumbing. Head patterns, zone coverage and controllers are landscape-contractor territory; where the system meets your home's water is where this platform works.
Signs You Need This Service
Plumbing-side irrigation trouble:
- The meter runs with irrigation off. A supply-side leak between the tap point and the valve manifold bleeds pressurized water day and night: invisible in the lawn, visible on the bill.
- A soggy zone that never dries. Persistent wet ground near the connection, the backflow assembly or the main line, as opposed to a single head's puddle, marks the pressurized side.
- Backflow assembly weeping or failing its test. Drips from relief ports, or the annual test report that says rebuild. This is the one component whose health protects the household's drinking water.
- Pressure complaints across all zones. Every zone weak at once points upstream of the valves: a partly closed shutoff, a failing pressure regulator, or a supply leak.
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Common Causes
Why the connection side fails:
- Winter finds the backflow first. The assembly stands above ground by design, making it the most freeze-exposed plumbing most homes own. Unwinterized systems sacrifice it almost annually in freeze country.
- Constant pressure, buried joints. The mainline never rests from street pressure; every buried fitting is a candidate, and soil movement votes yearly.
- Cross-connection built wrong. Systems tapped without proper backflow protection, or with the wrong device type for local rules, put fertilizer-laced water one pressure drop away from the kitchen tap.
- Age and amateur splices. Decades-old poly pipe, repairs made with mismatched fittings, valves buried without boxes: the archaeology a repair visit reads before trusting any of it.
Service Details & What's Included
The plumbing-side services:
- Point-of-connection work. New taps installed with an accessible shutoff and code-required backflow protection; aging connections rebuilt so the irrigation system can be isolated without touching the house main.
- Backflow service and rebuilds. The assembly protecting your drinking water gets its own dedicated pages (backflow preventer repair, replacement and testing), and the irrigation connection adds what is specific here: isolating the assembly properly, and the seasonal protection that keeps freeze country from replacing it every spring.
- Supply and mainline leak repair. Pressurized-side leaks located and repaired: the meter-spinning kind, distinct from a cracked sprinkler head's puddle.
- Seasonal protection of the plumbing. Fall shutdown of the connection side (supply off, backflow drained or protected) and spring re-pressurization done gradually enough to spare old fittings. Full-system blowouts of zones and heads remain irrigation-contractor work; the plumbing side is what this platform covers.
Frequently Asked Questions
Why does my sprinkler system need a backflow preventer?
Because irrigation water stops being drinking water the moment it leaves the tap point (it stands in lawns with fertilizer and pet waste), and any pressure drop in the street can pull it backward into your home's supply without a working backflow assembly. That is why the device is required, why it sits where it can be tested, and why its annual health matters more than any sprinkler head's.
Something is leaking near my backflow device. Is that an emergency?
Close the irrigation shutoff and it stops being urgent: the house keeps its water, only the lawn waits. Persistent weeping from relief ports usually means internals need a rebuild, which is routine service. The situation to take seriously is a freeze-split assembly in spring startup, which can jet serious water; the same shutoff is the answer while the visit is scheduled.
Who fixes what: plumber or irrigation contractor?
A workable split: from your home's supply through the shutoff, backflow assembly and pressurized mainline is plumbing-side work, this page. Zone valves outward (heads, coverage, controllers, drip lines) is irrigation-contractor territory. Leaks announce their side: meter movement with the system off is plumbing; a geyser at one head when a zone runs is landscape.
Do I really need to winterize the irrigation connection?
In any climate with real freezes, yes. The backflow assembly is above-ground plumbing that cannot be insulated into safety, and it is routinely the first casualty of the first hard night. Shutting the irrigation supply and draining or protecting the assembly each fall is cheap; replacing a split assembly each spring is the alternative subscription.
My water bill jumped in summer. How do I tell if irrigation is leaking?
Isolate it: with irrigation off at its shutoff, watch the meter. Movement means the house side, stillness means the leak lives past that valve. Then run the system zone by zone watching for the abnormal zone. A mainline leak shows as meter movement even with all zones idle, and that is the pressurized-side repair this page covers.
Sort the Supply Side
Describe where the system misbehaves (at the backflow, the bill, or everywhere at once) and whether it has a working shutoff. The plumbing side gets honest attention; lawn zones stay with your landscape contractor.
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