What to Expect at an Irrigation Permit Inspection
An irrigation permit typically requires one or two inspections depending on your jurisdiction. Understanding what the inspector looks for — and preparing thoroughly — is the difference between a same-day pass and a costly re-inspection. Here is exactly what most residential irrigation inspectors evaluate.
Types of Inspections
Most jurisdictions require at least one inspection, and some require two:
- Trench / Open-Pipe Inspection (before backfill): The inspector examines the piping, fittings, and valve installation before you cover them with soil. This inspection is required by some but not all jurisdictions. If your jurisdiction requires it, you must call for this inspection before backfilling — inspectors will not excavate to inspect buried pipe.
- Final Inspection (after system is operational): The most common inspection. The inspector verifies the entire system is installed correctly, operational, and meets code. This is required virtually everywhere.
What the Inspector Checks at Final Inspection
Backflow Prevention Device
- Correct device type (PVB vs. RPZ per utility requirement)
- Proper elevation — PVB must be at least 12 inches above the highest sprinkler head in the system
- Above-grade installation — PVB cannot be buried or in a non-accessible enclosure
- Shut-off valves on both sides of the device, in working order
- Accessible for future testing — not obstructed by fencing, landscaping, or structures
Rain / Moisture Sensor (Required States)
- Rain sensor is present and wired to the controller (not just mounted separately)
- Sensor is installed in an exposed location that will receive actual rainfall
- Controller responds to sensor override — inspector may test this
Irrigation Zones
- No spray heads or drip emitters mixed in the same zone (matched precipitation rate requirement in Texas and other states)
- No overhead spray within 48 inches of impervious surfaces where required (Texas-specific)
- Heads operate correctly with no geysers, pooling, or dry spots observed
- Rotors and fixed spray heads are not on the same zone
Water Connection
- Connection to water supply is through the permitted tap point shown on the site plan
- No unauthorized connections to secondary water supplies or reclaimed water lines without separate permits
- No cross-connections between irrigation and potable water piping
Controller
- Controller is installed and operational
- All zones are wired and responding to controller commands
- Rain sensor override is connected to the sensor terminal
Most Common Inspection Failures
| Failure Item | How to Avoid It |
|---|---|
| Rain sensor not connected (or not present in mandatory states) | Install and wire sensor before scheduling final inspection; test override function |
| PVB not elevated 12” above highest head | Measure carefully; PVB must be above ALL outlets, not just most of them |
| Spray heads and rotors in the same zone | Zone separately by head type from the start — fixing this requires rewiring valve manifold |
| Backflow device buried or enclosed inaccessibly | Never enclose a PVB; ensure access panel if using a landscaping enclosure for RPZ |
| Work doesn't match site plan submitted with permit | If you changed zone layout during installation, amend the permit before inspection |
| Missing shut-off valves on backflow device | PVBs and RPZs must have fully functional shut-off valves on both sides |
How to Schedule Your Inspection
- Confirm inspection timing requirements. Some jurisdictions require 24–48 hours advance notice; others offer same-day or next-day windows.
- Have your permit number ready. You will need it when calling or using the online inspection request portal.
- Be present or have someone knowledgeable on site. The inspector will want to walk through the system and ask questions about zone layout and water source.
- Have the system fully operational. All zones should be wired, controller programmed, and system ready to demonstrate.
- Have the site plan from your permit application on hand. Inspectors often reference it during inspection.
The inspector will issue a correction notice listing the items that failed. You must correct the deficiencies and schedule a re-inspection — which typically incurs an additional fee ($50–$150). There is no limit on how many times you can re-inspect, but each visit costs money. Correcting the most common failures (rain sensor wiring, PVB elevation) is typically a 30-minute fix. Correcting zone design failures (mixed head types in same zone) can require re-running valve wiring and is significantly more disruptive.
In most jurisdictions, yes — the contractor who pulled the permit can be the point of contact for inspection scheduling and can be present on your behalf. This is standard practice for contractor-installed systems. If you pulled a homeowner/owner-builder permit yourself, you may be required to be present, depending on your municipality.
Related: Permit Cost Guide · Backflow Device Types · Rain Sensor Requirements