Spring Start-Ups & Calibration
First water of the season
done right, not just done fast.
After five months of dormancy through a Kootenai County winter, your irrigation system needs more than just a valve turned back on. Poly pipe joints shift in freeze-thaw soil. Rotor heads settle below grade. Sensor discs cake with mineral deposits. Controller programs set for last October's runtimes have nothing to do with a cool, wet May.
LP's spring startup service is a systematic inspection, calibration, and documentation process — not a tech turning on a valve and waving goodbye. We verify every zone works correctly before we leave your property, and we document what we find so you have a baseline record for the rest of the season.
A spring startup catches the damage
winter doesn't announce.
Prevents Wasted First-Month Water
Spring startup is the most expensive irrigation month for homeowners who skip calibration. A single broken rotor or clogged nozzle running 4–6 times per week for six weeks adds up to hundreds of gallons of wasted water before anyone notices a dry spot. LP catches every hydraulic issue before it compounds into a summer turf problem.
Catches Winter Damage Before High-Pressure Use
Poly pipe, PVC fittings, and valve bodies that cracked during a hard freeze may hold low-pressure air during a blowout but fail under full water pressure in spring. LP's pressurization sequence brings each zone up slowly, identifying damaged laterals before they become washed-out trenches or saturated plant beds.
Ensures Compliance Before the Season Begins
Annual backflow testing is an Idaho code requirement — not optional. Skipping it exposes homeowners to code violations and, more seriously, the risk of irrigation water contaminating a potable supply. LP ensures every system we start up has a current backflow test certificate on file before the first watering cycle runs.
LP Documents Your Zone Map
After every spring startup, LP provides a written zone map showing head placement, controller station assignments, and any adjustments made. When a head breaks mid-season, you'll know exactly what it is, where it belongs, and which valve controls it — or you can hand that sheet to whoever responds to the service call.
Six checkpoints, every system,
every spring.
System Pressurization Sequence
Rushing water back into a dry irrigation system after a North Idaho winter is one of the most reliable ways to crack fittings and blow poly pipe joints. LP opens the mainline shutoff slowly — a controlled quarter-turn at a time — and pauses to let pressure equalize before activating any zones. Each zone is then pressurized and visually checked before moving to the next, catching damaged laterals before they become flooded trenches.
Head Inspection & Adjustment
Six months of freeze-thaw cycling, soil movement, and vole activity takes a toll on heads. LP walks every zone to identify heads that have settled below grade (creating scalping points for mowers), clogged nozzles reducing precipitation rate, broken risers spraying at the wrong angle, and heads rotated off their original arc — especially common near driveways and hardscaping edges where foot traffic shifts them over winter.
Coverage Calibration
Head-to-head coverage — the industry standard for properly designed turf zones — requires that each head throws water to the next adjacent head. Rotors that have drifted off arc, nozzles that have been swapped to the wrong precipitation rate, or modified landscapes where new plants now obstruct spray patterns create dry spots that show up as dead turf by July. LP adjusts arc and radius on every rotor and verifies spray head throw distances match current landscape geometry.
Controller Program Review
A spring program is not a summer program. In late April and May, Post Falls and CDA lawns need significantly shorter runtimes than August — cooler temperatures, higher humidity, and less solar load mean the soil holds moisture longer. LP reviews and updates the controller schedule to match current seasonal conditions, adjusting watering days, runtime per zone, and start times to prevent waterlogging cool-season turf during spring establishment.
Rain & Freeze Sensor Verification
A rain sensor that was never properly commissioned — or whose disc has become mineral-caked over winter — provides false security. LP tests every sensor during spring startup: we trigger the bypass circuit manually, verify the controller responds correctly, check the sensitivity threshold, and confirm the sensor is mounted in an unobstructed location. A sensor that doesn't work is worse than no sensor, because it gives the homeowner false confidence.
Backflow Test Coordination
Idaho Plumbing Code requires all irrigation systems connected to potable water to have their backflow prevention assembly tested annually by a certified tester — before the first run of the season. LP coordinates RPZ and double-check backflow tests with certified testers as part of the spring startup process, ensuring your system is code-compliant before water flows through any zone. We document the test on file for your records.
Frequently Asked Questions
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