Irrigation Systems Care Guide for Minnesota Homes

Spring Start-Up Checklist

In Minnesota, most systems are safe to start up between late April and mid-May, once the risk of hard ground frost has passed. Follow these steps to wake your irrigation system up gently and avoid costly damage.

• 1. Inspect the backflow preventer and main line
  Confirm the backflow assembly and exposed piping are intact, with no visible cracks or leaks from winter.
• 2. Slowly open the main water supply
  Open the irrigation shutoff valve very gradually to allow the system to fill without a sudden rush of pressure.
• 3. Power on the controller
  Restore power, replace batteries if your controller uses them, and confirm the date and time are accurate.
• 4. Turn on each zone manually
  Run each zone for 2–3 minutes. Walk the property to look for broken heads, tilted heads, clogged nozzles, or obvious leaks.
• 5. Check spray patterns and coverage
  Look for water hitting hard surfaces, windows, and siding. Adjust heads so water stays on turf and plant beds.
• 6. Inspect drip and specialty zones
  Verify emitters are flowing, not spraying, and that drip tubing is intact and properly anchored.
• 7. Review your early-season schedule
  Set a conservative schedule (fewer days, shorter run times) until temperatures warm consistently.
• 8. Schedule a professional inspection
  For complex or high-value landscapes, a Sandvig Services technician can perform a full start-up, tune the system, and document any needed repairs.

How to Program Your Controller for Minnesota Seasons

Your irrigation controller is the brain of your system. Programming it correctly for our climate helps prevent overwatering, protects your plants, and keeps your water bill under control.

Early Spring (Late April – May)

• Watering frequency: 1–2 days per week, depending on rainfall.
• Run times: 10–20 minutes for spray zones, 20–40 minutes for rotor zones, 30–60 minutes for drip zones.
• Best time to water: Between 4–8 a.m. to minimize evaporation and disease pressure.

Summer Peak (June – August)

• Watering frequency: 2–3 days per week for established turf, more for new plantings as directed by your landscaper.
• Run times: Increase each zone by 10–25% as temperatures climb and rainfall decreases.
• Cycling: For sloped areas or heavy clay soils, use multiple short cycles (e.g., 2 x 8 minutes) instead of one long cycle to reduce runoff.
• Smart controllers: If you have a weather-based or Wi-Fi controller, confirm the location, Wi-Fi connection, and seasonal adjustments are set correctly.

Late Season (September – October)

• Watering frequency: Gradually reduce to 1–2 days per week as temperatures cool.
• Run times: Decrease run times by 25–50% compared to peak summer.
• Shutoff date: Plan to shut down and winterize the system before consistent overnight lows reach freezing.

Every property is unique. Sandvig Services can customize your controller settings based on plant material, soil type, sun exposure, and local water restrictions.

Mid-Season Maintenance & Head Adjustments

Even a properly installed system needs mid-season attention. Small adjustments can significantly improve performance and appearance.

• Trim around heads
  Keep grass and plant material from blocking spray patterns or preventing heads from popping up fully.
• Level sunken or tilted heads
  Heads should sit flush with the soil and spray perpendicular to the ground for even coverage.
• Clean or replace clogged nozzles
  If a head is misting, sputtering, or not reaching as far as its neighbors, the nozzle may need cleaning or replacement.
• Check for overspray
  Adjust arc and radius so water is not hitting sidewalks, driveways, or structures.
• Monitor pressure
  Misting, fogging, or very fine spray can be a sign of excessive pressure. Pressure-regulated heads or valves may be needed.
• Reassess run times
  After making adjustments, fine-tune zone times to match actual performance and plant needs.

Common Irrigation Problems & Simple Fixes

Some issues are easy for homeowners to spot and address. Others require professional diagnostics and repair. Use this list as a starting point.

• Dry or brown spots
  Possible causes: Clogged nozzles, misaligned heads, pressure issues, or inadequate run times.
  Homeowner fixes: Check and clean nozzles, adjust arcs, increase run time slightly.
  Call a professional if: Large areas are affected, or changes to one zone impact others.
• Wet or spongy areas
  Possible causes: Leaking heads, broken pipes, or excessive run times.
  Homeowner fixes: Look for visibly broken heads and replace if you are comfortable doing so; reduce run times.
  Call a professional if: The area remains saturated or you suspect a pipe or valve leak.
• System does not turn on
  Possible causes: Tripped breaker, controller issue, closed valve, or wiring problem.
  Homeowner fixes: Check the breaker, confirm controller power, and verify the main irrigation valve is open.
  Call a professional if: Zones still do not run, or they only operate manually.
• Zones running when they should be off
  Possible causes: Stuck valves, controller programming conflicts, or wiring issues.
  Homeowner fixes: Review and simplify programming, ensuring there are no overlapping schedules.
  Call a professional if: A zone runs constantly or comes on at random times.
• High water bills
  Possible causes: Undetected leaks, excessive run times, or outdated equipment.
  Homeowner fixes: Shorten schedules and monitor usage.
  Call a professional if: Bills remain high; a system audit can often pay for itself in water savings.

Fall Winterization & Blow-Out Process

Proper winterization is critical in Minnesota’s climate. Water left in your irrigation lines can freeze, expand, and crack pipes, valves, and heads. Sandvig Services uses commercial-grade compressors and proven procedures to protect your investment.

• 1. Schedule your blow-out
  Plan to winterize between early October and the first hard freeze. Our team books up quickly, so we recommend scheduling in advance.
• 2. Shut off the water supply
  The main irrigation shutoff valve inside your home or mechanical room is closed to isolate the system from your domestic water.
• 3. Connect the air compressor
  A professional-grade compressor is attached at the designated blow-out port, typically near the backflow preventer or main manifold.
• 4. Blow out each zone
  Zones are run one at a time while compressed air is introduced, pushing water out through the heads. Pressures are carefully controlled to avoid damage.
• 5. Protect the backflow preventer
  Backflow assemblies and exposed piping are drained and insulated as needed to protect against freezing.
• 6. Power down and label
  The controller is set to “Off” or “Rain Mode,” and any special notes about your system are recorded for a smooth spring start-up.

Because of the equipment and experience required, we strongly recommend having winterization performed by a qualified professional rather than attempting it yourself with a small consumer compressor.

When to Call a Professional

Partnering with an experienced irrigation contractor helps protect both your landscape and your time. Sandvig Services is here to support you with as much or as little help as you need.

• You prefer a turnkey experience for spring start-up and fall winterization.
• Your property includes newly installed or high-value landscaping you want to protect.
• You notice recurring dry or wet areas that do not respond to simple adjustments.
• Your controller, valves, or wiring are not functioning as expected.
• You are interested in upgrading to smart controls, high-efficiency nozzles, or drip irrigation.
• You would like a seasonal or annual maintenance plan with proactive inspections and adjustments.