Why does sprinkler pressure change when the house is using water?
Short answer: Because the house and the sprinklers share the same water supply. Simultaneous water demands can reduce the flow and pressure available to an irrigation system.
Your home’s water supply can only deliver so many gallons per minute. When a shower, washing machine, dishwasher, or hose is running at the same time as a sprinkler zone, the total demand goes up and the pressure available to each use goes down. The sprinklers are usually the ones that show it first, because they need a steady pressure to throw their full pattern.
This is most noticeable on zones that are already near their flow limit, and at times of day when the house is busy — morning showers while the sprinklers run, or laundry during a watering cycle. The zone may look fine when the house is quiet and go weak the moment someone turns on a tap.
The practical fix is scheduling: run the sprinklers when the house is not using much water, usually early in the morning before showers and laundry. If the problem is severe, we check the zone’s total demand and the supply, because a zone that is over its limit will be sensitive to any other demand on the house.
What we check in New Caney
We check whether the pressure drop lines up with water use inside the house, and we measure the zone’s flow against what the supply can deliver. If the zone is marginal, we look at splitting it or changing nozzles so it has headroom. And we check the watering schedule, so the zones run when the house is quiet.
Related reading: Sprinkler Repair in Kingwood · All questions · Contact us
Frequently asked questions
Should I run sprinklers at night to avoid this?
Early morning is better than overnight — the grass dries as the sun comes up, which helps keep fungus down. The key is picking a time when showers, laundry, and dishwashers are not running.
Does this mean my water supply is too small?
Not necessarily. Most homes share one supply between the house and the yard, so some drop during simultaneous use is normal. It only becomes a problem when the zone is already at its limit.
Do you serve New Caney?
Yes. Orion’s Rain serves New Caney and the Lake Houston area — Kingwood, Atascocita, Porter, Humble, New Caney, Summerwood, Fall Creek, Huffman, and Eagle Springs. Call or text (281) 504-9998, 24 hours a day.
Related questions
- What is dynamic water pressure?
- Why doesn’t good static pressure guarantee a sprinkler system will work properly?
- Can too many sprinkler heads cause low pressure on a zone?
Get it looked at
If this sounds like your yard in New Caney, call or text Orion’s Rain at (281) 504-9998 — 24 hours a day. We will test the system and tell you what is actually wrong, and what it will take to fix it the right way.
Orion’s Rain Smartscapes and Exteriors — (281) 504-9998 — LI0029444