Why Is My Sprinkler System Losing Pressure?
When heads barely arc and your lawn isn't getting full coverage, pressure has dropped somewhere between your source and the heads.
Sprinkler systems lose pressure because of an underground leak, a clogged filter or backflow preventer, a failing pump, or a partially closed mainline valve. We perform a pressure test to isolate the section losing pressure, then quote a targeted repair instead of guessing.
Does this match what you're seeing?
If any of these describe your system, you're on the right page.
Here's what's usually going on, in priority order
We start at the most common cause and work down — the same way a real irrigation tech diagnoses.
Underground mainline or lateral leak
A break between the source and the heads bleeds off pressure before water reaches the lawn. Often invisible from the surface in sandy Miami soil.
Clogged pump filter or backflow screen
Algae, sand, and iron scale plug the inlet filter on well systems and the screen inside the backflow preventer on city water.
Partially closed mainline or backflow valve
After any service work, an isolation handle may not have been re-opened all the way. Easy to miss, easy to fix.
Failing pump or worn impeller
Pumps lose pressure as the impeller wears, the seal weakens, or the capacitor fades. On well systems this is the most common cause of slow, system-wide pressure decline.
Calcified or clogged nozzles
Mineral deposits restrict the small orifices on heads, especially on hard well water. Restoring nozzle flow often restores apparent pressure.
Real method, not guesswork
Every visit follows the same structured diagnostic so you only pay for what's actually wrong.
- Read static pressure at the source (meter or pump) with a calibrated gauge
- Measure dynamic pressure at the furthest head while a zone runs
- Pressure-test zones in sequence to isolate which one is losing pressure
- Inspect and clean filters and the backflow preventer screen
- Check pump amp draw and pressure switch settings on well systems
What we can do about it
Most of these problems have a repair path first. We only recommend replacement when it's the right call.
Repair paths
When replacement makes more sense
- Pump is more than 10-12 years old and has had multiple service visits
- Mainline has multiple recurring leaks (often indicates failing old poly pipe)
- Backflow preventer body is corroded or freeze-cracked
Why this looks different in Miami
Many Miami homes on well water see slow, year-over-year pressure loss as iron and sand erode pump internals. A yearly pump check catches this before zones start failing.
No two repairs are identical — here's what drives the price
We quote in person after diagnosis so you know exactly what you're paying for.
- Leak location depth and ground type (rock vs sand)
- Pump brand, horsepower, and whether the motor is reusable
- Whether the backflow needs full replacement vs cleaning
- Number of nozzles and head types that need to be swapped
Questions Miami homeowners ask
Real answers from the field, not boilerplate.
What is normal sprinkler pressure for a Miami home?
Most residential systems run 40-65 PSI static. Rotors need 35-45 PSI dynamic at the head; spray heads need 25-35 PSI. Below those numbers you'll see weak arcs and poor coverage.
Can low city water pressure cause my sprinklers to weaken?
Yes. If your home is at the end of a long lateral or you're running sprinklers during peak demand hours, supply pressure can sag. We can verify with a pressure-recording gauge over 24 hours.
How do you find a sprinkler leak without digging up my yard?
We isolate zones and pressure-test each one. Once we know which zone is losing pressure, we walk the line with a probe and listen for the leak. Most leaks are located within a small dig zone, not the whole yard.
Does a clogged filter really make that big a difference?
Yes. A single dirty pump filter can drop system pressure by 10-20 PSI — enough to take a rotor zone from healthy coverage to dribbling.
Let's get your sprinklers working right.
Same-week service across Miami-Dade and Broward. Free estimate, no pressure, no upsell on parts you don't need.