You just had a new irrigation system installed. The heads are working. The zones are running. And yet… your lawn still has brown patches.
I get this call more than you’d think.
And after 40+ years in this business, I’ve learned to start with five simple questions that uncover the real issue.
Because brown spots aren’t just ugly—they’re clues. And they almost always point to something deeper.
Let’s walk through the five questions I ask every homeowner when their lawn isn’t greening up the way it should.
1. Is Every Zone Covering What It Should?
This is the first thing I check.
Even a perfectly designed system can run into trouble if something is knocked out of alignment, gets buried by grass growth, or just wasn’t calibrated correctly.
What I look for:
- Are all heads popping up fully?
- Are they hitting the right areas?
- Are the nozzles matched and overlapping correctly?
- Is the spray pattern consistent from one head to another?
Common problems:
- Heads misaligned or buried under thatch
- Rotor nozzles not throwing far enough or spraying too far
- Spray heads blocked by overgrown plants or edging
I call these “invisible inefficiencies.” You can’t see them at a glance, but they quietly underperform week after week.
What we do:
- Run each zone manually during a site visit
- Adjust head heights and angles
- Swap nozzles for correct precipitation rates
- Flag any trouble spots for redesign or re-zoning if needed
Many brown spots come from what we call “gaps in the grid.” The water looks even from a distance, but it misses small sections repeatedly. Over time, those areas suffer. It’s the same as skipping part of a lawn when you mow—you’ll see the difference quickly.
2. Are the Run Times and Schedule Right for the Season?
A common misconception is that once a system is set, it doesn’t need adjustments. But watering needs change dramatically between spring, summer, and fall in the DMV.
Ask:
- Are you watering too early or too late in the day?
- Are zones running long enough for the time of year?
- Is the schedule being adjusted month to month?
In the DMV, July and August need more water than May and June. If your system still runs on spring settings during peak summer, it may not be enough to beat the heat.
What we recommend:
- 2–3 days per week in summer (more in extreme heat)
- Early morning watering (5–7am) to minimize evaporation
- 15–20 minutes per rotor zone, 8–12 minutes for sprays
- Cycle-and-soak for sloped lawns
For example, a lawn in Fairfax on clay soil needs shorter, repeated runs to soak in. Meanwhile, in Annapolis, sandy soil requires longer sessions with more spread-out intervals.
We also check smart controller settings—seasonal adjust percentages, weather data sources, and zone-specific programming. Sometimes, all it takes is activating seasonal adjust or fine-tuning one zone to make a huge difference.
3. Is the Soil Compacted or Hydrophobic?
Brown spots don’t always mean lack of water. Sometimes the water can’t get in.
Compacted soil is a common problem in heavily trafficked yards, or where clay is prevalent—like in parts of Bowie, Laurel, and Waldorf.
Signs:
- Water puddles but doesn’t soak in
- Lawn feels hard like concrete underfoot
- You can’t push a screwdriver in more than 2 inches
Causes:
- Heavy foot traffic or machinery
- Thick thatch layer
- Poor soil structure or heavy clay
- Lack of aeration
What we do:
- Recommend core aeration (spring or fall)
- Apply soil surfactants in extreme cases
- Adjust watering to soak more slowly, possibly using cycle-and-soak
- Instruct homeowners on testing infiltration rate with a simple can test
We often combine irrigation adjustments with a referral to trusted local lawn care providers who can perform aeration and overseeding.
Healthy soil is the foundation of a healthy lawn. Without it, no sprinkler in the world can save brown patches.
4. Is There a Hidden Leak or Pressure Issue?
Sometimes a brown patch isn’t a watering issue—it’s a distribution issue.
If there’s a break or slow leak in the line before the last few heads in a zone, those heads may not get the pressure they need to function correctly.
What happens:
- Water pressure drops across the zone
- Heads furthest from the valve don’t pop up fully
- You see misting or sputtering instead of a strong spray
- Sections of the lawn begin to dry out while others stay lush
How we check:
- Use pressure gauges and flow tests on each zone
- Visually inspect for soggy areas or pooling
- Check valve boxes and pipes for signs of leaks
We once had a homeowner in Silver Spring whose back lawn was consistently browning, even after increasing run time. The culprit? A small pinhole leak under a stepping stone. Fixing that one leak restored pressure and corrected the brown patch within a week.
5. Could It Be Something Other Than Irrigation?
Irrigation is usually the first thing we check—but it’s not always the problem.
Sometimes, the irrigation is working perfectly—and something else is to blame.
We’ve seen:
- Dog spots (urine burn from high nitrogen)
- Grub or chinch bug damage
- Fungus or brown patch disease
- Shading from trees or fences
- Soil pH imbalance or nutrient deficiency
- Heat stress from nearby walkways or driveways
How we help:
- Perform a visual lawn health check
- Recommend a lawn care partner for soil analysis or pest inspection
- Rule out irrigation before recommending further turf care
In one case in Alexandria, we traced recurring brown spots to reflection from low-E windows across the street. The sunlight was literally cooking one section of grass at midday.
Irrigation alone couldn’t fix it—but a combination of shade cloth, turf replacement, and adjusted watering helped reduce the stress.
Homeowner Story: Fairfax, VA
A family called us after replacing their old system with a new one. The system worked great—smart controller, matched precipitation, properly zoned.
And yet, patches of lawn still looked dull and dry.
We walked the yard and asked the five questions above.
Turns out: – One zone had a nozzle mismatch (1.5 GPM next to 3.0 GPM) – The controller was still set to spring watering times – The soil was compacted near the patio from lawn furniture and play traffic
We adjusted heads, updated the schedule to match summer heat, and recommended core aeration.
Three weeks later? Full recovery. The homeowner emailed a photo of their kids playing in the newly green yard.
What Happens When You Skip These Questions
Too many homeowners assume the system is broken—or blame the installer—when the issue is something simpler.
We’ve been called in to replace entire zones that just needed a schedule update.
Or to redesign lawns that actually needed aeration and grub control.
Asking the right questions saves you time, money, and frustration.
Final Word From Bob
When brown spots show up, don’t guess.
Start asking questions.
Because the system might be fine—or it might need a few simple tweaks.
And if it’s more than just irrigation, we’ll help you figure that out, too.
At TLC, we’ve been helping homeowners across the DMV since 1983. We know how to diagnose, adjust, and repair systems to bring lawns back to life.
Let’s walk your yard together, find the problem, and get it green again.
Bob Carr
Founder, TLC Incorporated
“Helping homeowners across the DMV since 1983”