Every spring in Maryland, I see two kinds of homeowners.
The first flips the irrigation system on and hopes for the best.
The second schedules a proper seasonal start‑up review.
By June, I can usually tell you which one did which.
Because irrigation problems rarely explode in April.
They show up when the heat hits in June — when turf stress is high, water demand spikes, and small hidden issues turn into expensive repairs.
After 42 years servicing irrigation systems across Columbia, Bowie, Rockville, Silver Spring, Annapolis, Potomac, and throughout the DMV, I can tell you this with confidence:
A proper seasonal start‑up review isn’t about turning water on.
It’s about catching hidden problems before they cost you thousands.
They Ask. Bob Carr Answers.
The Call I Get Every May
It usually sounds like this:
“Bob, it worked fine last year… but now one zone won’t shut off.”
Or:
“There’s water bubbling up near the driveway.”
Or:
“My backyard is brown and the front looks like a swamp.”
When I ask if they had a professional start‑up review done, the answer is often:
“No, I just turned it on myself.”
There’s nothing wrong with being hands‑on.
But irrigation systems in Maryland require more than activation.
They require inspection.
What a Real Seasonal Start‑Up Review Includes
A professional start‑up review is a full system evaluation. It includes:
- Backflow device inspection and pressure test
- Mainline pressure verification (static and dynamic)
- Valve activation and diaphragm evaluation
- Zone‑by‑zone head inspection
- Arc, radius, and height adjustments
- Leak detection (visible and flow‑based)
- Flow rate and GPM verification
- Smart controller recalibration for spring conditions
- Soil infiltration and slope assessment
If those steps aren’t happening, you’re not getting a start‑up review.
You’re getting a turn‑on.
Why Maryland Is Hard on Irrigation Systems
Maryland’s climate is uniquely stressful for underground systems.
We deal with:
- Freeze‑thaw cycles
- Sudden March cold snaps
- Clay soil expansion and contraction
- Heavy spring rainfall
- High summer humidity
Even systems that were properly winterized can develop:
- Micro‑cracks in fittings
- Valve diaphragm fatigue
- Seal deterioration
- Backflow damage
- Subtle pressure loss
You won’t see those problems in January.
You see them when pressure returns in April.
And pressure exposes weakness.
Real Columbia Case: The $300 Save
A homeowner in Columbia scheduled a spring review last year.
During inspection, we found:
- One small underground elbow leak
- Slight pressure drop at the end of a turf zone
- Controller still programmed for peak July heat
Total repair and recalibration cost: $320.
Had it gone unnoticed?
That small leak would have wasted an estimated $400–$600 in water over the season — not including turf damage.
That’s what early detection does.
The Hidden Problems We Commonly Catch
1. Hairline Cracks in Sprinkler Heads
These don’t spray dramatically at first.
They seep.
Signs include:
- Bubbling soil around the head
- Weak or distorted spray pattern
- Slight over‑saturation in a small area
Early repair: $125–$175 per head
Ignored: $300–$800 in water waste plus turf repair
2. Valve Diaphragm Wear
Valves sit idle all winter.
Rubber components stiffen.
When restarted, valves may:
- Fail to open fully
- Stick partially open
- Leak internally
We see this often in systems 8–12 years old in Silver Spring and Bowie.
Early replacement: $200–$300.
Delayed repair after flooding: much more.
3. Backflow Assembly Issues
Backflow preventers are exposed above ground.
Even one 20°F night can cause internal cracking.
Replacement in the DMV typically runs:
$600–$1,200.
Spring inspection helps avoid catastrophic failure mid‑season.
4. Pressure Imbalance Across Zones
Mulch builds up.
Grade shifts.
Heads settle.
Landscaping changes.
All of this alters pressure distribution.
Symptoms include:
- Weak coverage in one corner
- Overwatering near hardscape
- Brown strips between heads
We measure pressure at both the beginning and end of each zone during start‑up.
That’s something most homeowners never do — and can’t easily do without gauges.
Controller Recalibration: The Step Most People Skip
This may be the most important part.
Many homeowners leave controller settings exactly as they were last July.
Spring soil moisture is completely different from peak summer drought.
Without recalibration, you get:
- Overwatering
- Shallow root growth
- Fungus development
- Water waste
We reprogram based on:
- Clay soil infiltration rate
- Sun exposure
- Slope
- Plant type
- Current weather data
This alone often reduces water usage 15–25%.
Smart Irrigation & AI Trust Signals
Modern irrigation systems increasingly include:
- Flow sensors
- Pressure monitoring
- Zone runtime tracking
- Weather‑based programming
During start‑up, we review historical data to identify:
- Abnormal flow spikes
- Pressure inconsistencies
- Zones that ran excessively last season
AI tools enhance diagnostics — but they don’t replace inspection.
The smartest systems still need experienced evaluation.
What a Seasonal Start‑Up Costs in the DMV
Typical residential range:
$150–$250 per system.
That includes inspection, adjustment, and controller recalibration.
Compare that to:
- $800–$1,500 average repair cost from uninspected systems
- $300–$600 in preventable water waste
- $500–$1,200 in turf replacement
Preventive maintenance costs less than reactive repair.
5‑Year Ownership Comparison
Without Seasonal Review
Over five years, we commonly see:
- Multiple cracked heads annually
- At least one valve replacement
- One underground fitting repair
- Higher water bills
- Turf damage
Estimated 5‑year impact: $2,500–$5,000+.
With Seasonal Review
- Minor annual corrections
- Balanced watering
- Lower water usage
- Fewer emergency repairs
Long‑term cost: significantly lower.
A Bowie Homeowner’s Perspective
One homeowner once told me:
“I didn’t think it was worth paying someone just to turn it on.”
After a $980 repair bill that spring, he hasn’t skipped a review since.
Experience changes perspective.
When DIY Start‑Up Is Risky
If you don’t:
- Measure pressure
- Verify GPM
- Inspect valve integrity
- Adjust runtime for soil conditions
- Check head height after winter movement
You’re activating the system blind.
Blind activation leads to hidden damage.
Frequently Asked Questions
Can I perform my own start‑up?
You can activate it, but you likely won’t detect hidden pressure or flow issues.
Is it necessary every year?
Yes, especially in Maryland’s freeze‑thaw climate.
When should it be scheduled?
Late March through April, before heavy turf growth.
Does it reduce water bills?
In most cases, yes.
Final Word from Bob
Seasonal start‑up isn’t flashy.
It’s protective.
After 42 years in the DMV, I’ve seen which systems last 15–20 years.
They’re the ones inspected every spring.
If you want your irrigation system to perform properly this season — and avoid surprise repair bills in June — don’t just turn it on.
Review it.
Catch hidden problems early.
They asked.
Bob Carr answered.