The 30-day clock
If your device fails, Loudoun Water gives you 30 days from its notice to repair and retest. Most failures are a rebuild kit, so we fix and retest on the same visit and the clock never starts.
Backflow testing · Loudoun County
Backflow testing in Loudoun County, on the clock and off your list.
Loudoun Water gives a failed device 30 days to be repaired and retested, and Leesburg wants residential irrigation results by June 1 every year. We test in about 30 minutes, fix failures on the same visit, and file the report so the deadline never becomes your problem.
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- VA Class A #2705192276
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Why you got the letter
Loudoun’s rules are a little stricter. Here’s what they mean for you.
Loudoun Water requires an annual test by a certified tester on every testable device, and it adds two rules most homeowners learn the hard way: a failed device has 30 days to be repaired and retested, and an irrigation device that was removed for winterization has to be retested when it goes back in.
Removed for winter? Retest.
Pulling the PVB indoors for the winter protects it from freezing, but Loudoun Water requires a new test when it’s reinstalled. Draining it in place and covering it avoids the extra test.
Leesburg’s June 1 deadline
Inside the Town of Leesburg, residential irrigation test results are due to the Town by June 1 every year, and a failed device needs a passing report within 15 days. Spring is the season to book.
What to expect
The test, start to finish
- 1
Book a window
Online or one call. Tell us how many devices you have and which utility sent the letter; commercial properties with a whole list are welcome.
- 2
The 30-minute test
Your tester connects a calibrated gauge, isolates the device for a few minutes, and verifies every check valve and relief valve holds the line.
- 3
Pass: report filed
We submit the passing result to your water authority and leave you a copy for your records.
- 4
Fail: fixed and retested
Most failures are rebuildable. We quote the fix before we start, repair or replace, retest, and file the passing result.
The number one killer of backflow preventers here is winter. An above-ground PVB that wasn’t drained in the fall can crack from the inside when trapped water freezes. If your sprinkler system skipped winterization last year, book the test now instead of waiting for the notice. How to winterize it.
Where we go
Backflow testing across Loudoun County
Based in Chantilly, so Loudoun County is home turf. Homes, HOAs, and commercial properties in and around:
Your utility’s rules
Who requires what in Loudoun County
Every program comes from the same Virginia regulation, but each utility runs its own paperwork and deadlines. We work with all of them, and the full Northern Virginia grid is on our main backflow page.
Loudoun Water
Annual test by a certified tester. A failed device has 30 days to be repaired and retested, and irrigation devices pulled for winterization must be retested when they go back in.
Town of Leesburg
Residential irrigation results are due to the Town by June 1 every year. A device that fails needs a passing report within 15 days.
Ashburn
Ashburn homeowners are on Loudoun Water’s program. We’ve served Ashburn backflow work from the start; our Ashburn backflow page has the neighborhood detail.
Questions we hear every week
Loudoun County backflow FAQ
How long do I have to fix a failed backflow test in Loudoun County?
30 days. Loudoun Water requires a failed device to be repaired and retested within 30 days of Loudoun Water’s notice. SwiftPro repairs and retests on the same visit wherever the device is rebuildable.
When are backflow tests due in Leesburg?
Residential irrigation results are due to the Town of Leesburg by June 1 every year. If the device fails, a passing report is due within 15 days.
Do I need to retest my backflow preventer after winterizing in Loudoun?
Only if it was removed. Loudoun Water requires any irrigation backflow device taken off for winterization to be retested when reinstalled. A device drained and covered in place doesn’t trigger that rule.
How long does the test take?
About 30 minutes per device. Your water is off for a few of those minutes while the gauge readings are taken, and that’s the whole disruption.
Who is allowed to do the test?
Virginia is strict about this. Since January 1, 2023, the state only accepts tests performed by a certified Backflow Prevention Device Worker, a DPOR tradesman certification, and some counties add their own registration rules on top. A test that doesn’t meet those rules is void and has to be redone.
What if the device fails?
Most failures are rebuildable: worn check springs, debris in a seat, or a body cracked by a hard freeze. We quote the fix before we start, repair or replace it, retest, and handle the paperwork.
What does it cost?
A flat per-device price we quote when you book, no trip-fee surprise. Testing is the inexpensive end of plumbing work; the expensive path is ignoring the notice until the utility acts.
Two of our techs and the fleet. Loudoun County is a short drive from the Chantilly shop.
Keep reading
More on backflow, in plain English
Loudoun County backflow, before the clock runs.
Book the test before the deadline on your notice and be done with backflow for the year. Ashburn, Sterling, Leesburg, South Riding, HOAs and commercial device lists all welcome.
SwiftPro Heating, Cooling & Plumbing
4230 Lafayette Center Dr N, Chantilly, VA 20151
44679 Endicott Dr, Suite 211, Ashburn, VA 20147
Virginia Class A contractor license #2705192276
Licensed Class A #2705192276 · Based in Chantilly, serving all of Northern Virginia