Dumfries homes and businesses get water from Prince William Water, whose cross-connection rules call for testable backflow devices to be tested at installation or repair and every year after. New plumbing and water service work inside town limits is permitted and inspected by the Town of Dumfries, not the County. Call the number on this page to be connected with a local plumber in Dumfries.
What happens when you call
The call reaches an independent plumber who works in Dumfries. Tell them whether the property is inside town limits, what the device protects and whether a notice came from Prince William Water. Ask them to confirm their backflow testing certification. If water is spraying from the device, close the irrigation shutoff or the main valve first.
For a routine test, the plumber checks the assembly with a calibrated gauge and sends the results to Prince William Water's Cross Connection Coordinator. For a repair or new install, they explain the work and the Town permit it needs.
What affects the cost
- The result. A clean pass is short; a failed check adds parts and a retest.
- Type of assembly. A commercial reduced pressure unit on Route 1 is more work than a home vacuum breaker.
- New work. Installing or moving an assembly means parts, labor, a Town permit and an inspection.
- Condition. Corroded valves or a cracked body push the job toward replacement.
Local conditions in Dumfries
Dumfries was chartered in 1749 as a colonial tobacco port on Quantico Creek and is described as the oldest continuously chartered town in Virginia. Today it is a commuter town along U.S. 1, just east of I-95, with neighborhoods such as Williamstown. Prince William Water supplies the town with Occoquan Reservoir water treated at Fairfax Water's Griffith plant, and rates its water as moderately hard. Its backflow program page is aimed mostly at commercial customers, which fits the businesses along Route 1; homeowners with a sprinkler or pool device can ask the Cross Connection Coordinator at (703) 335-8947 whether their device is on file.
The local twist is permitting. The Town of Dumfries Building and Inspection Department handles permit applications and inspections for plumbing, mechanical work and domestic water service inside town limits, and Prince William County's Building Development Division does not issue permits there. The Town offices are at Town Hall, 17739 Main Street, (703) 221-3400.
Before the plumber arrives
- Confirm the address is inside Town of Dumfries limits
- Find the irrigation shutoff and the main valve
- Have any Prince William Water notice on hand
- Clear access to the device
- Turn off the sprinkler controller or any equipment the device serves
Backflow Testing questions in Dumfries
Is a permit needed to install or replace a backflow preventer?
How can I tell which water utility serves my address?
Who pays for the test and any repairs?
Why does a lawn sprinkler system need a backflow preventer?
More plumbing services in Dumfries
Backflow Testing nearby
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