Clemmons water and sewer come from Winston-Salem/Forsyth County Utilities, whose cross-connection program puts backflow assemblies on the owner to install, test and maintain, with WSFC-approved testers filing results through BSI Online. Eligible home irrigation without chemical feed is now on a three-year cycle. Call the number on this page to be connected with a local plumber in Clemmons.

Backflow in Clemmons at a glance
Clemmons grew from about 6,000 people in 1990 to 21,000 in 2020, and most of its homes are 1990s and 2000s subdivisions with a median build year of 1994. A lot of those yards were built with sprinkler systems, which is what usually brings a Clemmons homeowner into WSFC's backflow program.
What to do when a test comes due
- Read the BSI letter. BSI Online mails reminders about 30 days before an assembly is due. Note the date and the device listed.
- Confirm the cycle. Most assemblies test annually. Since September 2024, NC Senate Bill 166 lets eligible residential irrigation without chemical feed test every three years.
- Hire an approved tester. The test must be done by a tester WSFC has approved, and that tester files the report through BSI Online.
- Clear access. Trim plants and open the box lid so the test cocks can be reached.
- If it fails, repair and retest. Worn checks, springs or seals can often be rebuilt; a cracked body means replacement.
- Permit new work. A new or relocated assembly needs a permit from the joint Winston-Salem/Forsyth County Inspections Division, which serves Clemmons, and a properly credentialed plumbing or utility contractor.
Symptoms and what they usually mean
| What you notice | Likely cause |
|---|---|
| Water dumping from an RP assembly's relief port | Fouled first check or a pressure swing on the supply |
| Steady drip from a test cock | Worn cock seal or debris under it |
| Sprinkler zones weak after winter | Freeze damage inside the assembly or a split pipe |
| Water spraying from the valve body | Cracked brass from a hard freeze |
| Test result marked as failed | A check or relief valve no longer holds pressure |
What drives the cost
- Whether the visit is just the test or includes a rebuild and second test
- The device style and pipe size
- Replacement versus repair after freeze damage
- Permit and inspection time for new or moved assemblies
- How many assemblies are on the property
When you call, you'll be connected with an independent plumber who works in Clemmons, from the Lewisville-Clemmons Road corridor to the neighborhoods near Tanglewood Park. Have the BSI letter or your last report nearby, and mention whether the sprinklers run any fertilizer feed so the right test cycle is used.
Backflow Testing questions in Clemmons
Has the testing schedule for home irrigation changed?
How does the utility find out my assembly passed?
What if the assembly doesn't pass?
Do I need a permit to install or move a backflow assembly?
More plumbing services in Clemmons
Backflow Testing nearby
Helpful guides
Sources
Last updated: