Backflow Testing in Waldorf, MD

Why can't I keep the vacuum breaker on my sprinkler line?

Charles County no longer permits pressure vacuum breakers on lawn irrigation. A sprinkler system connected to county water in Waldorf has to be protected by a reduced pressure zone assembly that meets ASSE 1013. An RPZ has two independent check valves with a relief valve between them, so if pressure on the street side drops, the relief opens and dumps water rather than letting lawn water, fertilizer or anything sitting in the heads drift back toward the main. Plenty of systems in St. Charles and Smallwood Village were set up years ago with the older style of device, so a conversion is a common job. Installing irrigation, or swapping the device, also needs a Charles County backflow permit.

Can I run the sprinklers while I wait for the test?

Not under the county's rules. An irrigation system cannot be used until its assembly passes the annual test. Because most homes in the 20603 ZIP code went up after 1980, a lot of Waldorf yards have in-ground systems installed by the builder, and those assemblies come due every spring. Booking the test before the first hot week saves a brown lawn. If the device fails, the plumber can usually rebuild the checks or relief valve on the spot and retest, or quote a replacement if the body is damaged.

Who do I call with questions about my account?

Water and sewer in Waldorf come from the county Department of Public Works, which runs the Waldorf community system on deep wells in the Patapsco and Magothy aquifers blended with water purchased from WSSC. Questions about a specific assembly or a compliance letter go to the county's Cross Connection Control Specialist at 301-609-5606. General utility questions go to the Utilities Division at 301-609-7400. Building and plumbing permit questions belong to Codes, Permits and Inspection Services in La Plata, at 301-645-0692.

A note for Waldorf owners

When you call, mention whether the device protects irrigation, a fire sprinkler line or a business, and whether it is an RPZ or an older vacuum breaker. Ask the plumber to confirm they hold the master or journey certification the county requires for testing. Outdoor RPZ assemblies sit above ground, so an insulated cover or draining the line before the first hard freeze keeps the brass body from splitting over a Southern Maryland winter.