Certified Backflow Prevention Specialists - Testing, Repairs & Installation
Licensed backflow prevention specialistsÂ
Same-day testing & compliance reports
Certified for residential, commercial & municipal systems
Serving the DC metro area for more than 15 years!
Your Trusted WSSC Plumber
 Durance Plumbing is a WSSC licensed, full-service plumbing company providing residential and light commercial plumbing services with a strong focus on water heaters, backflow testing,
and regulated plumbing work.
We regularly perform permitted plumbing projects and work within WSSC requirements where applicable, ensuring work is completed correctly and inspected properly.
Our experience includes water heater installation and replacement, backflow testing and compliance, plumbing repairs, and system upgrades.
We understand how permitting and inspections affect plumbing projects and plan work accordingly.
Property owners and managers rely on us for clear communication, proper documentation, and code-compliant results.
We focus on long-term reliability rather than quick fixes. When plumbing work involves permits, inspections, or regulated systems, Durance Plumbing provides professional service you can trust.
Durance Means Durability
Your Satisfaction is our #1 Job!
Durance Plumbing serves homeowners and business owners with integrity and a commitment to excellence for all plumbing services we provide. We’re committed to quality work at affordable prices, and back up all work we do with a 100% Workmanship Guarantee.
Backflow Preventer Services
Durance Plumbing is certified and licensed to perform backflow preventer testing, replacing and repairs in Maryland DC and Virginia.
For questions regarding backflow inspection costs or to schedule an appointment to have your backflow assembly tested and/or maintained click the corresponding link below
Anne Arundel County Backflow Testing
Water Heater Services
More Info
Durance Plumbing is a full service water heater sales, installation and repair company . We serve the counties of Montgomery, Anne Arundel and Prince George’s in Maryland. We will give you an estimate before we begin any project and all work is guaranteed.
Sewer and Drain Services
We provide professional drain and sewer services.
- What types of plumbing services do you provide?
- What is backflow testing, and why is it important?
- Do you offer plumbing services outside of business hours?
- What areas do you service?
- How much do plumbing services cost?
- What kind of warranties do you offer?
- General plumbing repairs (leaks, clogs, fixture replacements)
- Water heater installation and repair (tank and tankless systems)
- Sump pump installation and maintenance
- Drain cleaning and hydro-jetting
- Sewer line repair and replacement
- Backflow prevention testing and installation
- Pipe installation and repair (copper, PEX, etc.)
- Bathroom and kitchen remodels
- If a specific service you need isn’t listed, feel free to contact us—we’re likely able to help with any plumbing project.
Backflow testing ensures that your potable (drinkable) water remains uncontaminated by non-potable water due to pressure changes. Backflow can bring chemicals, waste, or bacteria into your clean water supply, which is why local regulations often require testing.
In St. Mary’s County, backflow devices only need to be tagged, but other counties may have stricter rules. We are licensed to perform backflow testing to keep your water safe and in compliance with local codes.
Our business hours are 8:00 AM to 5:00 PM, Monday through Friday. We do not offer services outside of these hours. Please contact us during business hours to schedule an appointment.
We proudly serve the Washington, DC metropolitan area, including:
Montgomery County: Rockville, Gaithersburg, Takoma Park
Prince George’s County: Bowie, Laurel, College Park
We do backflow testing in the DC metro area including Fairfax, Arlington, Alexandria. If you’re unsure whether we cover your area, feel free to call us, and we’ll be happy to confirm.
The cost of plumbing services varies depending on the type and complexity of the job. Whether it’s a simple repair or a larger project like a water heater installation, we provide transparent pricing so you know the cost before we begin the work.
We offer warranties based on the service:
Repairs come with a one-year warranty on parts and labor.
Water heater installations include manufacturer warranties, which typically range from 5 to 12 years, and we offer a one-year labor warranty.
Pipe repairs and replacements come with warranties up to 10 years, depending on the materials used.
We’ll provide specific warranty details for your service when you schedule your appointment.