Backflow Testing & Prevention

Backflow Testing & Certification

Keeping San Antonio's Water Safe & Your Business Compliant

Backflow prevention assemblies are the unsung guardians of our public water supply. Required by SAWS, TCEQ, and local codes, these devices prevent contaminated water from your irrigation or commercial system from flowing back into the clean city water supply.

Merritt Plumbing is certified to test, repair, and install all types of backflow preventers (RPZ, DCVA, PVB) for commercial, industrial, and irrigation systems.

Call (830) 251-5391 to speak with our team today, or contact us online to schedule a free estimate.

Trust the Local Team

  • Licensed Professionals
    Licensed by the Texas State Board of Plumbing Examiners, we maintain high standards on every job.
  • 24/7 Plumbing Service
    Day or night, our team is available to handle residential and commercial plumbing emergencies.
  • No Guesswork Repairs
    Our background in new construction helps us accurately identify plumbing issues and provide the right solution.
  • Family-Owned Since 1984
    With decades of experience, Merritt Plumbing brings trusted, local service backed by a long-standing commitment to quality.

Hear From Our Happy Customers

At Merritt Plumbing, your satisfaction is our priority! See for yourself what our customers have to say about working with us.

    "They also do a great job and are always friendly."

    I never have a problem scheduling service and they come out quickly.

    - James B.
    "Can't say enough good about this company."

    Merritt Plumbing always comes out very quickly and does great work.

    - Robert A.
    "Would highly recommend to anyone with plumbing needs."

    Very knowledgeable and willing to answer all of my questions.

    - Graham N.
    "Paul at Merritt Plumbing was great."

    He was on time and assessed/performed the work in a professional manner.

    - Parker L.
    "I HIGHLY recommend Merritt Plumbing!"

    What a blessing to listen to their happy chatter - they loved their job and did it proudly!

    - Cindi R.
    "George and his partner were very polite and helpful."

    Total time about two hours.

    - Debra C.
    "Thanks for taking care of business!"

    Bill is professional, knowledgeable, and responded immediately to requests while navigating a very crowded event

    - Tracie A.
    "Super knowledgeable and honest!"

    I called Merritt Plumbing, and they came out the same day to take care of my issue.

    - Madeline T.

We Handle the Paperwork

  • Annual Testing: We perform the required gauge test to ensure the assembly is functioning correctly.
  • Reporting: We submit the official test report directly to SAWS (or your local water purveyor) on your behalf, so you stay compliant and avoid fines.
  • Tagging: We tag the device with the current certification date.

Repair & Installation:

  • Diagnostics: If a device fails, we diagnose the cause (fouled checks, relief valve failure).
  • Rebuilds: We stock repair kits to fix many assemblies on the spot.
  • Replacement: If a unit is beyond repair or stolen (a common issue), we install a new, code-compliant assembly with theft-deterrent cages if needed.

Who Needs This?

  • Restaurants (Soda machines, boilers)
  • Medical Offices & Dentists
  • Properties with Irrigation Systems
  • Car Washes & Dry Cleaners

Stay Compliant. Don’t risk water shutoffs or fines. Schedule your annual Backflow Test with Merritt today.

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Areas We Service
  • Boerne
  • Bulverde
  • Center Point
  • Comfort
  • Cross Mountain
  • Fair Oaks Ranch
  • Helotes
  • Lakehills
  • Pipe Creek
  • San Antonio
  • Scenic Oaks
  • Shavano Park
  • Spring Branch
  • Timberwood Park