Backflow Testing & Certification in Shreveport, LA

State-Certified Backflow Testers Protecting Shreveport’s Water Supply

Backflow prevention keeps contaminated water from reversing direction into Shreveport’s clean drinking supply. Mark Johnson & Sons Plumbing provides comprehensive backflow testing, device installation, and annual certification services that satisfy Louisiana Department of Health requirements and keep your property compliant. As part of our comprehensive plumbing services in Shreveport, we deliver professional results backed by decades of experience.

Why Backflow Testing Matters

Every plumbing system connects to the municipal water supply through a series of pressurized lines. Under normal conditions, water flows in one direction — from the city main into your home. But pressure drops from water main breaks, fire hydrant use, or heavy demand on Shreveport’s infrastructure can create a vacuum effect that pulls contaminated water backward into the public supply.

This cross-connection risk is not theoretical. Irrigation systems pull fertilizers and pesticides, commercial properties handle chemicals, and even residential pools introduce chlorinated or stagnant water. Without a functioning backflow preventer, a single pressure drop can introduce hazardous substances into the water your neighbors drink.

Louisiana state law and Shreveport’s water utility require backflow prevention devices on properties with identified cross-connections. Annual testing confirms these devices operate within specification, and only certified testers can perform and document the inspection.

Our Backflow Testing Services

Annual Backflow Testing

We test all types of backflow prevention assemblies — reduced pressure zone (RPZ), double check valve (DCV), pressure vacuum breakers (PVB), and spill-resistant vacuum breakers. Each test follows the procedures mandated by the Louisiana State Plumbing Board and produces documentation accepted by Shreveport water authorities.

Backflow Device Installation

When your property requires a new backflow preventer — whether for a new irrigation system, pool connection, or fire suppression line — we size, select, and install the appropriate assembly. Our installations meet both Louisiana plumbing code and manufacturer specifications.

Repair & Rebuilds

Failed backflow tests do not always require full replacement. We carry rebuild kits for all major manufacturers and can often restore a device to passing condition the same day. If a device is beyond repair, we provide replacement options and pricing before proceeding.

Compliance Documentation

We file completed test reports with the appropriate water utility and provide you with copies for your records. If your property management company, HOA, or commercial insurer requires documentation, we supply it in the format they need.

Cross-Connection Surveys

Not sure whether your Shreveport property requires a backflow device? We conduct surveys that identify every cross-connection point and recommend the appropriate level of protection for each.

Call us at 318-319-0220 today or click below to schedule service.

When to Call for Backflow Service

• You received a compliance notice from the City of Shreveport or your water provider
• Your annual certification is due or overdue
• A new irrigation system, pool, or fire sprinkler system has been installed
• Your backflow device is leaking, dripping continuously, or making unusual noises
• You are purchasing a commercial or multi-family property and need inspection documentation
• Water from your property has an unusual taste, color, or odor
• Your landscaper or pool contractor flagged a potential cross-connection

Why Choose Mark Johnson & Sons in Shreveport

• Certified backflow testers — trained, licensed, and equipped to test every device type in residential and light commercial applications
• Same-day filing — we submit test reports to Shreveport utilities promptly so your property stays in good standing
• Veteran-owned integrity — founded in 1997, Mark Johnson & Sons has built its reputation on honest assessments and fair pricing
• Flat-rate pricing — you know the cost of testing before we begin, with no hidden fees for filing or documentation
• Fully stocked for repairs — if your device fails testing, we carry common rebuild kits and replacement parts on every truck
• Scheduling that respects your time — we provide arrival windows and notify you when our technician is en route

Frequently Asked Questions

What is backflow and why is it dangerous?

Backflow occurs when water reverses direction in your plumbing, potentially pulling contaminants like chemicals, bacteria, or waste into the clean water supply. It poses a serious public health risk that backflow prevention devices are designed to eliminate.

Does Louisiana require backflow testing?

Yes. Louisiana’s State Health Officer mandates backflow prevention on all identified cross-connections. The City of Shreveport enforces annual testing for properties with irrigation systems, fire suppression, boiler feeds, and other high-risk connections.

How often does my backflow device need testing?

Most backflow prevention assemblies require annual testing. Some commercial applications or high-hazard connections may require more frequent inspections depending on local ordinance.

How long does a backflow test take?

A standard residential backflow test typically takes 20 to 30 minutes, including documentation. If the device requires repair, additional time may be needed.

What happens if my backflow device fails the test?

We diagnose the failure point and provide repair options on the spot. Many devices can be rebuilt and retested the same day. If replacement is necessary, we provide a quote and can usually complete the work within 48 hours.

Will I lose water during the test?

There is a brief interruption to the water supply served by the backflow device during testing, typically lasting only a few minutes. Your main household water supply is not affected.

How much does backflow testing cost in Shreveport?

Our flat-rate pricing covers the test, documentation, and filing with the utility. Contact us at 318-319-0220 for current rates, as costs vary by device type and location.

Can I test my own backflow device?

No. Louisiana requires that backflow tests be performed by a certified tester using calibrated testing equipment. Self-testing is not accepted by any water utility in the state.

What types of properties need backflow preventers in Shreveport?

Any property with an irrigation system, swimming pool, fire suppression system, boiler, or any connection where non-potable water could contact the supply line. This includes many single-family homes with in-ground sprinkler systems.

Do you handle commercial backflow testing as well?

We serve residential and light commercial properties throughout Shreveport and Caddo Parish. For large commercial or industrial facilities, contact us to discuss scope and scheduling.

Related Shreveport Services

• Bathroom Plumbing in Shreveport
• Bathroom Remodeling in Shreveport
• Toilet Repair in Shreveport
• Septic Tank Treatment in Shreveport
• Pool Plumbing in Shreveport

View all plumbing services in Shreveport or explore our full Shreveport service area.

Contact Us Today

Staying compliant with Shreveport’s backflow requirements protects your property, your neighbors, and your standing with the water utility. Mark Johnson & Sons Plumbing makes the process straightforward — one call, one visit, and your documentation is filed. Call 318-319-0220 to schedule your backflow test today.