How to Become a Backflow Tester in California

Backflow testing is a specialized skill that plays a critical role in protecting public drinking water. In California, certified backflow testers are in high demand by cities, water districts, and property managers to ensure backflow prevention assemblies are working properly.

If you’re looking to start a career as a backflow tester, here’s a step-by-step guide to getting certified in California.

What Does a Backflow Tester Do?

A backflow tester inspects and tests backflow prevention assemblies to ensure contaminated water cannot flow back into the clean water supply. These devices are required in commercial buildings, irrigation systems, fire systems, and many residential applications.

Testers perform:

Annual required testing
Troubleshooting of failed assemblies
Repairs and maintenance
Documentation and submission of test reports to local agencies

Step 1: Take a Backflow Tester Training Course

The first step is to complete a state-recognized backflow training course. Most certification programs require either:

A 36–40 hour approved training course, or
Two years of field experience in backflow testing

A training course teaches:

Backflow principles and hydraulics
Types of assemblies (RP, DC, PVB, SVB)
Proper testing procedures
Troubleshooting techniques
Hands-on use of testing equipment

Important: A training course is not the certification — it prepares you to pass the certification exam.

Step 2: Apply for Certification

In California, the most widely accepted certification is through the
California-Nevada Section of the American Water Works Association

You’ll need to:

Submit an application
Provide proof of training or experience
Pay the exam fee
Schedule your exam

Applications typically must be submitted at least 20 days before your exam date.

Step 3: Pass the Written Exam (Part A & Part B)

The written exam is computer-based and divided into two parts:

Part A — Theory

Covers:

Backflow principles
Hydraulics
Cross-connection control
Codes and regulations

Part B — Troubleshooting

Covers:

Diagnosing failed tests
Understanding test results
Identifying assembly issues
Applying real-world scenarios

You must pass both parts of the written exam to move forward.

Step 4: Pass the Hands-On Performance Exam

After (or alongside) the written exam, you must pass a practical exam where you:

Perform actual backflow tests on assemblies
Demonstrate proper procedures
Show accuracy using test gauges
Identify failures and issues

This is where many people struggle — hands-on training is critical.

Step 5: Get Certified

Once you pass:

Written Exam (Part A & B)
Hands-On Performance Exam

You’ll receive your certification as a Backflow Prevention Assembly Tester (BPAT).

This certification is accepted by most water agencies throughout California.

Step 6: Start Working as a Certified Tester

After certification, you can:

Work for a plumbing company
Start your own backflow testing business
Contract with property managers
Provide services to HOAs, cities, and commercial facilities

Many testers build recurring income through annual testing contracts.

How Long Does It Take?

Most people can become certified in:

1–2 weeks (training course)
2–6 weeks total (including exam scheduling and results)

How Much Does It Cost?

Typical costs include:

Training course: $800 – $2,000
Exam fees: ~$350–$400
Test kit (optional to start): $1,500 – $3,000

Is Backflow Testing a Good Career?

Yes — especially in California.

Required by law in most jurisdictions
Recurring annual work
Low overhead compared to full plumbing
High demand from property managers and municipalities

Final Thoughts

Becoming a backflow tester in California is one of the fastest ways to enter a specialized, in-demand trade. With the right training and certification, you can start generating income quickly and even build your own business.

Ready to Get Started?

If you’re looking for a training program that prepares you for both the written and hands-on exams, check out our Backflow Tester Certification Course.