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Backflow Prevention provides protection of the drinking water system from contaminates and pollutants that can come from cross connections and changes in the hydraulic conditions within the system.

The Backflow Prevention section oversees the specifications for vault (meter pits) and backflow installation in Gwinnett County. Additionally, Backflow Prevention coordinates activities with Water & Sewer Review and the Department of Planning & Development to make sure contractors are following correct installation procedures and development requirements. For more information on backflow prevention, please call 678.376.4213 or email dwrbackflow@gwinnettcounty.com.

Gwinnett County Department of Water Resources is a proud member of the American Backflow Prevention Association since 1990.
Approved Contractors and Testers

Click Here for a list of approved backflow installation contractors (PDF).

Click Here for a list of approved backflow device testers (PDF).


Approved Tester Links

Click Here to download the Device Test Data and Maintenance Form (PDF).

Click Here to download the Application for Gwinnett County Approved Testers List (PDF).

Click Here to enter backflow test reports online.


Backflow Prevention FAQs
Questions Commonly Asked About Backflow Prevention

Requirements For Vault and Backflow Installation in Gwinnett County
  1. No work to begin without obtaining a Utility Construction permit from the Department of Planning and Development, Water and Sewer Plan Review Section. Please call 678.518.6000 for Water and Sewer Plan Review.
  2. The inspector Must be given 48 hour notice prior to starting Any installation.
  3. When constructing a vault, refer to the following schematics.

6 - Double Detector Check Valve
8 - Double Detector Check Valve
10 - Double Detector Check Valve
6 - Double Detector Check Valve with 3 - Compound Meter
6 - Double Detector Check Valve with 4 - Compound Meter
8 - Double Detector Check Valve with 3 - Compound Meter
8 - Double Detector Check Valve with 4 - Compound Meter
8 - Double Detector Check Valve with 6 - Compound Meter
10 - Double Detector Check Valve with 8 - Fire Service Meter
6 -Fire Service Meter with 4 - By-Pass Non-Traffic Bearing Vault
8 - Fire Service Meter with 6 - By-Pass Non-Traffic Bearing Vault
6 - Fire Service Meter Non-Traffic Bearing Vault
8 - Fire Service Meter Non-Traffic Bearing Vault
3 - Compound Meter Non-Traffic Bearing Vault
4 - Compound Meter Non-Traffic Bearing Vault
2 - 8 - Double Detector Check Valve 14' - 10' Vault
Retrofit guidelines
Backflow Prevention manual of practice


Additional Links