Specifications and Guidelines
The device(s) shall be installed according to the following guidelines:
Pit installations will not be allowed. The device should be equipped with a relief valve assembly, which under certain conditions may dump large volumes of water. Consequently, adequate drainage should be provided. The installation of a strainer is strongly recommended to protect the disks from unnecessary fouling. A bypass around this device will not be allowed (unless protected by a second device). This device should be installed on the downstream (outlet) side of the meter. This device should be installed according to manufacturer specifications.
Commercial customers are required to have backflow prevention devices inspected annually by a person certified by the New England Water Works Association, American Backflow Prevention Association, or the American Society of Safety Engineers.
- The Portland Water District sends a letter prior to the inspection due date.
- Customers have 60 days to complete an inspection with a certified inspector and make repairs if necessary.
- A Backflow Device Test Results Form must be completed within 10 business days of the inspection. A customer may also contact our customer service center and request a form be sent to them if they do not have access to the internet. Failure to provide this information may result in disconnection of the water service to your premises.
As a quality assurance measure, the Portland Water District will randomly inspect devices. If your device is chosen for additional testing, there will be no charge for this service.