Backflow Preventer Plan Check
As one of the requirements prior to the issuance of a Plumbing Permit by Long Beach Development Services, a plumbing applicant must go through plan review with the Long Beach Water Department (LBWD) for backflow prevention requirement(s).
Projects that shall require backflow include but not limited to the following:
- Building with three stories or more
- Facilities with below-ground grease interceptor on-site
- Facilities generating hazardous chemicals on-site
- Facilities with pump tied into waterline
- Facilities generating any additional on-site hazards
- Buildings or sites with dedicated irrigation system
- Sites with recycled water use on-site
Additional Information
Water services 2” and smaller shall be sized per the CPC, latest edition.
- In cases where sizing per CPC is not applicable, it is advised that demand (in gallons per minute / gpm) at the water meter should not exceed the following Meter Size and Lateral Size Criteria:
- Safe Maximum Operating Capacity, (defined as 10 percent of usage, or 2 hours per day), and the Recommended Maximum Rate for Continuous Operation (per AWWA C700-15, Table 1):
Meter Size: |
3/4″ |
1” |
1 ½” |
2” |
Safe Max (GPM):. |
30 |
50 |
100 |
160 |
Continuous (GPM): |
15 |
25 |
50 |
80 |
Lateral size |
3/4” |
1” |
1 ½” |
2” |
3” |
4” |
6” |
8” |
10” |
12” |
Demand (gpm) |
11 |
19 |
44 |
78 |
156 |
310 |
700 |
1250 |
1950 |
2800 |
Based on maximum velocity of 8 feet per second.
Lead Time
The typical processing time for your Backflow plan check request is approximately 7-10 business days.