(A) Determining the degree of hazard.
(1) No service shall be completed until the Public Works Department has been provided information or has surveyed the private water system to determine the degree of hazard and make a determination of a backflow prevention assembly to be installed to protect the public water supply.
(2) Any customer making any modification to the private system's configuration or use of, which may change the degree of hazard, shall notify the Public Works Department before any modification is made. If the Public Works Department determines that such modification requires a different backflow prevention assembly that assembly must be installed before the modification is made.
(3) The following types of facilities or services have been identified by the City of Oxford Regional Water Resources Department as having a potential for backflow or nonpotable water into the public water supply system. Therefore, an approved backflow prevention assembly will be required on all such services according to the degree of hazard present. Other types of facilities or services not listed below may also be required to install approved backflow prevention assemblies if determined necessary by the Backflow Administrator. As a minimum requirement, all commercial services will be required to install a double check valve assembly unless otherwise listed below:
DCVA | Double check valve assembly |
RP | Reduced pressure principle assembly |
DCDA | Double check detector assembly |
RPDA | Reduced pressure detector assembly |
AG | Air gap |
PVB | Pressure vacuum breaker |
RPZ | Reduced pressure zones |
(a) Aircraft and missile plants: RP.
(b) Automotive service station, dealerships, etc.:
1. No health hazard: DCVA.
2. Health hazard: RP.
(c) Automotive plants: RP.
(d) Auxiliary water systems:
1. Approved public/private water supply: DCVA.
2. Unapproved public/private water supply: AG.
3. Used water and industrial fluids: RP.
(e) Bakeries:
1. No health hazard: DCVA.
2. Health hazard: RPZ.
(f) Beauty shops/barber shops:
1. No health hazard: DCVA.
2. Health hazard: RP.
(g) Beverage bottling plants: RP.
(h) Breweries: RP.
(i) Buildings: Hotels, apartment houses, public and private buildings, or other structures having unprotected cross connections.
1. (Under five stories) No Health hazard: DCVA.
2. (Under five stories) Health hazard: RP.
3. (Over five stories) All: RP.
(j) Canneries, packing houses, and rendering plants: RP.
(k) Chemical plants: Manufacturing, processing, compounding or treatment: RP degree of hazard, due to confidential activities, a reduced pressure zone assembly will be required.
(B) Low hazard.
(1) All single-family residential homes will be considered a low hazard and shall have a minimum of a dual check valve device installed at the meter service.
(2) If no other backflow prevention assembly is specified a double check valve assembly must be installed on all private property.
(C) Imminent.
(1) If it has been determined a customer's private water system has an imminent hazard; such customer must install a backflow prevention assembly specified by the Public Works Department and this article. This assembly must be installed within 24 hours of notification from the Administrator. If the customer fails to install the specified assembly within the allowed time limit, water service to the customer's private water system will be terminated and may be subject to specified civil penalties. In the event the Public Works Departments unable to notify the customer in 24 hours of determining an imminent hazard exists, the Administrator may terminate water service until the specified assembly is installed. These actions may be carried out under the Safe Drinking Water Act (Title XIV Section 1431) and the N.C. State Plumbing Code (Appendix D104.2.6).
(2) Only a backflow prevention assembly offering a greater degree of protection may be installed in place of a specified assembly required by this article.
(Ord. 18-08-16, passed 8-14-18)