|
Premises Isolation
Premise isolation is preventing backflow into a public water system from a user’s premises by installing a suitable backflow prevention device on the customer’s water service lateral. Premise isolation for a building shall be required even if the water distribution system in the building conforms to current plumbing or building code requirements because backflow into the public water supply can still occur if the individual protection fails.
Two levels of protection shall be recognized for premises isolation as follows:
1. Premises with a moderate hazard classification shall be isolated with a DCVA backflow prevention device. The following are examples of buildings or facilities that shall be isolated from the water supply by a DCVA backflow prevention device:
- High-rise buildings
- Pleasure boat marinas
- Apartment or office buildings
- Multi-service interconnected facilities
- Schools and colleges
- Shopping malls
- Multi-tenant single service facilities
- Premises with sprinkler systems
2. Premises with a severe hazard classification shall be isolated with a RP backflow prevention device. The following are examples of buildings or facilities that shall be isolated from the water supply by a RP backflow prevention device:
- Hospital, operating, laboratory, or mortuary facilities
- Plants using radioactive material
- Petroleum processing and storage facilities
- Chemical or plating plants
- Commercial laundries
- Sewage treatment plants
- Food and beverage processing plants
- Premises where access is restricted
- Dockside facilities for ships
- Premises with sprinkler systems (glycol loop)
|
