Premises Isolation for Severe and High Health Hazard Facilities

“The purveyor shall ensure that an approved air gap, RPBA, or RPDA is installed for premises isolation for service connections to premises posing a high health cross-connection hazard including, but not limited to, those premises listed in Table 13 of this section, except those premises identified as severe in (b)(ii) of this subsection.
- For service connections to premises posing a severe health cross-connection hazard including wastewater treatment plants, radioactive material processing plants, and nuclear reactors, the purveyor shall ensure that either an:
  - Approved air gap is installed for premises isolation; or
  - Approved RPBA or RPDA is installed for premises isolation in combination with an in-plant approved air gap.
- If the purveyor's CCS determines that no hazard exists for a connection serving premises of the type listed in Table 13 of this section, the purveyor may grant an exception to the premises isolation requirements of (b)(i) of this subsection.”

Hospitals (including psychiatric hospitals and alcohol and drug treatment centers)
Same Day Surgery Centers
Outpatient Clinics and Offices
Alternative health Outpatient Clinics and Offices
Psychiatric Outpatient Offices and Clinics
Chiropractors
Hospice Care Centers
Childbirth Centers
Kidney Dialysis Centers
Blood Centers
Dental Clinics and Offices
Nursing Homes
Boarding Homes
Residential Treatment Centers
Mortuaries
Morgues and Autopsy Facilities (not in hospitals)
Veterinarian Offices, Clinics, and Hospitals

Agricultural (Farms & Dairies)
Beverage Bottling Plants (including Breweries)
Car Washes
Chemical Plants
Commercial Laundries and Dry Cleaners
Both Reclaimed and Potable Water Available
Film Processing Facilities
Dedicated Fire Protection Systems with Chemical Addition or Using Unapproved Auxiliary Supplies
Food Processing Plants (including canneries, slaughterhouses, rendering plants)
Dedicated Irrigation Systems Using Purveyor’s Water Supply and Chemical Addition
Laboratories
Metal Plating Facilities
Petroleum Processing and Storage Plants
Piers and Docks
Survey Access Denied or restricted
Wastewater Lift/Pump Stations (non-residential only)
Unapproved Auxiliary Water Supply Interconnected with Potable Water Supply

PREMISES ISOLATION BY WATER SERVICE TYPE:

Domestic Water Services
- Severe & High Health Hazard Facilities
  - RPBA installed above ground and just inside property line
    - Enclosure must be able to drain a fully open RPBA and be freeze protected
- Tall Buildings (>30’ or 3 Stories)
  - DCVA installed before water piping is routed to upper floors
Dedicated Fire Services
- No Chemical Addition
  - DCVA in a vault and just inside property line
- With Chemical Addition
  - RPBA installed above ground and just inside property line
    - Enclosure must be able to drain a fully open RPBA and be freeze protected
Combo (Domestic & Fire) Water Services
- Severe & High Health Hazard Facilities
  - RPBA installed above ground and just inside property line
    - Enclosure must be able to drain a fully open RPBA and be freeze protected
- Tall Buildings
  - (Domestic) Required backflow assembly type installed before water piping is routed to upper floors
- (Fire) Required backflow assembly type installed immediately after the Fire protection system tees off from the Domestic
Alternate Location Requests
- SPU will consider approving alternate locations where customers demonstrate that the above are not possible (Ex. Zero lot line)
  - Submit alternate location requests to SPU_CCCBackflowProtection@seattle.gov for review and pre-approval

Downtown Customer Service Center temporary closure on July 30