Figure: 30 TAC §290.47(f)

Appendix F: Assessment of Hazards and Selection of Assemblies
The following table lists many common hazards. It is not an all-inclusive list of the hazards which may be found connected to public water systems.

Premises Isolation: Description of Premises Assessment of Hazard Required Assembly

Aircraft and missile plants Health RPBA or AG
Animal feedlots Health RPBA or AG
Automotive plants Health RPBA or AG
Breweries Health RPBA or AG
Canneries, packing houses and rendering
plants
Health RPBA or AG
Commercial car wash facilities Health RPBA or AG
Commercial laundries Health RPBA or AG
Cold storage facilities Health RPBA or AG
Connection to sewer pipe Health RPBA or AG
Dairies Health RPBA or AG
Docks and dockside facilities Health RPBA or AG
Dye works Health RPBA or AG
Food and beverage processing plants Health RPBA or AG
Hospitals, morgues, mortuaries, medical
clinics, dental clinics, veterinary clinics,
autopsy facilities, sanitariums, and medical
labs
Health RPBA or AG
Metal manufacturing, cleaning, processing,
and fabrication plants
Health RPBA or AG
Microchip fabrication facilities Health RPBA or AG
Paper and paper products plants Health RPBA or AG
Petroleum processing or storage facilities Health RPBA or AG
Photo and film processing labs Health RPBA or AG
Plants using radioactive material Health RPBA or AG
Plating or chemical plants Health RPBA or AG
Pleasure-boat marinas Health RPBA or AG
Private/Individual/Unmonitored wells Health RPBA or AG
Rainwater harvesting system Health RPBA or AG
Reclaimed water systems Health RPBA or AG
Restricted, classified or other closed facilities Health RPBA or AG
Rubber plants Health RPBA or AG
Sewage lift stations Health RPBA or AG
Sewage treatment plants Health RPBA or AG
Slaughter houses Health RPBA or AG
Steam plants Health RPBA or AG
Tall buildings or elevation differences where
the highest outlet is 80 feet or more above the
meter
Nonhealth DCVA

Internal Protection - Description of Cross-
Connection
Assessment of Hazard Required Assembly

Aspirators Nonhealth† AVB
Aspirator (medical) Health AVB or PVB
Autoclaves Health RPBA
Autopsy and mortuary equipment Health AVB or PVB
Bedpan washers Health AVB or PVB
Connection to industrial fluid systems Health RPBA
Connection to plating tanks Health RPBA
Connection to salt-water cooling systems Health RPBA
Connection to sewer pipe Health AG
Cooling towers with chemical additives Health AG
Cuspidors Health AVB or PVB
Degreasing equipment Nonhealth† DCVA
Domestic space-heating boiler Nonhealth† RPBA
Dye vats or machines Health RPBA
Fire-fighting system (toxic liquid foam
concentrates)
Health RPBA
Flexible shower heads Nonhealth† AVB or PVB
Heating equipment
   Commercial
   Domestic

Nonhealth†
Nonhealth†

RPBA
DCVA
Hose bibs Nonhealth† AVB
Irrigation systems
with chemical additives
without chemical additives

Health
Nonhealth†

RPBA
DCVA, AVB, or PVB
Kitchen equipment - Commercial Nonhealth† AVB
Lab bench equipment Health or Nonhealth† AVB or PVB
Ornamental fountains Health AVB or PVB
Swimming pools
   Private
   Public

Nonhealth†
Nonhealth†

PVB or AG
RPBA or AG
Sewage pump Health AG
Sewage ejectors Health AG
Shampoo basins Nonhealth† AVB
Specimen tanks Health AVB or PVB
Steam generators Nonhealth† RPBA
Steam tables Nonhealth† AVB
Sterilizers Health RPBA
Tank vats or other vessels containing toxic
substances
Health RPBA
Trap primers Health AG
Vending machines Nonhealth† RPBA or PVB
Watering troughs Health AG or PVB

NOTE: AG = air gap; AVB = atmospheric vacuum breaker; DCVA = double check valve backflow prevention assembly; PVB = pressure vacuum breaker; RPBA = reduced-pressure principle backflow prevention assembly.

*AVBs and PVBs may be used to isolate health hazards under certain conditions, that is, back siphonage situations. Additional area of premises isolation may be required.

†Where a greater hazard exists (due to toxicity or other potential health impact) additional area protection with RPBAs is required.