BAT Cross-Connection Control & Risk Assessment Flashcards

What is a 'direct cross-connection'?

Answer: A physical link that continuously connects the potable system to a contaminant source

A direct cross-connection is a permanent physical link between the potable supply and a non-potable source, posing a continuous backflow risk regardless of operating conditions.

Which condition is most likely to cause backsiphonage in a distribution system?

Answer: A water main break creating negative pressure in the supply line

A water main break can create a sudden vacuum or negative pressure, pulling water backward from connected premises and causing backsiphonage.

Which backflow preventer is typically used for low-hazard (non-health) cross-connections under continuous pressure?

Answer: Double check valve assembly (DCVA)

A DCVA is approved for low-hazard applications such as lawn irrigation without fertilizer injection, providing protection against both backsiphonage and back pressure.

What is 'premise isolation' in a cross-connection control program?

Answer: Installing a backflow preventer at the point of service entry to protect the public main from the entire facility

Premise isolation places a backflow preventer at the meter or service entry to protect the distribution system from any hazards that may exist anywhere within the entire premises.

What is the primary goal of a cross-connection control survey?

Answer: To identify all actual and potential cross-connections and assess the appropriate level of protection needed

A cross-connection control survey systematically identifies every location where contaminants could enter the potable supply and evaluates whether adequate protection exists.

Which federal agency establishes drinking water quality standards that underpin cross-connection control programs in the US?

Answer: Environmental Protection Agency (EPA)

The EPA establishes National Primary Drinking Water Regulations under the Safe Drinking Water Act, which require water suppliers to protect against contamination including cross-connections.