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Alternative Concentration Limit (ACL)

Definition - What does Alternative Concentration Limit (ACL) mean?

Alternative Concentration Limits (ACL) are risk based concentration limits used to determine ground water protection standards. EPA or other federal agencies determine that these limits of contaminant concentrations will not pose a threat to human or environmental health through scientific research, experimentation and environmental assessment. These are established under the authority of RCRA or CERCLA based on the assessments of EPA or other federal agencies.

Safeopedia explains Alternative Concentration Limit (ACL)

ACLs are one of three types of standards used to determine ground water protection. The two others are:

  1. Background concentrations: The levels of contaminants found in the area naturally.
  2. Specific values set by federal regulations in Title 40, Part 264.94, of the Code of Federal Regulations for eight metals and six pesticides and herbicides. These may be applied when a leak is detected at a treatment, storage, or disposal facility and groundwater compliance monitoring is required.

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