The 3Rs in whole-effluent toxicity testing, a Canadian perspective

Area of Science:

• Environmental Toxicology
• Regulatory Science
• In vitro toxicology

Background:

• Growing demand for New Approach Methods (NAMs) to replace animal testing (3Rs: refine, reduce, replace).
• NAMs are primarily used for chemical assessments, with limited application in whole-effluent toxicity (WET) testing.
• WET testing is a high-volume, repetitive regulatory tool ideal for NAM implementation.

Purpose of the Study:

• Investigate NAM applicability to Canadian whole-effluent toxicity (WET) regulation.
• Address the need for NAMs in light of evolving policies on vertebrate use in toxicity testing.
• Identify potential NAMs for WET testing and assess their regulatory fit.

Main Methods:

• Literature review of current Canadian effluent toxicity regulations.
• Analysis of three emerging NAMs for their potential in WET testing.
• Evaluation of NAMs' suitability for meeting environmental regulatory requirements.

Main Results:

• Current Canadian WET regulations are discussed.
• Three NAMs show potential for WET testing but face challenges in meeting regulatory needs.
• Research gaps and areas for further investigation are identified.

Conclusions:

• NAMs offer a promising avenue to modernize WET testing and reduce animal use in Canada.
• Integration of NAMs requires addressing specific regulatory hurdles and further research.
• Proposed strategies for integrating NAMs into environmental regulations for robust effluent evaluation.