On July 28, 2008, amendments to the federal Pulp and Paper Effluent Regulations came into force. Among other things, the amendments exempt mills that have ceased production of pulp or paper products for at least eight consecutive months from the regulatory requirement to complete environmental-effects monitoring. The amendments also require mills and off-site treatment facilities to conduct sub-lethal toxicity tests twice a year using an invertebrate species and an algal species (rather than six times a year using a fish species, as was previously required). In addition, the amendments establish the frequency for conducting each component of a biological monitoring study (the components being a fish survey, benthic survey and fish tissue survey) rather than setting the frequency for the study as a whole, as was previously required. 

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