Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 302 - WATER QUALITY STANDARDS
Subpart F - PROCEDURES FOR DETERMINING WATER QUALITY CRITERIA
Section 302.621 - Determining the Acute Aquatic Toxicity Criterion - Procedure for Combinations of Substances
Universal Citation: 35 IL Admin Code ยง 302.621
Current through Register Vol. 48, No. 38, September 20, 2024
An AATC for any combination of substances (including effluent mixtures) must be determined by the following toxicity testing procedures:
a) Not more than 50% of test organisms from the most sensitive species tested may exhibit mortality or immobility after a 48-hour test for invertebrates or a 96-hour test for fish.
b) Three resident or indigenous species of ecologically diverse taxa must be tested initially. If resident or indigenous species are not available for testing, non-resident species may be used if the non-resident species is of the same family or genus and has a similar habitat and environmental tolerance.
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