Ill. Admin. Code tit. 35, § 302.621 - Determining the Acute Aquatic Toxicity Criterion - Procedure for Combinations of Substances

Current through Vol. 46, No. 16, April 15, 2022

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 sentitive species tested may exhibit mortality or immobility after a 48-hour test for invertebrate or a 96-hour test for fishes.
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.

Notes

Ill. Admin. Code tit. 35, § 302.621

Added at 14 Ill. Reg. 2899, effective February 13, 1990

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