Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 302 - WATER QUALITY STANDARDS
Subpart F - PROCEDURES FOR DETERMINING WATER QUALITY CRITERIA
Section 302.630 - Determining the Chronic Aquatic Toxicity Criterion - Procedure for Combinations of Substances
Universal Citation: 35 IL Admin Code ยง 302.630
Current through Register Vol. 48, No. 38, September 20, 2024
A CATC for any combination of substances (including effluent mixtures) may be determined by toxicity testing procedures pursuant to the following:
a) A combination of substances must not exceed concentrations greater than a NOAEL as determined for the most sensitive of the species tested.
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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