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Short-Term Methods For Estimating the Chronic Toxicity of Effluents and Receiving Water to Marine and Estuarine Organisms

This manual describes six short-term (one-hour to nine-day) methods for estimating the chronic toxicity of effluents and receiving waters to five species:

  1. the sheepshead minnow, Cyprinodon variegatus
  2. the inland silverside, Menidia beryllina
  3. the mysid shrimp, Mysidopsis bahia
  4. the sea urchin, Arbacia punctulata
  5. and the red macroalga, Champia parvula

These rules do not apply to discharges into marine waters of the Pacific Ocean. Guidelines are included on laboratory safety, quality assurance, facilities and equipment, dilution water, effluent sampling methods and holding times and temperatures, data analysis, report preparation, and organism culturing and handling.

Browse Introduction

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Supporting Rule

Guidelines Establishing Test Procedures for the Analysis of Pollutants; Whole Effluent Toxicity Test Methods; Final Rule (November 19, 2002) In this final regulation, we ratified approval of several test procedures for measuring the toxicity of effluents and receiving waters. The test procedures are commonly referred to as whole effluent toxicity or WET test methods. We also withdrew two WET test methods from the list of nationally-approved biological test procedures for the analysis of pollutants. This action also revises some of the WET test methods to improve performance and increase confidence in the reliability of the results. This action satisfies settlement agreement obligations designed to resolve litigation over an earlier rulemaking that originally approved WET test methods.


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