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<title>My Water Quality: Aquatic Ecosystem Health - Streams, Rivers &amp; Lakes</title>
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<h1 style="margin-top:32px; width:60%;">California Streams, Rivers and Lakes</h1>




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    <td valign="top"><p><img src="../images/tox_categories396x315.gif" alt="Toxicity Categories" width="396" height="315" hspace="20" align="left" style="float:left" /></p></td>
    <td><p class="greenSubtitle">What do the toxicity categories mean?</p>
      <p>The process used to characterize the magnitude of toxicity at each site was designed to take into consideration the widely varying number of samples
        and test endpoints (such as fish or crustacean survival) among sites. If any toxic samples were measured for a site, the site was categorized based on
        the most sensitive endpoint. This process considers both individual sample results and the mean results for sites with multiple samples.</p>
      <ul>
        <li><strong>Toxic</strong> indicates survival or algal growth in a sample is significantly lower than the control.</li>
        <li><strong>High toxicity thresholds</strong> specific to each test endpoint were calculated using a method developed for sediment quality evaluation (<a href="https://ftp.sccwrp.org/pub/download/DOCUMENTS/TechnicalReports/503_toxicity_indicator_methods.pdf" target="_blank">Bay
          et al., 2007</a>).</li>
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<p class="footer">( Updated 
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  ) </p>
<p>&nbsp;</p>
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