Standard Methods 21st edition

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Standard Methods 21st edition

Postby sreed » Tue Apr 26, 2011 11:42 am


I work for a wastewater lab. We currently use the 20th edition of Standard Methods for the Examination of Water and Wastewater. Are we required to purchase the 21st edition, or can we continue to use the 20th edition? I am in the process of updating our Quality Manual and SOPs. I appreciate your help in this pressing matter.
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Re: Standard Methods 21st edition

Postby silkylabie » Fri Apr 29, 2011 8:21 am

Most 20th edition methods are currently recognized by EPA. To determine whether or not the methods you are using are consistent with the regulations, go to ... onCode=CFR which is a link to the CFR. Selection the appropriate date (for title 40, the most recently posted is 2010), then the title (40), then the subpart (D) then the applicable part (136 for water and waste water, 141, or 142 for drinking water. 136.3 will give you a list of the currently "approved" water methods. Drinking water methods are a little more difficult, but I did search for the methods for metals, and the 20th edition is listed.
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