Regulations
On March 12, 2007, the U.S. Environmental Protection Agency (EPA) promulgated the Methods Update Rule (MUR). This rule removes old EPA methodology and approves more recent methodology for drinking water and wastewater methods found in 40 CFR Parts 141 and 136 respectively. The following links provide more information on these rules as well as links to the rules themselves.
EPA Clarification letter: The EPA issued a letter regarding the flexibility allowed at 40 CFR Part 136.6 To view that letter in pdf, click here.
Standard Methods 21st Edition and On-Line Standard Methods: The EPA has issued a memorandum documenting the approved methods in the 21st edition of Standard Methods and the equivalent On-Line Standard Methods. To view this letter, click here.
For additional information, contact: (803) 896-0970