Clean Water Act Analytical Methods

Methods Update Rule - 2015

""Rule Summary

EPA is proposing:
  • revised Agency analytical methods
  • revised methods published by voluntary consensus standard bodies, such as ASTM International and the Standard Methods Committee
  • methods positively reviewed under the Alternate Test Procedures (ATP) program
  • changes to clarify the procedures for EPA approval of nationwide and limited use ATPs
  • amendments to the procedure for determination of the method detection limit (MDL).
The proposed changes:
  • provide increased flexibility to the regulated community, improve data quality, and update the methods, to keep current with technology advances
  • clarify the process for requesting limited use or nationwide review of ATPs
  • address laboratory contamination issues related to the MDL and better account for intra-laboratory variability.

The public comment period closed on April 20, 2015.

Proposed Rule

Background Information

Additional Information

For further information on the proposed rule, please contact Adrian Hanley ( or 202-564-1564.