Is it EPA approved? i.e. can I use it for compliance with my NPDES permit?

The U.S. EPA has issued ATP Case No. N07-0003 in 40 CFR part 136.3 for the use of Nitrate Reductase method for nitrate/nitrite analysis for CWA reporting. The Methods Update Rule, which contains all Alternate Test Procedures for this round, will most likely be promulgated by the end of 2016 if no major challenges are met. However, in the interim, a facility may apply to an EPA Region for a limited-use ATP approval letter for use at that facility.

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