EPA published a decision in 2013 on the use of an alternative laboratory analytical method for oil and grease. (See CWA Methods Regulatory History.)

• NPDES Chemistry Limited Use Alternate Test Procedure Application (docx; fillable form)(2 pp, 35 K, March 2013)
• NPDES Chemistry Limited Use Alternate Test Procedure Method Documentation Form (docx; fillable form)(4 pp, 60 K, March 2013)
• Performance Comparison Form (Clean Matrix, Laboratory Pure Water) (docx; fillable form)(6 pp, 56 K, March 2013)
• Performance Comparison Form - Effluent Matrix (docx; fillable form)(5 pp, 51 K, March 2013)
• Oil and Grease ATP Comparison Worksheet (spreadsheet)(36 K, February 2013)

• Clean Water Act Analytical Methods Update Rule - Decision on Alternative Oil and Grease Method; Fact Sheet (PDF)(2 pp, 43 K, March 2013)
  Decision on use of ASTM Method D7575
• Guidance for Limited Use Alternate Test Procedure Applications for ASTM Method D7575 for Oil and Grease (PDF)(22 pp, 127 K, March 2013, 821-R-13-006)
  Instructions for demonstrating comparability between EPA-approved methods for measurement of oil and grease in wastewater and ASTM D7575, an alternate method