Skip to Content


National Primary Drinking Water Regulations: Stage 2 Disinfectants and Disinfection Byproducts Rule

Document Details

Information about this document as published in the Federal Register.

Document Statistics
Document page views are updated periodically throughout the day and are cumulative counts for this document. Counts are subject to sampling, reprocessing and revision (up or down) throughout the day.
Published Document

This document has been published in the Federal Register. Use the PDF linked in the document sidebar for the official electronic format.

Start Preamble Start Printed Page 37168 End Preamble Start Supplemental Information


In rule document 06-3 beginning on page 388 in the issue of Wednesday, January 4, 2006, make the following corrections:


On page 481, in § 141.31(c)(1) the table is corrected to read as set forth below:

MethodologySM (19th or 20th ed)SM Online 2ASTM methodEPA methodResidual measured 1
Free Cl2Combined Cl2Total Cl2ClO2
Amperometric Titration4500-Cl D4500-Cl D-00D 1253-86 (96), 03XXX
Low Level Amperometric Titration4500-Cl E4500-Cl E-00X
DPD Ferrous Titrimetric4500-Cl F4500-Cl F-00XXX
DPD Colorimetric4500-Cl G4500-Cl G-00XXX
Syringaldazine (FACTS)4500-Cl H4500-Cl H-00X
Iodometric Electrode4500-Cl I4500-Cl I-00X
DPD4500-ClO2 DX
Amperometric Method II4500-ClO2 E4500-ClO2 E-00X
Lissamine Green Spectrophotometric327.0 Rev 1.1X
1 X indicates method is approved for measuring specified disinfectant residual. Free chlorine or total chlorine may be measured for demonstrating compliance with the chlorine MRDL and combined chlorine, or total chlorine may be measured for demonstrating compliance with the chloramine MRDL.
2 The Standard Methods Online version that is approved is indicated by the last two digits in the method number which is the year of approval by the Standard Method Committee. Standard Methods Online are available at
End Supplemental Information

[FR Doc. C6-3 Filed 6-28-06; 8:45 am]