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Revised Fact Sheets on Chloral Hydrate and Monochloramine submission

This submission reflects the views of
Organisation Name: 
Central Highlands Water
Please identify the best term to describe the Organisation: 
Personal Details
Questions for Public Consultation
5. Is the information that is presented in the fact sheet relevant and easy to understand?: 

Despite current wording in the factsheet, there is still confusion in the industry as to the guideline that applies to routine analytical data.  As all commonly used measurement techniques (including the reference DPD-ferrous titrimetric method) report monochloramine as Cl2/L equivalent, it should be clearly referenced in this way.  In fact, I cannot see a benefit in referring to the 3mg/L value (as monochloramine) under the guideline heading – as it just creates confusion.  This would also apply to Table 10.5 in the body of the ADWG.  This may be perpetuated by the fact that the WHO Guidelines for Drinking Water Quality refer to 3mg/L as monochloramine for the guideline value – despite no results being reported in this way. 

6. Do you have any comments on the rounding process that has been used in the calculation to derive the guideline value for monochloramine?: 

I do not believe that rounding the monochloramine as Cl2/L equivalent up to 5 mg/L is warranted.  As most DPD analytical techniques are accurate to +/-0.1 mg/L, the guideline figure should be changed to 4.5 mg/L.  For clarity in the calculations then, the reference to the monochloramine value [if required] as monochloramine should be 3.3 mg/L.

Page reviewed: 19 December, 2014