Frequent Questions

Can I check on the formula to compute LRAA for disinfectant byproducts? For instance, I am measuring every month, but for one particular month I do not have the data. What should the value for that month be? Will the LRAA for that month be same as the pre

The Stage 2 Disinfection Byproducts Rule specifies that the LRAA is the average of sample analytical results for samples at a particular monitoring location during the previous four calendar quarters.  So, samples are taken quarterly at a monitoring frequency of every 90 days.  The system should use monitoring results that are approximately 90 days apart between quarters to calculate the LRAA.  For more information on the calculation of the LRAA please see: http://water.epa.gov/lawsregs/rulesregs/sdwa/stage2/compliance.cfm.

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