1. LawStack
  2. Title 40 - Protection of Environment
  3. Chapter I - ENVIRONMENTAL PROTECTION AGENCY
  4. Subchapter D - WATER PROGRAMS
  5. Part 141 - NATIONAL PRIMARY DRINKING WATER REGULATIONS
  6. Subpart T - Enhanced Filtration and Disinfection—Systems Serving Fewer Than 10,000 People
  7. Topic - Disinfection Benchmark
  8. 40 CFR § 141.543
40 CFR § 141.543
How is the disinfection benchmark calculated?
June 9, 2020
CFR

If your system is making a significant change to its disinfection practice, it must calculate a disinfection benchmark using the procedure specified in the following table.

Open Table
To calculate a disinfection benchmark your system must perform the following steps
Step 1: Using the data your system collected to develop the Disinfection Profile, determine the average Giardia lamblia inactivation for each calendar month by dividing the sum of all Giardia lamblia inactivations for that month by the number of values calculated for that month.
Step 2: Determine the lowest monthly average value out of the twelve values. This value becomes the disinfection benchmark.
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§ 141.542 What must my system do if we are considering a significant change to disinfection practices?
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§ 141.544 What if my system uses chloramines, ozone, or chlorine dioxide for primary disinfection?

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