Frequent Questions

What if a system?s high TTHM site and high HAA5 site are the same location?

A system cannot use the same site as both a high TTHM and high HAA5 site. In this case, the site would be selected as the high TTHM site. The next highest HAA5 site would be selected as the high HAA5 site even though the highest HAA5 reading occurs at the high TTHM site.

For additional guidance on the Stage 2 Disinfectants and Disinfection Byproducts rule please visit http://water.epa.gov/lawsregs/rulesregs/sdwa/stage2/regulations.cfm.

Have more questions? Submit a request