The LT2 Enhanced Surface Water Treatment Rule added tests that were not in the original rule. Which tests were added?

The LT2 Enhanced Surface Water Treatment Rule added tests that were not in the original rule. Which tests were added?

• A. Cryptosporidium and turbidity
• B. Cryptosporidium, E. coli, and turbidity
• C. Cryptosporidium and Giardia
• D. Giardia and E. coli

Answer: (B)

LT2 adds monitoring targets to verify treatment effectiveness against microbial contaminants, focusing on what influences disinfection and filtration performance. Specifically, it requires testing for Cryptosporidium due to its chlorine resistance, using E. coli as a fecal indicator of contamination, and tracking turbidity because higher particle loads can shield microbes and reduce disinfection efficiency. This combination helps utilities determine if enhanced treatment or adjustments are needed. That’s why Cryptosporidium, E. coli, and turbidity are the tests added.

LT2 adds monitoring targets to verify treatment effectiveness against microbial contaminants, focusing on what influences disinfection and filtration performance. Specifically, it requires testing for Cryptosporidium due to its chlorine resistance, using E. coli as a fecal indicator of contamination, and tracking turbidity because higher particle loads can shield microbes and reduce disinfection efficiency. This combination helps utilities determine if enhanced treatment or adjustments are needed. That’s why Cryptosporidium, E. coli, and turbidity are the tests added.