"Total trihalomethanes (TTHM)" means the sum of the concentration in mg/L of the trihalomethane compounds trichloromethane (chloroform), dibromochloromethane, bromodichloromethane, and tribromomethane (bromoform), rounded to 2 significant figures.
N.H. Admin. Code § Env-Ws 302.82
#8498, eff 11-30-05