Important Information About Your Drinking Water: Trenton Water Works Had Levels of Total Trihalomethanes (TTHM) Above the Safe Drink Water Act Rules. TWW violated Safe Drinking Water Act standards, exceeding the Maximum Contaminant Level (MCL) for Total Trihalomethanes (TTHM) from July 1, 2021, to September 30, 2021. See the Tier 2 public notice issued by mail on December 11.