With the final rule officially taking effect his month, public water suppliers have 3 years to come into compliance with the new requirements of the Revised Lead and Copper Rule. As many suppliers are aware, this has already begun with the selection of new sampling sites, required by MassDEP when a Public Water System makes a treatment change. Rule changes are extensive, including for school sampling in particular. More information on the final rule can be found here and here. The rule includes a new 10 parts per billion trigger level for lead. The USEPA expects the annual implementation costs for public water suppliers to be as much as $839 million nationwide.