allowing subdivision regulations concerning water supply.

HB 1120 requires local planning boards to adopt subdivision regulations for developments with 4 or more units, mandating water supply studies to confirm adequate water quantity for current, proposed, and future uses. It also establishes minimum on-lot private well testing requirements and ensures protection of water-dependent natural resources. The bill clarifies that developers must cover associated costs for these studies and testing, while excluding community water systems and large groundwater withdrawals regulated under existing laws. This directly affects subdivision developers, local planning boards, and property owners with private wells in affected areas.