This bill introduces a new section to RSA 674, specifically addressing zoning ordinances related to single-family residential uses and their required lot sizes in relation to sewer infrastructure. It stipulates that for areas not serviced by municipal or community sewer systems, municipalities cannot mandate larger lot sizes than those required by the Department of Environmental Services for individual sewage disposal systems, unless they can provide empirical evidence demonstrating that community health or safety would be significantly compromised. For lots that are serviced by municipal or community sewer infrastructure, the bill sets a maximum lot size requirement of 22,000 square feet, again contingent on the municipality proving that larger sizes are necessary for health or safety reasons.

Additionally, the bill clarifies that the new requirements will not affect the development potential of lots created before July 1, 2025, and it does not override existing municipal zoning regulations unrelated to minimum lot sizes. The act is set to take effect on July 1, 2025. The fiscal impact of this legislation is expected to be indeterminable for local expenditures, as municipalities may incur costs related to amending zoning ordinances and gathering necessary empirical evidence to justify any deviations from the established lot size requirements.