HI HB1691

Requires newly installed or modified individual wastewater systems to include denitrification capacity if located within 200 feet of a shoreline.

Requires denitrification capacity for wastewater systems at or below 1,500 feet above sea level if the substrate is less than 5,000 years old and has low nutrient holding capacity, low shrink-swell characteristics, and very fast water permeability per the Hawaii soil atlas.

Defines "denitrification capacity" as certification meeting National Sanitation Foundation/American National Standards Institute standard 245 for on-site residential wastewater treatment.

Effective date is July 1, 2050.