Relating To Waste Management.
SB446 would amend Hawaii’s landfill and waste-management laws to add stronger protections for aquifers and underground drinking water sources. The bill is built around the concern that landfills located mauka of the underground injection control line could threaten groundwater, especially in light of the Red Hill spill and the proposed landfill site near Wahiawa. Beginning July 1, 2025, it would prohibit the construction, modification, or expansion of landfill units or landfill components in those areas unless a buffer zone of at least one-quarter mile is established around the landfill unit.
The bill also narrows how landfill buffer zones are defined and clarifies that continued operation of an existing, properly permitted landfill is allowed so long as it does not require physical expansion or additional permit modification. In addition, SB446 would prohibit the use of fly ash, bottom ash, or combined ash from municipal waste combustors for road building, construction, or as alternative daily cover at landfills, requiring that such ash be disposed of only in double-lined, licensed municipal solid waste or hazardous waste landfills. The measure amends Section 342H-52 of the Hawaii Revised Statutes and is scheduled to take effect on December 31, 2050.
The bill’s impact on state law would be to tighten siting and operational restrictions for landfill units, especially on Oahu and other areas where groundwater protection is a concern. It would expand state-level environmental safeguards by limiting landfill development near underground drinking water resources and by imposing stricter disposal rules for ash byproducts from waste combustors. Counties, the State, and other persons seeking landfill permits would be subject to these new restrictions, and the director’s permitting authority would remain tied to protecting human health and the environment.
The general sentiment reflected in the bill text and voting history is supportive of stronger environmental and public-health protections. The findings emphasize the importance of aquifer preservation and cite local opposition from the Honolulu City Council to landfill placement near underground drinking water sources. Committee votes show the bill advancing with amendments in both the Senate Health and Human Services Committee and the Senate Ways and Means Committee, including a unanimous 5-0 vote in the first committee and a 12-1 vote in the second, suggesting broad support with some limited dissent.
The main point of contention appears to be the balance between landfill capacity/waste-disposal planning and groundwater protection. The bill’s restrictions on landfill siting mauka of the underground injection control line, along with the ash-disposal ban, could affect county solid waste management plans and landfill operations, which may explain why the measure was amended as it moved through committee. The delayed effective date of December 31, 2050 also suggests the bill may have been structured to phase in or align with longer-term waste-management planning.
SB446 would amend Hawaii Revised Statutes section 342H-52 to impose a one-quarter-mile buffer requirement for new, modified, or expanded landfill units mauka of the underground injection control line and to prohibit the use of municipal waste combustor fly ash and bottom ash for road building, construction, or landfill cover. It would affect the State, counties, landfill operators, and waste combustor ash disposal practices by tightening permitting and disposal requirements to protect groundwater and aquifers.
The overall sentiment appears favorable toward environmental protection and drinking-water safety. The bill’s findings frame the measure as a response to the Red Hill contamination incident and concerns about a proposed landfill over the Wahiawa aquifer, and the committee votes show strong support with amendments rather than outright opposition. The 12-1 vote in Ways and Means indicates broad but not unanimous agreement.
The likely areas of contention are landfill siting flexibility, county solid waste planning, and the practical effects of restricting ash reuse and landfill expansion. Opponents or skeptics may be concerned about limiting available landfill locations, increasing disposal costs, or complicating waste-management operations, while supporters emphasize aquifer protection and public health. The amendments suggest lawmakers were working to refine the scope of the restrictions and the treatment of existing permitted facilities.