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Water Commission outlines groundwater limits, monitoring gaps and need for more data
Summary
Commission on Water Resource Management staff reviewed how Hawaii manages freshwater: definitions of sustainable yield, designated water-management areas, monitoring gaps and planned deep monitoring wells. Presenters emphasized data shortfalls, climate impacts on recharge and prioritizing Lahaina for updated assessments.
Veil Fujii, planning-branch staff at the Commission on Water Resource Management, gave an overview of the commission’s responsibilities and the technical framework the state uses to manage freshwater.
The commission regulates freshwater quantity across public and private systems under the State Water Code and implements components of the Hawaii Water Plan, including long-range planning, conservation and drought work, and permitting for wells and stream diversions. “You know, nobody owns the water in Hawaii. The state is the trustee,” Fujii said, describing the commission’s role under the public-trust doctrine.
Why it matters: Commission staff said many resource-management decisions rely on scarce data. Fujii and other presenters described statewide counts (376 perennial streams, about 110 aquifer systems, roughly 5,500 known drilled wells and about 1,300 stream diversions) and said the agency’s operating budget and capital-improvement program are limited — Fujii named about $4,000,000 in operating funds and roughly $2,000,000 a year for CIP largely used for deep monitor-well design and construction.
Most important facts
- Sustainable yield definition: Fujii read the Water Code definition that sustainable yield is “the maximum rate at which water may be withdrawn from a water source without impairing the utility or quality of this water source as determined by the commission,” and said the commission uses sustainable-yield numbers for each aquifer system to manage groundwater withdrawals.
- Monitoring gaps and deep monitor wells: staff described a priority to install at least one funded deep monitor well per fiscal year to improve understanding of the freshwater lens and saltwater interface, and said many neighbor-island aquifers lack deep data. Fujii said the commission seeks to “catch up” in data collection and highlighted maps showing monitoring gaps.
- Climate and recharge: in response to questions, staff said rainfall shows a drying trend over the past century and that recharge is likely declining. Fujii noted ongoing uncertainty about how land‑cover change and invasive species affect recharge: “I think any forest is better than none. But whether or not the natives capture more water than the invasives, I think that's getting looked into.”
- Designated water‑management areas and water‑use permits: staff reviewed the difference between statewide permitting (well construction, pump‑installation and stream permits) and the additional water‑use permit issued only inside designated water‑management areas, which allocates how much water an applicant may withdraw and requires more detailed review.
Context and next steps
Staff said Lahaina is a near‑term priority for sustainable‑yield reevaluation and water‑use permit reviews because the designation there generated a large number of permit applications, many still incomplete. The commission also plans a framework update to the Hawaii Water Plan and is reviewing U.S. Geological Survey climate/recharge work to inform future revisions of sustainable yields.
Ending: Commission staff urged more cross‑agency data sharing and said filling staffing and commissioner vacancies would help the agency meet monitoring and permitting priorities.
