Kauai County, HI Water Table Trend
Kauai County, HI: what the water table is actually doing
Kauai County's long-term well puts the trend at 0.8 ft per decade, declining, slower than most declining counties, based on 176 measurements since 1961.
One well stands in for Kauai County's whole aquifer here, the honest simplification every page on this site carries.
What the well actually measured
The most recent reading put water 425.8 ft below land surface. Readings span 1961-04-29 to 2026-06-03, 176 measurements from USGS well USGS-215607159344301 (2-5634-01 Hanapepe Ridge, Kauai, Hi), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
Where Kauai County ranks
Of the 1,449 US counties with a usable trend, Kauai County ranks 1028th from fastest-rising to fastest-declining, 1 is the fastest-rising water table measured, 1449 the fastest-declining. About 73,840 people live in Kauai County, Hawaii. See the fastest-moving counties guide for how Kauai County stacks up against the most extreme cases nationally.
What a declining table means for a well pump
Because Kauai County's water table is actually declining, not just a general worry, a well owner here should consider comparing home-warranty plans that cover well-pump failure before one happens.
A dropping table says nothing about water quality
Whether Kauai County's water table is rising or falling is independent of what's actually in the water. Depletion can concentrate naturally-occurring minerals, so it's worth checking directly with a water test rather than assuming a depth trend says anything about quality.