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Hi3 Water

Hawaii Water Assets

Pacific

Hawaii's unique volcanic geology creates basal lens aquifers recharged by tropical rainfall. Water is managed under the public trust doctrine with a state water code.

Public Trust5 counties tracked2036 active alerts
6,701
Total Assets
42.4
Avg WIS
1,776
Verified
1
High WIS (75+)

Hawaii Water Intelligence Report

Hi3 Water tracks 6,701 water assets across Hawaii, spanning 5 counties and 7 distinct asset types. The average Water Intelligence Score (WIS) across Hawaii is 42.4/100, with 1 assets scoring in the high-value range (75+). Hawaii operates under Public Trust water law, which directly affects water rights acquisition and asset valuation in this state.

The dominant water asset type in Hawaii is Well (4,804 assets, avg WIS 42.3). The highest concentration is in Honolulu County with 2,469 tracked assets.

2,036 active regulatory alerts are currently tracked in Hawaii, including EPA violations, drought declarations, and state water board enforcement actions. Always check the regulatory intelligence for any asset before making acquisition decisions.

Data sources: USGS Water Data, EPA ECHO, state water boards, and verified field reports. Water Intelligence Scores are computed across flow rate, geological stability, legal accessibility, sustainability, and rarity. Report last updated: June 29, 2026.

Asset Types in Hawaii

Well
4,804
Avg WIS 42.3
River
1,295
Avg WIS 42.1
Spring
262
Avg WIS 41.0
Reservoir
170
Avg WIS 50.6
Lake
166
Avg WIS 42.1
Aquifer
3
Avg WIS 70.7
Fossil Water
1
Avg WIS 77.0

Intelligence Grade Distribution

How Hawaii assets are graded

S (≥90) — Exceptional0 (0.0%)
A (75-89) — Excellent1 (0.0%)
B (55-74) — Good64 (1.0%)
C (35-54) — Fair6,636 (99.0%)
D (<35) — Limited0 (0.0%)

Regulatory Alerts

Drought, EPA violations, and enforcement actions affecting Hawaii

6
critical
15
high
2009
medium
6
low
0
info
Ka Loko Reservoir near Kilauea, Kauai, HI — Gage Height 19.7 ft
usgs_flood · flood_warning
Ku Tree Reservoir near Wahiawa, Oahu, HI — Gage Height 17.2 ft
usgs_flood · flood_warning
Right Branch Lawai Stream nr Umauma Rd, Kauai, HI — Gage Height 12.3 ft
usgs_flood · flood_warning

Top Counties in Hawaii

Honolulu
2,469 assetsWIS 42
Maui
1,101 assetsWIS 42
Hawaii
762 assetsWIS 42
Kauai
536 assetsWIS 42
Kalawao
8 assetsWIS 43

Aquifer Type Mix

unconfined
210
Avg WIS 46
confined
39
Avg WIS 53
fossil
1
Avg WIS 77

Top 10 Water Assets in Hawaii

Ranked by Water Intelligence Score — Hawaii's highest-scoring springs, wells, and aquifers.

View all on map
  1. 1

    Deep Basal Fossil Aquifer — Big Island Hawaii

    Fossil Water
    Hawaii County·500 GPM
    77
    WIS
  2. 2

    Hawaiian Volcanic-Rock Aquifer — Maui Central Valley

    Aquifer
    Maui County·1,500 GPM
    72
    WIS
  3. 3

    Hawaiian Volcanic-Rock Aquifer — Pearl Harbor Basin (Oahu)

    Aquifer
    Honolulu County·3,000 GPM
    72
    WIS
  4. 4

    Hawaiian Sedimentary Aquifer — Oahu Caprock

    Aquifer
    Honolulu County·200 GPM
    68
    WIS
  5. 5

    Alexander

    Reservoir
    ·278,724 GPM
    67
    WIS
  6. 6

    Aepoalua Reservoir

    Reservoir
    ·31,418 GPM
    66
    WIS
  7. 7

    Pauwela Reservoir

    Reservoir
    ·264,810 GPM
    66
    WIS
  8. 8

    Mimino Reservoir

    Reservoir
    ·448,831 GPM
    66
    WIS
  9. 9

    Napili 2-3 Desilting Basin

    Reservoir
    ·462,296 GPM
    66
    WIS
  10. 10

    Elima Reservoir

    Reservoir
    ·254,487 GPM
    66
    WIS
Avg Flow Rate
1,179,612 GPM
Avg Depth
324 ft
For Sale
0
Fossil Water
1

Explore Hawaii on the Interactive Map

View all 6,701 water assets, aquifer boundaries, water rights data, and regulatory alerts for Hawaii.

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