PlainLakes

State water-quality picture · #50 by reported lake-type waterbodies

Hawaii lakes and reservoirs

Every figure on this page is computed from the assessment decisions Hawaii reported to the U.S. Environmental Protection Agency under Clean Water Act sections 303(d) and 305(b) (reporting cycles 2011), plus daily water-level observations from the U.S. Geological Survey.

2
Reported waterbodies
2
Not supporting a use
Not reported
Fish use assessments
1
Gauged lake

Hawaii in one line

2 lake-type waterbodies in Hawaii are reported to EPA ATTAINS across reporting cycles 2011: 2 assessed as not supporting at least one designated use, 0 fully supporting, and 0 without a definitive overall verdict. The most-listed impairment cause is Turbidity, on 2 waterbodies.

2
reported waterbodies
2
not supporting a use
0
fully supporting
1
lakes with a linked USGS gauge

An unassessed waterbody is neither confirmed clean nor confirmed impaired; states assess on multi-year cycles.

Hawaii's smaller reported lake-type inventory

At 2 units, Hawaii is in the lowest third of state lake-type registers. The charts below describe that compact filing set, not a national-scale inventory.

Data updated 2026-08-17

According to the U.S. Environmental Protection Agency's ATTAINS program, Hawaii reported 2 lake-type waterbodies in Hawaii in the August 2026 extract. See our methodology for filer attribution and multi-year reporting cycles.

Most-listed impairment causes in Hawaii

Waterbodies carrying each listed cause, most first

waterbodies

What this shows Turbidity is the most-listed impairment cause in Hawaii, on 2 of the lake-type waterbodies reported there.

Source EPA ATTAINS As of Reporting cycles 1987–2026

Assessment outcomes in Hawaii

Overall-status mix across reported lake-type waterbodies

waterbodies

What this shows Most reported waterbodies in Hawaii do not yet carry a definitive overall verdict.

Source EPA ATTAINS As of Reporting cycles 1987–2026

By size

Largest assessed lakes in Hawaii

By assessed acreage as reported in ATTAINS. Acreage is the assessed unit's size, which can differ from a lake's full surface area.

# Waterbody Assessed acres
1 Wahiawa Reservoir Not Supporting 4.69
2 Salt Lake Not Supporting 0.26

By cause count

Most-listed waterbodies in Hawaii

Waterbodies carrying the most listed impairment causes among the lake-type units reported by Hawaii.

# Waterbody Listed causes
1 Wahiawa Reservoir Not Supporting 4
2 Salt Lake Not Supporting 2

Gauge network

Lakes with a daily level record in Hawaii

Lakes with a linked USGS gauge and a daily water-level record. Readings are daily-batch snapshots, not real-time.

Hawaii's register size against its impaired share, nationally

Assessed-corpus size does not predict impaired share: a state with a large register can still post a low not-supporting rate, and a small register can post a high one.

Source: EPA ATTAINS, states above the sample floor 2×2 strategic matrix plotting 36 entities by Definitive verdicts (assessed corpus) (X) and Impaired share (%) (Y), with a crosshair dividing the plot into four quadrants. Large corpus, high shareSmall corpus, high shareLarge corpus, low shareSmall corpus, low share 01,0002,0003,0004,0005,000 0%20%40%60%80%100%120% Definitive verdicts (assessed corpus) Impaired share (%) New Hampshire · 2,783, 100%Washington · 393, 100%New Jersey · 604, 96.5%Massachusetts · 718, 94.4%Oregon · 178, 92.7%California · 224, 90.2%New York · 642, 87.7%Illinois · 497, 87.3%Rhode Island · 140, 85%Oklahoma · 195, 78.5%Virginia · 231, 78.4%South Dakota · 186, 78%Kansas · 316, 76.3%Iowa · 203, 67.5%Florida · 1,003, 63.4%Nebraska · 352, 62.2%Indiana · 241, 60.2%North Carolina · 152, 59.2%Utah · 134, 57.5%Missouri · 267, 56.6%Kentucky · 129, 55.8%Colorado · 163, 54.6%Minnesota · 3,364, 53.4%Arkansas · 117, 53%Alabama · 273, 52.4%Georgia · 119, 39.5%South Carolina · 540, 39.3%Michigan · 2,339, 34.5%Connecticut · 139, 31.7%North Dakota · 176, 29.5%Texas · 433, 28.9%Pennsylvania · 516, 26.2%Vermont · 712, 21.6%Idaho · 237, 21.5%Wisconsin · 4,718, 10.4%Maine · 303, 10.2%
Source: EPA ATTAINS, states above the sample floor
NameDefinitive verdicts (assessed corpus)Impaired share (%)
New Hampshire2,783100%
Washington393100%
New Jersey60496.5%
Massachusetts71894.4%
Oregon17892.7%
California22490.2%
New York64287.7%
Illinois49787.3%
Rhode Island14085%
Oklahoma19578.5%
Virginia23178.4%
South Dakota18678%
Kansas31676.3%
Iowa20367.5%
Florida1,00363.4%
Nebraska35262.2%
Indiana24160.2%
North Carolina15259.2%
Utah13457.5%
Missouri26756.6%
Kentucky12955.8%
Colorado16354.6%
Minnesota3,36453.4%
Arkansas11753%
Alabama27352.4%
Georgia11939.5%
South Carolina54039.3%
Michigan2,33934.5%
Connecticut13931.7%
North Dakota17629.5%
Texas43328.9%
Pennsylvania51626.2%
Vermont71221.6%
Idaho23721.5%
Wisconsin4,71810.4%
Maine30310.2%
Source: EPA ATTAINS, states above the sample floor

The crosshair sits at the median across the 36 qualifying states on each axis, not the range midpoint, so it splits the group evenly. Hawaii falls below the sample floor for this comparison and is not plotted.

States with similar inventory scale or impairment load

Two EPA ATTAINS peer sets outside Hawaii. The reporting-practice chart above stays on definitive-verdict share; these neighborhoods are cross-state nearest neighbors on register size and not-supporting counts.

Comparable register size

Nearest states by lake-type units on the register (2 here).

States with a similar not-supporting load

Nearest states by units assessed not supporting a use (2 here). Inventory peers above are omitted.

Peers are nearest-neighbor matches on EPA ATTAINS register size and not-supporting counts among states with at least 25 reported units. Impairment peers skip states already listed in the inventory column so the two link sets stay distinct.

Using this state picture

  • Assessment coverage varies by state; Hawaii's reported universe reflects its own monitoring program, so cross-state comparisons need the definitive-verdict share, not raw counts. National rankings
  • Fish-consumption verdicts here are assessment decisions. Species-level meal advice comes from the state fish-advisory program. Consumption guide
  • Browse every named Hawaii waterbody with a populated record. Browse waterbodies

PlainLakes renders state assessment decisions and federal gauge observations without modification.

Figures on this page are computed from the assessment decisions Hawaii reported to EPA's ATTAINS system and from USGS National Water Information System daily values, no number is typed in by an editor. State counts aggregate every lake-type assessment unit reported by Hawaii, including unnamed units that never receive their own page. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2026-08-17. Primary sources: EPA ATTAINS and USGS National Water Information System.