Kauai, HI
Transparent derived index from EPA TRI / SDWIS / Superfund extracts: not an official EPA rating. Fixed caps: facilities ≤25 pts (50+ = max), log10 releases ≤25 pts, Superfund ≤25 pts (5/site), health-violation systems ≤15 pts (3/system), high-chemical facilities ≤10 pts. Bands: High ≥60, Moderate ≥30. See methodology.
Environmental data for Kauai in Hawaii · Population: 73,610
TRI sites such as Kapaia Power Station; Port Allen Generating Station; US Doe Sandia National Laboratories Kauai Test Facility - Sa; SDWIS systems such as LIHUE-KAPAA; KALAHEO-KOLOA; PRINCEVILLE anchor Kauai, HI's EPA extract. Derived burden score 20/100 (Low Risk) uses fixed national caps on density, log release volume, Superfund count, and health-flagged systems - not an official EPA rating.
Health-flagged SDWIS rows in Kauai include MOLOAA IRRIGATION COOPERATIVE, while Kapaia Power Station leads reported TRI pounds among local Form R filers. AQS median AQI 13 / peak 38 in 2022.
Burden score 20/100 (Low Risk) is the only weighted composite on this page. The tables below list every TRI facility, SDWIS system, and Superfund site EPA has on record for Kauai -- not just the names called out above -- reproducing the disclosure history as filed, not a current-safety verdict. Extract current as of 2026-08-25.
Release-over-release change
What changed for Kauai, HI: EPA TRI 2023 reporting year
Same facilities, both years
-1.0%
3 facilities that filed in 2022 and 2023
Whole inventory
-1.9%
19.2 thousand lb → 18.9 thousand lb, every facility that filed
Between the two reporting years, 0 facilities filed for the first time and 1 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Kauai, HI's total reported releases fell from 19.1 thousand lb in 2022 to 18.9 thousand lb in 2023, based on EPA TRI filings.
- Kauai, HI's air releases fell from 19.1 thousand lb in 2022 to 18.9 thousand lb in 2023, based on EPA TRI filings.
Air Quality History (2020–2022)
EPA Air Quality Index (AQI) data showing how many days per year fall into each air quality category.
| Year | Good | Moderate | Unhealthy (SG) | Max AQI |
|---|---|---|---|---|
| 2022 | 90 (100%) | 0 | 0 | 38 |
| 2021 | 364 (100%) | 0 | 0 | 47 |
| 2020 | 361 (99%) | 4 | 0 | 52 |
Source: EPA Air Quality System (AQS) Annual AQI by County AQI categories: Good (0-50), Moderate (51-100), Unhealthy for Sensitive Groups (101-150), Unhealthy (151-200), Very Unhealthy (201-300), Hazardous (301+)
For real-time air quality readings and pollutant breakdowns in Hawaii, see the EPA's AirNow.gov.
Water Systems (16)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| LIHUE-KAPAA | 34,854 | 0 |
| KALAHEO-KOLOA | 12,660 | 0 |
| PRINCEVILLE | 6,911 | 0 |
| KEKAHA-WAIMEA | 5,998 | 0 |
| HANAPEPE-ELEELE | 5,592 | 0 |
| KILAUEA | 3,420 | 0 |
| ANAHOLA | 2,473 | 0 |
| GAY & ROBINSON | 1,271 | 0 |
| HAENA-WAINIHA | 833 | 0 |
| HANALEI | 500 | 0 |
| WAIALUA SUGAR PUMP 2 | 400 | 0 |
| ANAHOLA FARM LOTS | 385 | 0 |
| KEALIA | 260 | 0 |
| KAHILI MOUNTAIN PARK | 175 | 0 |
| ANINI | 174 | 0 |
| MOLOAA IRRIGATION COOPERATIVE | 100 | 10 |
TRI Facilities (4)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Kapaia Power Station | 74.3K lbs |
| 2 | Port Allen Generating Station | 3.3K lbs |
| 3 | US Doe Sandia National Laboratories Kauai Test Facility - Sa | 182 lbs |
| 4 | US Navy Pacific Missile Range Facility | 7 lbs |
Cities in Kauai (8)
Frequently Asked Questions
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What does this county environmental profile show?
This county environmental profile rolls up EPA Toxics Release Inventory facility reports, Safe Drinking Water Information System public-water-system filings, and Superfund National Priorities List sites for the county boundary defined by the U.S. Census Bureau. Facility counts reflect facilities with a reporting address inside the county, not where downstream environmental effects may be observed. Population figures are from the most recent Census ACS 5-year estimate. The county detail page is updated whenever the upstream EPA programs publish revised data; see the methodology page for the documented ingest cadence and the editorial choices governing how aggregations are computed.
Read our methodology - how this data is sourced, computed, and verified.