Maui, 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 Maui in Hawaii · Population: 164,632
TRI sites such as Maui Electric Co Ltd Kahului Generating Station; Maui Electric Co Ltd Maalaea Generating Station; Maui Electric Co Ltd Miki Basin Generating Station; SDWIS systems such as WAILUKU; MAKAWAO; LAHAINA anchor Maui, HI's EPA extract. Derived burden score 40/100 (Moderate 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 Maui include MAKAWAO; LAHAINA; LOWER KULA, while Maui Electric Co Ltd Kahului Generating Station leads reported TRI pounds among local Form R filers. AQS median AQI 21 / peak 101 in 2024.
Burden score 40/100 (Moderate 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 Maui -- 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 Maui, HI: EPA TRI 2023 reporting year
Same facilities, both years
-15.3%
4 facilities that filed in 2022 and 2023
Whole inventory
-15.3%
263.6 thousand lb → 223.3 thousand lb, every facility that filed
- Maui, HI's total reported releases fell from 263.6 thousand lb in 2022 to 223.3 thousand lb in 2023, based on EPA TRI filings.
- Maui, HI's off-site transfers fell from 81 lb in 2022 to 9 lb in 2023, based on EPA TRI filings.
- Maui, HI's air releases fell from 263.5 thousand lb in 2022 to 223.3 thousand lb in 2023, based on EPA TRI filings.
Air Quality History (2020–2024)
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 |
|---|---|---|---|---|
| 2024 | 363 (100%) | 0 | 1 | 101 |
| 2023 | 344 (99%) | 2 | 0 | 152 |
| 2022 | 357 (99%) | 4 | 0 | 58 |
| 2021 | 361 (99%) | 2 | 0 | 63 |
| 2020 | 343 (98%) | 6 | 0 | 61 |
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 (31)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| WAILUKU | 74,511 | 0 |
| MAKAWAO | 29,868 | 1 |
| LAHAINA | 20,065 | 1 |
| UPPER KULA | 7,686 | 0 |
| KAPALUA | 4,200 | 0 |
| KAUNAKAKAI | 3,702 | 0 |
| LOWER KULA | 3,522 | 1 |
| HOOLEHUA | 2,400 | 0 |
| HANA | 1,284 | 0 |
| HALEAKALA NATIONAL PARK | 1,200 | 0 |
| UALAPUE | 1,119 | 0 |
| MAUNALOA-KALUAKOI | 1,000 | 1 |
| HANA WATER SYSTEMS - SOUTH | 816 | 0 |
| MAHANALUA NUI SUBDIVISON | 606 | 0 |
| KAWELA PLANTATION | 553 | 0 |
| KUALAPUU | 500 | 0 |
| KALAE | 360 | 0 |
| KEANAE | 270 | 0 |
| HANA WATER SYSTEMS - NORTH | 160 | 0 |
| KAHAKULOA WATER CO. | 150 | 1 |
| NAHIKU | 107 | 0 |
| OLOWALU | 100 | 0 |
| MAUNAOLU PLANTATION | 100 | 0 |
| KIPU | 80 | 0 |
| KULA NANI | 80 | 0 |
| WEST KUIAHA MEADOWS | 60 | 0 |
| HONOKOHAU | 42 | 0 |
| BALDWIN RANCH ESTATES | 32 | 0 |
| VILLA ROSE | 30 | 2 |
| MAUI HIGHLANDS | 26 | 0 |
| HAIKU TOWN WATER ASSOCIATION, INC. | 20 | 0 |
TRI Facilities (4)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Maui Electric Co Ltd Kahului Generating Station | 770.2K lbs |
| 2 | Maui Electric Co Ltd Maalaea Generating Station | 435.5K lbs |
| 3 | Maui Electric Co Ltd Miki Basin Generating Station | 241 lbs |
| 4 | Maui Electric Co Ltd Palaau Generating Station | 217 lbs |
Cities in Maui (10)
Frequently Asked Questions
What is the environmental risk level in Maui, Hawaii? ▼
Are there Superfund sites in Maui? ▼
How many toxic release facilities are in Maui? ▼
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Is the drinking water safe in Maui? ▼
What environmental agencies cover Maui? ▼
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.