Honolulu, 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. This is a different measure than the EJ Screening score for this county, which ranks it by percentile against other tracked counties rather than against these fixed caps.
Environmental data for Honolulu in Hawaii · Population: 1,003,666
TRI sites such as Hawaiian Electric Co Inc Kahe Generating Station; Joint Base Pearl Harbor-Hickam Hawaii; Hawaiian Electric Co Inc Waiau Generating Station; SDWIS systems such as JOINT BASE PEARL HARBOR-HICKAM; SCHOFIELD BARRACKS; MARINE CORPS BASE HAWAII; NPL sites such as Del Monte Corp. (Oahu Plantation); Naval Computer and Telecommunications Area Master Station Eastern Pacific; Pearl Harbor Naval Complex anchor Honolulu, HI's EPA extract. Derived burden score 69/100 (High 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 Honolulu include WAIAWA CORRECTIONAL FACILITY; WAIAHOLE, while Hawaiian Electric Co Inc Kahe Generating Station leads reported TRI pounds among local Form R filers. AQS median AQI 31 / peak 85 in 2024.
Burden score 69/100 (High 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 Honolulu -- 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 Honolulu, HI: EPA TRI 2023 reporting year
Same facilities, both years
-0.9%
20 facilities that filed in 2022 and 2023
Whole inventory
-9.0%
2.1 million lb → 1.9 million lb, every facility that filed
Between the two reporting years, 1 facility filed for the first time and 1 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Honolulu, HI's total reported releases fell from 1.9 million lb in 2022 to 1.9 million lb in 2023, based on EPA TRI filings.
- Honolulu, HI's off-site transfers fell from 30.7 thousand lb in 2022 to 24.1 thousand lb in 2023, based on EPA TRI filings.
- Honolulu, HI's land releases fell from 140.3 thousand lb in 2022 to 123.0 thousand lb in 2023, based on EPA TRI filings.
- Honolulu, HI's water releases fell from 565.1 thousand lb in 2022 to 512.8 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 | 360 (98%) | 6 | 0 | 85 |
| 2023 | 337 (92%) | 27 | 1 | 117 |
| 2022 | 356 (98%) | 9 | 0 | 57 |
| 2021 | 364 (100%) | 1 | 0 | 58 |
| 2020 | 363 (99%) | 3 | 0 | 63 |
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 (20)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| JOINT BASE PEARL HARBOR-HICKAM | 65,230 | 0 |
| SCHOFIELD BARRACKS | 37,920 | 0 |
| MARINE CORPS BASE HAWAII | 16,300 | 0 |
| FORT SHAFTER | 7,067 | 0 |
| NCTAMS EASTPAC | 6,470 | 0 |
| ALIAMANU | 6,406 | 0 |
| LAIE WATER COMPANY | 5,577 | 0 |
| TRIPLER ARMY MEDICAL CNTR | 5,555 | 0 |
| KAMEHAMEHA SCHOOLS | 4,000 | 0 |
| THE QUEEN'S MEDICAL CENTER | 3,440 | 0 |
| DILLINGHAM AIRFIELD | 1,800 | 0 |
| PACIFIC MISSILE RANGE FACILITY | 1,200 | 0 |
| KUNIA VILLAGE | 650 | 0 |
| CAMP STOVER | 595 | 0 |
| WAIAWA CORRECTIONAL FACILITY | 444 | 5 |
| WAIAHOLE | 300 | 1 |
| PUNALU'U | 200 | 0 |
| KAHUKU AIR BASE | 75 | 0 |
| WOODLANDS AT NUUANU | 48 | 0 |
| POAMOHO | 25 | 0 |
TRI Facilities (23)
Superfund Sites (4)
| Site Name | Status | HRS Score |
|---|---|---|
| Del Monte Corp. (Oahu Plantation) | NPL Site | 50.00 |
| Naval Computer and Telecommunications Area Master Station Eastern Pacific | NPL Site | 50.00 |
| Pearl Harbor Naval Complex | NPL Site | 70.82 |
| Schofield Barracks (USARMY) | Deleted NPL Site | 28.90 |
Cities in Honolulu (16)
Frequently Asked Questions
What is the environmental risk level in Honolulu, Hawaii? ▼
Are there Superfund sites in Honolulu? ▼
How many toxic release facilities are in Honolulu? ▼
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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.