Guam, GU
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 Guam in Guam
TRI sites such as Naval Base Guam-Apra Harbor WWTP; Guam Power Authority; South Pacific Petroleum Corp; SDWIS systems such as GWA NORTHERN WATER SYSTEM; GWA CENTRAL WATER SYSTEM; GWA SOUTHERN WATER SYSTEM; NPL sites such as Andersen Air Force Base; Ordot Landfill anchor Guam, GU's EPA extract. Derived burden score 47/100 (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 Guam include GWA CENTRAL WATER SYSTEM; GWA SOUTHERN WATER SYSTEM, while Naval Base Guam-Apra Harbor WWTP leads reported TRI pounds among local Form R filers. No AQS county monitors report here.
Burden score 47/100 (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 Guam -- 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 Guam, GU: EPA TRI 2023 reporting year
Same facilities, both years
-31.7%
8 facilities that filed in 2022 and 2023
Whole inventory
-31.6%
341.4 thousand lb → 233.4 thousand 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.
- Guam, GU's total reported releases fell from 341.1 thousand lb in 2022 to 232.9 thousand lb in 2023, based on EPA TRI filings.
- Guam, GU's air releases fell from 129.0 thousand lb in 2022 to 32.4 thousand lb in 2023, based on EPA TRI filings.
- Guam, GU's land releases rose from 1.5 thousand lb in 2022 to 1.8 thousand lb in 2023, based on EPA TRI filings.
- Guam, GU's water releases fell from 210.5 thousand lb in 2022 to 198.7 thousand lb in 2023, based on EPA TRI filings.
Water Systems (3)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| GWA NORTHERN WATER SYSTEM | 139,207 | 0 |
| GWA CENTRAL WATER SYSTEM | 21,398 | 4 |
| GWA SOUTHERN WATER SYSTEM | 5,801 | 2 |
TRI Facilities (10)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Naval Base Guam-Apra Harbor WWTP | 1.1M lbs |
| 2 | Guam Power Authority | 756.7K lbs |
| 3 | South Pacific Petroleum Corp | 63.1K lbs |
| 4 | Andersen Air Force Base (us Air Force) | 14.3K lbs |
| 5 | Mobil Oil Guam Inc (cabras Island Terminal) | 13.6K lbs |
| 6 | Yigo Power Plant | 3.7K lbs |
| 7 | Tenjo Vista Power Plant | 1.4K lbs |
| 8 | Dededo Combustion Turbine Generating Facility | 479 lbs |
| 9 | Tristar Terminals Guam Inc. | 237 lbs |
| 10 | Hawaiian Rock Products-Guam | 187 lbs |
Superfund Sites (2)
| Site Name | Status | HRS Score |
|---|---|---|
| Andersen Air Force Base | NPL Site | 50.00 |
| Ordot Landfill | NPL Site | 0.00 |
Cities in Guam (7)
Frequently Asked Questions
What is the environmental risk level in Guam, Guam? ▼
Are there Superfund sites in Guam? ▼
How many toxic release facilities are in Guam? ▼
What is the air quality in Guam? ▼
Is the drinking water safe in Guam? ▼
What environmental agencies cover Guam? ▼
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.