PlainEnviro

Guam, GU

Moderate Risk (37/100)

A PlainEnviro-computed score from reported facility/violation counts, not an official EPA rating, health forecast, or population-adjusted rate. See methodology.

Environmental data for Guam in Guam

Guam, GU is tracked across three EPA datasets covering 10 Toxics Release Inventory (TRI) facilities, 3 Safe Drinking Water Act systems, and 0 Superfund National Priorities List sites. Together these generate an environmental burden score of 37/100 (Moderate Risk), calibrated against national distributions for facility density, chemical release volume, Superfund concentration, and water-system health violations.

Industrial disclosures inside the county total 2.0M lbs of reported toxic releases under EPCRA Section 313, while 2 water systems carry an active health-based violation in the SDWIS record. No EPA Air Quality System monitors currently report data for this county.

All figures below draw directly from federal EPA records, TRI self-reported emissions, SDWIS compliance history, NPL Hazard Ranking System scores, and AQS daily AQI summaries, and are not adjusted, weighted, or forecast. A past violation or elevated score does not itself indicate current unsafe conditions; it documents the regulatory and disclosure history publicly filed with the U.S. Environmental Protection Agency through the most recent reporting cycle.

TRI Facilities
10
Water Systems
3
Superfund Sites
0
Total Releases
2.0M lbs

Water Systems (3)

System Population 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

Cities in Guam (7)

Yigo
Pop: -
2 facilities · 0 water
Mangilao
Pop: -
1 facilities · 3 water
Piti
Pop: -
4 facilities · 0 water
Santa Rita
Pop: -
1 facilities · 0 water
Agat
Pop: -
1 facilities · 0 water
Dededo
Pop: -
1 facilities · 0 water
Ordot
Pop: -
0 facilities · 0 water

Frequently Asked Questions

What is the environmental risk level in Guam, Guam? ▼
Guam, GU has an environmental risk score of 37/100 (Moderate Risk), based on 10 TRI facilities, 0 Superfund sites, and 3 water systems on record. 2 water systems have health-based violations. Source: EPA TRI, SDWIS, and Superfund NPL.
Are there Superfund sites in Guam? ▼
No Superfund National Priorities List (NPL) sites are currently registered in Guam, GU in the EPA database.
How many toxic release facilities are in Guam? ▼
Guam, GU has 10 TRI-reporting facilities on record with the EPA Toxic Release Inventory, with a combined total of 2.0M lbs in reported toxic releases. TRI facilities self-report annual chemical release data to the EPA.
What is the air quality in Guam? ▼
Air quality monitoring data (EPA AQS) is not available for Guam, GU. This may indicate no EPA monitoring stations are located in the county. For regional air quality data, see the state environmental profile or visit EPA's AirNow.gov.
Is the drinking water safe in Guam? ▼
Guam, GU has 3 EPA-regulated water systems. 2 systems have reported health-based violations (MCL exceedances). A past violation does not necessarily mean water is currently unsafe. For current water quality, contact your local water utility. Source: EPA SDWIS.
What environmental agencies cover Guam? ▼
Environmental compliance in Guam, Guam is overseen by the U.S. Environmental Protection Agency (EPA) at the federal level and the Guam state environmental agency. Facilities report to the EPA Toxic Release Inventory, water systems are regulated under the Safe Drinking Water Act, and contaminated sites are managed under the Superfund program. Contact your state environmental agency for local concerns.

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.

Related Guides

Understanding EPA Data
How EPA collects and publishes environmental data
Environmental Justice
Who lives near polluters and environmental hazards
How to Check Environmental Quality
Step-by-step guide to checking your local environment

Read our methodology - how this data is sourced, computed, and verified.

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Data sourced from U.S. EPA environmental datasets. See our methodology for details. Retrieved and formatted by PlainEnviro Editorial