North Slope Borough, AK
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 North Slope Borough in Alaska · Population: 10,891
TRI sites such as Northern Oilfield Solutions LLC Prudhoe Bay Bulk Facility; Halliburton Prudhoe Bay Field Camp (north Slope); Halliburton Prudhoe Bay Baroid; SDWIS systems such as MOA MUNICIPALITY OF ANCHORAGE; BARROW UTILITIES & ELEC. COOP., INC. (BU; GIRDWOOD WATER SYSTEM anchor North Slope Borough, AK's EPA extract. Derived burden score 24/100 (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 North Slope Borough include BARROW UTILITIES & ELEC. COOP., INC. (BU; NSBU - POINT HOPE; NSBU - ANAKTUVUK PASS, while Northern Oilfield Solutions LLC Prudhoe Bay Bulk Facility leads reported TRI pounds among local Form R filers. AQS median AQI 5 / peak 32 in 2024.
Burden score 24/100 (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 North Slope Borough -- 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.
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 | 120 (100%) | 0 | 0 | 32 |
| 2023 | 120 (99%) | 1 | 0 | 77 |
| 2022 | 95 (95%) | 4 | 0 | 170 |
| 2021 | 113 (99%) | 1 | 0 | 53 |
| 2020 | 111 (99%) | 1 | 0 | 54 |
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 Alaska, see the EPA's AirNow.gov.
Water Systems (12)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| MOA MUNICIPALITY OF ANCHORAGE | 221,351 | 0 |
| BARROW UTILITIES & ELEC. COOP., INC. (BU | 4,900 | 2 |
| GIRDWOOD WATER SYSTEM | 2,625 | 0 |
| NSBU - POINT HOPE | 881 | 8 |
| THE WATER SERVICE | 638 | 0 |
| NSBU - WAINWRIGHT | 600 | 0 |
| NSBU - NUIQSUT | 443 | 0 |
| NSBU - ANAKTUVUK PASS | 350 | 1 |
| NSBU - KAKTOVIK (BARTER IS) | 292 | 0 |
| NSBU - ATQASUK | 284 | 0 |
| NSBU - POINT LAY | 237 | 0 |
| SAINT GEORGE WATER SYSTEM | 65 | 1 |
TRI Facilities (3)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Northern Oilfield Solutions LLC Prudhoe Bay Bulk Facility | 488 lbs |
| 2 | Halliburton Prudhoe Bay Field Camp (north Slope) | 3 lbs |
| 3 | Halliburton Prudhoe Bay Baroid | 1 lbs |
Cities in North Slope Borough (4)
Frequently Asked Questions
What is the environmental risk level in North Slope Borough, Alaska? ▼
Are there Superfund sites in North Slope Borough? ▼
How many toxic release facilities are in North Slope Borough? ▼
What is the air quality in North Slope Borough? ▼
Is the drinking water safe in North Slope Borough? ▼
What environmental agencies cover North Slope Borough? ▼
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.