Hancock, ME
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 Hancock in Maine · Population: 56,084
TRI sites such as Hinckley Co; Penobscot Bay Terminals DBA Webber Tanks Inc; Rtwb Llc.; SDWIS systems such as TOWN OF BAR HARBOR- WATER DIVISION; ELLSWORTH WATER DEPARTMENT; SOUTHWEST HARBOR WATER & SEWER DISTRICT; NPL sites such as Callahan Mine anchor Hancock, ME's EPA extract. Derived burden score 38/100 (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 Hancock include ELLSWORTH WATER DEPARTMENT; SOUTHWEST HARBOR WATER & SEWER DISTRICT; FRANKLIN WATER DEPARTMENT, while Hinckley Co leads reported TRI pounds among local Form R filers. AQS median AQI 37 / peak 105 in 2024.
Burden score 38/100 (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 Hancock -- 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 Hancock, ME: EPA TRI 2023 reporting year
Same facilities, both years
+17.0%
1 facilities that filed in 2022 and 2023
Whole inventory
+17.0%
5.1 thousand lb → 5.9 thousand lb, every facility that filed
- Hancock, ME's total reported releases rose from 5.1 thousand lb in 2022 to 5.9 thousand lb in 2023, based on EPA TRI filings.
- Hancock, ME's air releases rose from 5.1 thousand lb in 2022 to 5.9 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 | 334 (91%) | 31 | 1 | 105 |
| 2023 | 314 (86%) | 51 | 0 | 93 |
| 2022 | 326 (90%) | 34 | 1 | 112 |
| 2021 | 324 (89%) | 38 | 3 | 133 |
| 2020 | 336 (92%) | 29 | 1 | 105 |
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 Maine, see the EPA's AirNow.gov.
Water Systems (22)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| TOWN OF BAR HARBOR- WATER DIVISION | 4,443 | 0 |
| ELLSWORTH WATER DEPARTMENT | 3,910 | 22 |
| SOUTHWEST HARBOR WATER & SEWER DISTRICT | 2,480 | 7 |
| MOUNT DESERT WATER DIST NORTH | 1,623 | 0 |
| CASTINE WATER DEPARTMENT | 983 | 0 |
| MOUNT DESERT WATER DIST -SEAL | 865 | 0 |
| WINTER HARBOR WATER DISTRICT | 700 | 0 |
| FRANKLIN WATER DEPARTMENT | 443 | 1 |
| LONG POND WATER DISTRICT | 308 | 58 |
| COLD SPRING WATER COMPANY | 305 | 0 |
| PARKER RIDGE RETIREMENT COMMUNITY | 120 | 0 |
| SILVER LAKE ESTATES | 110 | 0 |
| BIRCH TREE MEADOWS MHP | 105 | 3 |
| INDIAN RUN ESTATES LLC | 103 | 0 |
| HANCOCK VILLAGE MHP | 73 | 3 |
| HOLDEN SQUARE APARTMENTS | 63 | 2 |
| BLUE HILL TERRACE | 60 | 6 |
| CRESCENT MOBILE HOME PARK | 55 | 0 |
| COASTAL ESTATES | 48 | 0 |
| STONINGTON MANOR | 44 | 6 |
| BIRCH HAVEN TRAILER PARK | 43 | 3 |
| SOUTH PENOBSCOT WATER ASSOCIATION | 38 | 0 |
TRI Facilities (3)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Hinckley Co | 34.5K lbs |
| 2 | Penobscot Bay Terminals DBA Webber Tanks Inc | 585 lbs |
| 3 | Rtwb Llc. | 0 lbs |
Superfund Sites (1)
| Site Name | Status | HRS Score |
|---|---|---|
| Callahan Mine | NPL Site | 50.00 |
Cities in Hancock (17)
Frequently Asked Questions
What is the environmental risk level in Hancock, Maine? ▼
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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.