Environment
Maine DEP has mapped 13,434 oil and hazardous material spill locations, 3,787 active petroleum storage tanks, and 3,919 remediation site records.
Current air quality
Worst Air Quality Index reading by area, June 11, 2026
66
Moderate
Eastern Interior
PM2.5
64
Moderate
Southwest Coast
PM2.5
56
Moderate
Northern
PM2.5
35
Good
Mid-Coast
PM2.5
32
Good
High Elevations of Acadia National Park
O3
31
Good
Downeast Coast
O3
23
Good
Western Interior
PM2.5
16
Good
Western Mountains
O3
Source: AirNow (U.S. EPA)
Spill sites by year
Mapped spill locations investigated by DEP
Source: Maine DEP spill response data
What spilled
Most common products at mapped spill sites
Source: Maine DEP spill response data
Where spills happen
Towns with the most mapped spill sites
Source: Maine DEP spill response data
Petroleum tanks by status
All registered storage tanks, above and below ground
Source: Maine DEP registered tanks
Active tanks by town
Towns with the most active registered tanks
Source: Maine DEP registered tanks
Remediation sites by program
Cleanup and institutional-control programs
Source: Maine DEP remediation sites
Coming to this section: interactive maps of spill, tank, and remediation locations. Not all DEP records are mapped — counts here cover spatially located sites only.