EPA-regulated facilities near Portsmouth, NH

There are 1,364 EPA-regulated facilities within 5 miles of Portsmouth, New Hampshire. The most common kinds are hazardous waste (1,049), water discharge (300), air emissions (89). 5 are currently in significant noncompliance, the EPA's designation for the most serious or persistent violations, and 10 have a violation on record. Penalties over the last five years total $326k across 2 sites.

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1,364facilities within 5 miles

5in significant noncompliance

10with a violation on record

$326kin penalties, last 5 years

By category

Category	Facilities
Hazardous waste	1,049
Treatment, storage or disposal	1
Large quantity generators	10
Small quantity generators	125
Transporters	1
Chemical (RMP/TRI)	38
Superfund	5
Air emissions	89
Major sources	6
Synthetic minor sources	11
Minor sources	61
Water discharge	300
Major permits	6
Minor permits	219
Drinking water systems	22
Greenhouse gas reporters	6
Data centers	3
Recycling centers	6

A facility enrolled in several programs counts once in the total and once in each of its categories.

In significant noncompliance

The EPA's designation for its most serious or persistent violations, as of the latest data.

PIERCE ISLAND WASTEWATER TREATMENT PLANT 200 PIERCE ISLAND RD, PORTSMOUTH, NH, 03801 · 2.2 mi Significant noncompliance
SUBCOM CABLE SYSTEMS, LLC. 100 PISCATAQUA DRIVE, NEWINGTON, NH, 03801 · 2.8 mi Significant noncompliance
NEW CASTLE TOWN OF NEW CASTLE COMMONS, NEW CASTLE, NH, 03854 · 3.2 mi Significant noncompliance
NEWINGTON DFSP BUNKER TANK DEMOLITION 0 OFF PATTERSON LANE, NEWINGTON, NH, 03801 · 3.4 mi Significant noncompliance
WALLIS SANDS STATE PARK ROUTE 1-A, RYE, NH, 03870 · 3.5 mi Significant noncompliance

Largest penalties

Penalties assessed over the last five years.

STUDENT TRANSPORTATION OF NEW HAMPSHIRE, INC - PORTSMOUTH 47 EMERY STREET, PORTSMOUTH, NH, 03801 · 1.4 mi $325k in penalties
WAL MART STORE 2398 2200 WOODBURY AVE, NEWINGTON, NH, 03801 · 3.0 mi $990 in penalties

Superfund sites

PEASE AIR FORCE BASE 509 CSG/CC, PORTSMOUTH/NEWINGTON, NH, 03803 · 2.5 mi
PORTSMOUTH NAVAL SHIPYARD SEAVEY ISLAND, KITTERY, ME, 03904 · 2.5 mi
DEFENSE FUEL SUPPLY CENTER 78 PATTERSON LN, PORTSMOUTH, NH, 03801 · 3.5 mi
FWS-GREAT BAY NATIONAL WILDLIFE REFUGE 100 MERRIMAC DRIVE, NEWINGTON, NH, 03801 · 3.7 mi
COAKLEY LANDFILL 480 BREAKFAST HILL RD, N HAMPTON, NH, 03862 · 4.5 mi

Data centers

LIBERTY MUTUAL DATA CENTER 225 BORTHWICK AVENUE, PORTSMOUTH, NH, 03801 · 0.6 mi
LIBERTY MUTUAL DATA CENTER 225 BORTHWICK AVE, PORTSMOUTH, NH, 03801 · 0.6 mi
Unnamed data center (OSM) 77 Aviation Avenue, Portsmouth · 1.8 mi

County

Rockingham County

Nearby towns

Hampton 8 mi
Durham 9 mi
Dover 10 mi
Somersworth 14 mi
Amesbury, MA 17 mi
Newburyport, MA 18 mi
Rochester 19 mi
Haverhill, MA 25 mi

Reading these numbers

These are regulatory records, not measurements of pollution. Most facilities appear because they hold a permit or file reports, and most of them are compliant; a listing is not a claim that a facility has polluted anything. Compliance status and penalties are the EPA's own determinations in data retrieved Oct 9, 2026. Distances are from the center of Portsmouth as the Census Bureau records it. The Data page explains where each record comes from and how it can mislead.