TRI air releases
TRI air releases at New Hampshire have more than three-quarters since 2010 (through 2024).
State · TRI 2024
New Hampshire Pollution
93 TRI facilities, 677 public water systems, and 22 Superfund / NPL sites across 10 counties. Statewide TRI releases held roughly steady year over year (+2%). Toxic releases concentrations have more than halved since 2010.
FIPS 33 · population 1,377,529 · 10 counties total
Anomaly engine
Notable Signals At The State Level
Total TRI releases
Total TRI releases at New Hampshire have more than three-quarters since 2010 (through 2024).
Where the burden sits
County-Level TRI Choropleth
A color-shaded map of pollution data. Darker counties report more pounds of toxic chemicals released to the EPA's Toxics Release Inventory (TRI).
Shaded by total reported releases for 2024. Counties without a published page render as “no TRI data”. Red dots mark this state's top emitters.
Statewide pollutant pathways
New Hampshire Pollutant Multi-Year Trends
PM2.5 annual mean (NAAQS 9 µg/m³ (annual))Health riskFine inhalable particles 2.5 micrometers or smaller. They travel deep into the lungs and into the bloodstream — linked to asthma, heart disease, stroke, and premature death.
PM2.5 annual mean (NAAQS 9 µg/m³ (annual)) concentrations have more than halved since 2010.
PM2.5 24-hour 98th percentile (NAAQS 35 µg/m³ (24-hour))Health riskFine inhalable particles 2.5 micrometers or smaller. They travel deep into the lungs and into the bloodstream — linked to asthma, heart disease, stroke, and premature death.
PM2.5 24-hour 98th percentile (NAAQS 35 µg/m³ (24-hour)) concentrations have fallen 46% since 2010.
Ozone 8-hour 4th-highest daily max (NAAQS 0.070 ppm (8-hour))Health riskGround-level ozone (smog) forms when vehicle and industrial emissions react in sunlight. Inflames the airways, triggers asthma attacks, and worsens heart and lung disease.
Ozone 8-hour 4th-highest daily max (NAAQS 0.070 ppm (8-hour)) concentrations are roughly unchanged from 2010.
NO₂ annual mean (NAAQS 53 ppb (annual))Health riskA tailpipe and combustion gas. Concentrates near busy roads and industrial sites; raises risk of airway inflammation, asthma, and lower respiratory infections in children.
NO₂ annual mean (NAAQS 53 ppb (annual)) concentrations have more than halved since 2010.
Lifetime cancer risk all pollutants (100 in a million (EPA elevated threshold))Health riskEPA-modeled added cancer cases per million residents from a lifetime of breathing local air toxics. EPA flags 100-in-a-million as elevated.
Single-vintage exposure modeling — EPA cadence is multi-year, so no trend line yet.
Formaldehyde ambient mean (0.077 µg/m³ (1-in-a-million URE))Health riskAn air toxic emitted by refineries, wood products, and combustion. EPA classifies it as a known human carcinogen — long-term inhalation raises cancer risk.
Single-vintage exposure modeling — EPA cadence is multi-year, so no trend line yet.
Benzene ambient mean (0.13 µg/m³ (1-in-a-million URE))Health riskAn air toxic from gasoline, refineries, and tobacco smoke. A known human carcinogen — chronic exposure is linked to leukemia and other blood cancers.
Single-vintage exposure modeling — EPA cadence is multi-year, so no trend line yet.
TRI air releases (5.1 fugitive + 5.2 stack)Health riskToxic chemicals reported by industrial facilities as released into the air — fugitive leaks plus smokestack emissions. Higher pounds means more inhaled exposure for nearby residents.
TRI air releases (5.1 fugitive + 5.2 stack) concentrations have more than halved since 2010.
TRI water releases (5.3)Health riskToxic chemicals reported by industrial facilities as discharged to surface waters (rivers, lakes, the ocean). Affects fishing, recreation, and downstream drinking-water intakes.
TRI water releases (5.3) volumes here are too small to anchor a multi-year trend; YoY movement is still shown above.
TRI land + off-site releasesHealth riskToxic chemicals released to land on-site or transferred off-site for disposal — landfills, deep-well injection, and similar. Risks groundwater contamination over time.
TRI land + off-site releases concentrations are up 22% since 2010.
Greenhouse gases (GHGRP large emitters, through 2023)Health riskGreenhouse gases reported by large industrial emitters under EPA's GHGRP, in metric tons of CO₂ equivalent. Drives climate warming and the heat-related health effects that follow.
Greenhouse gases (GHGRP large emitters, through 2023) concentrations have more than halved since 2010.
| County | Population | Facilities | Total releases | YoY | Top chemical |
|---|---|---|---|---|---|
| Merrimack CountyFIPS 33013 | 153,918 | 10 | 158k lb | +12% | CopperHealth riskInhaled copper fumes cause metal-fume fever; chronic ingestion above EPA's 1.3 mg/L action level damages the liver. (EPA) |
| Grafton CountyFIPS 33009 | 90,836 | 14 | 109k lb | +5% | Nitrate compounds (water dissociable; reportable only when in aqueous solution)Health riskDrinking-water nitrate causes methemoglobinemia ('blue-baby syndrome') in infants; EPA MCL is 10 mg/L as N. (EPA) |
| Hillsborough CountyFIPS 33011 | 422,733 | 27 | 52k lb | -17% | N-Methyl-2-pyrrolidoneHealth riskReproductive and developmental toxicant; absorbed through skin. (EPA) |
| Rockingham CountyFIPS 33015 | 315,169 | 23 | 45k lb | -3% | Methyl methacrylateHealth riskSkin and respiratory sensitizer; can trigger occupational asthma and dermatitis. (OSHA) |
| Strafford CountyFIPS 33017 | 130,965 | 9 | 13k lb | -30% | StyreneHealth riskIARC Group 2A probable carcinogen; central-nervous-system effects from inhalation. (IARC, EPA) |
| Sullivan CountyFIPS 33019 | 43,356 | 3 | 12k lb | -0% | NickelHealth riskNickel compounds are IARC Group 1 carcinogens; inhalation exposure raises lung and nasal cancer risk. (IARC) |
| Cheshire CountyFIPS 33005 | 76,610 | 2 | 11k lb | +17% | StyreneHealth riskIARC Group 2A probable carcinogen; central-nervous-system effects from inhalation. (IARC, EPA) |
| Carroll CountyFIPS 33003 | 50,679 | 1 | 2k lb | 0% | Antimony compoundsHealth riskInhaled antimony trioxide is an IARC Group 2B possible carcinogen; respiratory and cardiovascular effects from long-term exposure. EPA MCL 6 µg/L. (IARC, EPA) |
| Belknap CountyFIPS 33001 | 63,914 | 3 | 1k lb | +16% | DiisocyanatesHealth riskLeading cause of occupational asthma; severe respiratory sensitizers. (OSHA) |
| Coos CountyFIPS 33007 | 31,430 | 1 | 864 lb | +17% | LeadHealth riskNeurotoxin. Even low childhood exposure impairs cognitive development; chronic adult exposure damages kidneys and the cardiovascular system. (EPA, ATSDR) |
| Facility | City | Top chemical | Total releases | YoY |
|---|---|---|---|---|
| Watts Regulator CO Dba Webster ValveWatts Water Technologies | Franklin | CopperHealth riskInhaled copper fumes cause metal-fume fever; chronic ingestion above EPA's 1.3 mg/L action level damages the liver. (EPA) | 113k lb | +14% |
| Burndy LLCHubbell INC | Lincoln | Nitrate compounds (water dissociable; reportable only when in aqueous solution)Health riskDrinking-water nitrate causes methemoglobinemia ('blue-baby syndrome') in infants; EPA MCL is 10 mg/L as N. (EPA) | 88k lb | +12% |
| Merrimack StationGranite Shore Power LLC | Bow | Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)Health riskAcid mists are an IARC Group 1 carcinogen via inhalation (laryngeal cancer) and corrosive on contact. (IARC) | 34k lb | +11% |
| Henkel Of America INC.Henkel Of America INC | Seabrook | Methyl methacrylateHealth riskSkin and respiratory sensitizer; can trigger occupational asthma and dermatitis. (OSHA) | 22k lb | -1% |
| Vibracoustic Na LPVibracoustic USA INC | Manchester | N-Methyl-2-pyrrolidoneHealth riskReproductive and developmental toxicant; absorbed through skin. (EPA) | 13k lb | -7% |
| Essential Power NewingtonNautilus Power LLC | Newington | AmmoniaHealth riskSevere respiratory and eye irritant; high concentrations cause chemical burns to lung tissue. (EPA) | 12k lb | +6% |
| Sturm Ruger & CO. INC.Sturm Ruger & Co INC | Newport | NickelHealth riskNickel compounds are IARC Group 1 carcinogens; inhalation exposure raises lung and nasal cancer risk. (IARC) | 12k lb | 0% |
| Hitchiner Countergravity Cast Operations (Vco/Dco/Mct)Hitchiner Manufacturing Co INC | Milford | NickelHealth riskNickel compounds are IARC Group 1 carcinogens; inhalation exposure raises lung and nasal cancer risk. (IARC) | 11k lb | +9% |
| Worthen IndustriesWf Holdings INC | Nashua | TolueneHealth riskCentral-nervous-system depressant. Chronic high exposure causes hearing loss and developmental effects. (EPA, ATSDR) | 8k lb | -25% |
| Freudenberg-Nok Sealing TechnologiesFreudenberg-Nok General Ptnr | Bristol | MethanolHealth riskAcutely toxic if ingested or inhaled. Metabolizes to formaldehyde and formic acid, causing blindness and metabolic acidosis. (EPA) | 8k lb | -13% |
Water utilities to watch
Largest Water Systems With Unresolved Health-Based Violations
Sorted to surface utilities serving the most people that still have an active health-based SDWIS violation on the record. Systems in compliance with no unresolved issues fall to the bottom of the ranking.
| Water system | PWSID | Population served | Health-based · 5yr | Status |
|---|---|---|---|---|
| Lebanon Water Dept Municipal | NH1321010 | 13,600 | 4 | UNRESOLVED |
| Exeter Water Dept Municipal | NH0801010 | 12,236 | 1 | UNRESOLVED |
| Hampstead Area Water Private | NH1031010 | 7,153 | 4 | UNRESOLVED |
| Rye Water Dist Municipal | NH2041010 | 4,300 | 2 | UNRESOLVED |
| Meredith Water Dept Municipal | NH1521010 | 3,750 | 11 | UNRESOLVED |
| Goffstown Village Pct Municipal | NH0911010 | 3,250 | 10 | UNRESOLVED |
| Paradise Shores Private | NH1612010 | 2,060 | 5 | UNRESOLVED |
| Bethlehem Village Dist Municipal | NH0241010 | 1,750 | 14 | UNRESOLVED |
| Rollinsford Water Sewer Dist Municipal | NH2011010 | 1,688 | 3 | UNRESOLVED |
| Contoocook Village Pct Municipal | NH1191010 | 1,600 | 34 | UNRESOLVED |
Superfund / NPL sites
Federal Cleanup Sites In New Hampshire
Sites on EPA's Superfund National Priorities List, plus deleted sites whose cleanup objectives EPA has finalized. Federal-facility sites (defense, DOE, etc.) are flagged separately. Each link routes to a per-site page.
| Site | City | Status | Federal facility | Primary contaminant |
|---|---|---|---|---|
| Auburn Road Landfill | Londonderry | NPL FINAL | No | ArsenicHealth riskIARC Group 1 carcinogen via inhalation and ingestion. EPA MCL 10 µg/L; chronic exposure causes skin, lung, bladder cancer and cardiovascular disease. (IARC, EPA, ATSDR) |
| Beede Waste Oil | Plaistow | NPL FINAL | No | 1,1,1-TrichloroethaneHealth riskMethyl chloroform. CNS depressant; ozone-depleting substance phased out under Montreal Protocol. EPA MCL 200 µg/L. (EPA, ATSDR) |
| Chlor-Alkali Facility (Former) | Berlin | NPL FINAL | No | 1,3-DichlorobenzeneHealth riskLimited human-health data; treated as a probable hepatotoxin. (EPA) |
| Coakley Landfill | North Hampton | NPL FINAL | No | ArsenicHealth riskIARC Group 1 carcinogen via inhalation and ingestion. EPA MCL 10 µg/L; chronic exposure causes skin, lung, bladder cancer and cardiovascular disease. (IARC, EPA, ATSDR) |
| Collins & Aikman Plant (Former) | Farmington | NPL FINAL | No | — |
| Dover Municipal Landfill | Dover | NPL FINAL | No | Tetrahydrofuran |
| Fletcher'S Paint Works & Storage | Milford | NPL FINAL | No | ArsenicHealth riskIARC Group 1 carcinogen via inhalation and ingestion. EPA MCL 10 µg/L; chronic exposure causes skin, lung, bladder cancer and cardiovascular disease. (IARC, EPA, ATSDR) |
| Kearsarge Metallurgical Corp. | Conway | NPL FINAL | No | 1,1,1-TrichloroethaneHealth riskMethyl chloroform. CNS depressant; ozone-depleting substance phased out under Montreal Protocol. EPA MCL 200 µg/L. (EPA, ATSDR) |
| Keefe Environmental Services (Kes) | Epping | NPL FINAL | No | TetrachloroetheneHealth riskPCE / 'perc'. IARC Group 2A probable carcinogen; central-nervous-system effects; common dry-cleaning solvent and DNAPL plume contaminant. EPA MCL 5 µg/L. (IARC, EPA) |
| Mottolo Pig Farm | Raymond | NPL FINAL | No | ArsenicHealth riskIARC Group 1 carcinogen via inhalation and ingestion. EPA MCL 10 µg/L; chronic exposure causes skin, lung, bladder cancer and cardiovascular disease. (IARC, EPA, ATSDR) |
Showing the top 10 sites by status priority. 12 additional NPL-relevant sites in New Hampshire have entity pages — browse them via the host-county or host-city page rollups.
Equity context · ACS 2018-2022 · USEPA-clone EJ disparity
Statewide Population Characteristics
All New Hampshire block groups: 1,377,529 residents. Statewide disparity score for pm2.5 (fine particulate) sits well below the reference (2). Why we surface this →
State-level percentiles are aggregated from block-group EJScreen data. The EJ pattern within the state will be sharper at the county level — drill down for the meaningful spatial detail.
7.3%
Low-income
11.7%
People of color
5.0%
Under age 5
19.0%
Over age 64
- PM2.5 (fine particulate)Health riskFine inhalable particles 2.5 micrometers or smaller. They travel deep into the lungs and into the bloodstream — linked to asthma, heart disease, stroke, and premature death.2below the national median
- OzoneHealth riskGround-level ozone (smog) inflames the airways. Even short exposures trigger asthma attacks and worsen chronic lung and heart disease.13below the national median
- Nitrogen dioxide (NO₂)Health riskA tailpipe and combustion gas. Concentrates near busy roads and industrial sites; raises risk of airway inflammation, asthma, and lower respiratory infections in children.26below the national median
- Diesel particulateHealth riskSoot from diesel engines (trucks, trains, ports, construction). EPA classifies it as a likely human carcinogen and a major driver of childhood asthma near freight corridors.19below the national median
- Toxic releases (RSEI)Health riskEPA's Risk-Screening Environmental Indicators score — weights TRI chemical releases by toxicity, where they go, and how many people are nearby. Higher means greater modeled cancer and chronic-health risk.37below the national median
- Traffic proximityHealth riskPopulation-weighted distance to high-volume roads. Living close to heavy traffic raises exposure to PM2.5, NO₂, and diesel exhaust — and the cardiovascular and asthma risks that follow.42near the national median
- Lead-paint risk (pre-1960 housing)Health riskShare of housing built before 1960, when lead-based paint was common. Dust from deteriorating paint is the leading cause of childhood lead poisoning, which permanently impairs cognitive development.64above the national median
- Superfund site proximityHealth riskPopulation-weighted distance to NPL Superfund sites — the most contaminated waste sites in the country. Nearby groundwater, soil, and air can carry industrial solvents, metals, and other long-lived contaminants.77above the national median
- RMP-facility proximityHealth riskDistance to facilities holding chemicals at quantities large enough to require an EPA Risk Management Plan (refineries, fertilizer plants, etc.). These pose acute exposure risk during accidental releases.44near the national median
- Hazardous-waste site proximityHealth riskDistance to RCRA hazardous-waste handlers (treatment, storage, disposal facilities). Indicates potential exposure to industrial chemicals in air, soil, and groundwater.55near the national median
- Underground storage tanksHealth riskDensity of underground tanks (gasoline, heating oil, industrial fluids). Leaking tanks are a leading source of benzene and other volatile organic compounds in groundwater drinking-water supplies.75above the national median
- NPDES wastewater proximityHealth riskDistance to permitted industrial wastewater dischargers. Closer proximity raises exposure to pollutants released into surface waters used for fishing, recreation, and downstream drinking-water intakes.71above the national median
- Drinking-water non-complianceHealth riskEPA score for public water systems with health-based Safe Drinking Water Act violations. Higher means more residents on systems that recently exceeded safe limits for contaminants like lead, arsenic, or nitrate.79above the national median
| Indicator | Disparity score | Reading |
|---|---|---|
| PM2.5 (fine particulate) | 2 | well below the reference |
| Ozone | 14 | well below the reference |
| Nitrogen dioxide (NO₂) | 21 | well below the reference |
| Diesel particulate | 15 | well below the reference |
| Toxic releases (RSEI) | 18 | well below the reference |
| Traffic proximity | 24 | well below the reference |
| Lead-paint risk (pre-1960 housing) | 36 | well below the reference |
| Superfund site proximity | 27 | well below the reference |
| RMP-facility proximity | 18 | well below the reference |
| Hazardous-waste site proximity | 30 | well below the reference |
| Underground storage tanks | 36 | well below the reference |
| NPDES wastewater proximity | 23 | well below the reference |
| Drinking-water non-compliance | 6 | well below the reference |
Source: Census ACS 2018-2022 (5-year) + USEPA-clone EJ blockgroup stats (raw indicators + EJ disparity mirror). EJ disparity scores via the USEPA-clone GitHub mirror after EPA deprecated the public EJScreen tool in 2025; demographics from Census ACS.
Browse
All 10 New Hampshire Counties With TRI Data
Pollution trends and TRI 2024 pages for every tracked county. Alphabetical.
- Belknap County pollution· 3 facilities
- Carroll County pollution· 1 facility
- Cheshire County pollution· 2 facilities
- Coos County pollution· 1 facility
- Grafton County pollution· 14 facilities
- Hillsborough County pollution· 27 facilities
- Merrimack County pollution· 10 facilities
- Rockingham County pollution· 23 facilities
- Strafford County pollution· 9 facilities
- Sullivan County pollution· 3 facilities
Sources.
- EPA Toxics Release Inventory · retrieved 2026-05-07.