Hillsborough, NH
A PlainEnviro-computed score from reported facility/violation counts, not an official EPA rating, health forecast, or population-adjusted rate. See methodology.
Environmental data for Hillsborough in New Hampshire · Population: 424,732
Hillsborough, NH is tracked across three EPA datasets covering 43 Toxics Release Inventory (TRI) facilities, 149 Safe Drinking Water Act systems, and 0 Superfund National Priorities List sites. Together these generate an environmental burden score of 59/100 (Moderate Risk), calibrated against national distributions for facility density, chemical release volume, Superfund concentration, and water-system health violations.
Industrial disclosures inside the county total 243.2K lbs of reported toxic releases under EPCRA Section 313, while 44 water systems carry an active health-based violation in the SDWIS record. EPA Air Quality System monitors logged a median AQI of 37 and a peak AQI of 97 in 2024, with 90% of observed days rated "Good" (0–50).
All figures below draw directly from federal EPA records, TRI self-reported emissions, SDWIS compliance history, NPL Hazard Ranking System scores, and AQS daily AQI summaries, and are not adjusted, weighted, or forecast. A past violation or elevated score does not itself indicate current unsafe conditions; it documents the regulatory and disclosure history publicly filed with the U.S. Environmental Protection Agency through the most recent reporting cycle.
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 | 328 (90%) | 38 | 0 | 97 |
| 2023 | 305 (84%) | 55 | 5 | 119 |
| 2022 | 329 (90%) | 36 | 0 | 100 |
| 2021 | 328 (90%) | 35 | 2 | 144 |
| 2020 | 351 (96%) | 15 | 0 | 90 |
Source: EPA Air Quality System (AQS) Annual AQI by County 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 New Hampshire, see the EPA's AirNow.gov.
Water Systems (149)
| System | Population | Violations |
|---|---|---|
| MANCHESTER WATER WORKS | 123,500 | 0 |
| PENNICHUCK WATER WORKS | 89,073 | 0 |
| MERRIMACK VILLAGE DIST | 25,500 | 0 |
| HUDSON WATER DEPT | 16,700 | 0 |
| MILFORD WATER UTILITIES DEPT | 9,500 | 0 |
| LITCHFIELD | 7,000 | 0 |
| LONDONDERRY | 5,380 | 0 |
| PETERBOROUGH WATER WORKS | 4,500 | 0 |
| LITTLE POND ESTATES | 3,000 | 0 |
| GOFFSTOWN VILLAGE PCT | 3,000 | 8 |
| LOCKE LAKE | 2,278 | 8 |
| HILLSBOROUGH WATER WORKS | 2,000 | 0 |
| WILTON WATER WORKS | 1,790 | 0 |
| DREW WOODS | 1,408 | 0 |
| EMERALD LAKE | 1,300 | 6 |
| POWDER HILL | 1,155 | 0 |
| GRASMERE WATER PCT/MAIN | 1,125 | 1 |
| GREENVILLE WATER DEPT | 1,100 | 0 |
| WILLIAMSBURG | 928 | 0 |
| ANTRIM SEWER AND WATER DEPT | 920 | 0 |
| CABOT PRESERVE | 878 | 0 |
| BROOK PARK ESTS | 875 | 0 |
| CENTURY VILLAGE CONDOS | 875 | 1 |
| BENNINGTON WATER DEPT | 775 | 0 |
| GREEN HILLS ESTS | 620 | 0 |
| BIRCH HILL EAST | 550 | 0 |
| W AND E | 525 | 0 |
| MAPLE HILL ACRES | 523 | 0 |
| GREENVILLE EST VILLAGE DIST | 472 | 0 |
| WHISPERING WINDS | 460 | 0 |
| HANCOCK WATER WORKS | 450 | 0 |
| BADGER HILL | 438 | 0 |
| AVERY ESTATES | 380 | 0 |
| TWIN RIDGE CONDOS | 348 | 0 |
| SAMOSET AT WINNIPESAUKEE | 343 | 1 |
| GOLDEN BROOK | 323 | 0 |
| OAKWOOD TERRACE | 307 | 0 |
| VILLAGES AT STOW | 300 | 0 |
| CROTCHED MOUNTAIN SCHOOL | 300 | 9 |
| MINISTERIAL/PARRISH HILLS | 298 | 0 |
| SOUHEGAN WOODS | 293 | 0 |
| WEDIKO SCHOOL | 280 | 7 |
| GLEN RIDGE DEV | 253 | 0 |
| MAPLE HAVEN | 250 | 0 |
| VILLAGES AT CHESTER CONDOS | 245 | 0 |
| CONTOOCOOK RIVER COOPERATIVE | 245 | 0 |
| SPRINGWOOD HILLS | 225 | 0 |
| SUNRISE ESTATES | 225 | 2 |
| GREAT BAY WATER SYSTEM | 218 | 0 |
| WESCO UTILITIES | 200 | 1 |
| SOUTH WEARE WATER | 200 | 19 |
| WOODLANDS | 198 | 0 |
| VALLEY FIELD APTS NORTHLAND | 188 | 0 |
| LIBERTY TREE ACRES | 183 | 0 |
| MOUNTAINSIDE AT CROTCHED MTN | 180 | 1 |
| AUTUMN WOODS | 180 | 0 |
| FOREST VIEW ESTATES | 180 | 0 |
| COLLINS LANDING | 180 | 0 |
| HARVEST VILLAGE | 175 | 0 |
| SMYTHE WOODS | 165 | 0 |
| CLEARWATER ESTATES | 163 | 0 |
| LAMPLIGHTER VILLAGE | 162 | 0 |
| SKY VIEW ESTATES | 158 | 0 |
| SEASONS AT LAKE SUNAPEE | 153 | 0 |
| HI AND LO ESTATES | 143 | 0 |
| BROOKSIDE CROSSING | 138 | 1 |
| MEADOWBROOK ACRES MOBILE HOME PARK | 137 | 0 |
| FLETCHER CORNER ESTATES | 133 | 0 |
| FOREST RIDGE | 130 | 1 |
| FRANCESTOWN VILLAGE WATER | 130 | 0 |
| OLDE COUNTRY VILLAGE | 130 | 2 |
| BROADVIEW CONDOS | 128 | 0 |
| HIGHLAND ESTATES APARTMENTS | 120 | 0 |
| SPRUCE POND ESTS | 118 | 0 |
| RIDGEWOOD ESTATES | 115 | 0 |
| MT LAUREL ESTATES | 115 | 2 |
| PACKER MEADOWS | 115 | 1 |
| GARLAND WOODS | 115 | 0 |
| CASTLE REACH | 115 | 6 |
| BRIAR COURT ESTATES | 113 | 0 |
| WHITE ROCK SENIOR LIVING | 110 | 0 |
| GOLDEN HILL | 110 | 4 |
| CASTLETON MEADOWS | 107 | 0 |
| STONE SLED FARM | 105 | 0 |
| ORCHARD HIGHLANDS | 105 | 0 |
| HANAFIN FARM | 105 | 0 |
| LANDMARK ESTATES CONDOS | 105 | 18 |
| FREEDOM POND | 104 | 1 |
| SILVER LAKE ESTATES | 100 | 6 |
| HIGHLANDS VILLAGE DISTRICT | 100 | 0 |
| ASHUELOT RIVER APTS | 100 | 1 |
| HARDWOOD HTS BIRCH HILL | 100 | 0 |
| COMMONS OF ATKINSON | 95 | 0 |
| VALLEY CARES INC | 92 | 0 |
| FARMSTEAD ACRES | 90 | 0 |
| GRASMERE WP/LANDMARK | 90 | 0 |
| PINEHAVEN WATER TRUST | 88 | 0 |
| NORTHERN SHORES | 88 | 0 |
| THURSTON WOODS | 85 | 0 |
| WINHALL ACRES | 84 | 3 |
| SHAKER HEIGHTS | 83 | 0 |
| EVERGREEN DRIVE WATER | 80 | 2 |
| SUGAR HILL MANOR MHP | 76 | 3 |
| FARLEY RD ESTATES | 75 | 1 |
| SWEET HILL ESTATES | 75 | 2 |
| KUNCANOWET HILLS MOBILE HOME | 75 | 1 |
| ASHLEY COMMONS | 73 | 0 |
| GAGE HILL | 70 | 0 |
| KILNWOOD ON KANASATKA | 68 | 0 |
| DANIELS LAKE | 68 | 1 |
| BLACK RIVER OVERLOOK | 66 | 1 |
| HILLCREST MANOR APTS | 65 | 1 |
| SOUTH FACE CONDOS | 60 | 0 |
| STONEBRIDGE VILLAGE | 60 | 0 |
| REMICK ACRES | 60 | 0 |
| FRANCOEUR APT/HUDSON MOTOR INN | 58 | 0 |
| LOUISBURG CIRCLE | 55 | 0 |
| BRYANT BROOK | 55 | 0 |
| GOWING WOODS | 53 | 0 |
| BIRCHES OF BENNINGTON | 52 | 1 |
| KINGSTON PINES ELDERLY HOUSING | 52 | 0 |
| STONEARCH CONDO ASSN/KIRKWALL | 52 | 0 |
| CONNOR COURT | 51 | 0 |
| STRAWBERRY HILL | 50 | 0 |
| HUCKLE HILL HOUSING | 49 | 0 |
| ENGLISH WOODS | 48 | 0 |
| GREENFIELD COMMONS | 48 | 3 |
| HERITAGE WAY | 48 | 0 |
| WHIP O WILL CONDOS | 45 | 0 |
| HEDGEHOG COMMUNITY COOP | 45 | 0 |
| PARADISE ESTATES CONDOMINIUM | 45 | 0 |
| CARRIAGE APTS | 43 | 1 |
| STONEGATE ESTATES | 42 | 0 |
| FOXGLOVE APARTMENTS | 40 | 1 |
| BRIARWOOD TOWNHOMES | 40 | 0 |
| BOULDER HILLS | 39 | 1 |
| SUN LAKE VILLAGE | 38 | 0 |
| THE PLACE IN OSSIPEE | 38 | 0 |
| HOLLIS VILLAGE MARKETPLACE | 36 | 13 |
| 20 JAFFREY RD | 32 | 2 |
| THE MEADOW AT NORTHWOOD | 31 | 0 |
| FLINTLOCK APTS | 30 | 2 |
| MADBURY WOODS APARTMENTS | 30 | 5 |
| BEAVER HOLLOW | 30 | 0 |
| CORNERSTONE PLACE | 25 | 5 |
| SHERBURN WOODS | 25 | 0 |
| ROCKWOOD TERRACE CONDOS | 25 | 4 |
| MCAULEY COMMONS | 25 | 0 |
| PAPERMILL VILLAGE | 24 | 1 |
TRI Facilities (43)
Cities in Hillsborough (10)
Frequently Asked Questions
What is the environmental risk level in Hillsborough, New Hampshire? ▼
Are there Superfund sites in Hillsborough? ▼
How many toxic release facilities are in Hillsborough? ▼
What is the air quality in Hillsborough? ▼
Is the drinking water safe in Hillsborough? ▼
What environmental agencies cover Hillsborough? ▼
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.