Merrimack County, NH
The federal environmental record for Merrimack County (population 157,103): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
0
Superfund NPL sites
2
federal cleanup sites
2
PFAS-detecting water systems
13
TRI facilities
73
open tank releases
Drinking water: PFAS testing
Public water systems serving Merrimack with at least one PFAS detection under UCMR5. The federal limit for PFOA and PFOS is 4 ng/L; EPA proposed in May 2026 to rescind the limits for the other compounds, which are shown for information.
| System | Highest results | Reading |
|---|---|---|
| CENTRAL HOOKSETT WATER PCT NH1181010 | PFBA: 28 ng/L PFOA: 4.9 ng/L | above final limit |
| PEMBROKE WATER WORKS NH1861010 | PFOS: 6.5 ng/L PFBS: 5.9 ng/L | above final limit |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
13 facilities in Merrimack filed TRI reports for 2024, totalling 158k lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| WATTS REGULATOR CO DBA WEBSTER VALVE | FRANKLIN | Copper, Lead | 113k lb |
| MERRIMACK STATION | BOW | Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size), Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 34k lb |
| ELEKTRISOLA INC. | BOSCAWEN | N-Methyl-2-pyrrolidone, Copper | 7k lb |
| KALWALL CORP FLAT SHEE T DIV | BOW | Styrene, Methyl methacrylate | 2k lb |
| GE CO | HOOKSETT | Nickel, Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 501 lb |
| LINDE ADVANCED MATERIAL TECHNOLOGIES INC. | CONCORD | Copper | 253 lb |
| PITCO FRIALATOR INC | BOW | Chromium, Nickel | 33 lb |
| PIKE INDUSTRIES INC - NORTHFIELD | NORTHFIELD | Polycyclic aromatic compounds | 3 lb |
| HOOKSETT CRUSHED STONE PIKE INDUSTRIES INC | HOOKSETT | Polycyclic aromatic compounds, Lead | 1 lb |
| BROX INDUSTRIES INC | HOOKSETT | Benzo[g,h,i]perylene | 0 lb |
| HP HOOD LLC | CONCORD | - | 0 lb |
| WHITE MOUNTAIN IMAGING | CONCORD | - | 0 lb |
| HEAT & CONTROL | PEMBROKE | - | 0 lb |
Underground fuel tanks
EPA's UST Finder records 558 tank facilities in Merrimack: 339 tanks in service and 1,600 closed. 279 fuel releases are on record, of which 73 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Merrimack as Zone 2, moderate predicted indoor radon (2 to 4 pCi/L average). Radon and air quality are covered in depth on lung.com.
The record for one specific address
County figures blur what matters: distance. The Address Environmental Report runs these same federal datasets against one address and reports every site, tank, polluter and water result around it, with distances, in about a minute.
Get the report - $39All federal cleanup sites on file
The wider Superfund enterprise inventory (SEMS) for Merrimack, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- ALLIED LEATHERBOSCAWEN
- MERRIMACK RIVER TANNERY WASTEBOSCAWEN