County · New Hampshire
Merrimack County, New Hampshire: drinking water records
This overview covers 28 ZIP codes and 61 community water systems in Merrimack County. It also stands in for 10 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Concord Water Dept NH0501010 | 44,215 | 120 | 0 | 0 | 1 ppb |
| Franklin Water Works NH0851010 | 7,200 | 240 | 0 | 0 | 3 ppb |
| Pembroke Water Works NH1861010 | 5,200 | 240 | 2 | 0 | 0 ppb |
| Central Hooksett Water Pct NH1181010 | 4,650 | 120 | 2 | 0 | 1 ppb |
| Penacook Boscawen Water Pct NH0251010 | 3,800 | 180 | 0 | 0 | 0 ppb |
| New London Springfield Water NH1721010 | 3,250 | 60 | 0 | 0 | 30 ppb |
| Contoocook Village Pct NH1191010 | 1,600 | 0 | 0 | 24 | 37 ppb |
| Andover Village Dist NH0081010 | 650 | 0 | 0 | 7 | 56 ppb |
| Epsom Healthcare Ctr NH0774010 | 240 | 0 | 0 | 9 | 27 ppb |
| Hopkinton Village Pct NH1191020 | 215 | 0 | 0 | 2 | 280 ppb |
| Liberty Ridge MHP NH1123020 | 91 | 0 | 0 | 1 | 23 ppb |
| Elm Brook Village NH1193020 | 90 | 0 | 0 | 5 | 21 ppb |
| Soda Brook NH1763010 | 64 | 0 | 0 | 1 | 53 ppb |
| Robinsons Mhp/Upper NH0453020 | 55 | 0 | 0 | 1 | 16 ppb |
| Cogswell Springs Water Works NH1121010 | 3,000 | 0 | 0 | 0 | 19 ppb |
| Tilton Northfield Water Dist NH2351010 | 2,500 | 0 | 0 | 0 | 36 ppb |
| Pittsfield Aqueduct NH1911010 | 1,625 | 0 | 0 | 0 | 70 ppb |
| Bear View Crossing NH0043050 | 800 | 0 | 0 | 0 | 60 ppb |
| Epsom Village Water District NH0771010 | 800 | 0 | 0 | 0 | 23 ppb |
| Warner Village Water Dist NH2411010 | 660 | 0 | 0 | 0 | 16 ppb |
| Hill Water Works NH1131010 | 600 | 0 | 0 | 0 | 19 ppb |
| Catamount Hill NH0043040 | 383 | 0 | 0 | 3 | not reported |
| Freedom Hill/Pine Ridge Est NH1403030 | 370 | 0 | 0 | 8 | not reported |
| Pleasant Pond Coop and Cmpgrnd NH2413010 | 218 | 0 | 0 | 1 | not reported |
| Chalk Pond Water NH1652020 | 208 | 0 | 0 | 0 | 22 ppb |
ZIP reports in Merrimack County
No ZIP report in this county is published yet.
These ZIP codes are covered by this overview because their utility has too little EPA data for a separate page: 03046, 03224, 03230, 03231, 03233, 03260, 03268, 03273, 03287, 03304.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.