New Hampshire Drinking Water Compliance Records
706 water systems serving 922,702 people. 7,556 historical EPA violation records in the Q2 2026 snapshot.
TapScore Compliance-History Grades
A
511
72%
B
105
15%
C
60
8%
D
27
4%
F
3
0%
706
Water Systems
922,702
Population Served
7,556
Historical Records
543
Health-Based (All Years)
Systems With the Most Recent EPA Records
FLINTLOCK APTS
30 served61 historical records37 recent
C
NEW HAMPTON VILLAGE PCT
600 served49 historical records31 recent
F
MOUNTAIN VALE VILLAGE MHP
388 served26 historical records22 recent
C
COPPLE CROWN VILLAGE DISTRICT
80 served46 historical records20 recent
D
GREEN VALLEY MOBILE HOME PARK
127 served20 historical records18 recent
C
BRAKE HILL ACRES
98 served25 historical records18 recent
C
NORTH CONWAY WATER PCT
5,500 served22 historical records18 recent
C
ANDOVER VILLAGE DIST
650 served58 historical records17 recent
F
CROTCHED MOUNTAIN SCHOOL
300 served50 historical records13 recent
D
ROLLING RIDGE
58 served38 historical records13 recent
F
Large Systems With No Recent Records
MANCHESTER WATER WORKS
123,500 served0 historical records
A
PENNICHUCK WATER WORKS
88,853 served0 historical records
A
CONCORD WATER DEPT
44,215 served0 historical records
A
PORTSMOUTH WATER WORKS
33,000 served0 historical records
A
KEENE WATER DEPT
30,000 served1 historical record
A
DOVER WATER DEPT
29,000 served16 historical records
A
MERRIMACK VILLAGE DIST
25,500 served20 historical records
A
ROCHESTER WATER DEPT
25,000 served2 historical records
A
SALEM WATER DEPT
21,000 served1 historical record
A
DERRY WATER DEPT
17,370 served0 historical records
A
Largest Water Systems in New Hampshire
| Water System | Grade | Population | Historical Records |
|---|---|---|---|
| MANCHESTER WATER WORKS | A | 123,500 | 0 |
| PENNICHUCK WATER WORKS | A | 88,853 | 0 |
| CONCORD WATER DEPT | A | 44,215 | 0 |
| AQUARION WATER/NH | B | 34,000 | 1 |
| PORTSMOUTH WATER WORKS | A | 33,000 | 0 |
| KEENE WATER DEPT | A | 30,000 | 1 |
| DOVER WATER DEPT | A | 29,000 | 16 |
| MERRIMACK VILLAGE DIST | A | 25,500 | 20 |
| ROCHESTER WATER DEPT | A | 25,000 | 2 |
| SALEM WATER DEPT | A | 21,000 | 1 |
| DERRY WATER DEPT | A | 17,370 | 0 |
| LACONIA WATER WORKS | A | 17,125 | 0 |
| HUDSON WATER DEPT | B | 16,700 | 2 |
| UNH/DURHAM WATER SYS | A | 16,000 | 1 |
| SEABROOK WATER DEPT | B | 14,000 | 143 |
| LEBANON WATER DEPT | C | 13,600 | 2 |
| EXETER WATER DEPT | A | 12,236 | 11 |
| SOMERSWORTH WATER WORKS | A | 12,200 | 2 |
| PEASE TRADE PORT | A | 9,900 | 1 |
| HANOVER WATER DEPT | A | 9,600 | 16 |
Contaminants in New Hampshire
Lead in New HampshireArsenic in New HampshireNitrate in New HampshireFluoride in New HampshirePFOS in New HampshirePFOA in New HampshireTHMs in New HampshireHAA5 in New Hampshire
Cities in New Hampshire
NASHUA(69)MANCHESTER(19)CONCORD(13)PORTSMOUTH(11)MONROE(8)HAMPTON(11)KEENE(2)DOVER(4)ROCHESTER(10)MERRIMACK(3)SALEM(9)DERRY(22)LACONIA(9)HUDSON(5)DURHAM(4)EXETER(21)SEABROOK(2)LEBANON(6)SOMERSWORTH(2)CONWAY(26)ATKINSON(32)MILFORD(7)LONDONDERRY(18)HANOVER(1)BERLIN(1)CLAREMONT(1)HOOKSETT(5)BARTLETT(24)FRANKLIN(7)PLYMOUTH(6)HAMPSTEAD(3)LITCHFIELD(1)NORTH CONWAY(6)LITTLETON(1)WOLFEBORO(6)MOULTONBOROUGH(30)BEDFORD(19)NEWMARKET(5)GILFORD(33)PEMBROKE(3)RAYMOND(11)NEWPORT(2)GOFFSTOWN(6)MEREDITH(11)PETERBOROUGH(1)INTERVALE(9)HAVERHILL(6)RYE(1)BELMONT(17)JAFFREY(2)BOSCAWEN(1)TILTON(10)NEW LONDON(3)BRISTOL(1)WOODSVILLE(3)GRANTHAM(2)HINSDALE(2)HILLSBOROUGH(2)LINCOLN(1)FARMINGTON(1)WATERVILLE VALLEY(1)ALTON(6)CHARLESTOWN(4)HENNIKER(3)SWANZEY(7)CAMPTON(13)WINCHESTER(3)WINDHAM(20)WOODSTOCK(2)NORTH WOODSTOCK(1)NORTHFIELD(5)GROVETON(2)NORTHUMBERLAND(2)GORHAM(2)LANCASTER(1)WAKEFIELD(5)OSSIPEE(10)EPPING(9)BARNSTEAD(1)STRATHAM(21)HOPKINTON(5)SUNAPEE(3)PLAISTOW(20)ENFIELD(8)ASHLAND(3)GLEN(11)WALPOLE(5)PELHAM(13)CARROLL(2)EPSOM(10)WILTON(1)BETHLEHEM(1)N SWANZEY(1)PITTSFIELD(2)ROLLINSFORD(1)GREENVILLE(3)NORTHWOOD(12)WHITEFIELD(1)BARRINGTON(15)BRENTWOOD(3)