Delaware Drinking Water Compliance Records
289 water systems serving 1,077,820 people. 2,375 historical EPA violation records in the Q2 2026 snapshot.
TapScore Compliance-History Grades
A
277
96%
B
5
2%
C
4
1%
D
2
1%
F
1
0%
289
Water Systems
1,077,820
Population Served
2,375
Historical Records
96
Health-Based (All Years)
Systems With the Most Recent EPA Records
MAKAH NEAH BAY
1,300 served108 historical records50 recent
D
METLAKATLA
1,575 served77 historical records16 recent
F
FORT HALL
2,850 served31 historical records7 recent
C
BIA NORTH IDAHO
490 served73 historical records5 recent
C
CTUIR PWD MISSION
1,310 served62 historical records5 recent
C
WHITE SWAN
900 served27 historical records3 recent
D
WARM SPRINGS WATER TREATMENT PLANT
3,800 served17 historical records1 recent
B
SIDWALTER
130 served10 historical records1 recent
B
HOH TRIBE
120 served87 historical records1 recent
B
LUMMI TRIBAL WATER DISTRICT
3,699 served33 historical records1 recent
B
Large Systems With No Recent Records
ARTESIAN WATER COMPANY
231,114 served2 historical records
A
WILMINGTON WATER DEPARTMENT
107,976 served6 historical records
A
VEOLIA WATER DELAWARE, INC
100,495 served3 historical records
A
REHOBOTH PUMP DISTRICT (TUI)
81,417 served1 historical record
A
BETHANY BAY PUMP DISTRICT
51,000 served1 historical record
A
NEWARK WATER DEPARTMENT
40,000 served11 historical records
A
DOVER WATER DEPARTMENT
39,491 served1 historical record
A
DEWEY BEACH WATER DEPARTMENT
31,000 served0 historical records
A
REHOBOTH BEACH WATER DEPARTMENT
25,000 served0 historical records
A
ARTESIAN SOUTHERN SUSSEX REGIONAL
18,215 served1 historical record
A
Largest Water Systems in Delaware
| Water System | Grade | Population | Historical Records |
|---|---|---|---|
| ARTESIAN WATER COMPANY | A | 231,114 | 2 |
| WILMINGTON WATER DEPARTMENT | A | 107,976 | 6 |
| VEOLIA WATER DELAWARE, INC | A | 100,495 | 3 |
| REHOBOTH PUMP DISTRICT (TUI) | A | 81,417 | 1 |
| BETHANY BAY PUMP DISTRICT | A | 51,000 | 1 |
| NEWARK WATER DEPARTMENT | A | 40,000 | 11 |
| DOVER WATER DEPARTMENT | A | 39,491 | 1 |
| DEWEY BEACH WATER DEPARTMENT | A | 31,000 | 0 |
| REHOBOTH BEACH WATER DEPARTMENT | A | 25,000 | 0 |
| ARTESIAN SOUTHERN SUSSEX REGIONAL | A | 18,215 | 1 |
| MIDDLETOWN WATER DEPARTMENT | A | 17,700 | 1 |
| CAMDEN PUMP DISTRICT | A | 17,208 | 0 |
| GARRISON LAKE PUMP DISTRICT | A | 17,148 | 1 |
| SUSSEX SHORES WATER COMPANY | A | 12,450 | 2 |
| BETHANY BEACH WATER DEPARTMENT | A | 12,000 | 2 |
| SMYRNA WATER DEPARTMENT | A | 11,813 | 0 |
| DOVER AIR FORCE BASE | A | 11,000 | 1 |
| LONG NECK WATER COMPANY | A | 11,000 | 1 |
| MILFORD WATER DEPARTMENT | A | 9,800 | 1 |
| CHURCH CREEK (AWC) | A | 9,654 | 1 |
Contaminants in Delaware
Lead in DelawareArsenic in DelawareNitrate in DelawareFluoride in DelawarePFOS in DelawarePFOA in DelawareTHMs in DelawareHAA5 in Delaware
Cities in Delaware
BEAR(11)HOCKESSIN(2)WILMINGTON(2)REHOBOTH BEACH(11)NEW CASTLE(5)MILLVILLE(2)BETHANY BEACH(3)DOVER(13)NEWARK(2)SMYRNA(11)FRANKFORD(5)DEWEY BEACH(2)MIDDLETOWN(10)CAMDEN-WYOMING(7)MILLSBORO(14)LEWES(9)MILFORD(4)FENWICK ISLAND(4)LONG NECK(2)MAGNOLIA(6)SEAFORD(14)DOVER AFB(1)GEORGETOWN(11)MARYSVILLE(5)BRIDGEVILLE(4)CLAYTON(1)LAUREL(8)TULALIP(4)SELBYVILLE(4)ODESSA(2)CAMDEN(2)WARM SPRINGS(4)MILTON(5)HARRINGTON(6)OLYMPIA(3)BELLINGHAM(1)FERNDALE(1)STANWOOD(3)CHESWOLD(5)AUBURN(1)FORT HALL(1)DELMAR(4)WAPATO(4)DELAWARE CITY(1)FELTON(8)TOPPENISH(6)DAGSBORO(8)TAHOLAH(4)FREDERICA(2)WELLPINIT(6)TAHOLA(2)SALISBURY(1)NESPELEM(7)METLAKATLA(1)KINGSTON(1)PORT GAMBLE(1)SHELTON(1)ELLENDALE(5)PENDLETON(1)PENDELTON(1)NEAH BAY(1)LA CONNER(2)LACONNER(1)BLADES(1)GREENWOOD(4)SKOKOMISH NATION(1)LINCOLN(4)REHOBOTH(3)OCEAN VIEW(3)LAPWAI(4)PLUMMER(3)TOKELAND(1)LA PUSH(1)LAPUSH(1)SLAUGHTER BEACH(1)SUQUAMISH(4)PORT ANGELES(2)OAKVILLE(2)WINTERTHUR(1)KENTON(4)SILETZ(2)SEQUIM(2)DEMING(4)HARTLY(3)HARBESON(1)LITTLE CREEK(2)SEDRO WOOLLEY(1)SEDRO WOOLEY(1)MALLOTT(1)USK(1)WASHINGTON(1)SALEM(1)POCATELLO(1)WHITE SWAN(1)CROFTON(1)OMAK(1)PORT PENN(1)NEW YORK(2)WILLOW STREET(1)QUINAULT(1)