Clasificaciones 2026

Sistemas de agua menos confiables en Maryland — 2026

Última actualización: 4 de junio de 2026

630 códigos postales clasificados por Reliability Score N.º 1: código postal 21901 (North East, MD) — 25/100
Plomo Infracciones Puntuación más baja Más seguros Riesgo de inundación Costo de energía Radón PFAS Confiabilidad Índice EJ Riesgo para compradores CO y gas Gas más seguro Carga de remediación Infracciones sin resolver (por proveedor) Equidad del agua (por proveedor)

Out of 630 ZIP codes with data in Maryland, these are the lowest-ranked areas for reliability score. See also: National Least Reliable Water Systems in America | All Maryland Rankings

Statistic Value
ZIP codes ranked 630
Lowest value 25/100
Median value 77/100
State Maryland

100 Lowest-Ranked ZIP Codes

Rank ZIP Code City State Reliability Score Safety Score
1 21901 North East MD 25/100 59/100
2 21903 Perryville MD 35/100 59/100
3 21639 Greensboro MD 37/100 89/100
4 21917 Colora MD 39/100 53/100
5 20619 California MD 40/100 53/100
6 21784 Sykesville MD 40/100 57/100
7 21645 Kennedyville MD 42/100 88/100
8 21911 Rising Sun MD 42/100 74/100
9 21913 Cecilton MD 44/100 56/100
10 21866 Tylerton MD 46/100 67/100
11 20658 Marbury MD 47/100 71/100
12 20794 Jessup MD 47/100 59/100
13 21041 Ellicott City MD 47/100 69/100
14 21042 Ellicott City MD 47/100 59/100
15 21562 Westernport MD 49/100 63/100
16 20602 Waldorf MD 50/100 77/100
17 20603 Waldorf MD 50/100 72/100
18 20604 Waldorf MD 50/100 77/100
19 20650 Leonardtown MD 51/100 70/100
20 21619 Chester MD 54/100 80/100
21 21842 Ocean City MD 54/100 73/100
22 21843 Ocean City MD 54/100 93/100
23 20601 Waldorf MD 55/100 72/100
24 21841 Newark MD 55/100 90/100
25 21904 Port Deposit MD 55/100 66/100
26 21078 Havre De Grace MD 57/100 56/100
27 21771 Mount Airy MD 57/100 69/100
28 20639 Huntingtown MD 59/100 50/100
29 21624 Claiborne MD 59/100 93/100
30 20608 Aquasco MD 60/100 53/100
31 20615 Broomes Island MD 60/100 55/100
32 20618 Bushwood MD 60/100 63/100
33 20643 Ironsides MD 60/100 53/100
34 20660 Morganza MD 60/100 53/100
35 20661 Mount Victoria MD 60/100 53/100
36 20662 Nanjemoy MD 60/100 63/100
37 20670 Patuxent River MD 60/100 80/100
38 20678 Prince Frederick MD 60/100 63/100
39 20682 Rock Point MD 60/100 53/100
40 20777 Highland MD 60/100 53/100
41 20838 Barnesville MD 60/100 66/100
42 21036 Dayton MD 60/100 40/100
43 21150 Simpsonville MD 60/100 40/100
44 21522 Bittinger MD 60/100 53/100
45 21531 Friendsville MD 60/100 55/100
46 21541 Mc Henry MD 60/100 63/100
47 21612 Bozman MD 60/100 65/100
48 21635 Galena MD 60/100 63/100
49 21647 Mcdaniel MD 60/100 73/100
50 21661 Rock Hall MD 60/100 78/100
51 21663 Saint Michaels MD 60/100 60/100
52 21665 Sherwood MD 60/100 65/100
53 21671 Tilghman MD 60/100 60/100
54 21676 Wittman MD 60/100 65/100
55 21723 Cooksville MD 60/100 40/100
56 21737 Glenelg MD 60/100 53/100
57 21738 Glenwood MD 60/100 53/100
58 21740 Hagerstown MD 60/100 63/100
59 21741 Hagerstown MD 60/100 68/100
60 21742 Hagerstown MD 60/100 58/100
61 21746 Hagerstown MD 60/100 64/100
62 21747 Hagerstown MD 60/100 64/100
63 21748 Hagerstown MD 60/100 64/100
64 21749 Hagerstown MD 60/100 64/100
65 21811 Berlin MD 60/100 78/100
66 21930 Georgetown MD 60/100 63/100
67 20871 Clarksburg MD 61/100 64/100
68 20664 Newburg MD 62/100 72/100
69 21157 Westminster MD 62/100 64/100
70 21158 Westminster MD 62/100 69/100
71 21632 Federalsburg MD 64/100 88/100
72 20606 Abell MD 65/100 63/100
73 20609 Avenue MD 65/100 55/100
74 20621 Chaptico MD 65/100 63/100
75 20624 Clements MD 65/100 53/100
76 20626 Coltons Point MD 65/100 55/100
77 20627 Compton MD 65/100 63/100
78 20635 Helen MD 65/100 53/100
79 20656 Loveville MD 65/100 53/100
80 20659 Mechanicsville MD 65/100 55/100
81 20667 Park Hall MD 65/100 63/100
82 21032 Crownsville MD 65/100 55/100
83 21035 Davidsonville MD 65/100 55/100
84 21114 Crofton MD 65/100 78/100
85 21520 Accident MD 65/100 82/100
86 21545 Mount Savage MD 65/100 55/100
87 21658 Queenstown MD 65/100 76/100
88 21765 Lisbon MD 65/100 40/100
89 21797 Woodbine MD 65/100 53/100
90 21798 Woodsboro MD 65/100 64/100
91 21810 Allen MD 65/100 63/100
92 21822 Eden MD 65/100 63/100
93 21872 Whaleyville MD 65/100 63/100
94 21914 Charlestown MD 65/100 55/100
95 21920 Elk Mills MD 65/100 53/100
96 21034 Darlington MD 66/100 62/100
97 20653 Lexington Park MD 67/100 77/100
98 20657 Lusby MD 67/100 51/100
99 21043 Ellicott City MD 67/100 54/100
100 21629 Denton MD 67/100 94/100

Methodology

Water system reliability scores (0-100) combine violation frequency, violation recency, resolution rate, and system size. Systems with repeated health-based violations and unresolved issues score lowest. The reliability score focuses specifically on the water utility performance, distinct from the broader Home Safety Score.

Data sources: EPA Safe Drinking Water Information System (SDWIS), FEMA National Flood Insurance Program, EPA radon zone maps, EIA electricity rates, and Consumer Confidence Reports. Last updated: 2026-06-04.

Frequently Asked Questions

What does a low water reliability score mean?

A low reliability score (below 50) indicates a water system with frequent violations, poor resolution rates, or recurring compliance issues. These systems may have aging infrastructure, inadequate treatment, or management challenges.

How is reliability different from safety score?

The reliability score focuses specifically on the water utility performance (violations, resolution, compliance). The Home Safety Score is broader, also including lead risk, radon, and flood data. A ZIP code can have a reliable water system but still have high radon or flood risk.

Explore More Rankings

Cómo se calcula esta clasificación, fuentes de datos y limitaciones: Metodología de clasificaciones →

Clasificaciones relacionadas

Seguridad del hogar 2026 Combinación de riesgo de agua, plomo, radón y ambiental PFAS 2026 Químicos eternos detectados en el agua potable Riesgo de plomo 2026 Infraestructura de tuberías de plomo y excedencias de la EPA
Aviso: Las clasificaciones se basan en datos de la EPA, la FEMA y agencias federales. Reflejan patrones históricos e indicadores de riesgo, no necesariamente las condiciones actuales. Para obtener la información más actual, los residentes pueden comunicarse con la compañía local de agua o solicitar un Informe de Confianza del Consumidor (CCR).

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