2026 Rankings

Least Reliable Water Systems in Pennsylvania — 2026

Last updated: June 4, 2026

2,249 ZIP codes ranked by Reliability Score #1: ZIP 16229 (Freeport, PA) — 15/100
Lead Violations Lowest Score Safest Flood Risk Energy Cost Radon PFAS Reliability EJ Index Homebuyer Risk CO & Gas Safest Gas Remediation Burden Unresolved Violations (by Utility) Water Equity (by Utility)

Out of 2,249 ZIP codes with data in Pennsylvania, these are the lowest-ranked areas for reliability score. See also: National Least Reliable Water Systems in America | All Pennsylvania Rankings

Statistic Value
ZIP codes ranked 2,249
Lowest value 15/100
Median value 70/100
State Pennsylvania

100 Lowest-Ranked ZIP Codes

Rank ZIP Code City State Reliability Score Safety Score
1 16229 Freeport PA 15/100 27/100
2 15012 Belle Vernon PA 24/100 71/100
3 15059 Midland PA 25/100 42/100
4 15737 Elmora PA 25/100 65/100
5 16049 Parker PA 25/100 15/100
6 16342 Polk PA 25/100 32/100
7 17315 Dover PA 25/100 45/100
8 18332 Henryville PA 25/100 57/100
9 18970 Trumbauersville PA 25/100 53/100
10 17020 Duncannon PA 28/100 26/100
11 18372 Tannersville PA 28/100 33/100
12 18330 Effort PA 29/100 55/100
13 18818 Friendsville PA 29/100 54/100
14 17040 Landisburg PA 30/100 45/100
15 18076 Red Hill PA 30/100 31/100
16 18419 Factoryville PA 30/100 37/100
17 19083 Havertown PA 30/100 10/100
18 18360 Stroudsburg PA 31/100 32/100
19 15331 Ellsworth PA 33/100 65/100
20 17236 Mercersburg PA 34/100 60/100
21 19348 Kennett Square PA 34/100 50/100
22 15333 Fredericktown PA 35/100 61/100
23 15474 Point Marion PA 35/100 45/100
24 16110 Adamsville PA 35/100 58/100
25 16726 Cyclone PA 35/100 39/100
26 16940 Nelson PA 35/100 48/100
27 18353 Saylorsburg PA 35/100 43/100
28 18405 Beach Lake PA 35/100 62/100
29 18458 Shohola PA 35/100 63/100
30 18657 Tunkhannock PA 36/100 44/100
31 16678 Saxton PA 37/100 56/100
32 17754 Montoursville PA 37/100 54/100
33 17771 Trout Run PA 37/100 31/100
34 17952 Mary D PA 37/100 54/100
35 15077 Shippingport PA 38/100 43/100
36 17078 Palmyra PA 38/100 42/100
37 18813 Brooklyn PA 38/100 58/100
38 19341 Exton PA 38/100 48/100
39 16682 Sproul PA 39/100 27/100
40 17047 Loysville PA 39/100 43/100
41 18240 Nesquehoning PA 39/100 43/100
42 15003 Ambridge PA 40/100 54/100
43 15824 Brockway PA 40/100 64/100
44 17737 Hughesville PA 40/100 26/100
45 17745 Lock Haven PA 40/100 41/100
46 18030 Bowmanstown PA 40/100 38/100
47 18235 Lehighton PA 40/100 59/100
48 18252 Tamaqua PA 40/100 47/100
49 18425 Greeley PA 40/100 54/100
50 18603 Berwick PA 40/100 21/100
51 19311 Avondale PA 40/100 38/100
52 19342 Glen Mills PA 40/100 51/100
53 19492 Zieglerville PA 40/100 37/100
54 15437 Farmington PA 41/100 72/100
55 18301 East Stroudsburg PA 41/100 59/100
56 18302 East Stroudsburg PA 41/100 59/100
57 18426 Greentown PA 41/100 55/100
58 18438 Lakeville PA 41/100 72/100
59 16235 Lucinda PA 42/100 58/100
60 17070 New Cumberland PA 42/100 43/100
61 17822 Danville PA 42/100 65/100
62 18039 Durham PA 42/100 61/100
63 18336 Matamoras PA 42/100 64/100
64 19543 Morgantown PA 42/100 69/100
65 15436 Fairchance PA 44/100 81/100
66 15717 Blairsville PA 44/100 73/100
67 15840 Falls Creek PA 44/100 60/100
68 15863 Stump Creek PA 44/100 73/100
69 16423 Lake City PA 44/100 73/100
70 16428 North East PA 44/100 71/100
71 16872 Rebersburg PA 44/100 57/100
72 16875 Spring Mills PA 44/100 55/100
73 17763 Ralston PA 44/100 52/100
74 17850 Montandon PA 44/100 52/100
75 18470 Union Dale PA 44/100 60/100
76 18708 Shavertown PA 44/100 38/100
77 19468 Royersford PA 44/100 52/100
78 15411 Addison PA 45/100 65/100
79 16125 Greenville PA 45/100 64/100
80 16351 Tidioute PA 45/100 66/100
81 17048 Lykens PA 45/100 46/100
82 17057 Middletown PA 45/100 44/100
83 17233 Mc Connellsburg PA 45/100 39/100
84 17765 Roaring Branch PA 45/100 45/100
85 18212 Ashfield PA 45/100 48/100
86 18349 Pocono Manor PA 45/100 26/100
87 18448 Olyphant PA 45/100 16/100
88 18612 Dallas PA 45/100 26/100
89 18615 Falls PA 45/100 46/100
90 18801 Montrose PA 45/100 26/100
91 18951 Quakertown PA 45/100 46/100
92 18976 Warrington PA 45/100 55/100
93 15104 Braddock PA 46/100 34/100
94 15110 Duquesne PA 46/100 67/100
95 16341 Pleasantville PA 46/100 59/100
96 16601 Altoona PA 46/100 54/100
97 16602 Altoona PA 46/100 54/100
98 16603 Altoona PA 46/100 64/100
99 16692 Westover PA 46/100 56/100
100 16823 Bellefonte PA 46/100 51/100

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

How this ranking is calculated, data sources, and limitations: Rankings Methodology →

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Home Safety 2026 Combined water, lead, radon and environmental risk PFAS 2026 Forever chemicals detected in drinking water Lead Risk 2026 Lead pipe infrastructure and EPA exceedances
Disclaimer: Rankings are based on EPA, FEMA, and federal agency data. They reflect historical patterns and risk indicators, not necessarily current conditions. For the most current information, contact your local water utility or request a Consumer Confidence Report.

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