2026 Rankings

Least Reliable Water Systems in Rhode Island — 2026

Last updated: April 13, 2026

90 ZIP codes ranked by Reliability Score #1: ZIP 02833 (Hopkinton, RI) - 20/100
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 90 ZIP codes with data in Rhode Island, these are the lowest-ranked areas for reliability score. See also: National Least Reliable Water Systems in America | All Rhode Island Rankings

Statistic Value
ZIP codes ranked 90
Lowest value 20/100
Median value 78/100
State Rhode Island

90 Lowest-Ranked ZIP Codes

Rank ZIP Code City State Reliability Score Safety Score
1 02833 Hopkinton RI 20/100 59/100
2 02822 Exeter RI 25/100 62/100
3 02882 Narragansett RI 25/100 33/100
4 02825 Foster RI 28/100 48/100
5 02886 Warwick RI 42/100 54/100
6 02887 Warwick RI 42/100 64/100
7 02888 Warwick RI 42/100 54/100
8 02889 Warwick RI 42/100 49/100
9 02804 Ashaway RI 47/100 69/100
10 02874 Saunderstown RI 49/100 60/100
11 02871 Portsmouth RI 51/100 60/100
12 02879 Wakefield RI 51/100 52/100
13 02880 Wakefield RI 51/100 67/100
14 02896 North Smithfield RI 52/100 74/100
15 02814 Chepachet RI 55/100 78/100
16 02898 Wyoming RI 57/100 65/100
17 02813 Charlestown RI 59/100 53/100
18 02816 Coventry RI 60/100 55/100
19 02872 Prudence Island RI 60/100 79/100
20 02892 West Kingston RI 60/100 63/100
21 02917 Smithfield RI 64/100 76/100
22 02809 Bristol RI 65/100 80/100
23 02826 Glendale RI 65/100 83/100
24 02842 Middletown RI 65/100 72/100
25 02852 North Kingstown RI 67/100 54/100
26 02878 Tiverton RI 67/100 72/100
27 02807 Block Island RI 70/100 65/100
28 02832 Hope Valley RI 70/100 64/100
29 02835 Jamestown RI 70/100 71/100
30 02840 Newport RI 70/100 67/100
31 02841 Newport RI 70/100 82/100
32 02876 Slatersville RI 70/100 74/100
33 02891 Westerly RI 70/100 41/100
34 02801 Adamsville RI 75/100 63/100
35 02808 Bradford RI 75/100 53/100
36 02815 Clayville RI 75/100 53/100
37 02827 Greene RI 75/100 63/100
38 02830 Harrisville RI 75/100 63/100
39 02836 Kenyon RI 75/100 53/100
40 02837 Little Compton RI 75/100 55/100
41 02839 Mapleville RI 75/100 53/100
42 02858 Oakland RI 75/100 63/100
43 02873 Rockville RI 75/100 40/100
44 02894 Wood River Junction RI 75/100 53/100
45 02864 Cumberland RI 78/100 78/100
46 02865 Lincoln RI 78/100 78/100
47 02901 Providence RI 79/100 65/100
48 02902 Providence RI 79/100 69/100
49 02903 Providence RI 79/100 64/100
50 02904 Providence RI 79/100 54/100
51 02905 Providence RI 79/100 59/100
52 02906 Providence RI 79/100 64/100
53 02907 Providence RI 79/100 64/100
54 02908 Providence RI 79/100 64/100
55 02909 Providence RI 79/100 59/100
56 02912 Providence RI 79/100 65/100
57 02918 Providence RI 79/100 65/100
58 02940 Providence RI 79/100 69/100
59 02802 Albion RI 80/100 63/100
60 02812 Carolina RI 80/100 40/100
61 02818 East Greenwich RI 80/100 35/100
62 02823 Fiskeville RI 80/100 40/100
63 02824 Forestdale RI 80/100 53/100
64 02828 Greenville RI 80/100 83/100
65 02829 Harmony RI 80/100 53/100
66 02831 Hope RI 80/100 45/100
67 02857 North Scituate RI 80/100 63/100
68 02859 Pascoag RI 80/100 78/100
69 02860 Pawtucket RI 80/100 78/100
70 02861 Pawtucket RI 80/100 83/100
71 02862 Pawtucket RI 80/100 83/100
72 02875 Shannock RI 80/100 40/100
73 02877 Slocum RI 80/100 53/100
74 02881 Kingston RI 80/100 70/100
75 02883 Peace Dale RI 80/100 40/100
76 02885 Warren RI 80/100 84/100
77 02893 West Warwick RI 80/100 40/100
78 02895 Woonsocket RI 80/100 74/100
79 02919 Johnston RI 80/100 50/100
80 02817 West Greenwich RI 83/100 64/100
81 02806 Barrington RI 90/100 55/100
82 02838 Manville RI 90/100 63/100
83 02863 Central Falls RI 90/100 55/100
84 02914 East Providence RI 90/100 73/100
85 02916 Rumford RI 90/100 55/100
86 02910 Cranston RI 95/100 45/100
87 02911 North Providence RI 95/100 50/100
88 02915 Riverside RI 95/100 55/100
89 02920 Cranston RI 95/100 45/100
90 02921 Cranston RI 95/100 55/100

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: 2026-04-13.

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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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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