Least Reliable Water Systems in Oregon — 2026

Out of 482 ZIP codes with data in Oregon, these are the lowest-ranked areas for reliability score. See also: National Least Reliable Water Systems in America | All Oregon Rankings

Statistic	Value
ZIP codes ranked	482
Lowest value	10/100
Median value	71/100
State	Oregon

100 Lowest-Ranked ZIP Codes

Rank	ZIP Code	City	State	Reliability Score	Safety Score
1	97532	Merlin	OR	10/100	57/100
2	97901	Adrian	OR	20/100	50/100
3	97481	Tenmile	OR	22/100	94/100
4	97429	Days Creek	OR	23/100	91/100
5	97016	Clatskanie	OR	25/100	64/100
6	97024	Fairview	OR	25/100	61/100
7	97048	Rainier	OR	25/100	68/100
8	97138	Seaside	OR	25/100	60/100
9	97390	Tidewater	OR	25/100	68/100
10	97431	Dexter	OR	25/100	73/100
11	97446	Harrisburg	OR	25/100	78/100
12	97523	Cave Junction	OR	25/100	80/100
13	97470	Roseburg	OR	27/100	81/100
14	97471	Roseburg	OR	27/100	81/100
15	97630	Lakeview	OR	27/100	70/100
16	97820	Canyon City	OR	27/100	78/100
17	97055	Sandy	OR	28/100	66/100
18	97113	Cornelius	OR	28/100	76/100
19	97465	Port Orford	OR	28/100	91/100
20	97037	Maupin	OR	29/100	77/100
21	97864	Monument	OR	29/100	77/100
22	97050	Rufus	OR	30/100	67/100
23	97307	Keizer	OR	30/100	88/100
24	97463	Oakridge	OR	30/100	83/100
25	97038	Molalla	OR	31/100	78/100
26	97127	Lafayette	OR	31/100	72/100
27	97021	Dufur	OR	32/100	81/100
28	97459	North Bend	OR	32/100	86/100
29	97884	Unity	OR	32/100	78/100
30	97347	Grand Ronde	OR	34/100	93/100
31	97374	Scio	OR	34/100	83/100
32	97394	Waldport	OR	34/100	83/100
33	97423	Coquille	OR	34/100	90/100
34	97144	Timber	OR	35/100	69/100
35	97627	Keno	OR	35/100	69/100
36	97857	Lostine	OR	35/100	84/100
37	97870	Richland	OR	36/100	76/100
38	97031	Hood River	OR	37/100	82/100
39	97042	Mulino	OR	37/100	89/100
40	97064	Vernonia	OR	37/100	64/100
41	97119	Gaston	OR	37/100	82/100
42	97358	Lyons	OR	37/100	94/100
43	97378	Sheridan	OR	37/100	72/100
44	97420	Coos Bay	OR	37/100	81/100
45	97444	Gold Beach	OR	37/100	81/100
46	97448	Junction City	OR	37/100	89/100
47	97462	Oakland	OR	37/100	94/100
48	97539	Shady Cove	OR	37/100	94/100
49	97624	Chiloquin	OR	37/100	82/100
50	97754	Prineville	OR	37/100	72/100
51	97001	Antelope	OR	38/100	74/100
52	97415	Brookings	OR	38/100	83/100
53	97479	Sutherlin	OR	38/100	82/100
54	97434	Dorena	OR	39/100	90/100
55	97071	Woodburn	OR	40/100	81/100
56	97450	Langlois	OR	40/100	90/100
57	97458	Myrtle Point	OR	40/100	76/100
58	97469	Riddle	OR	40/100	65/100
59	97027	Gladstone	OR	41/100	78/100
60	97014	Cascade Locks	OR	42/100	81/100
61	97058	The Dalles	OR	42/100	82/100
62	97063	Tygh Valley	OR	42/100	82/100
63	97102	Arch Cape	OR	42/100	77/100
64	97342	Detroit	OR	42/100	98/100
65	97489	Walterville	OR	42/100	94/100
66	97365	Newport	OR	44/100	90/100
67	97115	Dundee	OR	45/100	79/100
68	97348	Halsey	OR	45/100	86/100
69	97907	Huntington	OR	45/100	73/100
70	97056	Scappoose	OR	47/100	77/100
71	97112	Cloverdale	OR	47/100	85/100
72	97371	Rickreall	OR	47/100	86/100
73	97375	Scotts Mills	OR	47/100	91/100
74	97524	Eagle Point	OR	47/100	89/100
75	97467	Reedsport	OR	48/100	88/100
76	97017	Colton	OR	49/100	97/100
77	97057	Shaniko	OR	49/100	77/100
78	97424	Cottage Grove	OR	49/100	81/100
79	97019	Corbett	OR	50/100	70/100
80	97022	Eagle Creek	OR	50/100	65/100
81	97067	Welches	OR	50/100	78/100
82	97132	Newberg	OR	50/100	69/100
83	97760	Terrebonne	OR	50/100	89/100
84	97818	Boardman	OR	50/100	59/100
85	97828	Enterprise	OR	50/100	81/100
86	97032	Hubbard	OR	52/100	98/100
87	97122	Hebo	OR	52/100	91/100
88	97381	Silverton	OR	52/100	79/100
89	97537	Rogue River	OR	52/100	89/100
90	97601	Klamath Falls	OR	52/100	79/100
91	97602	Klamath Falls	OR	52/100	78/100
92	97603	Klamath Falls	OR	52/100	78/100
93	97835	Helix	OR	52/100	82/100
94	97843	Ione	OR	52/100	82/100
95	97844	Irrigon	OR	52/100	82/100
96	97385	Sublimity	OR	53/100	95/100
97	97045	Oregon City	OR	54/100	80/100
98	97453	Mapleton	OR	54/100	83/100
99	97002	Aurora	OR	55/100	82/100
100	97030	Gresham	OR	55/100	77/100

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.