Códigos ZIP con más infracciones de la EPA en California

Out of 622 ZIP codes with data in California, these are the highest-ranked areas for recorded epa violations. See also: National ZIP Codes with Most EPA Water Violations | All California Rankings

Statistic	Value
ZIP codes ranked	622
Highest value	46
Median value	2
State	California

Top 100 Worst ZIP Codes

Rank	ZIP Code	City	State	Recorded EPA Violations	Safety Score
1	92880	Corona	CA	46	60/100
2	93455	Santa Maria	CA	46	43/100
3	92503	Riverside	CA	45	60/100
4	92860	Norco	CA	45	44/100
5	92256	Morongo Valley	CA	43	—
6	92059	Pala	CA	42	70/100
7	92061	Pauma Valley	CA	42	87/100
8	92082	Valley Center	CA	42	70/100
9	93257	Porterville	CA	41	54/100
10	93247	Lindsay	CA	39	56/100
11	93420	Arroyo Grande	CA	37	62/100
12	93445	Oceano	CA	37	78/100
13	93307	Bakersfield	CA	29	42/100
14	93534	Lancaster	CA	29	70/100
15	93907	Salinas	CA	28	69/100
16	90660	Pico Rivera	CA	26	50/100
17	93536	Lancaster	CA	25	72/100
18	93560	Rosamond	CA	25	72/100
19	90606	Whittier	CA	24	50/100
20	91768	Pomona	CA	24	54/100
21	92065	Ramona	CA	23	82/100
22	95020	Gilroy	CA	23	—
23	95033	Los Gatos	CA	23	53/100
24	95037	Morgan Hill	CA	23	—
25	95326	Hughson	CA	23	84/100
26	92284	Yucca Valley	CA	22	74/100
27	92223	Beaumont	CA	20	65/100
28	92407	San Bernardino	CA	20	65/100
29	92320	Calimesa	CA	19	49/100
30	92220	Banning	CA	18	67/100
31	93245	Lemoore	CA	18	89/100
32	95006	Boulder Creek	CA	18	68/100
33	95060	Santa Cruz	CA	18	68/100
34	93243	Lebec	CA	17	72/100
35	93614	Coarsegold	CA	17	52/100
36	92411	San Bernardino	CA	16	70/100
37	92561	Mountain Center	CA	15	—
38	95315	Delhi	CA	15	—
39	95380	Turlock	CA	15	90/100
40	92356	Lucerne Valley	CA	14	—
41	93314	Bakersfield	CA	14	58/100
42	93454	Santa Maria	CA	14	58/100
43	94533	Fairfield	CA	14	85/100
44	94585	Suisun City	CA	14	85/100
45	95066	Scotts Valley	CA	14	67/100
46	95324	Hilmar	CA	14	100/100
47	96150	South Lake Tahoe	CA	14	61/100
48	93060	Santa Paula	CA	13	59/100
49	93274	Tulare	CA	13	58/100
50	93444	Nipomo	CA	13	83/100
51	93620	Dos Palos	CA	13	99/100
52	93665	South Dos Palos	CA	13	99/100
53	95370	Sonora	CA	13	76/100
54	95383	Twain Harte	CA	13	70/100
55	90640	Montebello	CA	12	51/100
56	91732	El Monte	CA	12	42/100
57	92308	Apple Valley	CA	12	62/100
58	93225	Frazier Park	CA	12	74/100
59	93446	Paso Robles	CA	12	59/100
60	95017	Davenport	CA	12	—
61	95346	Mi Wuk Village	CA	12	—
62	93312	Bakersfield	CA	11	58/100
63	93561	Tehachapi	CA	11	47/100
64	95333	Le Grand	CA	11	—
65	95404	Santa Rosa	CA	11	89/100
66	92236	Coachella	CA	10	70/100
67	93001	Ventura	CA	10	61/100
68	93012	Camarillo	CA	10	43/100
69	93023	Ojai	CA	10	59/100
70	93292	Visalia	CA	10	46/100
71	93426	Bradley	CA	10	—
72	93451	San Miguel	CA	10	—
73	95073	Soquel	CA	10	77/100
74	95305	Big Oak Flat	CA	10	56/100
75	95388	Winton	CA	10	87/100
76	91770	Rosemead	CA	9	72/100
77	92539	Anza	CA	9	—
78	93036	Oxnard	CA	9	56/100
79	93203	Arvin	CA	9	68/100
80	93308	Bakersfield	CA	9	48/100
81	93553	Pearblossom	CA	9	—
82	94574	Saint Helena	CA	9	—
83	95311	Coulterville	CA	9	—
84	95476	Sonoma	CA	9	69/100
85	95685	Sutter Creek	CA	9	76/100
86	96007	Anderson	CA	9	89/100
87	92544	Hemet	CA	8	72/100
88	92549	Idyllwild	CA	8	—
89	93230	Hanford	CA	8	86/100
90	93250	Mc Farland	CA	8	69/100
91	93551	Palmdale	CA	8	72/100
92	95018	Felton	CA	8	71/100
93	95023	Hollister	CA	8	60/100
94	95041	Mount Hermon	CA	8	—
95	95327	Jamestown	CA	8	77/100
96	90755	Signal Hill	CA	7	71/100
97	90806	Long Beach	CA	7	71/100
98	91006	Arcadia	CA	7	53/100
99	92251	Imperial	CA	7	83/100
100	92305	Angelus Oaks	CA	7	—

Methodology

Violation counts include all types recorded in the EPA SDWIS database: Maximum Contaminant Level (MCL) violations, treatment technique violations, and monitoring/reporting violations. Both resolved and unresolved violations are counted. Higher counts may reflect longer system histories or larger service areas.

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: 2026-08-31.

Frequently Asked Questions

What counts as an EPA water violation?

EPA violations include exceeding Maximum Contaminant Levels (MCLs), failing to treat water properly (treatment technique violations), and not testing or reporting on schedule (monitoring violations). Health-based violations are the most serious.

Does a high violation count mean the water is unsafe now?

Not necessarily. Many violations are historical or monitoring-related. However, a pattern of repeated violations indicates systemic issues with water system management or infrastructure.

Códigos ZIP con más infracciones de la EPA en California — 2026