Detecciones de PFAS en códigos ZIP de California

Out of 655 ZIP codes with data in California, these are the highest-ranked areas for pfas status. See also: National ZIP Codes with PFAS Detections in Water | All California Rankings

Statistic	Value
ZIP codes ranked	655
Highest value	0.3 ppt
Median value	0.0 ppt
State	California

Top 100 Worst ZIP Codes

Rank	ZIP Code	City	State	PFAS Status	Safety Score
1	91963	Potrero	CA	0.3 ppt	55/100
2	92382	Running Springs	CA	0.2 ppt	74/100
3	93550	Palmdale	CA	0.1 ppt	78/100
4	90650	Norwalk	CA	0.1 ppt	75/100
5	90670	Santa Fe Springs	CA	0.1 ppt	82/100
6	90701	Artesia	CA	0.1 ppt	63/100
7	90706	Bellflower	CA	0.1 ppt	78/100
8	90707	Bellflower	CA	0.1 ppt	83/100
9	95301	Atwater	CA	0.1 ppt	90/100
10	90640	Montebello	CA	0.1 ppt	80/100
11	92345	Hesperia	CA	0.1 ppt	66/100
12	93701	Fresno	CA	0.0 ppt	75/100
13	93702	Fresno	CA	0.0 ppt	75/100
14	93703	Fresno	CA	0.0 ppt	75/100
15	93704	Fresno	CA	0.0 ppt	70/100
16	93705	Fresno	CA	0.0 ppt	70/100
17	93706	Fresno	CA	0.0 ppt	75/100
18	93710	Fresno	CA	0.0 ppt	70/100
19	93711	Fresno	CA	0.0 ppt	70/100
20	93720	Fresno	CA	0.0 ppt	70/100
21	93721	Fresno	CA	0.0 ppt	75/100
22	93722	Fresno	CA	0.0 ppt	75/100
23	93723	Fresno	CA	0.0 ppt	73/100
24	93725	Fresno	CA	0.0 ppt	75/100
25	93726	Fresno	CA	0.0 ppt	70/100
26	93727	Fresno	CA	0.0 ppt	75/100
27	93728	Fresno	CA	0.0 ppt	70/100
28	93730	Fresno	CA	0.0 ppt	73/100
29	90240	Downey	CA	0.0 ppt	78/100
30	90241	Downey	CA	0.0 ppt	83/100
31	90242	Downey	CA	0.0 ppt	83/100
32	95652	Mcclellan	CA	0.0 ppt	65/100
33	95660	North Highlands	CA	0.0 ppt	79/100
34	95673	Rio Linda	CA	0.0 ppt	72/100
35	95758	Elk Grove	CA	0.0 ppt	70/100
36	95811	Sacramento	CA	0.0 ppt	78/100
37	95814	Sacramento	CA	0.0 ppt	78/100
38	95815	Sacramento	CA	0.0 ppt	73/100
39	95816	Sacramento	CA	0.0 ppt	73/100
40	95817	Sacramento	CA	0.0 ppt	78/100
41	95818	Sacramento	CA	0.0 ppt	73/100
42	95819	Sacramento	CA	0.0 ppt	73/100
43	95820	Sacramento	CA	0.0 ppt	73/100
44	95821	Sacramento	CA	0.0 ppt	78/100
45	95822	Sacramento	CA	0.0 ppt	68/100
46	95823	Sacramento	CA	0.0 ppt	68/100
47	95824	Sacramento	CA	0.0 ppt	78/100
48	95825	Sacramento	CA	0.0 ppt	73/100
49	95826	Sacramento	CA	0.0 ppt	73/100
50	95828	Sacramento	CA	0.0 ppt	78/100
51	95829	Sacramento	CA	0.0 ppt	78/100
52	95831	Sacramento	CA	0.0 ppt	73/100
53	95832	Sacramento	CA	0.0 ppt	78/100
54	95833	Sacramento	CA	0.0 ppt	68/100
55	95834	Sacramento	CA	0.0 ppt	73/100
56	95835	Sacramento	CA	0.0 ppt	78/100
57	95838	Sacramento	CA	0.0 ppt	73/100
58	95841	Sacramento	CA	0.0 ppt	73/100
59	95864	Sacramento	CA	0.0 ppt	73/100
60	93611	Clovis	CA	0.0 ppt	70/100
61	93612	Clovis	CA	0.0 ppt	70/100
62	93619	Clovis	CA	0.0 ppt	70/100
63	90201	Bell Gardens	CA	0.0 ppt	75/100
64	92314	Big Bear City	CA	0.0 ppt	70/100
65	93257	Porterville	CA	0.0 ppt	69/100
66	93274	Tulare	CA	0.0 ppt	50/100
67	93277	Visalia	CA	0.0 ppt	66/100
68	93291	Visalia	CA	0.0 ppt	66/100
69	93292	Visalia	CA	0.0 ppt	66/100
70	93423	Atascadero	CA	0.0 ppt	78/100
71	92860	Norco	CA	0.0 ppt	65/100
72	90660	Pico Rivera	CA	0.0 ppt	74/100
73	91761	Ontario	CA	0.0 ppt	83/100
74	91762	Ontario	CA	0.0 ppt	83/100
75	91764	Ontario	CA	0.0 ppt	78/100
76	92801	Anaheim	CA	0.0 ppt	94/100
77	92802	Anaheim	CA	0.0 ppt	94/100
78	92803	Anaheim	CA	0.0 ppt	98/100
79	92804	Anaheim	CA	0.0 ppt	89/100
80	92805	Anaheim	CA	0.0 ppt	94/100
81	92806	Anaheim	CA	0.0 ppt	94/100
82	92807	Anaheim	CA	0.0 ppt	89/100
83	92808	Anaheim	CA	0.0 ppt	94/100
84	92509	Riverside	CA	0.0 ppt	78/100
85	90058	Los Angeles	CA	0.0 ppt	78/100
86	90270	Maywood	CA	0.0 ppt	72/100
87	90280	South Gate	CA	0.0 ppt	83/100
88	94566	Pleasanton	CA	0.0 ppt	73/100
89	94588	Pleasanton	CA	0.0 ppt	73/100
90	95350	Modesto	CA	0.0 ppt	95/100
91	95351	Modesto	CA	0.0 ppt	90/100
92	95354	Modesto	CA	0.0 ppt	90/100
93	95355	Modesto	CA	0.0 ppt	95/100
94	95356	Modesto	CA	0.0 ppt	99/100
95	95357	Modesto	CA	0.0 ppt	95/100
96	95358	Modesto	CA	0.0 ppt	90/100
97	92570	Perris	CA	0.0 ppt	78/100
98	91901	Alpine	CA	0.0 ppt	66/100
99	95307	Ceres	CA	0.0 ppt	71/100
100	95624	Elk Grove	CA	0.0 ppt	65/100

Methodology

PFAS detection data comes from EPA UCMR5 monitoring, state-level testing programs, and Consumer Confidence Reports. ZIP codes are ranked by maximum PFAS concentration detected. The EPA has set MCLs of 4 ppt for PFOA and PFOS individually. PFAS are persistent chemicals that do not break down in the environment.

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 are PFAS?

PFAS (per- and polyfluoroalkyl substances) are synthetic chemicals used in non-stick coatings, firefighting foam, and food packaging since the 1940s. They are called "forever chemicals" because they do not break down naturally. PFAS are linked to cancer, liver damage, thyroid disease, and immune system suppression.

How can I remove PFAS from my water?

Reverse osmosis (RO) and granular activated carbon (GAC) filters are effective at removing most PFAS from drinking water. NSF/ANSI 53 or 58 certified filters are recommended. Boiling water does NOT remove PFAS.

Detecciones de PFAS en códigos ZIP de California — 2026

Top 100 Worst ZIP Codes

Methodology

Frequently Asked Questions

What are PFAS?

How can I remove PFAS from my water?

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