PFAS Detections in California ZIP Codes — 2026

Out of 612 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	612
Highest value	0.2 ppt
Median value	0.0 ppt
State	California

Top 100 Worst ZIP Codes

Rank	ZIP Code	City	State	PFAS Status	Safety Score
1	92382	Running Springs	CA	0.2 ppt	57/100
2	93550	Palmdale	CA	0.1 ppt	58/100
3	90650	Norwalk	CA	0.1 ppt	56/100
4	90670	Santa Fe Springs	CA	0.1 ppt	58/100
5	90701	Artesia	CA	0.1 ppt	56/100
6	90706	Bellflower	CA	0.1 ppt	57/100
7	95301	Atwater	CA	0.1 ppt	75/100
8	90640	Montebello	CA	0.1 ppt	51/100
9	92345	Hesperia	CA	0.1 ppt	58/100
10	93701	Fresno	CA	0.0 ppt	58/100
11	93702	Fresno	CA	0.0 ppt	58/100
12	93703	Fresno	CA	0.0 ppt	58/100
13	93704	Fresno	CA	0.0 ppt	58/100
14	93705	Fresno	CA	0.0 ppt	58/100
15	93706	Fresno	CA	0.0 ppt	55/100
16	93710	Fresno	CA	0.0 ppt	58/100
17	93711	Fresno	CA	0.0 ppt	58/100
18	93720	Fresno	CA	0.0 ppt	58/100
19	93721	Fresno	CA	0.0 ppt	58/100
20	93722	Fresno	CA	0.0 ppt	54/100
21	93723	Fresno	CA	0.0 ppt	58/100
22	93725	Fresno	CA	0.0 ppt	54/100
23	93726	Fresno	CA	0.0 ppt	58/100
24	93727	Fresno	CA	0.0 ppt	54/100
25	93728	Fresno	CA	0.0 ppt	58/100
26	93730	Fresno	CA	0.0 ppt	58/100
27	90240	Downey	CA	0.0 ppt	58/100
28	90241	Downey	CA	0.0 ppt	58/100
29	90242	Downey	CA	0.0 ppt	58/100
30	95652	Mcclellan	CA	0.0 ppt	83/100
31	95660	North Highlands	CA	0.0 ppt	83/100
32	95673	Rio Linda	CA	0.0 ppt	83/100
33	95758	Elk Grove	CA	0.0 ppt	79/100
34	95811	Sacramento	CA	0.0 ppt	83/100
35	95814	Sacramento	CA	0.0 ppt	83/100
36	95815	Sacramento	CA	0.0 ppt	75/100
37	95816	Sacramento	CA	0.0 ppt	83/100
38	95817	Sacramento	CA	0.0 ppt	83/100
39	95818	Sacramento	CA	0.0 ppt	83/100
40	95819	Sacramento	CA	0.0 ppt	83/100
41	95820	Sacramento	CA	0.0 ppt	83/100
42	95821	Sacramento	CA	0.0 ppt	83/100
43	95822	Sacramento	CA	0.0 ppt	83/100
44	95823	Sacramento	CA	0.0 ppt	79/100
45	95824	Sacramento	CA	0.0 ppt	75/100
46	95825	Sacramento	CA	0.0 ppt	75/100
47	95826	Sacramento	CA	0.0 ppt	78/100
48	95828	Sacramento	CA	0.0 ppt	78/100
49	95829	Sacramento	CA	0.0 ppt	78/100
50	95831	Sacramento	CA	0.0 ppt	83/100
51	95832	Sacramento	CA	0.0 ppt	83/100
52	95833	Sacramento	CA	0.0 ppt	83/100
53	95834	Sacramento	CA	0.0 ppt	83/100
54	95835	Sacramento	CA	0.0 ppt	83/100
55	95838	Sacramento	CA	0.0 ppt	83/100
56	95841	Sacramento	CA	0.0 ppt	83/100
57	95864	Sacramento	CA	0.0 ppt	75/100
58	93611	Clovis	CA	0.0 ppt	58/100
59	93612	Clovis	CA	0.0 ppt	58/100
60	93619	Clovis	CA	0.0 ppt	58/100
61	90201	Bell Gardens	CA	0.0 ppt	58/100
62	92314	Big Bear City	CA	0.0 ppt	58/100
63	93257	Porterville	CA	0.0 ppt	54/100
64	93274	Tulare	CA	0.0 ppt	58/100
65	93277	Visalia	CA	0.0 ppt	58/100
66	93291	Visalia	CA	0.0 ppt	58/100
67	93292	Visalia	CA	0.0 ppt	46/100
68	92860	Norco	CA	0.0 ppt	44/100
69	90660	Pico Rivera	CA	0.0 ppt	50/100
70	91761	Ontario	CA	0.0 ppt	58/100
71	91762	Ontario	CA	0.0 ppt	58/100
72	91764	Ontario	CA	0.0 ppt	58/100
73	92801	Anaheim	CA	0.0 ppt	74/100
74	92802	Anaheim	CA	0.0 ppt	74/100
75	92804	Anaheim	CA	0.0 ppt	70/100
76	92805	Anaheim	CA	0.0 ppt	74/100
77	92806	Anaheim	CA	0.0 ppt	74/100
78	92807	Anaheim	CA	0.0 ppt	74/100
79	92808	Anaheim	CA	0.0 ppt	74/100
80	92509	Riverside	CA	0.0 ppt	75/100
81	90058	Los Angeles	CA	0.0 ppt	58/100
82	90270	Maywood	CA	0.0 ppt	58/100
83	90280	South Gate	CA	0.0 ppt	58/100
84	94566	Pleasanton	CA	0.0 ppt	—
85	94588	Pleasanton	CA	0.0 ppt	—
86	95350	Modesto	CA	0.0 ppt	75/100
87	95351	Modesto	CA	0.0 ppt	67/100
88	95354	Modesto	CA	0.0 ppt	75/100
89	95355	Modesto	CA	0.0 ppt	75/100
90	95356	Modesto	CA	0.0 ppt	74/100
91	95357	Modesto	CA	0.0 ppt	74/100
92	95358	Modesto	CA	0.0 ppt	75/100
93	92570	Perris	CA	0.0 ppt	74/100
94	91901	Alpine	CA	0.0 ppt	92/100
95	95307	Ceres	CA	0.0 ppt	71/100
96	95624	Elk Grove	CA	0.0 ppt	79/100
97	95757	Elk Grove	CA	0.0 ppt	75/100
98	95830	Sacramento	CA	0.0 ppt	78/100
99	90255	Huntington Park	CA	0.0 ppt	58/100
100	90262	Lynwood	CA	0.0 ppt	58/100

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: 2026-08-31.

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.