PFAS Contamination

PFAS in California Drinking Water

Ranked by number of PFAS compounds detected · Data from EPA SDWIS & UCMR

464

Cities Tested

124

Exceeds Limit

27%

% Exceeds Limit

2.2 compounds

State Avg

▲ 6% vs national

vs National

620

Health Violations

Analysis

PFAS in California: what the data shows

California has 464 cities with PFAS monitoring data from the EPA's UCMR 5 program. PFAS ("forever chemicals") were detected in 310 of those cities (67%), with many cities exceeding the EPA's 2024 maximum contaminant levels of 4 ppt. The state average is worse than the national average. 124 cities exceed the EPA MCL for at least one PFAS compound. PFAS are linked to cancer, immune system disruption, and developmental issues. The 2024 EPA rule requires water systems exceeding the MCL to notify customers and reduce levels by 2029. PFAS data comes from the EPA's Unregulated Contaminant Monitoring Rule 5 (UCMR 5), which required large water systems to test for 29 PFAS compounds between 2023–2025. Not all systems have completed testing — cities without data may still have PFAS present.

Comparison

Cities exceeding EPA MCL (4 ppt each)

California

27%

124 of 464 cities

→ ▲ 6% above national rate (worse)

National avg

21%

1636 of 7745 cities

City Map

PFAS data across California

Each dot is a city, colored by overall water quality grade. PFAS-tested cities are shown; those exceeding the 4 ppt EPA MCL appear in red. Size reflects population served.

Worst Offenders

Top 10 cities by pfas level in California

Highest PFAS levels (compounds)

All Cities

All California cities ranked by pfas level

#	City	Level	Exceeds?	Violations	Grade
1	Running Springs	11 compounds	Yes	3	B
2	Fresno	10 compounds	Yes	523	F
3	Clovis	10 compounds	Yes	221	F
4	Montebello	10 compounds	Yes	5	B
5	Atwater	10 compounds	Yes	3	B+
6	Grand Terrace	10 compounds	Yes	1	B
7	San Jose	9 compounds	Yes	142	F
8	Sacramento	9 compounds	Yes	425	F
9	Downey	9 compounds	Yes	14	B
10	Newhall	9 compounds	Yes	1	B+
11	San Dimas	9 compounds	Yes	6	B-
12	Chula Vista	9 compounds	Yes	1	B+
13	Glendale	9 compounds	Yes	0	A-
14	Pleasanton	9 compounds	Yes	3	B-
15	Temecula	9 compounds	Yes	12	C+
16	Fullerton	9 compounds	Yes	8	B
17	South Lake Tahoe	9 compounds	Yes	15	C
18	Pacific Grove	9 compounds	Yes	15	B-
19	Porterville	9 compounds	Yes	74	F
20	Pico Rivera	9 compounds	Yes	4	B
21	Ukiah	9 compounds	Yes	14	C+
22	Los Osos	9 compounds	Yes	0	B+
23	Anaheim	8 compounds	Yes	8	C+
24	Covina	8 compounds	Yes	10	B
25	Modesto	8 compounds	Yes	76	D
26	Orange	8 compounds	Yes	3	B
27	Redding	8 compounds	Yes	49	F
28	Highland	8 compounds	Yes	3	B+
29	Hesperia	8 compounds	Yes	2	B
30	Gilroy	8 compounds	Yes	28	C+
31	Ceres	8 compounds	Yes	129	F
32	Paso Robles	8 compounds	Yes	42	F
33	Atascadero	8 compounds	Yes	1	B
34	Tehachapi	8 compounds	Yes	96	F
35	Altadena	8 compounds	Yes	2	B+
36	Norco	8 compounds	Yes	39	F
37	Crestline	8 compounds	Yes	9	C+
38	Pinedale	8 compounds	Yes	7	A-
39	Big Bear City	8 compounds	Yes	1	A
40	Bell Gardens	8 compounds	Yes	0	B
41	Lake Arrowhead	8 compounds	Yes	0	A-
42	Helendale	8 compounds	Yes	22	A-
43	La Habra Heights	8 compounds	Yes	0	A
44	Riverside	7 compounds	Yes	13	C
45	Pomona	7 compounds	Yes	6	C+
46	Garden Grove	7 compounds	Yes	2	B
47	Rialto	7 compounds	Yes	6	B+
48	Santa Monica	7 compounds	Yes	0	B
49	Whittier	7 compounds	Yes	4	C+
50	Lodi	7 compounds	Yes	16	C+
51	Watsonville	7 compounds	Yes	74	F
52	La Crescenta	7 compounds	Yes	3	B+
53	Arroyo Grande	7 compounds	Yes	93	F
54	El Verano	7 compounds	Yes	0	B+
55	West Covina	7 compounds	Yes	25	F
56	Coarsegold	7 compounds	Yes	24	C-
57	San Francisco	7 compounds	No	100	F
58	Santa Ana	6 compounds	Yes	8	C
59	Stockton	6 compounds	Yes	261	F
60	Ontario	6 compounds	Yes	1	B+
61	Bakersfield	6 compounds	Yes	690	F
62	Camarillo	6 compounds	Yes	4	B
63	South Gate	6 compounds	Yes	2	B
64	Apple Valley	6 compounds	Yes	57	D
65	Colton	6 compounds	Yes	5	B-
66	Valley Center	6 compounds	Yes	15	F
67	Monrovia	6 compounds	Yes	0	B+
68	Norwalk	6 compounds	Yes	1	A-
69	Santa Fe Springs	6 compounds	Yes	1	B+
70	Gridley	6 compounds	Yes	4	B
71	Nuevo	6 compounds	Yes	6	B+
72	Brisbane	6 compounds	Yes	5	A-
73	Wildomar	6 compounds	Yes	11	A-
74	Hawthorne	5 compounds	No	3	B
75	Rosemead	5 compounds	Yes	17	C-
76	San Bernardin0	5 compounds	No	0	A-
77	Corona	5 compounds	No	81	D
78	San Bernardino	5 compounds	No	192	F
79	Encinitas	5 compounds	Yes	55	F
80	Lynwood	5 compounds	Yes	0	B+
81	Montclair	5 compounds	Yes	0	B+
82	Vacaville	5 compounds	Yes	26	F
83	Fair Oaks	5 compounds	Yes	0	B+
84	Big Bear Lake	5 compounds	Yes	1	B+
85	Cudahy	5 compounds	Yes	3	B+
86	Pala	5 compounds	Yes	30	C-
87	El Monte	4 compounds	Yes	79	F
88	Merced	4 compounds	Yes	9	C+
89	Manteca	4 compounds	Yes	39	B-
90	Redlands	4 compounds	Yes	2	B
91	Compton	4 compounds	Yes	8	B
92	Tustin	4 compounds	Yes	8	B
93	Yucaipa	4 compounds	Yes	9	C+
94	Truckee	4 compounds	Yes	7	A-
95	Rohnert Park	4 compounds	Yes	21	F
96	Sonora	4 compounds	No	25	D+
97	Huntington Park	4 compounds	Yes	3	B+
98	Lakeside	4 compounds	Yes	0	A-
99	Yucca Valley	4 compounds	No	7	A-
100	Sanger	4 compounds	Yes	16	C
101	Red Bluff	4 compounds	Yes	23	F
102	Ripon	4 compounds	Yes	10	A-
103	Maywood	4 compounds	Yes	3	A-
104	Calimesa	4 compounds	No	6	B
105	Castaic	4 compounds	Yes	17	F
106	Calistoga	4 compounds	Yes	15	C+
107	Lindsay	4 compounds	Yes	240	F
108	Irvine	3 compounds	No	84	F
109	Huntington Beach	3 compounds	Yes	5	C-
110	Jurupa Valley	3 compounds	No	62	B
111	Palmdale	3 compounds	No	15	C+
112	Ventura	3 compounds	No	21	D+
113	Azusa	3 compounds	Yes	2	B+
114	Burbank	3 compounds	No	1	A-
115	Westminster	3 compounds	Yes	2	A-
116	Goleta	3 compounds	No	11	B
117	Placentia	3 compounds	No	0	B+
118	Buena Park	3 compounds	Yes	1	B+
119	Upland	3 compounds	No	4	B+
120	Camp Pendleton	3 compounds	No	13	B
121	Adelanto	3 compounds	Yes	13	C
122	Lathrop	3 compounds	Yes	44	B
123	Phelan	3 compounds	No	0	B+
124	Benicia	3 compounds	No	1	A-
125	Rancho Santa Fe	3 compounds	No	3	A-
126	Lomita	3 compounds	Yes	1	A-
127	Rio Linda	3 compounds	No	2	A-
128	Clearlake	3 compounds	No	5	B+
129	Sonoma	3 compounds	Yes	5	B-
130	Scotts Valley	3 compounds	No	11	B-
131	Healdsburg	3 compounds	No	12	B+
132	Templeton	3 compounds	No	1	A
133	Villa Park	3 compounds	No	1	A-
134	Planada	3 compounds	Yes	3	B+
135	Laton	3 compounds	Yes	49	C+
136	Escondido	2 compounds	No	10	B
137	Lake Elsinore	2 compounds	No	8	A
138	Rancho Cordova	2 compounds	No	115	F
139	Santee	2 compounds	No	14	B
140	Inglewood	2 compounds	Yes	3	A-
141	Lakewood	2 compounds	Yes	1	A-
142	Laguna Beach	2 compounds	No	2	B
143	Monterey Park	2 compounds	No	1	B
144	Fountain Valley	2 compounds	No	0	A
145	Rowland Heights	2 compounds	No	0	B+
146	Lincoln	2 compounds	Yes	6	A-
147	Hollister	2 compounds	Yes	132	F
148	Lake Forest	2 compounds	No	38	B-
149	Arcadia	2 compounds	Yes	2	B
150	Banning	2 compounds	No	15	B-
151	Cerritos	2 compounds	Yes	0	B
152	Bellflower	2 compounds	Yes	0	B+
153	Elk Grove	2 compounds	No	28	C
154	Carmichael	2 compounds	No	1	B+
155	Loma Linda	2 compounds	Yes	3	A
156	Oroville	2 compounds	Yes	7	C-
157	Boulder Creek	2 compounds	No	119	F
158	Alpine	2 compounds	No	25	C-
159	Live Oak	2 compounds	No	26	A-
160	Delhi	2 compounds	Yes	7	A-
161	Solvang	2 compounds	No	6	B
162	Winters	2 compounds	No	1	A+
163	Wheatland	2 compounds	Yes	2	A
164	Weaverville	2 compounds	Yes	3	A-
165	Avalon	2 compounds	No	1	A-
166	Alturas	2 compounds	No	11	B+
167	Groveland	2 compounds	Yes	4	B-
168	Los Angeles	1 compounds	No	94	F
169	Oakland	1 compounds	No	13	B
170	San Diego	1 compounds	No	43	F
171	Perris	1 compounds	No	0	A
172	Long Beach	1 compounds	No	2	C
173	Alhambra	1 compounds	No	7	A-
174	La Mesa	1 compounds	No	0	A+
175	Palm Desert	1 compounds	No	12	C+
176	Spring Valley	1 compounds	No	4	B
177	Oxnard	1 compounds	No	49	F
178	Pasadena	1 compounds	No	92	F
179	Santa Rosa	1 compounds	No	177	F
180	Oceanside	1 compounds	No	2	A-
181	Laguna Hills	1 compounds	No	1	B+
182	Rancho Santa Margarita	1 compounds	No	0	A
183	Roseville	1 compounds	No	11	B
184	Placerville	1 compounds	No	6	A-
185	Victorville	1 compounds	No	1	B+
186	Vista	1 compounds	No	0	A-
187	Santa Clara	1 compounds	No	5	B
188	Santa Barbara	1 compounds	No	52	F
189	Davis	1 compounds	No	47	B+
190	San Marcos	1 compounds	No	27	D
191	Costa Mesa	1 compounds	No	2	A-
192	Santa Maria	1 compounds	No	36	F
193	Torrance	1 compounds	No	0	A-
194	Imperial Beach	1 compounds	No	1	A
195	Daly City	1 compounds	No	4	A
196	Walnut	1 compounds	No	1	A-
197	Tracy	1 compounds	No	45	C
198	Santa Cruz	1 compounds	No	38	F
199	Carlsbad	1 compounds	No	0	A+
200	Hemet	1 compounds	No	31	B-
201	Mountain View	1 compounds	No	3	A
202	Calabasas	1 compounds	No	14	A-
203	San Luis Obispo	1 compounds	No	27	F
204	Newport Beach	1 compounds	No	4	B+
205	Citrus Heights	1 compounds	No	2	A
206	Woodland	1 compounds	No	52	F
207	Brentwood	1 compounds	No	91	F
208	Salinas	1 compounds	No	639	F
209	La Habra	1 compounds	No	0	A-
210	Pittsburg	1 compounds	No	0	A
211	Fallbrook	1 compounds	No	3	A
212	Delano	1 compounds	No	67	B
213	Paramount	1 compounds	No	0	A-
214	San Clemente	1 compounds	No	3	A-
215	Lompoc	1 compounds	No	18	C
216	Poway	1 compounds	No	0	A-
217	Los Banos	1 compounds	No	29	B
218	Brea	1 compounds	No	0	A
219	El Centro	1 compounds	No	14	C-
220	Oakley	1 compounds	No	60	D
221	Ridgecrest	1 compounds	No	26	A-
222	San Bruno	1 compounds	No	0	A+
223	Soquel	1 compounds	No	1	A
224	Moorpark	1 compounds	No	1	A-
225	Beverly Hills	1 compounds	No	18	B
226	Calexico	1 compounds	No	7	B-
227	Marina	1 compounds	No	4	A+
228	Ramona	1 compounds	No	36	C
229	Santa Paula	1 compounds	No	5	A-
230	Manhattan Beach	1 compounds	No	1	A-
231	Imperial	1 compounds	No	36	C+
232	Soledad	1 compounds	No	28	C+
233	Vernon	1 compounds	No	3	A
234	Wasco	1 compounds	No	26	B+
235	Brawley	1 compounds	No	5	A-
236	Patterson	1 compounds	No	35	B+
237	Seal Beach	1 compounds	No	0	A-
238	Quartz Hill	1 compounds	No	1	A-
239	Port Hueneme	1 compounds	No	0	B+
240	Cutten	1 compounds	No	5	A+
241	Lamont	1 compounds	No	40	B+
242	Chowchilla	1 compounds	Yes	25	A-
243	Greenfield	1 compounds	No	17	B
244	Twentynine Palms	1 compounds	No	70	B+
245	Rosamond	1 compounds	No	205	F
246	Oak View	1 compounds	No	12	B+
247	Lakeport	1 compounds	No	14	C-
248	Needles	1 compounds	No	45	F
249	Fillmore	1 compounds	No	13	B-
250	Discovery Bay	1 compounds	No	3	A+
251	El Segundo	1 compounds	No	0	A-
252	Blythe	1 compounds	No	143	D
253	Carpinteria	1 compounds	No	5	A
254	La Palma	1 compounds	No	0	A-
255	Fort Irwin	1 compounds	No	60	B+
256	Vandenberg Sfb	1 compounds	No	8	A
257	Westlake Village	1 compounds	No	8	F
258	California City	1 compounds	No	22	A-
259	Susanville	1 compounds	No	34	A-
260	Nipomo	1 compounds	No	1	A
261	Trabuco Canyon	1 compounds	No	2	A-
262	Tahoe City	1 compounds	No	11	B+
263	Dixon	1 compounds	No	2	A
264	El Cajon	1 compounds	No	24	B+
265	Newman	1 compounds	No	3	A-
266	Signal Hill	1 compounds	No	6	B
267	Ojai	1 compounds	No	35	C-
268	Edwards Afb	1 compounds	No	8	A-
269	Colusa	1 compounds	No	6	C-
270	Rio Vista	1 compounds	No	3	A+
271	La Canada Flintridge	1 compounds	No	4	A
272	La Canada	1 compounds	No	5	B
273	Mammoth Lakes	1 compounds	No	24	B
274	Guadalupe	1 compounds	No	0	A
275	Pismo Beach	1 compounds	No	4	A-
276	Firebaugh	1 compounds	No	89	D
277	Corning	1 compounds	No	17	B-
278	Gonzales	1 compounds	No	53	F
279	Santa Ynez	1 compounds	No	14	A-
280	Sebastopol	1 compounds	No	18	B-
281	Orland	1 compounds	No	5	A
282	Castroville	1 compounds	No	86	D+
283	Kirkwood	1 compounds	No	0	A
284	Represa	1 compounds	Yes	1	B
285	Fowler	1 compounds	No	2	A
286	Cotati	1 compounds	No	9	A-
287	Heber	1 compounds	No	15	A
288	Kelseyville	1 compounds	No	36	B-
289	Joshua Tree	1 compounds	No	3	A-
290	China Lake	1 compounds	No	8	A
291	Holtville	1 compounds	No	66	B-
292	St. Helena	1 compounds	No	29	C+
293	Hidden Valley Lake	1 compounds	No	1	A+
294	Gustine	1 compounds	No	4	B+
295	Williams	1 compounds	No	3	A+
296	Arnold	1 compounds	No	2	B-
297	Buellton	1 compounds	No	2	B+
298	Murphys	1 compounds	No	11	B+
299	Mojave	1 compounds	No	114	D
300	San Joaquin	1 compounds	No	13	A
301	Del Mar	1 compounds	No	3	B-
302	Quincy	1 compounds	No	6	A
303	Mariposa	1 compounds	No	71	C
304	Aptos	1 compounds	No	9	A-
305	Borrego Springs	1 compounds	No	2	A+
306	Skyforest	1 compounds	No	0	A-
307	Bolinas	1 compounds	No	49	A-
308	Barstow	1 compounds	No	66	F
309	Sea Ranch	1 compounds	No	4	B
310	Paicines	1 compounds	No	9	B-
311	Burlingame	0 compounds	No	14	A-
312	Fremont	0 compounds	No	3	B-
313	Fontana	0 compounds	No	0	A-
314	Rancho Cucamonga	0 compounds	No	0	B+
315	Concord	0 compounds	No	19	B-
316	Corte Madera	0 compounds	No	0	A-
317	Hayward	0 compounds	No	0	A-
318	Sunnyvale	0 compounds	No	3	A
319	Vallejo	0 compounds	No	6	A
320	Auburn	0 compounds	No	8	A
321	Fairfield	0 compounds	No	7	B-
322	Antioch	0 compounds	No	3	A
323	Chino	0 compounds	No	9	B
324	Simi Valley	0 compounds	No	3	A
325	Redwood City	0 compounds	No	10	B+
326	Madera	0 compounds	No	564	D
327	Napa	0 compounds	No	53	F
328	Folsom	0 compounds	No	1	A-
329	Indio	0 compounds	No	12	F
330	Milpitas	0 compounds	No	2	A-
331	Chino Hills	0 compounds	No	2	A
332	Palm Springs	0 compounds	No	16	B
333	Tulare	0 compounds	No	61	C-
334	Baldwin Park	0 compounds	No	1	A
335	Turlock	0 compounds	No	16	B-
336	Yuba City	0 compounds	No	24	A-
337	Palo Alto	0 compounds	No	8	A-
338	Beaumont	0 compounds	No	2	A-
339	Hanford	0 compounds	No	197	D+
340	Novato	0 compounds	No	3	B+
341	Petaluma	0 compounds	No	2	B
342	Grass Valley	0 compounds	No	8	A
343	West Sacramento	0 compounds	No	1	B+
344	Thousand Oaks	0 compounds	No	1	A
345	Glendora	0 compounds	No	0	A-
346	Desert Hot Springs	0 compounds	No	4	A
347	Coachella	0 compounds	No	11	C-
348	Lemoore	0 compounds	No	112	D
349	Lebec	0 compounds	No	42	C
350	Livermore	0 compounds	No	53	B
351	Pacifica	0 compounds	No	2	A
352	Foster City	0 compounds	No	2	A+
353	Stanford	0 compounds	No	3	A+
354	San Andreas	0 compounds	No	17	B-
355	East Palo Alto	0 compounds	No	8	A
356	La Verne	0 compounds	No	6	B+
357	Martinez	0 compounds	No	0	A
358	Granite Bay	0 compounds	No	43	B-
359	Belmont	0 compounds	No	3	A+
360	Eureka	0 compounds	No	3	A-
361	Oakdale	0 compounds	No	34	C-
362	Olivehurst	0 compounds	No	2	A
363	Reedley	0 compounds	No	12	B-
364	Windsor	0 compounds	No	2	A+
365	South Pasadena	0 compounds	No	5	A
366	Shafter	0 compounds	No	25	A-
367	Mountain House	0 compounds	No	1	A+
368	Riverbank	0 compounds	No	75	D
369	San Fernando	0 compounds	No	1	A+
370	Millbrae	0 compounds	No	1	A-
371	Corcoran	0 compounds	No	3	A
372	Menlo Park	0 compounds	No	2	A-
373	Arcata	0 compounds	No	3	A
374	San Jacinto	0 compounds	No	9	B
375	Marysville	0 compounds	No	11	B+
376	Temescal Valley	0 compounds	No	2	A
377	Anderson	0 compounds	No	14	C-
378	American Canyon	0 compounds	No	15	A-
379	Crescent City	0 compounds	No	14	C
380	Taft	0 compounds	No	0	A-
381	Arvin	0 compounds	No	81	C+
382	Half Moon Bay	0 compounds	No	6	A
383	Mckinleyville	0 compounds	No	2	A-
384	Sausalito	0 compounds	No	4	A+
385	Coalinga	0 compounds	No	267	D
386	Kerman	0 compounds	No	13	B
387	Orangevale	0 compounds	No	0	A
388	Sutter Creek	0 compounds	No	7	B+
389	Cupertino	0 compounds	No	3	A+
390	Moffett Field	0 compounds	No	1	A
391	29 Palms	0 compounds	No	3	B
392	Livingston	0 compounds	No	29	C-
393	Parlier	0 compounds	No	14	A-
394	La Puente	0 compounds	No	1	B+
395	Mcfarland	0 compounds	No	42	C+
396	Morro Bay	0 compounds	No	12	A-
397	Kingsburg	0 compounds	No	17	B
398	Avenal	0 compounds	No	35	B
399	South San Francisco	0 compounds	No	2	A
400	Grover Beach	0 compounds	No	34	F
401	Brooks	0 compounds	No	2	B+
402	Fortuna	0 compounds	No	7	B-
403	Hillsborough	0 compounds	No	7	A
404	King George	0 compounds	No	30	D+
405	Mendota	0 compounds	No	3	A
406	Shingle Springs	0 compounds	No	0	B+
407	Cloverdale	0 compounds	No	9	B
408	Sierra Madre	0 compounds	No	5	A
409	Farmersville	0 compounds	No	20	B+
410	Table Mountain	0 compounds	No	9	A-
411	Shasta Lake 4510007	0 compounds	No	1	A+
412	Willits	0 compounds	No	23	C-
413	Royal Oaks	0 compounds	No	201	D
414	Guerneville	0 compounds	No	3	A
415	Bishop	0 compounds	No	25	D
416	Winton	0 compounds	No	5	A-
417	Pauma Valley	0 compounds	No	88	F
418	Georgetown	0 compounds	No	4	B+
419	Orange Cove	0 compounds	No	10	B+
420	Bermuda Dunes	0 compounds	No	0	A+
421	Forestville	0 compounds	No	14	B-
422	Huron	0 compounds	No	69	B-
423	Paradise	0 compounds	No	2	A
424	Orosi	0 compounds	No	6	A+
425	Lancaster	0 compounds	No	204	D
426	Dinuba	0 compounds	No	24	A-
427	Yreka	0 compounds	No	9	B+
428	Earlimart	0 compounds	No	40	B
429	Fort Bragg	0 compounds	No	4	B
430	Lake Almanor	0 compounds	No	4	A-
431	Woodlake	0 compounds	No	14	A+
432	Oceano	0 compounds	No	1	A
433	Hughson	0 compounds	No	139	D+
434	Dos Palos	0 compounds	No	43	C
435	Escalon	0 compounds	No	13	A
436	Tahoe Vista	0 compounds	No	7	A-
437	Cottonwood	0 compounds	No	7	B
438	Foresthill	0 compounds	No	3	B+
439	Jackson	0 compounds	No	11	A-
440	Beale Afb	0 compounds	No	6	A
441	Los Altos Hills	0 compounds	No	4	A-
442	Cutler	0 compounds	No	20	B
443	Montara	0 compounds	No	3	A-
444	Rancho Murieta	0 compounds	No	3	A
445	Meadow Vista	0 compounds	No	0	A+
446	Keyes	0 compounds	No	60	B+
447	Cambria	0 compounds	No	4	A-
448	Hilmar	0 compounds	No	17	C
449	Denair	0 compounds	No	3	A
450	Visalia	0 compounds	No	121	D+
451	Ivanhoe	0 compounds	No	6	A-
452	Armona	0 compounds	No	71	B+
453	Angels Camp	0 compounds	No	21	B+
454	Yountville	0 compounds	No	4	A-
455	Ione	0 compounds	No	13	A-
456	Mount Shasta	0 compounds	No	11	B+
457	Hoopa	0 compounds	No	16	B+
458	Rio Dell	0 compounds	No	3	A
459	Littlerock	0 compounds	No	0	A
460	Terra Bella	0 compounds	No	26	A-
461	Tipton	0 compounds	No	15	B+
462	Carmel	0 compounds	No	49	C-
463	Blue Lake	0 compounds	No	1	A+
464	Lakehead	0 compounds	No	4	B

FAQ

Frequently asked questions about pfas in California

Does California tap water contain PFAS?

PFAS were detected in 310 of 464 California cities tested under EPA's UCMR 5 program. 124 cities exceed the 2024 EPA MCL of 4 ppt for individual PFAS compounds.

How can I remove PFAS from my drinking water in California?

Reverse osmosis (RO) systems are the most effective at removing PFAS, typically removing 90%+ of compounds. High-quality activated carbon block filters (NSF 58-certified for RO, or NSF 53 for solid carbon) also provide significant reduction. Standard pitcher filters vary widely in PFAS removal.

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