Water hardness in California

Typical California tap water

121mg/L

7.1gpg

Hard

Population-weighted middle value across 557 California cities in the dataset

People with hard or very hard water: 54%
Hardest: Nipomo 604
Softest: La Crescenta-Montrose 3

We have hardness numbers for 515 California cities; 30 of them are county estimates rather than utility figures. Each city page adds the water system's EPA violation record and a softener size for a typical household.

Every California city on the hardness scale

Dot size follows population. Tap a dot for the city page.

137Soft

150Moderately hard

128Hard

100Very hard

Hardest water in California

Softest water in California

All cities in California

City	mg/L	gpg	Class	Data	EPA health violations
Los Angeles	121	7.1	Hard	Utility report	2
San Diego	225	13.2	Very hard	Utility report	0
San Jose	185	10.8	Very hard	Utility report	1
San Francisco	25	1.5	Soft	Utility report	0
Sacramento	45	2.6	Soft	Utility report	0
Long Beach	171	10.0	Hard	County estimate	0
Oakland	34	2.0	Soft	Utility report	0
Bakersfield	34	2.0	Soft	Utility report	0
Anaheim	274	16.0	Very hard	Utility report	0
Riverside	112	6.5	Moderately hard	Utility report	0
Irvine	98	5.8	Moderately hard	Utility report	0
Santa Ana	150	8.8	Hard	Utility report	0
Fremont	65	3.8	Moderately hard	Utility report	0
San Bernardino	79	4.6	Moderately hard	Utility report	0
Fontana	92	5.4	Moderately hard	Utility report	0
Modesto	44	2.6	Soft	Utility report	0
Moreno Valley	122	7.2	Hard	Utility report	0
Oxnard	278	16.3	Very hard	Utility report	0
Huntington Beach	128	7.5	Hard	Utility report	0
Glendale	86	5.0	Moderately hard	Utility report	0
Ontario	104	6.1	Moderately hard	Utility report	0
Elk Grove	50	2.9	Soft	Utility report	1
Santa Rosa	121	7.1	Hard	Utility report	0
Rancho Cucamonga	68	4.0	Moderately hard	Utility report	0
Oceanside	172	10.1	Hard	Utility report	0
Garden Grove	283	16.6	Very hard	Utility report	0
Lancaster	80	4.7	Moderately hard	Utility report	0
Roseville	19	1.1	Soft	Utility report	0
Palmdale	62	3.6	Moderately hard	Utility report	0
Salinas	106	6.2	Moderately hard	Utility report	0
Hayward	44	2.6	Soft	Utility report	0
Sunnyvale	298	17.4	Very hard	Utility report	0
Pomona	138	8.1	Hard	Utility report	0
Visalia	74	4.3	Moderately hard	Utility report	0
Escondido	171	10.0	Hard	Utility report	0
Fullerton	175	10.2	Hard	Utility report	1
Orange	117	6.9	Moderately hard	Utility report	0
Pasadena	230	13.5	Very hard	Utility report	0
Santa Clara	248	14.5	Very hard	Utility report	0
Clovis	59	3.4	Soft	Utility report	0
Simi Valley	181	10.6	Very hard	Utility report	0
Vallejo	82	4.8	Moderately hard	Utility report	0
Concord	86	5.1	Moderately hard	Utility report	0
Fairfield	109	6.4	Moderately hard	Utility report	1
Thousand Oaks	117	6.8	Moderately hard	Utility report	0
Berkeley	34	2.0	Soft	Utility report	0
Antioch	82	4.8	Moderately hard	Utility report	0
Menifee	120	7.0	Moderately hard	Utility report	0
Temecula	139	8.1	Hard	Utility report	0
Richmond	34	2.0	Soft	Utility report	0
East Los Angeles	123	7.2	Hard	Utility report	0
Murrieta	132	7.7	Hard	Utility report	0
Carlsbad	150	8.8	Hard	Utility report	0
Santa Maria	217	12.7	Very hard	Utility report	0
Ventura	400	23.4	Very hard	County estimate	1
Costa Mesa	96	5.6	Moderately hard	Utility report	0
Downey	247	14.4	Very hard	Utility report	1
Jurupa Valley	122	7.2	Hard	Utility report	0
Rialto	89	5.2	Moderately hard	Utility report	0
West Covina	170	10.0	Hard	Utility report	0
Chico	154	9.0	Hard	Utility report	0
El Monte	48	2.8	Soft	Utility report	2
Vacaville	94	5.5	Moderately hard	Utility report	0
San Mateo	35	2.1	Soft	Utility report	0
Burbank	133	7.8	Hard	Utility report	0
Hesperia	108	6.3	Moderately hard	Utility report	0
Tracy	67	3.9	Moderately hard	Utility report	0
El Cajon	165	9.6	Hard	Utility report	0
Inglewood	195	11.4	Very hard	Utility report	0
Daly City	73	4.3	Moderately hard	Utility report	0
Merced	138	8.0	Hard	County estimate	0
Vista	213	12.5	Very hard	Utility report	0
Norwalk	136	7.9	Hard	Utility report	0
Manteca	75	4.4	Moderately hard	Utility report	0
Arden-Arcade	98	5.8	Moderately hard	Utility report	0
San Marcos	178	10.4	Hard	Utility report	0
Indio	100	5.9	Moderately hard	Utility report	0
Redding	32	1.8	Soft	Utility report	0
Hemet	120	7.0	Moderately hard	Utility report	0
Folsom	18	1.1	Soft	Utility report	0
Mission Viejo	159	9.3	Hard	Utility report	0
Santa Monica	57	3.4	Soft	Utility report	0
South Gate	217	12.7	Very hard	Utility report	0
Westminster	267	15.6	Very hard	County estimate	0
Rancho Cordova	28	1.6	Soft	Utility report	0
Santa Barbara	255	14.9	Very hard	Utility report	0
Citrus Heights	82	4.8	Moderately hard	Utility report	0
San Ramon	44	2.6	Soft	Utility report	0
Mountain View	134	7.9	Hard	Utility report	0
San Leandro	34	2.0	Soft	Utility report	0
Livermore	94	5.5	Moderately hard	Utility report	0
Perris	120	7.0	Moderately hard	Utility report	0
Hawthorne	189	11.0	Very hard	Utility report	0
Redwood City	32	1.9	Soft	Utility report	0
Newport Beach	102	6.0	Moderately hard	Utility report	0
Buena Park	154	9.0	Hard	Utility report	0
Alhambra	137	8.0	Hard	Utility report	0
Upland	126	7.4	Hard	Utility report	0
Milpitas	49	2.9	Soft	Utility report	0
Carmichael	74	4.3	Moderately hard	Utility report	0
Lakewood	177	10.3	Hard	Utility report	0
Pittsburg	82	4.8	Moderately hard	Utility report	0
Chino Hills	81	4.8	Moderately hard	Utility report	0
Alameda	34	2.0	Soft	Utility report	0
Rocklin	11	0.7	Soft	Utility report	0
Napa	54	3.2	Soft	Utility report	1
Apple Valley	205	12.0	Very hard	Utility report	1
Lake Elsinore	111	6.5	Moderately hard	Utility report	0
Bellflower	119	7.0	Moderately hard	Utility report	0
Pleasanton	161	9.4	Hard	Utility report	0
Redlands	111	6.5	Moderately hard	Utility report	0
Tulare	37	2.2	Soft	Utility report	0
Turlock	98	5.8	Moderately hard	Utility report	1
Eastvale	114	6.7	Moderately hard	Utility report	0
Walnut Creek	40	2.4	Soft	Utility report	0
Yuba City	247	14.4	Very hard	County estimate	0
Lodi	4	0.2	Soft	Calculated from utility data	0
Madera	94	5.5	Moderately hard	County estimate	0
Camarillo	218	12.7	Very hard	Utility report	0
Palo Alto	29	1.7	Soft	Utility report	0
Redondo Beach	198	11.6	Very hard	Utility report	0
Brentwood	86	5.1	Moderately hard	Utility report	0
Davis	68	4.0	Moderately hard	Utility report	0
Yorba Linda	48	2.8	Soft	Calculated from utility data	0
Castro Valley	34	2.0	Soft	Utility report	0
Union City	65	3.8	Moderately hard	Utility report	0
South San Francisco	64	3.8	Moderately hard	Utility report	0
Laguna Niguel	151	8.8	Hard	Utility report	0
Lynwood	171	10.0	Hard	County estimate	0
Porterville	233	13.6	Very hard	Utility report	0
Woodland	44	2.6	Soft	Utility report	0
Hanford	11	0.6	Soft	Utility report	4
San Clemente	168	9.8	Hard	Utility report	0
Santa Cruz	147	8.6	Hard	Utility report	0
Florence-Graham	121	7.1	Hard	Utility report	2
La Habra	168	9.8	Hard	Utility report	0
Beaumont	123	7.2	Hard	Utility report	0
Gilroy	113	6.6	Moderately hard	Utility report	1
Encinitas	157	9.2	Hard	Utility report	0
La Mesa	150	8.8	Hard	Utility report	0
Petaluma	105	6.1	Moderately hard	Utility report	0
San Rafael	56	3.3	Soft	Utility report	0
Pico Rivera	45	2.6	Soft	Utility report	0
Gardena	185	10.8	Very hard	Utility report	0
Cupertino	186	10.9	Very hard	Utility report	0
Santee	160	9.4	Hard	Utility report	0
National City	128	7.5	Hard	Utility report	0
Highland	123	7.2	Hard	Utility report	0
Lincoln	15	0.9	Soft	Utility report	0
West Sacramento	35	2.0	Soft	Utility report	1
San Jacinto	120	7.0	Moderately hard	Utility report	0
Fountain Valley	125	7.3	Hard	Utility report	0
South Whittier	174	10.2	Hard	Utility report	0
Hacienda Heights	117	6.8	Moderately hard	Utility report	2
Yucaipa	108	6.3	Moderately hard	Utility report	0
Arcadia	54	3.2	Soft	Utility report	0
Colton	139	8.1	Hard	Utility report	0
Palm Desert	113	6.6	Moderately hard	Utility report	0
Cathedral City	138	8.1	Hard	Utility report	0
Delano	181	10.6	Very hard	County estimate	0
Novato	63	3.7	Moderately hard	Utility report	0
Diamond Bar	153	8.9	Hard	Utility report	0
Huntington Park	171	10.0	Hard	County estimate	0
Paramount	108	6.3	Moderately hard	Utility report	0
Watsonville	215	12.6	Very hard	Utility report	0
San Luis Obispo	216	12.6	Very hard	Utility report	0
El Dorado Hills	14	0.8	Soft	Utility report	0
Aliso Viejo	160	9.3	Hard	Utility report	0
Glendora	122	7.2	Hard	Utility report	0
Los Banos	138	8.0	Hard	County estimate	1
Florin	66	3.9	Moderately hard	Utility report	0
Rosemead	46	2.7	Soft	Utility report	2
Covina	167	9.8	Hard	Utility report	0
Poway	194	11.3	Very hard	Utility report	0
Antelope	90	5.3	Moderately hard	Utility report	0
Ceres	66	3.9	Moderately hard	Utility report	1
Cypress	196	11.5	Very hard	Utility report	0
North Highlands	98	5.7	Moderately hard	Utility report	0
Newark	65	3.8	Moderately hard	Utility report	0
Oakley	89	5.2	Moderately hard	Utility report	0
Azusa	116	6.8	Moderately hard	Utility report	0
Brea	191	11.2	Very hard	Utility report	0
Rowland Heights	160	9.4	Hard	Utility report	0
Cerritos	135	7.9	Hard	Utility report	0
La Mirada	174	10.2	Hard	Utility report	0
Rancho Santa Margarita	157	9.2	Hard	Utility report	0
Morgan Hill	49	2.9	Soft	Utility report	0
Coachella	99	5.8	Moderately hard	Utility report	0
Palm Springs	138	8.1	Hard	Utility report	0
Rohnert Park	106	6.2	Moderately hard	Utility report	0
El Centro	150	8.8	Hard	County estimate	0
Danville	34	2.0	Soft	Utility report	0
Vineyard	53	3.1	Soft	Utility report	1
French Valley	120	7.0	Moderately hard	Utility report	0
Campbell	178	10.4	Hard	Utility report	1
San Bruno	44	2.6	Soft	Utility report	0
Altadena	234	13.7	Very hard	Utility report	0
Stanton	196	11.5	Very hard	Utility report	0
Rancho Palos Verdes	171	10.0	Hard	County estimate	–
Culver City	122	7.1	Hard	Utility report	2
La Quinta	113	6.6	Moderately hard	Utility report	0
Adelanto	111	6.5	Moderately hard	County estimate	0
Calexico	174	10.2	Hard	Utility report	2
Monrovia	135	7.9	Hard	Utility report	0
San Gabriel	116	6.8	Moderately hard	Utility report	0
Wildomar	111	6.5	Moderately hard	Utility report	0
Montclair	166	9.7	Hard	Utility report	0
Bell Gardens	171	10.0	Hard	County estimate	0
Foothill Farms	92	5.4	Moderately hard	Utility report	0
Pacifica	70	4.1	Moderately hard	Utility report	0
Martinez	84	4.9	Moderately hard	Utility report	0
La Presa	189	11.1	Very hard	Utility report	0
Claremont	157	9.2	Hard	Utility report	0
Orangevale	45	2.6	Soft	Utility report	0
Temple City	113	6.6	Moderately hard	Utility report	0
San Juan Capistrano	158	9.2	Hard	Utility report	0
Moorpark	190	11.1	Very hard	Utility report	0
Westmont	185	10.8	Very hard	Utility report	0
West Hollywood	121	7.1	Hard	Utility report	2
Pleasant Hill	40	2.4	Soft	Utility report	0
Desert Hot Springs	213	12.5	Very hard	Utility report	0
Manhattan Beach	215	12.6	Very hard	Utility report	0
San Dimas	275	16.1	Very hard	Utility report	0
Menlo Park	46	2.7	Soft	Utility report	0
Los Gatos	178	10.4	Hard	Utility report	1
Fallbrook	119	6.9	Moderately hard	Utility report	0
Foster City	33	1.9	Soft	Utility report	0
Goleta	294	17.2	Very hard	Utility report	0
Spring Valley	189	11.1	Very hard	Utility report	0
Atwater	138	8.0	Hard	County estimate	0
Fair Oaks	53	3.1	Soft	Utility report	0
Burlingame	31	1.8	Soft	Utility report	0
Banning	186	10.9	Very hard	County estimate	0
Santa Paula	383	22.4	Very hard	Utility report	0
San Pablo	34	2.0	Soft	Utility report	0
Seaside	160	9.3	Hard	Utility report	0
Orcutt	233	13.6	Very hard	Utility report	0
Los Altos	298	17.4	Very hard	Utility report	0
Beverly Hills	121	7.1	Hard	Utility report	0
Saratoga	178	10.4	Hard	Utility report	1
La Verne	231	13.5	Very hard	Utility report	1
Laguna Hills	160	9.3	Hard	Utility report	0
Lawndale	188	11.0	Very hard	Utility report	0
Atascadero	39	2.3	Soft	Calculated from utility data	–
Suisun City	107	6.3	Moderately hard	Utility report	11
San Lorenzo	33	1.9	Soft	Utility report	0
Eastern Goleta Valley	292	17.1	Very hard	Utility report	0
San Carlos	33	1.9	Soft	Utility report	0
Monterey	160	9.3	Hard	Utility report	0
Belmont	37	2.2	Soft	Utility report	0
Brawley	150	8.8	Hard	County estimate	0
Lemon Grove	150	8.8	Hard	Utility report	0
Walnut	210	12.3	Very hard	Utility report	0
Lemoore	26	1.5	Soft	Utility report	39
Sanger	202	11.8	Very hard	County estimate	1
Reedley	202	11.8	Very hard	County estimate	0
Galt	67	3.9	Moderately hard	County estimate	0
Patterson	471	27.5	Very hard	County estimate	0
Riverbank	196	11.5	Very hard	Utility report	1
Wasco	181	10.6	Very hard	County estimate	0
Benicia	56	3.3	Soft	Utility report	0
Soledad	227	13.3	Very hard	County estimate	0
Hercules	34	2.0	Soft	Utility report	0
El Cerrito	51	3.0	Soft	Utility report	0
North Tustin	243	14.2	Very hard	Utility report	0
Dinuba	92	5.3	Moderately hard	Utility report	1
Twentynine Palms	111	6.5	Moderately hard	County estimate	0
Windsor	120	7.0	Moderately hard	County estimate	0
South Pasadena	128	7.5	Hard	Utility report	0
West Whittier-Los Nietos	75	4.4	Moderately hard	Utility report	2
Mountain House	61	3.5	Moderately hard	Utility report	0
Lafayette	34	2.0	Soft	Utility report	0
Eureka	78	4.6	Moderately hard	Utility report	0
Loma Linda	99	5.8	Moderately hard	Utility report	0
Imperial Beach	200	11.7	Very hard	Utility report	1
Norco	99	5.8	Moderately hard	Utility report	1
Barstow	80	4.7	Moderately hard	Utility report	0
Selma	202	11.8	Very hard	County estimate	–
Bloomington	96	5.6	Moderately hard	Utility report	0
Seal Beach	169	9.9	Hard	Utility report	0
Bay Point	88	5.2	Moderately hard	Utility report	0
Shafter	181	10.6	Very hard	County estimate	0
Ladera Ranch	158	9.2	Hard	Utility report	0
Maywood	171	10.0	Hard	County estimate	–
East San Gabriel	192	11.2	Very hard	Utility report	0
San Fernando	121	7.1	Hard	Utility report	0
Rosemont	38	2.2	Soft	Utility report	0
Marina	142	8.3	Hard	Utility report	0
Oakdale	94	5.5	Moderately hard	Utility report	1
Millbrae	44	2.6	Soft	Utility report	0
Duarte	75	4.4	Moderately hard	Utility report	0
Ramona	85	5.0	Moderately hard	Utility report	0
Ashland	33	1.9	Soft	Utility report	0
American Canyon	65	3.8	Moderately hard	Utility report	9
West Rancho Dominguez	185	10.8	Very hard	Utility report	0
Laguna Beach	98	5.7	Moderately hard	Utility report	0
Corcoran	64	3.8	Moderately hard	County estimate	0
Imperial	94	5.5	Moderately hard	Utility report	8
Rancho San Diego	212	12.4	Very hard	Utility report	0
West Puente Valley	109	6.4	Moderately hard	Utility report	2
Calabasas	77	4.5	Moderately hard	Utility report	0
Winter Gardens	150	8.8	Hard	Utility report	0
West Carson	119	6.9	Moderately hard	Utility report	2
Yucca Valley	110	6.4	Moderately hard	Utility report	0
Lakeside	164	9.6	Hard	Utility report	0
Willowbrook	121	7.1	Hard	Utility report	2
Valinda	223	13.0	Very hard	Utility report	0
Granite Bay	13	0.8	Soft	Utility report	0
Stevenson Ranch	236	13.8	Very hard	Utility report	0
Greenfield	227	13.3	Very hard	County estimate	0
Dixon	152	8.9	Hard	Utility report	0
South Lake Tahoe	45	2.6	Soft	Calculated from utility data	–
Coronado	160	9.4	Hard	Utility report	0
Port Hueneme	278	16.3	Very hard	Utility report	0
Rosamond	103	6.0	Moderately hard	Utility report	0
Oroville	24	1.4	Soft	Utility report	0
East Hemet	120	7.0	Moderately hard	Utility report	0
Lennox	185	10.8	Very hard	Utility report	0
La Crescenta-Montrose	3	0.2	Soft	Utility report	0
Lomita	121	7.1	Hard	Utility report	1
Casa de Oro-Mount Helix	212	12.4	Very hard	Utility report	0
Mead Valley	122	7.2	Hard	Utility report	0
Orinda	34	2.0	Soft	Utility report	0
La CaÃ±ada Flintridge	218	12.8	Very hard	Utility report	0
Valle Vista	120	7.0	Moderately hard	Utility report	0
Agoura Hills	88	5.2	Moderately hard	Utility report	0
Albany	34	2.0	Soft	Utility report	0
South El Monte	34	2.0	Soft	Utility report	2
Santa Fe Springs	61	3.6	Moderately hard	Utility report	0
Pinole	34	2.0	Soft	Utility report	0
Hermosa Beach	198	11.6	Very hard	Utility report	0
Castaic	236	13.8	Very hard	Utility report	0
Stanford	146	8.5	Hard	Utility report	0
Rancho Mirage	138	8.1	Hard	Utility report	0
South San Jose Hills	208	12.2	Very hard	Utility report	0
Cameron Park	14	0.8	Soft	Utility report	0
Coalinga	118	6.9	Moderately hard	Utility report	0
Nipomo	604	35.3	Very hard	Utility report	0
McKinleyville	91	5.3	Moderately hard	Utility report	0
Woodcrest	99	5.8	Moderately hard	Utility report	0
Rio Linda	93	5.5	Moderately hard	Utility report	0
Fillmore	77	4.5	Moderately hard	Utility report	2
Clearlake	96	5.6	Moderately hard	Utility report	4
Live Oak	147	8.6	Hard	Utility report	0
Laguna Woods	108	6.3	Moderately hard	Utility report	0
Bostonia	165	9.6	Hard	Utility report	0
El Segundo	172	10.1	Hard	Utility report	0
Moraga	34	2.0	Soft	Utility report	0
Ripon	28	1.6	Soft	Utility report	0
Ukiah	55	3.2	Soft	Utility report	0
Parkway	66	3.9	Moderately hard	Utility report	0
El Sobrante	48	2.8	Soft	Utility report	0
Artesia	126	7.3	Hard	Utility report	0
Alpine	209	12.2	Very hard	Utility report	0
Coto de Caza	158	9.2	Hard	Utility report	0
Discovery Bay	137	8.0	Hard	Utility report	0
Vincent	112	6.5	Moderately hard	Utility report	0
Camp Pendleton South	117	6.8	Moderately hard	Utility report	4
Lemon Hill	25	1.5	Soft	Utility report	0
La Palma	177	10.4	Hard	Utility report	0
McFarland	5	0.3	Soft	Utility report	7
Pacific Grove	169	9.9	Hard	Utility report	0
Cherryland	33	1.9	Soft	Utility report	0
Salida	44	2.6	Soft	Utility report	0
Alamo	34	2.0	Soft	Utility report	0
Grass Valley	13	0.7	Soft	Utility report	0
Auburn	11	0.6	Soft	Utility report	0
North Auburn	12	0.7	Soft	Utility report	0
Mill Valley	56	3.3	Soft	Utility report	0
Isla Vista	294	17.2	Very hard	Utility report	0
Oak Park	138	8.1	Hard	Utility report	0
North Fair Oaks	32	1.9	Soft	Utility report	0
California City	73	4.3	Moderately hard	Utility report	0
Emeryville	34	2.0	Soft	Utility report	0
Kingsburg	91	5.3	Moderately hard	Utility report	0
Grand Terrace	137	8.0	Hard	Utility report	0
Avocado Heights	34	2.0	Soft	Utility report	2
Mendota	17	1.0	Soft	Utility report	0
Marysville	98	5.7	Moderately hard	Utility report	0
Diamond Springs	14	0.8	Soft	Utility report	0
Larkspur	56	3.3	Soft	Utility report	0
Solana Beach	143	8.4	Hard	Utility report	0
Lindsay	303	17.7	Very hard	Utility report	20
San Anselmo	56	3.3	Soft	Utility report	0
Big Bear City	161	9.4	Hard	Utility report	0
Tamalpais-Homestead Valley	56	3.3	Soft	Utility report	0
San Marino	116	6.8	Moderately hard	Utility report	0
Rossmoor	196	11.5	Very hard	Utility report	0
Tehachapi	363	21.2	Very hard	Utility report	0
View Park-Windsor Hills	122	7.1	Hard	Utility report	2
Los Alamitos	196	11.5	Very hard	Utility report	0
Commerce	75	4.4	Moderately hard	Utility report	0
Scotts Valley	148	8.7	Hard	Utility report	0
University of California-Santa Barbara	294	17.2	Very hard	Utility report	0
Alum Rock	178	10.4	Hard	Utility report	1
Lakeland Village	111	6.5	Moderately hard	Utility report	0
La Riviera	85	5.0	Moderately hard	Utility report	0
Home Gardens	99	5.8	Moderately hard	Utility report	0
Muscoy	72	4.2	Moderately hard	Utility report	0
Rancho Mission Viejo	158	9.2	Hard	Utility report	0
Half Moon Bay	46	2.7	Soft	Utility report	0
Hillsborough	36	2.1	Soft	Utility report	0
Healdsburg	93	5.5	Moderately hard	Utility report	0
Anderson	98	5.7	Moderately hard	Utility report	1
Del Aire	185	10.8	Very hard	Utility report	0
Canyon Lake	118	6.9	Moderately hard	Utility report	0
Quartz Hill	226	13.2	Very hard	Utility report	0
Clayton	86	5.1	Moderately hard	Utility report	0
Citrus	112	6.5	Moderately hard	Utility report	0
Lake Arrowhead	56	3.3	Soft	Utility report	0
Soquel	132	7.7	Hard	Utility report	0
Placerville	14	0.8	Soft	Utility report	0
Piedmont	34	2.0	Soft	Utility report	0
Potomac Park	37	2.2	Soft	Utility report	0
Sierra Madre	161	9.4	Hard	Utility report	0
Morro Bay	149	8.7	Hard	Utility report	0
Sonoma	84	4.9	Moderately hard	Utility report	0
Rio Vista	49	2.9	Soft	Utility report	0
Crestline	51	3.0	Soft	Utility report	0
Blackhawk	34	2.0	Soft	Utility report	0
East Bakersfield	37	2.2	Soft	Utility report	0
Valley Center	223	13.0	Very hard	Utility report	0
Shasta Lake	30	1.7	Soft	Utility report	0
Hillcrest	37	2.2	Soft	Utility report	0
San Diego Country Estates	85	5.0	Moderately hard	Utility report	0
East Whittier	174	10.2	Hard	Utility report	0
Fairview	33	1.9	Soft	Utility report	0
Country Club	10	0.6	Soft	Calculated from utility data	–
Corte Madera	56	3.3	Soft	Utility report	0
Camp Pendleton Mainside	117	6.8	Moderately hard	Utility report	4
Madera Acres	62	3.6	Moderately hard	Utility report	0
Mentone	111	6.5	Moderately hard	Utility report	0
Charter Oak	275	16.1	Very hard	Utility report	0
Capitola	132	7.7	Hard	Utility report	0
Waterford	16	1.0	Soft	Utility report	0
West Athens	185	10.8	Very hard	Utility report	0
Rio del Mar	98	5.8	Moderately hard	Utility report	0
Tiburon	56	3.3	Soft	Utility report	0
Marina del Rey	121	7.1	Hard	Utility report	2
Fort Irwin	24	1.4	Soft	Utility report	4
Topanga	77	4.5	Moderately hard	Utility report	0
Firebaugh	121	7.1	Hard	Utility report	0
Rodeo	34	2.0	Soft	Utility report	0
Orosi	170	9.9	Hard	Utility report	0
East Foothills	178	10.4	Hard	Utility report	1
La Cresta	37	2.2	Soft	Utility report	0
Plumas Lake	197	11.5	Very hard	Utility report	1
Los Altos Hills	274	16.1	Very hard	Utility report	0
Orland	356	20.8	Very hard	Utility report	0
Good Hope	120	7.0	Moderately hard	Utility report	0
Alondra Park	185	10.8	Very hard	Utility report	0
Interlaken	215	12.6	Very hard	Utility report	0
University of California-Davis	212	12.4	Very hard	Utility report	0
South San Gabriel	34	2.0	Soft	Utility report	2
Bermuda Dunes	113	6.6	Moderately hard	Utility report	0
Pismo Beach	149	8.7	Hard	Utility report	3
Thousand Palms	113	6.6	Moderately hard	Utility report	0
Gold River	30	1.8	Soft	Calculated from utility data	–
Sebastopol	142	8.3	Hard	Utility report	0
Westlake Village	88	5.2	Moderately hard	Utility report	0
Ojai	228	13.4	Very hard	Utility report	0
Fairfax	56	3.3	Soft	Utility report	0
Escalon	28	1.6	Soft	Utility report	0
Cotati	106	6.2	Moderately hard	Utility report	0
Heber	53	3.1	Soft	Utility report	7
Mira Monte	197	11.5	Very hard	Utility report	1
Ladera Heights	122	7.2	Hard	Utility report	2
Cottonwood	37	2.2	Soft	Utility report	2
Highgrove	99	5.8	Moderately hard	Utility report	0
Kentfield	56	3.3	Soft	Utility report	0
Contra Costa Centre	40	2.4	Soft	Utility report	0
South Monrovia Island	75	4.4	Moderately hard	Utility report	0
Mecca	113	6.6	Moderately hard	Utility report	0
Alta Sierra	16	0.9	Soft	Utility report	0
Boyes Hot Springs	62	3.6	Moderately hard	Utility report	0
Sausalito	56	3.3	Soft	Utility report	0
Loomis	11	0.7	Soft	Utility report	0
Garnet	213	12.5	Very hard	Utility report	0
Joshua Tree	70	4.1	Moderately hard	Utility report	0
Lake Mathews	140	8.2	Hard	Utility report	0
Nuevo	120	7.0	Hard	Utility report	5
Rancho Calaveras	54	3.2	Soft	Utility report	0
Jamul	289	16.9	Very hard	Utility report	0
Desert Palms	113	6.6	Moderately hard	Utility report	0
Colusa	33	1.9	Soft	Utility report	0
Camino Tassajara	34	2.0	Soft	Utility report	0
El Rio	278	16.3	Very hard	Utility report	0
Lucas Valley-Marinwood	63	3.7	Moderately hard	Utility report	0
Aptos	98	5.8	Moderately hard	Utility report	0
Durham	154	9.0	Hard	Utility report	0
Homeland	120	7.0	Moderately hard	Utility report	0
Las Flores	158	9.2	Hard	Utility report	0
Oak View	186	10.9	Very hard	Utility report	1
Eucalyptus Hills	194	11.3	Very hard	Utility report	0
Lucerne Valley	53	3.1	Soft	Utility report	1
Lemoore Station	100	5.8	Moderately hard	Utility report	2
Pleasure Point	132	7.7	Hard	Utility report	0
Bear Valley Springs	158	9.2	Hard	Utility report	1
Saranap	34	2.0	Soft	Utility report	0
Benton Park	37	2.2	Soft	Utility report	0
Fruitridge Pocket	25	1.5	Soft	Utility report	0
Villa Park	252	14.7	Very hard	Utility report	0
West Modesto	44	2.6	Soft	Utility report	0
East Pasadena	192	11.2	Very hard	Utility report	0
Strawberry	56	3.3	Soft	Utility report	0
Mayflower Village	135	7.9	Hard	Utility report	0
Kensington	34	2.0	Soft	Utility report	0
El Granada	46	2.7	Soft	Utility report	0
Woodside	32	1.9	Soft	Utility report	0
Mayfair	10	0.6	Soft	Calculated from utility data	–
Denair	118	6.9	Moderately hard	Utility report	0
Running Springs	36	2.1	Soft	Utility report	0
Myrtletown	78	4.6	Moderately hard	Utility report	0
Big Bear Lake	173	10.1	Hard	Utility report	0
Sunnyside	167	9.8	Hard	Utility report	1

Questions

Is California water hard?

The typical California resident gets about 121 mg/L (7.1 gpg), which is hard. About 54% of people in the cities we track have hard or very hard water.

Which city in California has the hardest water?

Among 515 cities with pages here, Nipomo is highest at 604 mg/L.

Which city in California has the softest water?

La Crescenta-Montrose, at 3 mg/L.

Other states

Hardness data: TapWaterData US Water Hardness, CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.