privatewelldata / Certified labs
Certified labs
457 labs from 1 official lists. Updated 2026-10-17. Source : California Water Boards – ELAP drinking water accredited laboratories.
Accepts private well samples (listed) Certified lab Public systems only
Well water testing by state
Each state page links to that state’s official certified-lab list and adds lab counts, tests and county well data where we have them.
Los Angeles, California · (323) 254-7700
Jackson, California · (530) 277-2770
Ontario, California · (951) 779-0310
Carson, California · (310) 830-2400
Modesto, California · (510) 979-1979
Fremont, California · (510) 979-1979
Anaheim, California · (562) 860-2201
Kelso, Washington · (360) 577-7222
Houston, Texas · (281) 530-5656
Signal Hill, California · (562) 206-2770
Davis, California · (530) 753-5456
Las Vegas, Nevada · (702) 307-2659
Cerritos, California · (562) 219-7436
Sacramento, California · (702) 882-6303
Chino Hills, California · (909) 393-3330
San Luis Obispo, California · (805) 595-1080
Romulus, Michigan · (734) 629-8161
Signal Hill, California · (562) 989-4045
Fremont, California · (510) 668-6527
Cuyahoga Falls, Ohio · (330) 253-8211
Tustin, California · (714) 832-0064
Petaluma, California · (707) 769-3128
Livermore, California · (707) 769-3128
Elk Grove, California · (707) 769-3128
Signal Hill, California · (424) 267-5032
Vista, California · (760) 536-3352
Ukiah, California · (707) 468-0401
Cerritos, California · (562) 809-8880
La Mesa, California · (619) 668-3214
Midlothian, Virginia · (804) 763-1200
Belleville, Illinois · (618) 222-4055
El Segundo, California · (310) 322-4993
San Diego, California · (619) 871-8505
Palmdale, California · (661) 943-3201
Vista, California · (760) 295-0430
Long Beach, California · (562) 495-9500
Ventura, California · (805) 643-5621
Ventura, California · (805) 650-0546
Arcata, California · (707) 825-2148
Oakland, California · (510) 704-8930
Fresno, California · (559) 497-2888
Bakersfield, California · (661) 327-0671
Sacramento, California · (559) 497-2888
San Bernardino, California · (559) 497-2888
El Centro, California · (951) 653-3351
Riverside, California · (951) 653-3351
Norwell, Massachusetts · (781) 681-5565
Sacramento, California · (916) 550-1048
Big Bear City, California · (909) 584-4018
Morgan Hill, California · (669) 258-5821
Brawley, California · (760) 623-1556
Santa Rosa, California · (707) 544-8807
Burbank, California · (818) 238-3500
Burlingame, California · (510) 660-8174
Rancho Cordova, California · (916) 358-2858
West Sacramento, California · (916) 375-6008
Gilroy, California · (408) 848-3619
Calipatria, California · (760) 348-4000
Rancho Cordova, California · (916) 638-7301
San Jose, California · (408) 367-8314
Napa, California · (707) 258-4000
Camarillo, California · (805) 383-5661
Camarillo, California · (805) 482-8563
Camarillo, California · (805) 248-0402
Ventura, California · (805) 644-1095
Wilmington, North Carolina · (910) 795-0421
Carlsbad, California · (760) 795-3555
Carmel By The Sea, California · (402) 215-7659
Carpinteria, California · (805) 684-7214
Oak View, California · (805) 649-2251
San Francisco, California · (415) 882-1690
Shandon, California · (805) 463-2122
Martinez, California · (925) 335-7751
San Rafael, California · (415) 459-1455
Escalon, California · (209) 847-3800
El Dorado Hills, California · (916) 932-5011
Turlock, California · (209) 664-1100
Kettleman City, California · (559) 386-6138
Richmond, California · (510) 242-1556
Anaheim, California · (714) 765-4556
Antioch, California · (925) 779-7024
Atwater, California · (209) 357-3451
Auburn, California · (530) 889-0624
Bakersfield, California · (661) 326-3258
Beverly Hills, California · (310) 285-2483
Brawley, California · (760) 344-5803
Brentwood, California · (925) 516-6074
Burbank, California · (818) 972-1115
Calexico, California · (760) 768-2167
Chico, California · (530) 894-4302
Davis, California · (530) 747-8290
Paso Robles, California · (805) 237-3865
Eureka, California · (707) 441-4363
Fairfield, California · (707) 437-5386
Fortuna, California · (707) 725-1473
Fresno, California · (559) 621-5160
Hayward, California · (510) 293-5176
Healdsburg, California · (707) 473-4486
Livermore, California · (925) 960-8100
Lodi, California · (209) 269-4973
Lompoc, California · (805) 736-1617
Pasadena, California · (213) 367-8523
Los Angeles, California · (323) 226-1658
Manteca, California · (209) 456-8473
Merced, California · (209) 385-6991
Millbrae, California · (650) 259-2388
Modesto, California · (209) 577-6279
Mt. Shasta, California · (530) 926-7535
American Canyon, California · (707) 253-0822
Oceanside, California · (760) 435-5948
Oxnard, California · (805) 271-2207
Pacifica, California · (650) 738-4666
Palm Springs, California · (760) 323-8166
Pasadena, California · (626) 744-7954
Petaluma, California · (707) 778-4591
Porterville, California · (559) 782-7510
Anderson, California · (530) 225-4158
Redlands, California · (909) 798-7506
Riverside, California · (951) 351-6140
Roseville, California · (916) 746-1872
Roseville, California · (916) 746-1872
Sacramento, California · (916) 808-3507
Ventura, California · (805) 677-4130
San Clemente, California · (949) 361-6152
San Diego, California · (619) 758-2361
San Diego, California · (619) 668-3214
San Diego, California · (619) 668-3237
San Diego, California · (619) 758-2338
La Mesa, California · (619) 668-3296
San Leandro, California · (510) 577-6042
San Luis Obispo, California · (805) 781-7242
San Mateo, California · (650) 522-7388
Santa Cruz, California · (831) 420-6045
Santa Cruz, California · (831) 420-5480
Santa Maria, California · (805) 925-0951
Los Angeles, California · (310) 434-2658
Shasta Lake, California · (530) 275-7448
South San Francisco, California · (650) 877-8555
Stockton, California · (209) 937-8786
Sunnyvale, California · (408) 730-7704
Tracy, California · (209) 831-6325
Tulare, California · (559) 684-3124
Turlock, California · (209) 668-5345
Elmira, California · (707) 469-6439
Vallejo, California · (707) 649-3473
Watsonville, California · (831) 768-3179
Woodland, California · (530) 661-2053
Yuba City, California · (530) 822-5397
San Jose, California · (408) 441-0962
Lakeport, California · (707) 295-0333
Lompoc, California · (805) 737-7300
Grand Terrace, California · (909) 825-7693
Clovis, California · (559) 324-3040
Palm Desert, California · (760) 398-2651
Sacramento, California · (916) 379-2323
Concord, California · (925) 688-8091
San Luis Obispo, California · (805) 781-5507
Grass Valley, California · (530) 273-7284
Crescent City, California · (707) 465-5258
Long Beach, California · (562) 432-5445
Rosemont, Illinois · (847) 430-1219
Datalab
CASan Jose, California · (408) 943-1888
Fresno, California · (559) 233-6129
Antioch, California · (925) 756-1900
Palm Springs, California · (760) 323-4971
Pleasanton, California · (925) 875-2325
San Carlos, California · (650) 799-9204
Modesto, California · (209) 341-3234
Lake Elsinore, California · (951) 674-3146
Torrance, California · (310) 618-8889
Phoenix, Arizona · (480) 940-5294
San Leandro, California · (510) 895-3675
Cinnaminson, New Jersey · (800) 220-3675
Carle Place, New York · (516) 997-7251
Saint Louis, Missouri · (856) 858-4800
Indianapolis, Indiana · (317) 803-2997
San Diego, California · (800) 220-3675
Phoenix, Arizona · (602) 276-4344
South Pasadena, California · (323) 254-9960
Oakland, California · (510) 287-1432
Walnut Creek, California · (510) 287-1432
Perris, California · (951) 928-3777
Oak Ridge, Tennessee · (865) 481-0683
City of Industry, California
El Portal, California · (209) 379-1328
Laguna Woods, California · (949) 837-7050
Carlsbad, California · (760) 438-3941
Billings, Montana · (406) 252-6325
Casper, Wyoming · (307) 235-0515
Pomona, California · (909) 590-5905
Orange, California · (714) 937-0750
North Chesterfield, Virginia · (804) 275-4788
San Diego, California · (858) 266-1666
Hayward, California · (510) 670-9901
Playa Del Rey, California · (310) 648-5923
San Pedro, California · (310) 732-4712
Los Angeles, California · (213) 972-1307
Van Nuys, California · (818) 778-4217
Irvine, California · (949) 679-9500
Irvine, California · (949) 322-8335
Escondido, California · (760) 839-6274
Glendale, California · (833) 465-5857
Pomona, California · (623) 298-1015
Folsom, California · (415) 377-0751
Tustin, California · (523) 298-1015
Emeryville, California · (510) 653-0824
Burlingame, California · (623) 298-1015
San Diego, California · (714) 837-5866
Pasadena, Texas · (713) 290-0221
Cary, North Carolina · (919) 481-1413
Arvada, Colorado · (303) 736-0100
Carrollton, Texas · (972) 242-7750
Stafford, Texas · (281) 240-4200
Lancaster, Pennsylvania · (717) 656-2300
Memphis, Tennessee · (901) 213-2447
Tustin, California · (714) 892-0208
Pittsburgh, Pennsylvania · (412) 963-7058
Pomona, California · (626) 386-1100
West Sacramento, California · (916) 373-5600
West Sacramento, California · (626) 386-1221
Tacoma, Washington · (253) 922-2310
South Bend, Indiana · (574) 233-4777
Earth City, Missouri · (314) 298-8566
Tustin, California · (714) 895-5494
Fairfield, California · (707) 429-8930
Fallbrook, California · (760) 728-1125
Cypress, California · (714) 657-7527
Fort Bragg, California · (707) 961-4138
Delhi, California · (209) 394-6914
Chico, California · (530) 343-5818
Stockton, California · (209) 942-0182
Visalia, California · (559) 734-9473
Santa Paula, California · (805) 392-2000
San Luis Obispo, California · (805) 783-2940
Charleston, South Carolina · (843) 556-8171
Burlingame, California · (650) 697-5811
Hesperia, California · (760) 244-3481
Goleta, California · (805) 967-4519
Monterey, California · (831) 624-0947
San Diego, California · (858) 203-8145
Lakeside, California · (619) 667-6248
Camarillo, California · (805) 491-8123
Union, New Jersey · (908) 688-7800
Calipatria, California · (760) 348-2619
Eureka, California · (707) 268-2179
El Centro, California · (442) 265-1427
Chino, California · (909) 993-1600
Modesto, California · (209) 538-8111
Pittsburgh, Pennsylvania · (412) 922-4000
Independence, California · (760) 878-8476
Irvine, California · (949) 453-5474
Rancho Dominguez, California · (714) 707-0612
Gilroy, California · (408) 422-2937
Ramona, California · (760) 789-1330
Santa Fe Springs, California · (714) 449-9937
Santa Rosa, California · (707) 527-7574
Bakersfield, California · (661) 635-1509
Huntington Beach, California · (714) 828-4999
Santa Rosa, California · (707) 543-3363
Lake Arrowhead, California · (909) 336-7168
Thousand Oaks, California · (805) 579-7117
Lancaster, California · (562) 908-4288
San Rafael, California · (415) 472-1734
Calabasas, California · (818) 251-2332
Livermore, California · (925) 423-7348
Lodi, California · (209) 339-1990
Lompoc, California · (805) 875-8406
Long Beach, California · (562) 570-4080
Long Beach, California · (562) 908-4288
Long Beach, California · (562) 570-2482
Downey, California · (562) 658-1300
Los Angeles, California · (213) 367-7481
Cerritos, California · (562) 908-4288
Los Osos, California · (805) 781-5111
Costa Mesa, California · (714) 850-4830
Mammoth Lakes, California · (760) 934-2596
Martinez, California · (925) 372-3006
Corte Madera, California · (415) 945-1552
Moss Landing, California · (831) 771-4175
Mariposa, California · (209) 966-3983
Martinez, California · (925) 313-3111
Pittsburg, California · (925) 252-9262
San Francisco, California · (650) 821-8359
National City, California · (619) 831-8100
Riverside, California · (909) 392-5240
Metropolitan Water District of Southern California - F.E. Weymouth Water Treatment Plant Laboratory
CALa Verne, California · (909) 392-5240
Metropolitan Water District of Southern California - Joseph Jensen Water Treatment Plant Laboratory
CAGranada Hills, California · (909) 392-5240
Yorba Linda, California · (909) 392-5240
La Verne, California · (909) 392-5065
Winchester, California · (909) 392-5240
Commerce, California · (562) 928-0553
Rancho Cordova, California · (916) 567-9808
Arcata, California · (707) 822-4649
Marietta, Ohio · (740) 373-4071
Turlock, California · (707) 822-4649
Waterford, California · (209) 526-7608
Santa Barbara, California · (805) 969-4200
Monterey, California · (831) 375-6227
Salinas, California · (831) 755-4516
Marina, California · (831) 883-6183
Farmers Branch, Texas · (972) 241-8460
Long Beach, California · (562) 726-3365
Fresno, California · (559) 268-7021
Napa, California · (707) 258-6000
Fairfield, California · (707) 784-4410
Ypsilanti, Michigan · (734) 483-8333
San Diego, California · (858) 587-7333
San Diego, California · (619) 553-2788
Oakdale, California · (209) 844-1510
Pacificia, California · (650) 355-3462
Novato, California · (415) 761-8929
Daly City, California · (650) 991-8200
Shafter, California · (661) 399-6411
Novato, California · (415) 892-1694
Monterey Park, California · (323) 720-9775
Santa Maria, California · (805) 922-4772
Ventura, California · (805) 646-5548
Olivehurst, California · (530) 329-2911
El Dorado Hills, California · (916) 673-1520
Orange, California · (714) 771-6900
Wilmington, North Carolina · (910) 212-5856
Anaheim, California · (714) 771-6900
Thousand Oaks, California · (818) 734-6230
Newport Beach, California · (949) 219-0423
Fountain Valley, California · (714) 593-7508
Fountain Valley, California · (714) 378-3339
Oxnard, California · (805) 986-7239
Spring Valley, California · (619) 670-2760
Anderson, California · (530) 782-4291
Las Vegas, Nevada · (615) 703-1123
12065 Lebanon Road, Tennessee · (615) 758-5858
Minneapolis, Minnesota · (612) 607-1700
Mansfield, Massachusetts · (508) 898-9220
Ormond Beach, Florida · (386) 676-4803
Redding, California · (530) 999-4051
West Columbia, South Carolina · (803) 227-2702
Mansfield, Massachusetts · (508) 898-9220
Bakersfield, California · (661) 327-4911
Greensburg, Pennsylvania · (724) 850-5630
Fairfield, California · (707) 207-7760
San Ramon, California · (925) 866-5520
Avila Beach, California · (805) 748-0905
Santee, California · (619) 258-4692
Palmdale, California · (562) 908-4288
Palmdale, California · (661) 947-1178
Palo Alto, California · (650) 617-3169
San Fernando, California · (800) 400-5227
Crescent City, California · (707) 465-1000
Signal Hill, California · (805) 809-1041
Wilmington, California · (310) 952-6128
Pinole, California · (510) 741-3858
Pittsburg, California · (925) 252-6916
San Diego, California · (619) 668-3214
Pomona, California · (562) 908-4288
Los Angeles, California · (213) 745-5312
Stockton, California · (209) 405-0601
Twain Harte, California · (209) 477-8105
Houston, Texas · (713) 680-9425
Rancho Santa Fe, California · (858) 367-7038
Red Bluff, California · (530) 527-1292
Rodeo, California · (510) 799-4411
San Francisco, California · (650) 871-3030
San Francisco, California · (415) 242-2218
Millbrae, California · (650) 871-3030
Moccasin, California · (659) 871-3030
San Francisco, California · (415) 242-2292
San Francisco, California · (650) 871-3030
San Francisco, California · (650) 871-3030
Las Vegas, Nevada · (510) 266-8183
Carson, California · (310) 763-2374
Hayward, California · (510) 266-8183
Scott, Louisiana · (337) 207-1724
Wilmington, North Carolina · (910) 667-0134
Clovis, California · (559) 862-2118
Orlando, Florida · (407) 425-6700
Wheat Ridge, Colorado · (303) 425-6021
Reno, Nevada · (775) 857-2400
Elk Grove, California · (916) 875-9023
Los Angeles, California · (323) 246-2411
Newark, California · (510) 680-7190
San Diego, California · (619) 203-2009
San Diego, California · (858) 503-5371
Cardiff by the Sea, California · (760) 753-6203
Stockton, California · (209) 468-3460
Whittier, California · (562) 908-4288
Los Gatos, California · (408) 761-7142
San Jose, California · (408) 635-4057
Boulder Creek, California · (831) 338-2153
San Luis Obispo, California · (805) 781-5111
San Mateo, California · (650) 573-2500
San Clemente, California · (949) 368-7891
N. Chesterfield, Virginia · (804) 897-1177
San Jose, California · (408) 630-2268
San Jose, California · (408) 630-2268
Santa Clarita, California · (661) 297-1600
Santa Cruz, California · (831) 454-4624
Rancho Mission Viejo, California · (949) 459-6674
Saugus, California · (562) 908-4288
Sausalito, California · (415) 332-8244
Richmond, Virginia · (804) 353-6778
Dallas, Texas · (214) 213-4889
Kingsburg, California · (559) 897-6500
Mill Valley, California · (415) 388-2402
Oroville, California · (530) 534-0353
Laguna Hills, California · (949) 348-9389
Tulare, California · (559) 686-2070
Redwood City, California · (650) 591-7121
Simi Valley, California · (805) 583-6434
Santa Rosa, California · (707) 565-4711
Guerneville, California · (707) 938-3926
Sonoma, California · (707) 938-3926
San Diego, California · (619) 668-3214
Laguna Niguel, California · (949) 234-5444
Oceano, California · (805) 489-6666
South Lake Tahoe, California · (530) 543-6231
Westminster, California · (714) 895-0512
Pico Rivera, California · (562) 806-4280
Sacramento, California · (916) 369-7688
Klamath Falls, Oregon · (541) 882-6286
Signal Hill, California · (562) 426-0199
Lake Forest, California · (949) 297-5020
Spring Valley, California · (619) 409-6813
Sacramento, California · (916) 361-7177
Windsor, Connecticut · (860) 817-5101
Truckee, California · (530) 587-2525
Claremont, California · (909) 621-5568
Torrance, California · (310) 212-4384
Milpitas, California · (408) 263-5258
Windsor, California · (707) 838-1218
Vernon, California · (800) 266-7747
Union City, California · (510) 477-7670
Davis, California · (530) 848-9506
Valencia, California · (562) 908-4288
Benicia, California · (707) 745-7665
San Marcos, California · (760) 744-0460
Vallejo, California · (707) 644-8949
Indio, California · (760) 238-5402
Oxnard, California · (805) 981-5131
Moorpark, California · (805) 378-3015
Bloomington, California · (909) 546-3932
Richmond, California · (510) 412-2001
Vista, California · (760) 597-3143
San Diego, California · (306) 880-4452
San Diego, California · (858) 300-4350
Walnut, California · (909) 595-7554
Santa Barbara, California · (805) 568-1004
Wawona, California · (209) 375-9510
Weaverville, California · (530) 623-6529
City of Industry, California · (626) 336-2139
El Segundo, California · (310) 414-0183
Richmond, California · (510) 237-6603
Chino, California · (909) 627-3628
Las Vegas, Nevada · (705) 355-0202
El Monte, California · (562) 908-4288
Compton, California · (310) 537-7100
Bakersfield, California · (661) 395-0539
Livermore, California · (925) 447-0533
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