Water Testing Labs in California

Certified drinking water laboratories in California accredited for EPA-regulated contaminant testing, including bacteria, metals, nitrates, and PFAS.

Check your water report first — it’s free. Look up your public water system’s EPA compliance data before scheduling an independent test. Search by ZIP →

41 Certified Labs in California

← All States

Advanced Technology Laboratories

📍 3275/3291 Walnut Ave. & 1418 E.33rd St., Signal Hill, CA 90755

📞 (562) 989-4045 xxt. 285

Visit website →

NELAP certifiedTNI accredited

AGQ USA

📍 2451 Eastman Ave, Suite 1, Oxnard, CA 93030

📞 805-981-2972

Visit website →

NELAP certifiedTNI accredited

Air Technology Laboratories Inc

📍 18501 E Gale Ave Ste 130, City of Industry, CA 91748

📞 (626) 964-4032

Visit website →

NELAP certifiedTNI accredited

ALS Environmental - Irvine

📍 3337 Michelson Dr. Suite CN750, Irvine, CA 92612

📞 (714) 306-6239

Visit website →

NELAP certifiedTNI accredited

ALS Environmental - Simi Valley

📍 2655 Park Center Drive, Suite A, Simi Valley, CA 93065

📞 (281) 219-9749

Visit website →

NELAP certifiedTNI accredited

American Analytics Inc.

📍 9765 Eton Avenue, Chatsworth, CA 91311

📞 (818) 998-5547 x 327

Visit website →

NELAP certifiedTNI accredited

Atmospheric Analysis and Consulting, Inc.

📍 2225 Sperry Ave., Ventura, CA 93003

📞 8056501642

Visit website →

NELAP certifiedTNI accredited

Babcock Laboratories, Inc.

📍 6100 Quail Valley Court, Riverside, CA 92507

📞 (951) 653-3351

Visit website →

NELAP certifiedTNI accredited

BLUETRITON BRANDS NATIONAL QUALITY LABORATORY

📍 1544 E WASHINGTON BLVD, BLDG 2, LOS ANGELES, CA 90021

📞 (213) 763-1350

Visit website →

NELAP certifiedTNI accredited

BSK Associates

📍 687 North Laverne Avenue, Fresno, CA 93727

📞 (559) 497-2888

Visit website →

NELAP certifiedTNI accredited

BSK-San Bernardino

📍 350 E. Commercial Road, Suite 110, San Bernardino, CA 92408

📞 (559) 818-0536

Visit website →

NELAP certifiedTNI accredited

CALTEST ANALYTICAL LABORATORY

📍 1885 N. KELLY RD., NAPA, CA 94558

📞 (707) 258-4000 x20

Visit website →

NELAP certifiedTNI accredited

Ceres Analytical Laboratory, Inc.

📍 4919 Windplay Dr., Suite 1, El Dorado Hills, CA 95762

📞 (916) 932-5011

Visit website →

NELAP certifiedTNI accredited

Continental Water Laboratory

📍 8631 Younger Creek Drive, Sacramento, CA 95828

📞 (916) 379-2323

Visit website →

NELAP certifiedTNI accredited

Drinking Water and Radiation Laboratory

📍 850 Marina Bay Parkway, G164, Richmond, CA 94804-

📞 (510) 620-2911

Visit website →

NELAP certifiedTNI accredited

EMAX Laboratories, Inc.

📍 3051 Fujita St., Torrance, CA 90505-

📞 (310) 618-8889

Visit website →

NELAP certifiedTNI accredited

Enthalpy Analytical LLC

📍 1104 Windfield Way, El Dorado Hills, CA 95762

📞 (916) 673-1520 x 115

Visit website →

NELAP certifiedTNI accredited

Enthalpy Analytical, LLC - Anaheim

📍 2532 E. Cerritos Ave, Anaheim, CA 92806

📞 (714) 771-6900

Visit website →

NELAP certifiedTNI accredited

Enthalpy Analytical, LLC - Orange

📍 931 W. Barkley Ave, Orange, CA 92868

📞 (714) 771-6900

Visit website →

NELAP certifiedTNI accredited

Environmental Analytical Service

📍 173 Cross Street, San Luis Obispo, CA 93401

📞 8057813585

Visit website →

NELAP certifiedTNI accredited

EUROFINS ASCEND CLINICAL, LLC

📍 435 OAKMEAD PARKWAY, SUNNYVALE, CA 94085

📞 (650) 780-5540

Visit website →

NELAP certifiedTNI accredited

Eurofins Calscience

📍 2841 Dow Avenue, Suite 100, Tustin, CA 92780

📞 (714) 895-5494

Visit website →

NELAP certifiedTNI accredited

Eurofins Calscience Irvine

📍 17461 Derian Ave, Suite 100, Irvine, CA 92614

📞 (949) 260-3205

Visit website →

NELAP certifiedTNI accredited

Eurofins Eaton Analytical, LLC - Pomona

📍 941 Corporate Center Drive, Pomona, CA 91768-

📞 (626) 386-1100

Visit website →

NELAP certifiedTNI accredited

Eurofins Environment Testing Northern California, LLC

📍 180 Blue Ravine Road, Ste. B, Folsom, CA 95630

📞 (916) 985-1000 x 833104

Visit website →

NELAP certifiedTNI accredited

Eurofins Sacramento

📍 880 Riverside Parkway, West Sacramento, CA 95605

📞 (916) 373-5600

Visit website →

NELAP certifiedTNI accredited

Frontier Analytical Laboratory

📍 5172 Hillsdale Circle, El Dorado Hills, CA 95762

📞 (916) 934-0900

NELAP certifiedTNI accredited

H&P Mobile Geochemistry Inc

📍 2470 Impala Dr, Carlsbad, CA 92010

📞 (760) 804-9678

Visit website →

NELAP certifiedTNI accredited

IEH - JL Analytical

📍 217 Primo Way, Modesto, CA 95358

📞 209-538-8111

Visit website →

NELAP certifiedTNI accredited

McCampbell Analytical Inc.

📍 1534 Willow Pass Road, PITTSBURG, CA 94565

📞 (925) 252-9262

Visit website →

NELAP certifiedTNI accredited

Nautilus Environmental, Inc

📍 4340 Vandever Avenue, San Diego, CA 92120

📞 (858) 587-7333 x14012

Visit website →

NELAP certifiedTNI accredited

NESTLE WATERS QUALITY ASSURANCE LAB

📍 1544 E WASHINGTON BLVD, LOS ANGELES, CA 90021

📞 2137631350

Visit website →

NELAP certifiedTNI accredited

Oilfield Environmental & Compliance, Inc. (OEC)

📍 307 Roemer Way, Santa Maria, CA 93454

📞 (805) 354-7306

Visit website →

NELAP certifiedTNI accredited

Orange County Sanitation District

📍 10844 Ellis Ave, Fountain Valley, CA 92708-

📞 (714) 593-7497

Visit website →

NELAP certifiedTNI accredited

Pace Analytical National Center for Testing & Innovation - Davis

📍 660 Bercut Drive, Suite C, Sacramento, CA 95811

📞 (615) 739-37

Visit website →

NELAP certifiedTNI accredited

Pace Analytical Services, LLC -- Bakersfield

📍 4100 Atlas Court, Bakersfield, CA 93308

📞 (661) 327-4911

Visit website →

NELAP certifiedTNI accredited

Pacific EcoRisk

📍 2250 Cordelia Road, Fairfield, CA 94534

📞 (707) 207-7766

Visit website →

NELAP certifiedTNI accredited

Pacific EcoRisk

📍 2250 Cordelia Road, Fairfiled, CA 94534

📞 (707-27-7766

Visit website →

NELAP certifiedTNI accredited

SGS North America, Inc. - Clovis

📍 908 North Temperance, Clovis, CA 93611-

📞 (559) 275-2175

Visit website →

NELAP certifiedTNI accredited

Symbio Laboratories US, LLC

📍 8310 Miramar Mall, San Diego, CA 92121

📞 (858) 869-0159

Visit website →

NELAP certifiedTNI accredited

Weck Laboratories, Inc.

📍 14859 Clark Avenue, City of Industry, CA 91745

📞 (626) 531-0343

Visit website →

NELAP certifiedTNI accredited

About California Water Testing Certification

All laboratories listed have been certified by California’s state drinking water program. State-certified labs demonstrate proficiency in testing drinking water for contaminants regulated under the Safe Drinking Water Act. For private well testing, contact a lab directly to discuss the appropriate test panel for your area.

For public water systems, check EPA compliance data free at ClearWater. View California water systems →