Soil and Plant Testing Laboratories in California: A Complete List

Soil and Plant Testing Laboratories in California: A Complete List

 

Need reliable soil analysis, plant tissue testing, or disease diagnostics in California? This directory provides a comprehensive list of agricultural testing laboratories serving Northern, Central, and Southern California. Find contact details, services offered, and locations to meet your specific horticultural and agricultural needs. Last updated: May 9, 2025.

Southern & Central California Soil Testing Laboratories

A&L Laboratory

Phone: 209.529.4080

Address: 1010 Carver Road, Modesto, CA 95350

Services: Plant, soils, compost nutrient testing; no diagnostics

Agbiolab, Inc.

Phone: 530.924.4789

Address: 2692 House Ave, Durham, CA 95938

Services: Plant disease diagnostics, genetic identification

AGQ Labs USA

Phone: 805.981.2972

Address: 2451 Eastman Ave Suite #1, Oxnard CA 93030

Services: Soil/water/plant analysis, food safety testing

ATS Laboratories (Ag Tech Serv)

Phone: 619.344.2532

Address: 106 So.8th St., Brawley, CA 92227

Services: Soil, plant, water NPK tissue analyses

Agri Service (Mary Matava)

Phone: 619.727.5451

Address: 2142 "B" Industrial Ct., Vista, CA 92083

Services: Test citrus and avocado for Phytophthora

Associated Labs (Ed Behare)

Phone: 714.771.6900

Address: 806 N.Batavia, Orange, CA 92668

Services: Plant & soil tests, incl. NPK, heavy metals, ag. suitability

Butler's Mill Lab

Phone: 619.263.6181

Address: 5180 Naranja St., P.O.Box 740069, San Diego, CA

Services: Soil NPK testing

Crop Doctor Lab (Heather Vallier)

Phone: 805.962.0505 or 805.927.7707

Address: 2751 Ernest Place, Cambria, CA 93428

Services: Turf, ornamentals, trees, veg. crops diagnostics

Dellavalle Laboratory, Inc.

Phone: 559.233.6129

Address: 1910 West McKinley Suite 110, Fresno, CA 93728-1298

Services: Plant nutrition and salinity testing of soil, plant material, waters, manures and soil amendments, consultation is available, able to broker samples to other labs to meet most clients' needs

Eurofins STA Laboratories, Inc.

Phone: 408.846.9964

Address: 7240 Holsclaw Rd., Gilroy, CA 95020

Services: Seed health, seed analysis, grapevine testing, molecular markers, IEF hybrid purity, BIOREBA AG products, resistance screening

Fallbrook Ag Lab Inc. (Carolyn Wells)

Phone: 619.728.4828

Address: 433 S. Main St., Fallbrook, CA 92028

Services: Ornamental plant diagnostics

Fruit Growers Lab, Inc.-FGL

Phone: 805.659.0910

Address: P.O. Box 272, Santa Paula, CA 93060

Services: Soil, tissue & compost testing; Phytophthora, nematodes

Gary King, Horticultural Consultant

Phone: 619.941.7409

Address: 1321 Hodges Rd., Oceanside, CA 92056

Services: Agricultural & horticultural crop diagnostics

Orange County Dept. of Agriculture (Richard Tiffer)

Phone: 714.447.7100

Address: 1010 S. Harbor Blvd., Anaheim, CA 92805

Services: Plant disease diagnostics

PACE Turfgrass Research (Larry Stowell)

Phone: 619.272.9897

Address: 1267 Diamond St., San Diego, CA 92109

Services: Turf diagnostics

Pacific Plant Health (Don Ferrin)

Phone: 909.342.0224

Address: 1485 Spruce St., Suite D, Riverside, CA 92507

Services: Plant disease diagnostics

Perry Laboratory

Phone: 408.722.7606

Address: 471 Airport Blvd., Watsonville, CA 95076

Services: Horticultural advising & testing

Plant Disease Diagnosis (Louellen Pierce)

Phone: 510.937.3841

Address: 780 Palmer Rd., Walnut Creek, CA 94596

Services: Turfgrass and plant disease diagnostics

Primus Group, Inc.

Phone: 805.922.0055

Address: 3130 Skyway Dr., Suite 308, Santa Maria, CA 93455

Services: Pesticide residues, microbes, plant tissues, soil and water

San Bernardino County Dept. of Agriculture (Rod Lampman)

Phone: 909.387.2123

Address: 777 E. Rialto Ave., San Bernardino, CA 92415

Services: Plant disease diagnostics

San Diego County Dept. of Agriculture (Pat Nolan)

Phone: 619.694.2753

Address: 5555 Overland Ave. Bldg. #3, San Diego, CA 92123

Services: Plant disease diagnostics

Soil and Plant Laboratory, Inc.

Phone: 714.282.8777

Address: 1594 North Main St., Orange, CA 92867

Services: Diagnostics, soil, plant nutrient analyses

Tree Associates (John Lichter)

Phone: 916.795.1517

Address: 3963 Central Lane, Winters, CA 95694

Services: Tree and landscape problem diagnostics (Northern Sacramento Valley)

Wallace Laboratories

Phone: 800.473.3699

Address: 365 Coral Circle, El Segundo, CA 92045

Services: Plant, soil, compost analyses, no diagnostics

Northern & Central California Soil Testing Laboratories

A & L Western Agricultural Labs

Phone: (209) 529-4080

Fax: (209) 529-4736

Address: 1311 Woodland Ave., Suite 1, Modesto, CA 95351

Website: www.al-labs-west.com

Services: Agricultural testing services.

Agri-Analysis LLC

Phone: (800) 506-9852

Fax: (530) 757-4655

Address: 950 West Chiles Road, Davis, CA 95618

Website: www.agri-analysis.com

Services: Agricultural analysis services.

AL & L Crop Solutions Inc

Phone: (530) 387-3270

Fax: (707) 693-3050

Address: 7769 N. Meridian Rd., Vacaville, CA 95688

Website: www.allcropsolutions.com

Services: Crop solutions and testing.

ALC Consolidated

Phone: (805) 739-5333

Fax: (805) 739-5522

Address: 2255 South Broadway, Suite 12, Santa Maria, CA 93454

Website: www.aglaboratory.com

Services: Agricultural laboratory services.

Basic Lab (Chico)

Phone: (530) 894-8966

Fax: (530) 894-5143

Address: 3860 Morrow Lane, Suite F, Chico, CA 95928

Website: www.basiclab.com

Services: Laboratory services in Chico.

Basic Lab (Redding)

Phone: (530) 243-7234

Fax: (530) 243-7974

Address: 2218 Railroad Ave, Redding, CA 96001

Website: www.basiclab.com

Services: Laboratory services in Redding.

California Laboratory Services

Phone: (800) 638-7301

Address: 3249 Fitzgerald Rd, Rancho Cordova, CA 95742

Website: www.californialab.com

Services: Laboratory services.

Control Laboratories

Phone: (831) 724-5422

Fax: (831) 724-3188

Address: 42 Hangar Way, Watsonville, CA 95076

Website: www.controllabs.com

Services: Control testing laboratory.

Crop Doctor Laboratory

Phone: (805) 927-7707

Address: 1375 E Grand Ave Ste 103-133, Arroyo Grande, CA 93420

Website: www.cropdoctor.net

Services: Crop diagnostics and laboratory services.

CSP Lab (California Seed & Plant)

Phone: (916) 655-1581

Fax: (916) 655-1582

Address: 3556 Sankey Rd, Pleasant Grove, CA 95668

Website: www.csplabs.com

Services: Seed and plant laboratory services.

D & D Agricultural Laboratory, Inc

Phone: (559) 348-1818

Fax: (559) 348-1208

Address: 5750 E. Shields Ave., Suite 104, Fresno, CA 93727

Services: Agricultural laboratory services.

Dellavalle Laboratory, Inc.

Phone: (800) 228-9896

Fax: (559) 268-8174

Address: 1910 W. McKinley, Suite 110, Fresno, CA 93728

Website: www.dellavallelab.com

Services: Comprehensive agricultural testing and consultation.

Denele Analytical, Inc. (Woodland)

Phone: (530) 666-9056

Fax: (530) 666-9058

Address: 40 N. East St, Ste B, Woodland, CA 95776

Website: www.denelelabs.com

Services: Analytical services in Woodland.

Denele Analytical, Inc. (Turlock)

Phone: (209) 634-9055

Fax: (209) 634-9057

Address: 965 S. Kilroy Rd, Turlock, CA 95380

Website: www.denelelabs.com

Services: Analytical services in Turlock.

Environmental Technical Services

Phone: (707) 778-9605

Fax: (707) 778-9612 (Please call)

Address: 975 Transport Way, Suite 2, Petaluma, CA 94954

Services: Environmental technical services.

Fruit Growers Laboratory, Inc. (Chico)

Phone: (530) 343-5818

Fax: (530) 343-3807

Address: 563 East Lindo Ave, Chico, CA 95926

Website: www.fglinc.com

Services: Fruit growers laboratory services in Chico.

Fruit Growers Laboratory, Inc. (Stockton)

Phone: (209) 942-0182

Fax: (209) 942-0423

Address: 2500 Stagecoach Road, Stockton, CA 95215

Website: www.fglinc.com

Services: Fruit growers laboratory services in Stockton.

Fruit Growers Laboratory, Inc. (Visalia)

Phone: (559) 734-9473

Fax: (559) 734-8435

Address: 9415 W. Goshen Avenue, Visalia, CA 93291

Website: www.fglinc.com

Services: Fruit growers laboratory services in Visalia.

Fruit Growers Laboratory, Inc. (San Luis Obispo)

Phone: (805) 783-2940

Fax: (805) 783-2912

Address: 3442 Empresa Drive, Ste D, San Luis Obispo, CA 93401

Website: www.fglinc.com

Services: Fruit growers laboratory services in San Luis Obispo.

IEH EMA Environmental Micro Analysis

Phone: (530) 666-6890

Fax: (530) 666-2987

Address: 460 N. East Street, Woodland, CA 95776

Website: www.emalab.com

Services: Environmental micro analysis services.

IEH JL Analytical Services, Inc

Phone: (209) 538-8111

Address: 217 Primo Way, Modesto, CA 95358

Website: www.iehinc.com

Services: Analytical services.

JM Lord, Inc

Phone: (559) 268-9755

Fax: (559) 486-6504

Address: 4184 N. Knoll Dr., Fresno, CA 93722

Website: www.jmlordinc.com

Services: Agricultural services and products.

Nematodes Inc.

Phone: (559) 891-9073

Fax: (559) 891-9075 (Please call)

Address: 1577 W. Front St., Suite B, Selma, CA 93662

Services: Nematode testing services.

Perry Laboratory

Phone: (831) 722-7606

Fax: (831) 722-5053

Address: 424 Airport Blvd., Watsonville, CA 95076

Website: www.perrylaboratory.com

Services: Horticultural advising & testing.

Plant Disease Diagnosis

Phone: (925) 937-3841

Address: 780 Palmer Road, Walnut Creek, CA 94596

Website: www.pdd.biz

Services: Plant disease diagnostic services.

Precision Agri-Lab

Phone: (559) 661-6386

Fax: (559) 661-6135

Address: 24730 Avenue 13, Madera, CA 93637

Website: www.precisionagrilab.com

Services: Precision agricultural laboratory services.

Sunburst Agri Biotech Solutions

Phone: (209) 667-4442

Address: 677 East Olive Avenue, Turlock, CA 95380

Website: www.sunburstpdcinc.com

Services: Agri biotech solutions.

Sunland Analytical

Phone: (916) 852-8557

Address: 11419 Sunrise Gold Circle #10, Rancho Cordova, CA 95742

Website: www.sunland-analytical.com

Services: Analytical laboratory services.

TriCal Diagnostic

Phone: (408) 612-6729

Address: 8770 Highway 25, Hollister, CA 95023

Website: www.tricaldiagnostics.com

Services: Diagnostic services.

Valley Tech Agricultural Laboratory Services

Phone: (559) 688-5684

Fax: (559) 688-5768

Address: 2120 South K Street, Tulare, CA 93274

Website: www.valleytechaglab.com

Services: Agricultural laboratory services.

VPN Laboratory

Phone: (559) 276-0403

Fax: (559) 272-9363

Address: 3402 W. Holland Ave #101, Fresno, CA 93722

Website: www.pacificagronomics.com/vpnlab.htm

Services: Laboratory services for Pacific Agronomics.

See all articles

Our tests

Have a question? Get in touch.

Understanding Soil Health

Assessing soil health involves looking at physical, chemical, and biological components.

Soil health is a fundamental concept that underpins the success of agriculture, gardening, and land management practices. It refers to the overall well-being and vitality of the soil ecosystem, encompassing physical, chemical, and biological aspects. Understanding soil health is crucial for maintaining sustainable and productive landscapes while also contributing to environmental conservation.

  1. Physical
    The physical properties of soil play a critical role in its health. These properties include soil texture, structure, compaction, and water-holding capacity. Soil texture refers to the proportions of sand, silt, and clay particles in the soil. A balanced texture allows for adequate water drainage and retention, preventing waterlogging and drought stress. Soil structure influences root penetration, aeration, and nutrient movement. Healthy soil structure promotes a friable and well-drained medium for plant growth.
  2. Chemical
    Soil chemistry directly affects nutrient availability and plant growth. Key chemical factors include soil pH, nutrient content, and the presence of contaminants. Soil pH measures the soil's acidity or alkalinity and profoundly influences nutrient uptake by plants. Nutrient content, including macronutrients like nitrogen, phosphorus, and potassium, must be in balance to support healthy plant growth. Monitoring and maintaining proper nutrient levels through fertilization are essential for maximizing crop yields and preventing nutrient deficiencies.
  3. Biological
    The biological component of soil health pertains to the diverse array of microorganisms, insects, and other organisms that inhabit the soil ecosystem. These organisms play crucial roles in nutrient cycling, organic matter decomposition, and disease suppression. Soil microorganisms break down organic matter, releasing nutrients that are subsequently made available to plants. A rich and diverse soil microbiome contributes to enhanced nutrient availability and plant resilience against diseases.

Our Soil Tests

We provide a range of soil tests from basic chemistry, to texture/infiltration rate, all the way to biology.

Order a Soil Test Kit

Basic Soil Health Test

The Basic Soil Health Test is an excellent starting point for understanding your soil's condition. It offers a comprehensive analysis encompassing pH levels, nutrient content, CEC (Cation Exchange Capacity), salts, and organic matter. This budget-friendly test is ideal for identifying potential soil health issues and establishing a solid foundation for further management.

Full Chemistry Test

Our Full Chemistry Test provides a detailed assessment of your soil's quality, guiding you towards healthy and sustainable soil management practices. Through an extensive analysis, we examine macro and micronutrient levels, pH, CEC, organic matter, and salinity. This comprehensive understanding empowers us to create tailored recommendations for soil amendments and treatments, optimized for the specific plants you intend to cultivate. By optimizing your soil's chemistry, you can expect to foster more robust and vibrant plant growth.

Complete Soil Health Test

Uncover a deeper understanding of your soil's health with the Complete Soil Health Test. This comprehensive analysis goes beyond the basics, measuring nutritional factors and examining soil texture. It covers macro and micronutrients, organic matter, pH, CEC, as well as sand, silt, and clay percentages. Additionally, we assess carbon sequestration levels, providing you with a holistic view of your soil's composition. The personalized recommendations derived from this test empower you to make precise adjustments to enhance your soil's health and productivity.

MWELO Soil Management Report

For those navigating California's MWELO guidelines, our MWELO Soil Management Report is an indispensable resource. This report not only ensures compliance but also promotes sustainable and thriving landscapes. It includes comprehensive data such as soil texture, infiltration rate, pH, total soluble salts, sodium content, and organic matter percentage. With amendment recommendations, optionally tailored to specific plant types, and annual maintenance tips, you'll be equipped to create landscapes that are both aesthetically pleasing and environmentally responsible.

Heavy Metals

The Heavy Metals analysis is a vital tool in assessing potential soil contamination. Given the uncertain history of properties, this analysis identifies the presence of heavy metals that might have accumulated due to past activities or nearby industrial sources. With results available in approximately nine business days, you'll gain insights to ensure the safety and health of your soil.

Soil Food Web

Explore the intricate world beneath the surface with our Soil Food Web analysis. By estimating population sizes of essential trophic groups—bacteria, fungi, protozoa, and nematodes—we unveil the microbiological health of your soil. Additionally, we identify specific organisms within these groups, providing insights into the soil's successional level and overall condition. This analysis is applicable to soil, compost, and compost tea samples, offering a holistic perspective on your soil's biological vitality.

Pesticide Screening

The Pesticide Screening can detect hundreds on common pesticides that may have been applied or drifted from nearby sources.

Herbicide Screening

The Herbicide Screening plays an important role in ensuring the safety of your soil and plants. By detecting the presence of herbicide residues, this test can indicated whether a soil has had history of herbicide applications.

See our other tests.

Regenerative Soil Management Practices

Working with nature to improve soil means implementing practices like cover cropping, mulching, and composting.

Cover Cropping

Cover cropping involves planting specific crops during non-growing seasons to cover and protect the soil. These crops enhance soil structure, prevent erosion, suppress weeds, and provide organic matter when incorporated into the soil. Leguminous cover crops also contribute nitrogen fixation, enriching soil fertility naturally. Cover cropping is a sustainable method that improves soil health and biodiversity.

Mulching

Mulching entails covering the soil surface with organic materials like straw, leaves, or wood chips. Mulch conserves soil moisture, moderates temperature fluctuations, suppresses weeds, and prevents soil erosion. As the mulch breaks down, it contributes organic matter, enriching the soil's structure and fertility. Mulching is an effective and easy way to maintain soil health.

Composting

Composting transforms organic waste into nutrient-rich compost. Incorporating compost into the soil enhances its structure, moisture retention, and fertility. Compost also introduces beneficial microorganisms that aid in nutrient cycling and disease suppression. Composting not only reduces waste but also revitalizes soil, making it an essential component of sustainable gardening.

Water Conservation Techniques

Implementing water-efficient practices such as drip irrigation, rainwater harvesting, and utilizing drought-resistant plants minimizes water use and reduces soil erosion. Conserving water in landscapes maintains soil moisture, supports plant growth, and sustains overall soil health. Water conservation techniques are vital for responsible gardening in arid and water-scarce regions.

If you have any questions feel free to get in touch with the Alluvial Soil Lab team at (831) 216-1367 or at info@alluvialsoillab.com

This page was written with the help of AI.

Articles

View all
  • Free (Grant-based) Soil Testing Through NRCS and EQIP

    Free (Grant-based) Soil Testing Through NRCS an...

    The Environmental Quality Incentives Program (EQIP) and the Natural Resources Conservation Service (NRCS) stand as key pillars in fostering soil health and nutrient management practices within agricultural landscapes. While EQIP...

    Free (Grant-based) Soil Testing Through NRCS an...

    The Environmental Quality Incentives Program (EQIP) and the Natural Resources Conservation Service (NRCS) stand as key pillars in fostering soil health and nutrient management practices within agricultural landscapes. While EQIP...

  • The Haney Soil Test: Everything You Should Know

    The Haney Soil Test: Everything You Should Know

    The Haney Soil Test: Revolutionizing Soil Health Assessment for Sustainable Agriculture in 2025 Soil health is the foundation of sustainable agriculture, driving crop productivity and ecosystem resilience. Traditional soil tests,...

    The Haney Soil Test: Everything You Should Know

    The Haney Soil Test: Revolutionizing Soil Health Assessment for Sustainable Agriculture in 2025 Soil health is the foundation of sustainable agriculture, driving crop productivity and ecosystem resilience. Traditional soil tests,...

  • Parasitic Nematodes in California Vineyards and Agriculture

    Parasitic Nematodes in California Vineyards and...

    Soil parasitic nematodes, microscopic roundworms thriving in Anaheim’s diverse soils, are a double-edged sword in agriculture, particularly for Orange County’s vineyards and urban gardens. Found in millions per square yard...

    Parasitic Nematodes in California Vineyards and...

    Soil parasitic nematodes, microscopic roundworms thriving in Anaheim’s diverse soils, are a double-edged sword in agriculture, particularly for Orange County’s vineyards and urban gardens. Found in millions per square yard...

1 3
View all