Drug & Alcohol Testing Near Me - Castro Valley, CA

Accredited Drug Testing provides drug and alcohol testing services at multiple locations throughout your local area.  

Employment, DOT, Court Ordered, Personal
Urine | Hair Follicle | Oral Fluid | Blood | ETG

38 Drug-Testing Centers in Castro Valley

Minutes Away, Test Today

20400 Lake Chabot Rd Ste 101,0.15 miles

20400 Lake Chabot Rd Ste 101,
Castro Valley, CA 94546

24326 Mission Blvd Ste 32.10 miles

24326 Mission Blvd Ste 3
Hayward, CA 94544

13939 E 14th St3.27 miles

13939 E 14th St
San Leandro, CA 94578

27200 Calaroga Ave4.23 miles

27200 Calaroga Ave
Hayward, CA 94545

26250 Industrial Blvd Ste 324.41 miles

26250 Industrial Blvd Ste 32
Hayward, CA 94545

2587 Merced St4.49 miles

2587 Merced St
San Leandro, CA 94577

29000 Hesperian Blvd5.42 miles

29000 Hesperian Blvd
Hayward, CA 94545

1555 Doolittle Dr Ste 1805.50 miles

1555 Doolittle Dr Ste 180
San Leandro, CA 94577

3555 Whipple Rd6.10 miles

3555 Whipple Rd
Union City, CA 94587

7901 Oakport St Ste 4950 2nd Floor7.03 miles

7901 Oakport St Ste 4950 2nd Floor
Oakland, CA 94621

7817 Oakport St7.09 miles

7817 Oakport St
Oakland, CA 94621

401 Roland Way Ste 2057.26 miles

401 Roland Way Ste 205
Oakland, CA 94621

33077 Alvarado Niles Rd7.37 miles

33077 Alvarado Niles Rd
Union City, CA 94587

33560 Alvarado Niles Rd7.63 miles

33560 Alvarado Niles Rd
Union City, CA 94587

7667 Amador Valley Blvd8.40 miles

7667 Amador Valley Blvd
Dublin, CA 94568

5720 Stoneridge Mall Road, Suite 1108.49 miles

5720 Stoneridge Mall Road, Suite 110
Pleasanton, CA 94588

2301 Camino Ramon Ste 1088.69 miles

2301 Camino Ramon Ste 108
San Ramon, CA 94583

7601 Stoneridge Dr Fl 18.81 miles

7601 Stoneridge Dr Fl 1
Pleasanton, CA 94588

6001 Norris Canyon Rd Ste 1428.91 miles

6001 Norris Canyon Rd Ste 142
San Ramon, CA 94583

5601 Norris Canyon Rd Ste 1408.91 miles

5601 Norris Canyon Rd Ste 140
San Ramon, CA 94583

2421 Encinal Ave Ste A9.79 miles

2421 Encinal Ave Ste A
Alameda, CA 94501

4847 Hopyard Rd Ste 4-42410.01 miles

4847 Hopyard Rd Ste 4-424
Pleasanton, CA 94588

2111 Whitehall Place, Suite D10.23 miles

2111 Whitehall Place, Suite D
Alameda, CA 94501

35500 Dumbarton Ct10.26 miles

35500 Dumbarton Ct
Newark, CA 94560

5635 W Las Positas Blvd10.74 miles

5635 W Las Positas Blvd
Pleasanton, CA 94588

556 Mowry Avenue, Suite 10310.75 miles

556 Mowry Avenue, Suite 103
Fremont, CA 94536

2000 Mowry Ave11.00 miles

2000 Mowry Ave
Fremont, CA 94538

2147 Mowry Ave Ste C111.01 miles

2147 Mowry Ave Ste C1
Fremont, CA 94538

3128 Santa Rita Rd11.38 miles

3128 Santa Rita Rd
Pleasanton, CA 94566

3161 Walnut Ave11.50 miles

3161 Walnut Ave
Fremont, CA 94538

2324 Santa Rita Rd Ste 411.55 miles

2324 Santa Rita Rd Ste 4
Pleasanton, CA 94566

2224 Delucchi Dr11.73 miles

2224 Delucchi Dr
Pleasanton, CA 94588

4000 Dublin Blvd Ste 15011.92 miles

4000 Dublin Blvd Ste 150
Dublin, CA 94568

39180 Farwell Dr Ste 23112.23 miles

39180 Farwell Dr Ste 231
Fremont, CA 94538

3200 Busch Rd12.29 miles

3200 Busch Rd
Pleasanton, CA 94566

1517 Grand Ave12.39 miles

1517 Grand Ave
Piedmont, CA 94611

384 Embarcadero W12.45 miles

384 Embarcadero W
Oakland, CA 94607

1700 Broadway Ste 31012.69 miles

1700 Broadway Ste 310
Oakland, CA 94612

Drug Testing Near Me

Searching for convenient drug testing near me in Castro Valley, CA? Accredited Drug Testing, Inc. has a remarkable presence nationwide with over 20,000 locations, providing same-day drug and alcohol testing. Whether it's for a DOT-regulated test, legal obligations like court-ordered screenings, pre-employment drug tests, or simply a personal check-up, our process is swift, ensures privacy, and maintains confidentiality. Our certified collection sites and labs guarantee precise results adhering to all federal and state compliance standards. Contact us at (800) 221-4291 or book online anytime to find a suitable drug testing center near you. Prioritize safety, legality, and tranquility with Accredited Drug Testing, where results are reliably timely and trustworthy.

Drug and Alcohol Testing Options

Urine Drug Testing Available Panels
5 Panel Drug Test (DOT/NON DOT)
5 Panel + Alcohol Drug Test
5 Panel + ETG Alcohol Drug Test
10 Panel Drug Test
10 Panel + ETG Alcohol Drug Test
12 Panel Drug Test
Hair Drug Testing Available Panels
5 Panel Hair Drug Test
5 Panel + ETG Hair Drug Test
10 Panel Hair Drug Test
12 Panel Hair Drug Test
14 Panel Hair Drug Test
16 Panel Hair Drug Test
Alcohol Drug Testing Available Panels
Alcohol Urine Drug Test
ETG Alcohol Test (Urine)
Breath Alcohol Test
Blood Alcohol Test
Peth Alcohol Blood Test
ETG Alcohol Test (Hair)

Customized Testing Options Available l Discounts available for Bulk Purchases l Onsite Drug Testing Services

How Urine Drug Testing Works

In Castro Valley, CA and across the country, urine drug testing is the most widely utilized screening method and is the exclusive test type sanctioned for DOT-regulated drug testing under 49 CFR Part 40. By evaluating a urine sample for drugs, drug by-products, or alcohol markers, recent substance use can be detected. This standardized and confidential procedure ensures the delivery of precise, legally rigorous results for employers, individuals, and legally ordered programs.

Testing Methods & Collection Process

1. Donor Identity Verification

The donor must present a legitimate government-issued ID and complete the necessary chain-of-custody signatures before initiation of testing.

2. Secure Collection Environment

Urine samples are collected in secured restroom facilities to deter tampering, often involving restrictions on personal belongings, securing water sources, and dyeing toilet water as part of security norms.

3. Chain of Custody Documentation

A federally endorsed Chain of Custody Form (CCF) meticulously tracks the sample's journey from collection through to laboratory analysis, preserving the test's integrity and legal viability.

4. Temperature & Validity Checks

Post-collection, the specimen is scrutinized for temperature and appearance accuracy. Additionally, validity testing including checks for creatinine levels, pH, specific gravity, and adulterant presence is conducted.

5. DOT Split Specimen

DOT urine tests involve bifurcation into two vials: Bottle A is utilized for primary analysis and Bottle B for retesting in case of a challenge. For non-DOT tests, a single vial is collected.

6. Laboratory Screening & Confirmation

Samples are processed in SAMHSA-certified laboratories through a dual-step process:

  • Initial Immunoassay Screen: Detects drug classes.
  • Confirmation Testing: Utilizes GC/MS or LC/MS to identify specific drugs or metabolites.

7. MRO Verification

Non-negative results are substantiated by a licensed Medical Review Officer (MRO), who validates the data and discusses any possible medical justifications with the donor prior to final result dissemination.

How Long Do Urine Test Results Take?

  • Instant Urine Test: Immediate feedback for negative results; positives are forwarded to the lab for confirmation typically taking 24-72 hours.
  • Lab-Based Urine Test: 24-48 hours for most negatives.
  • DOT Drug Test: Generally 1-3 business days, factoring in MRO review and donor communication.
  • Urine EtG Alcohol Test: Typically processed within 24-48 hours.

Additional processing time may be necessary for situations involving shy bladders, invalid samples, or where lab validation and donor interaction are essential.

Advantages of Urine Drug & Alcohol Testing

  • The only DOT-endorsed method meeting federal regulation criteria.
  • Detects recent use, especially beneficial in workplace and post-incident analyses.
  • Cost-effective with rapid result delivery.
  • Universally accepted by courts, employers, and governmental bodies.
  • Immediate testing options available for rapid evaluation.
  • Highly precise confirmations via GC/MS or LC/MS technology.

Limitations of Urine Drug & Alcohol Testing

  • Limited detection window (generally 1-7 days for most drugs).
  • Requires stringent security to prevent tampering.
  • Doesn't reflect long-term usage patterns.
  • Necessitates accessible restroom and detailed collection protocols.
  • Standard tests don't detect alcohol unless specifically testing for EtG/EtS.

Despite these limitations, urine tests remain the leading choice for drug and alcohol detection across the nation.

How Hair Drug Testing Works

Introducing Hair Drug and Alcohol Testing in Castro Valley, CA

Hair testing emerges as a pivotal approach for long-term substance use detection, providing a comprehensive 90-day window of insight into an individual's drug or alcohol habits by analyzing metabolites lodged within the hair matrix. Ideal for workplaces, legal scenarios, and more, this method offers reliability that surpasses the limitations of shorter-term detection tests like urine sampling.

Thorough Hair Testing Methods and Collection Procedures

While slightly longer due to in-depth processing, hair testing offers accurate and substantial substance use insight unmatched by other methods.

Alcohol & Drug Testing-How Each Method Works

Accredited Drug Testing offers a comprehensive suite of drug and alcohol testing methods tailored to satisfy the requirements of employers, DOT regulations, legal cases, and personal identification needs. Acquainting oneself with each method allows for strategic choice, conclusive results, and compliance assurance per both federal and Castro Valley, CA regulations. Our expansive network, partnered with certified laboratories and seasoned Medical Review Officers, commits to delivering the precision, credibility, and professionalism integral to optimal testing performance.

Alcohol Urine Drug Test

An alcohol urine test establishes recent drinking activity by detecting ethanol metabolites within the urine. This simple yet cost-effective screening solution is favored for workplace auditing, judicial compliance, and after-incident analysis, although it won't pinpoint current intoxication, it still touches upon recent consumption behaviors.

ETG Alcohol Test (Urine)

The highly precise EtG (Ethyl Glucuronide) urine test uncovers alcohol intake extending up to 80 hours later. Courts, rehabilitation entities, and regulation monitoring agencies leverage this test for its accuracy and reliability, granting a more prolonged detection scope than typical urine measures.

Breath Alcohol Test

A breath alcohol test reflects existing impairment by quantifying alcohol concentration in deep lung air, utilizing DOT-approved breath alcohol devices (EBTs) yielding immediate, valid results necessary for DOT-covered staff, worksite checks, post-incident evaluation, and justified suspicion scenarios.

Blood Alcohol Test

The blood alcohol test evaluates ethanol content directly within the bloodstream, prized for its unparalleled accuracy. Hospital settings, law enforcement, and legal frameworks command this test's use, particularly within DUI evaluations, urgent medical situations, and precise legal inquiries.

PEth Alcohol Blood Test

A PEth (Phosphatidylethanol) blood test distinguishes recurrent or excessive alcohol intake via identifying alcohol-specific biomarkers in red blood cells, detecting usage up to 2-3 weeks. Valued amongst family law, monitoring ordinances, treatment schedules, and safety-inclined pre-employment scenarios for its insight into long-term drinking conduct.

ETG Alcohol Test (Hair)

Extending to a 90-day window, the EtG hair alcohol test analyzes alcohol metabolites entrenched within the hair, suitable for recognizing ongoing or habitual drinking habits rather than sporadic consumption. Legal, child custody, and long-term initiatives particularly covet this method's stability, precision, and resistance against short-term abstinence acts.

With expert guidance, nationally accredited labs, and fast scheduling assurance, Accredited Drug Testing makes sure all alcohol testing pathways offer definitive, comprehensible, and regulatory-compliant results; assisting individuals and employers to remain informed, protected, and fully compliant with regulations in Castro Valley, CA and nationwide.


Accredited Drug Testing provides nationwide drug and alcohol screening solutions, including urine, hair, EtG, PEth, and breath alcohol testing. Backed by SAMHSA-certified laboratories, DOT 49 CFR Part 40 compliance, and scientifically validated testing technology, our services ensure accurate, defensible, and confidential results for employers, courts, and individuals.

Frequently Asked Questions

Urine tests detect recent use and are the only option approved for DOT testing under 49 CFR Part 40. Hair tests provide a 90-day detection window per the Society of Hair Testing (SoHT). Alcohol testing options, EtG, breath, blood, or PEth. These tests can identify recent use, impairment, or long-term drinking behavior depending on the method.

Urine: 24 - 48 hrs for negatives (SAMHSA guidelines).
Hair: 2 - 5 business days due to multi-step forensic processing (SoHT).
Breath Alcohol: Immediate results using NHTSA-approved EBT devices.
PEth: 3 - 5 days based on forensic toxicology studies.

Lab confirmation using GC/MS or LC/MS is the gold standard per SAMHSA & DOT.
Hair testing is highly tamper-resistant (SoHT).
PEth is considered the most reliable marker of repeated drinking (Journal of Analytical Toxicology).

No. DOT-regulated urine tests require validity checks and chain-of-custody documentation (49 CFR Part 40). Hair tests undergo decontamination and metabolite extraction (SoHT), making them extremely difficult to adulterate.

EtG urine detects alcohol for up to 80 hours (NIH/SAMHSA studies). EtG hair detects chronic alcohol consumption for up to 90 days (SoHT alcohol guidelines).

5 Panel DOT:49 CFR Part 40. Expanded non-DOT panels add benzodiazepines, barbiturates, methadone, oxycodone, MDMA, fentanyl, and more (SAMHSA forensic panel standards).

PEth blood testing identifies long-term and heavy alcohol use for 2 - 4 weeks. Used in child custody, treatment monitoring, and professional compliance programs (CDC & Journal of Analytical Toxicology).

Hair testing does not detect drug use within the past 5 - 7 days. It identifies long-term or repetitive use patterns per SoHT standards.

Yes. Results follow strict chain-of-custody procedures, DOT/SAMHSA requirements, GC/MS or LC/MS confirmation, and MRO review; making them acceptable in court, DOT, and legal settings.

Yes. Accredited Drug Testing offers same-day appointments at 20,000+ locations nationwide, instant testing options, and onsite employer testing with bulk discounts.

Customer Reviews

Fast and efficient service

Fast and efficient service for employers wanting to do pre employment drug screening that meets DOT requirements!!

Mary Thomas - 4/5/2025

Had very fast and good service

Had very fast and good service, was able to get an appointment same day with the nearest facility. My questions were answered thoroughly but quick. Definitely recommend

Jacob Matzke - 11/19/2024

quick to assist

They are very quick to assist with your orders and they helped when I needed to find a new testing facility.

Gary Matkin - 2/19/2025

Everything was great

Everything was great, the staff was very polite. Thank you.

Olga Petrova - 9/19/2024

A very nice company

A very nice company of expertise. The staff will go above to help you out of your situation in a timely matter 👏

Tam Jack - 2/19/2025


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Fast, reliable alcohol testing to keep your workplace safe and compliant every single day in Castro Valley, CA.

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Reliable nationwide drug testing services ensuring accuracy, compliance, and quick results for businesses and individuals in Castro Valley, CA.

Castro Valley 5 Panel Drug Test

Accurate 5 panel drug testing with fast, confidential results—trusted by Castro Valley, CA employers and individuals nationwide.

Castro Valley 10 Panel Drug Test

Comprehensive 10 panel drug testing with fast, reliable results—trusted for Castro Valley, CA workplace and personal testing needs.

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Convenient on-site mobile drug testing with fast, reliable results—saving time while keeping your Castro Valley, CA workplace compliant.

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Certified DOT physicals with quick, reliable exams to keep Castro Valley, CA drivers compliant and on the road with confidence.

DOT Consortium

Join our DOT consortium for hassle-free compliance, random testing management, and reliable driver safety solutions.

(800) 221-4291