Drug Testing Locations - Walnut, CA

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

36 Drug-Testing Centers in Walnut

Minutes Away, Test Today

1981 N Broadway Ste 1900.18 miles

1981 N Broadway Ste 190
Walnut Creek, CA 94596

1425 S Main St1.01 miles

1425 S Main St
Walnut Creek, CA 94596

108 La Casa Via, Ste 1051.21 miles

108 La Casa Via, Ste 105
Walnut Creek, CA 94598

320 Lennon Ln Fl 22.42 miles

320 Lennon Ln Fl 2
Walnut Creek, CA 94598

401 Gregory Ln, Ste 1462.99 miles

401 Gregory Ln, Ste 146
Pleasant Hill, CA 94523

609 Gregory Ln Ste 1003.01 miles

609 Gregory Ln Ste 100
Pleasant Hill, CA 94523

2090 Commerce Ave4.85 miles

2090 Commerce Ave
Concord, CA 94520

2280 Diamond Blvd Ste 5204.95 miles

2280 Diamond Blvd Ste 520
Concord, CA 94520

2231 Galaxy Ct4.96 miles

2231 Galaxy Ct
Concord, CA 94520

2477 Pacheco St5.46 miles

2477 Pacheco St
Concord, CA 94520

2425 East Street, Suite 65.52 miles

2425 East Street, Suite 6
Concord, CA 94520

2540 East St5.58 miles

2540 East St
Concord, CA 94520

1805 Arnold Dr6.23 miles

1805 Arnold Dr
Martinez, CA 94553

5167 Clayton Rd Ste H6.35 miles

5167 Clayton Rd Ste H
Concord, CA 94521

827 Arnold Dr Ste 706.86 miles

827 Arnold Dr Ste 70
Martinez, CA 94553

200 Muir Rd Hacienda Bldg, 1st Floor7.19 miles

200 Muir Rd Hacienda Bldg, 1st Floor
Martinez, CA 94553

3237 Alhambra Ave Ste 27.49 miles

3237 Alhambra Ave Ste 2
Martinez, CA 94553

2301 Camino Ramon Ste 10810.49 miles

2301 Camino Ramon Ste 108
San Ramon, CA 94583

6001 Norris Canyon Rd Ste 14210.58 miles

6001 Norris Canyon Rd Ste 142
San Ramon, CA 94583

5601 Norris Canyon Rd Ste 14010.58 miles

5601 Norris Canyon Rd Ste 140
San Ramon, CA 94583

2450 Ashby Ave11.06 miles

2450 Ashby Ave
Berkeley, CA 94705

4749 Surrey Ln11.19 miles

4749 Surrey Ln
El Sobrante, CA 94803

1517 Grand Ave11.29 miles

1517 Grand Ave
Piedmont, CA 94611

1001 Pittsburg Antioch Hwy Ste B11.43 miles

1001 Pittsburg Antioch Hwy Ste B
Pittsburg, CA 94565

3774 Railroad Ave Ste C11.55 miles

3774 Railroad Ave Ste C
Pittsburg, CA 94565

4069 Piedmont Ave Ste 91011.65 miles

4069 Piedmont Ave Ste 910
Oakland, CA 94611

3701 Broadway Fl 511.98 miles

3701 Broadway Fl 5
Oakland, CA 94611

3300 Webster St, Ste 111012.24 miles

3300 Webster St, Ste 1110
Oakland, CA 94609

350 Hawthorne Ave12.31 miles

350 Hawthorne Ave
Oakland, CA 94609

538 Stone Rd Ste G12.40 miles

538 Stone Rd Ste G
Benicia, CA 94510

1901 Railroad Ave Ste B12.48 miles

1901 Railroad Ave Ste B
Pittsburg, CA 94565

1251 California Ave Ste 60012.85 miles

1251 California Ave Ste 600
Pittsburg, CA 94565

2505 Bataan St Ste O12.87 miles

2505 Bataan St Ste O
Oakland, CA 94607

2850 7th St Ste 10012.90 miles

2850 7th St Ste 100
Berkeley, CA 94710

1700 Broadway Ste 31013.12 miles

1700 Broadway Ste 310
Oakland, CA 94612

6001 Shellmound St Ste 85013.30 miles

6001 Shellmound St Ste 850
Emeryville, CA 94608

Employment, DOT, Court Ordered, Probation, Family

At our 36 Walnut, CA testing centers, Accredited Drug Testing delivers full-scale drug and alcohol screening solutions. Our services encompass DOT and non-DOT urine drug tests, breath alcohol tests, EtG alcohol evaluations, and hair drug screenings for personal, employment, or legal purposes. Offering swift test results and certified laboratory analyses, tests are conducted the same day; plus, most Walnut test sites are conveniently close to your residence or workplace. We also provide Occupational Health Testing, Clinical Testing, and Background Checks.

Dial (800) 221-4291 or register via our website. Pick your preferred test and the nearest location—testing is open for yourself, your staff, or another person. Booking an appointment is quick and simple, with our scheduling team available by phone or through our 24/7 online scheduling service. Our practical approach ensures setting up a drug test near Walnut is seamless.

* You must register by phone or online to receive your donor pass/registration prior to proceeding to the testing center. You must bring a valid government issued ID along with the registration/barcode number which was sent to you by email.

When you're searching for drug testing near me or drug testing locations, we provide a simple and convenient process to find a drug and alcohol testing location near you that is certified to provide all of your drug and alcohol testing needs.

Walnut, CA Drug Testing

Drug Testing Services Available at Our Walnut, CA Labs:

At our Walnut drug testing collection sites, Accredited Drug Testing provides one of the widest selections of drug and alcohol testing services available. Whether you're an employer, attorney, court, or private individual, we offer both DOT and non-DOT testing options—ranging from rapid tests to comprehensive lab-based screenings—capable of detecting nearly any substance.

Mobile/On-Site Drug Testing

If you're an employer needing to test 25 or more employees and looking to save time and money, we offer mobile on-site drug testing where we come to you. Call us today for more information.

Drug Testing in Walnut, CA

Walnut, California Statistics

In 2022, Walnut, CA saw a 15% increase in opioid-related incidents within Los Angeles County.

Los Angeles County, which includes Walnut, reported over 3,000 drug overdose deaths in 2021.

Fentanyl accounted for 55% of illicit drug cases in Walnut, CA as of 2021.

In 2021, drug-related hospital admissions in Walnut, CA increased by 10% compared to 2020.

Youth drug abuse in Los Angeles County, including Walnut, rose by 8% from 2020 to 2021.

Walnut, CA experienced a 20% rise in methamphetamine-related arrests in 2022, according to county reports.

How does the body eliminate Drugs

Drug elimination is the sum of the processes of removing an administered drug from the body. In the pharmacokinetic ADME scheme (absorption, distribution, metabolism, and excretion), it is frequently considered to encompass both metabolism and excretion. Hydrophobic drugs, to be excreted, must undergo metabolic modification making them more polar. Hydrophilic drugs, on the other hand, can undergo excretion directly, without the need for metabolic changes to their molecular structures.

Although many sites of metabolism and excretion exist, the chief organ of metabolism is the liver, while the organ primarily tasked with excretion is the kidney. Any significant dysfunction in either organ can result in the accumulation of the drug or its metabolites in toxic concentrations.

A variety of other factors impact elimination — intrinsic drug properties, such as polarity, size, or pKa. Also other factors include genetic variation among individuals, disease states affecting other organs, and pathways involved in the way the drug distributes through the body, such as first-pass metabolism.

Issues of Concern

Drug elimination is the removal of an administered drug from the body. It is accomplished in two ways, either by excretion of an unmetabolized drug in its intact form or by metabolic biotransformation followed by excretion. While excretion is primarily carried out by the kidneys, other organ systems are involved as well. Similarly, the liver is the primary site of biotransformation, yet extrahepatic metabolism takes place in a variety of organ systems affecting multiple drugs.

Given the multiple organ systems and the variety of metabolic transformations present, drug elimination can entail a significant degree of complexity. Hydrophilic drugs are typically directly excreted by the kidneys, while hydrophobic drugs undergo biotransformation before excretion. The purpose here is twofold – biotransformation serves both detoxify the exogenous substances as well as to increase their hydrophilicity, ensuring their elimination via the kidneys.

Two broad metabolic pathways of hepatic drug transformation exist. Phase I is the direct modification of the target molecule, whereas phase II entails conjugation of the target to a polar molecule of low molecular weight. Phase I prepare the drug to enter phase II, but single-phase metabolism also exists.

Phase I involves oxidation, reduction, and hydrolysis of the exogenous molecule. These reactions are accomplished by hepatic microsomal enzymes, which reside in the smooth endoplasmic reticulum of the hepatocytes. Best known among them is the cytochrome P450 system, whose enzymes are predominantly involved in oxidative metabolism. Within the cytochrome P450 family (CYP), the enzyme responsible for the metabolism of more than 50% of existing drugs is the CYP3A4. Its activity encompasses various classes of medications, including opioids, immunosuppressants, antihistamines, and benzodiazepines. The enzymes can also be induced or inhibited by a variety of substances they interact with, including pharmaceuticals. The increase in metabolic activity with CYP induction results in a diminished activity of drugs targeted by that particular isoform. Conversely, CYP inhibition will result in increased drug plasma concentration, potentially leading toxicity. The CYP3A4 is induced by phenytoin, phenobarbital, and St. John's wort, while diltiazem, erythromycin, and grapefruit inhibit it. Caution is, therefore, necessary when administering CYP3A4-metabolized drugs in the presence of any of the inhibitors or inducers.

Phase II consists of covalent bonding of polar groups to nonpolar molecules to render them water-soluble and allow renal or biliary excretion. Target molecules enter phase II directly or via initial processing through phase I. A variety of polar adjuncts is transferred, including amino acids, glucuronic acid, glutathione, acetate, and sulfate. Glucuronidation is one of the major pathways of phase II biotransformation. The UDP-glucuronosyltransferase (UGT) enzyme family performs this activity. Typically, glucuronide derivatives possess less or no activity of the original drug, but in some cases, pharmacologically active compounds result. Morphine-6-glucuronide is a phase II metabolite of morphine with significant analgesic activity. As with the CYP enzymes, inducers, and inhibitors of phase II, enzymes exist and may influence the efficacy of drugs that rely on conjugation before excretion.

The first-pass effect is a feature of hepatic metabolism that also plays a role in the elimination of multiple drugs. Here, the enteric consumed drugs are exposed directly to the liver via the portal vein, where they undergo biotransformation before entering the systemic circulation. This activity reduces the bioavailability and needs to be factored into the dose administered to the patient. Intravenously administered drugs are not subject to the first-pass effect.

Extrahepatic drug metabolism takes place in the GI tract, kidneys, lungs, plasma, and skin.

Renal excretion completes the process of elimination that begins in the liver. Polar drugs or their metabolites get filtered in the kidneys and typically do not undergo reabsorption. They subsequently get excreted in the urine. Urinary pH has a significant impact on excretion, as drug ionization changes depending on the alkaline or acidic environment. Increased excretion occurs with weakly acidic drugs in basic urine and weakly basic drugs in acidic urine.

Excretion in the bile is another significant form of drug elimination. The liver can actively secrete ionized drugs with a molecular weight greater than 300 g/mol into bile, from where they reach the digestive tract and are either eliminated in feces or reabsorbed as part of the enterohepatic cycle.

Other pathways of excretion include the lungs, breast milk, sweat, saliva, and tears

Employers in Walnut, CA & Drug Testing Policies

Employers in Walnut, CA, are increasingly cautious about drug use in workplaces. Many businesses have adopted stringent drug testing policies, adhering to the standards set by California's Department of Industrial Relations. These policies usually include pre-employment screening and random drug tests to ensure a safe working environment.

Furthermore, companies often collaborate with state and local government programs to provide support for employees struggling with substance abuse. Partnering with organizations such as the Los Angeles Reach Out Program, Walnut employers ensure that assistance is readily accessible, thus fostering a supportive work culture.

Government Efforts with Drug Problems in Walnut, CA

The government efforts to address drug problems in Walnut, CA, are multifaceted. The city collaborates with Los Angeles County's Department of Public Health, which implements educational programs aimed at reducing substance abuse. One such initiative is the Substance Abuse Prevention and Control (SAPC) program, which provides resources and support to prevent and treat addiction.

On the state level, California has various initiatives that impact Walnut, focusing on preventative measures and treatment accessibility. The state-backed Department of Health Care Services works alongside county agencies to fund and manage programs on both prevention and recovery, directly assisting local bodies to curb the drug menace.

Local Drug Busts & News in Walnut, CA

In Walnut, CA, recent local drug busts have brought significant attention to the area. Authorities have intensified operations, focusing on reducing the influx of illegal substances. Through vigilant efforts and community cooperation, law enforcement has been able to dismantle several drug networks, leading to multiple arrests and seizures of contraband. These operations are crucial in safeguarding Walnut's public health and safety.

A collaborative effort involving Walnut's local police and federal agencies recently led to a successful drug raid. The operation targeted a suspected distribution ring operating out of a residential neighborhood. The raid resulted in the confiscation of various controlled substances, including synthetic opioids and amphetamines. Community members have expressed relief, praising the decisive action taken to curb local drug activity.

The impact of drug-related events in Walnut extends beyond law enforcement, echoing throughout the community. Local organizations have ramped up educational programs aimed at preventing substance abuse, especially amongst youth. These initiatives are designed to raise awareness about the dangers of drug use and provide resources for those seeking help. Community leaders are actively engaging with residents to build a safer, healthier environment.

Walnut's commitment to combating drug issues is evident in its proactive measures. Through targeted patrols and undercover operations, the city aims to disrupt illegal drug trade corridors. Recent successes have fostered a sense of unity among residents, who continue to support local law enforcement efforts. Such community collaboration is pivotal in creating a resilient defense against the pervasive challenges posed by drug-related offenses.

While challenges persist, the increased frequency of drug busts in Walnut highlights effective policing strategies. Innovative methods, such as leveraging technology and data analysis, are proving instrumental in identifying and dismantling drug operations. Walnut's approach serves as a model for similar communities facing drug-related challenges, emphasizing the importance of adaptability and community involvement in maintaining public safety.

Occupational Health Services

Accredited Drug Testing offers fast, reliable employment screening services in Walnut, CA. Trusted by employers nationwide for accurate results and exceptional service.

California DOT/Non DOT Physicals

California Vision Tests

California Audiograms

California Respirator Fit Tests

California Lift Tests

California Background Checks

Resources & Citations

SAMHSA National Helpline

Santa Clara County Behavioral Health

California Association of DUI Treatment Programs

CA Department of Health Care Services - Behavioral Health

California Health Care Foundation - Substance Use Disorder

211 LA County - Drug and Alcohol Services

Tarzana Treatment Centers

California Partners For Recovery

Walnut Drug Testing

Quickly find trusted local drug testing centers in Walnut, CA — fast, convenient, and reliable every time!

Walnut DOT Drug Testing

Quickly find a local DOT drug testing center in Walnut, CA — fast, reliable, convenient nationwide service!

Walnut DNA Testing

DNA testing for legal and non-legal purposes including child support, and child custody around Walnut, CA.

Walnut Industry Training

Including specimen collector training, DER training, reasonable suspicion training and much more in Walnut, CA.v

Walnut Hair Drug Testing

Get fast, accurate hair drug testing at our convenient Walnut, CA locations—results you can trust, every time!

Walnut Alcohol Testing

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

Walnut Drug Testing Services

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

Walnut 5 Panel Drug Test

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

Walnut 10 Panel Drug Test

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

Walnut On Site Drug Testing

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

Walnut DOT Physicals

Certified DOT physicals with quick, reliable exams to keep Walnut, 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.


Frequently Asked Questions

Yes. Accredited Drug Testing maintains access to numerous collection sites nationwide, so in most cases a testing location is available close to a donor’s home, workplace, or job site. Same-day scheduling is often possible for both drug and alcohol testing needs.
Employers, DOT-regulated companies, attorneys, courts, probation departments, and private individuals all use Accredited Drug Testing locations. You do not need to be part of a large company to request testing — individuals can order testing directly.
Locations support urine drug tests, hair follicle drug tests, saliva/oral fluid drug tests, instant/rapid screening (where permitted), and evidential breath alcohol testing. Post-accident and reasonable suspicion testing are also available.
Yes. Accredited Drug Testing supports DOT-compliant urine drug testing and evidential breath alcohol testing following 49 CFR Part 40 requirements. This includes pre-employment, random, post-accident, reasonable suspicion, return-to-duty, and follow-up testing for safety-sensitive employees.
In many cases, yes. Same-day or next-day appointments can typically be arranged. This is especially important for urgent needs such as post-accident, reasonable suspicion, court deadlines, or probation compliance.
Yes. Results are released only to the authorized recipient — for example, an employer’s designated representative, the court or probation contact, or the individual who ordered the test. Results are handled securely and are suitable for policy enforcement and legal documentation.
Yes. Accredited Drug Testing offers on-site and mobile collections for employers. Mobile testing is useful for post-accident response, reasonable suspicion situations, high-volume hiring events, and remote job sites where sending employees offsite would cause downtime.
No. You do not need a physician's prescription to request most drug or alcohol tests. Individuals, employers, attorneys, and probation officers can schedule testing directly and send the donor to the assigned collection site.

Customer Reviews

Very Fun and Easy

Trish last week and Tatiana this week, very fun and easy folks to deal with. Well be using them more and more in the future.

Tom O - 12/19/2024

Sweet and helpful

Trish was amazing and got me through the sytem very fast and swift. I had a hard time hearing her a couple of times, but she was super sweet and helpful throughout the process. Highly recommend her!

Sophia Schutze - 6/19/2024

Super helpful and courteous

I've had to use this service twice for out of state physicians we've hired and both times it was super easy. Both customer service reps I spoke with were super helpful and courteous. I won't hesitate to use their service again if needed.

Alicia Rau - 6/19/2024


(800) 221-4291