Salary : $67,225.20 - $85,809.84 Annually
Location : Los Angeles County, CA
Job Type: Full time
Job Number: C3859K
Department: PUBLIC WORKS
Opening Date: 08/17/2026
Closing Date: Continuous
Position/Program InformationEXAM NUMBERC3859K
FILING PERIOD The application filing period will begin on Tuesday, August 18, 2026, at 8:00 a.m. (PT)-Continuous. We will keep accepting applications until the position is filled. The application window may close unexpectedly once we have enough qualified candidates.
TYPE OF RECRUITMENTWe welcome applications from anyone.
Why work for us?With more than 10 million residents, Los Angeles County has the largest population of any county in the nation! As the largest employer in Southern California, with more than 39 diverse departments and over 2,100 different job descriptions, the County offers a lifetime of opportunities and careers. We are Los Angeles County Public Works, the largest municipal Public Works agency in the nation. With more than 4,000 employees, Public Works offers over 500 different types of career opportunities that promote professional and personal growth as well as a rewarding and exciting work environment!
For more information about our amazing benefits, please visit us here:
If you have questions about working for LA County, including current open recruitments, tips on crafting a resume or acing an interview, career planning, or any other general information, please visit our website at:
WITHHOLDS WILL NOT BE ACCEPTED FOR THIS EXAMINATION. REQUIRED EXPERIENCE MUST BE FULLY MET AT THE TIME OF FILING, AND CLEARLY INDICATED ON THE APPLICATION. Essential Job Functions - Collects specimens of soil, aggregates, concrete, and asphalt for accurate testing.
- Evaluates sample data using Greenbook specifications, project specifications, and test data.
- Excavates soil samples using hand tools.
- Conducts laboratory and field tests on construction materials.
- Performs density and compaction tests.
- Performs concrete cylinder strength tests.
- Performs complex physical tests on undisturbed samples.
- Inspects galvanizing, coatings, and reinforcing steel.
- Monitors construction materials.
- Interprets testing and inspection requirements.
- Records test data and inspection results.
- Provides technical guidance to lower-level testing staff.
- Coordinates testing and inspections activities.
- Ensures compliance with applicable laws, regulations, specifications, and testing standards.
For more information, please view the classification specification:
Requirements REQUIREMENTS TO QUALIFY:Two years' experience at the level of Engineering Testing Aid III*.
LICENSE:A valid California Class C Driver License or the ability to utilize an alternative method of transportation when needed to carry out job-related essential functions.
PHYSICAL CLASS:Physical Class 4 - Arduous: This class involves frequent heavy lifting over 25 pounds, often combined with bending, twisting, or working above ground on irregular surfaces. It includes those positions that occasionally demand extraordinary physical activity such as those in Safety positions.
SPECIAL REQUIREMENT INFORMATION:*Experience at the level of an Engineering Testing Aid III in the service of County of Los Angeles is defined as: Performs physical, laboratory, and field tests of engineering construction materials. For a fuller description of work performed, refer to County of Los Angeles Class Specifications for
You may still qualify even if your job title is not exactly the same as the ones listed. What matters is that your experience is at a similar level - meaning your job involves similar responsibilities, requires comparable skills and knowledge, and takes place within a similar organizational structure. Please provide a clear explanation of your experience to demonstrate that it is at the appropriate level.
Additional InformationEXAMINATION CONTENTThis examination will consist of
TWO (2) parts:
PART I: Multiple Choice and Simulation Assessment,
weighted at 50%, measuring:
- Achievement
- Mechanical Comprehension
- Responsibility
- Safety Orientation
- Teamwork
- Thoroughness
- Numerical Calculation
PART II: Multiple-Choice test,
weighted at 50%, measuring:
- Professional/Technical Knowledge of Construction Materials and Testing Methods
- Professional/Technical Knowledge of Testing Equipment and Tools
- Knowledge of Specifications, Standards, and Inspection Requirements
- Knowledge of Safety Practices and Regulations
- Materials Testing Skill
- Sampling and Specimen Preparation Skill
MULTIPLE-CHOICE AND/OR SIMULATION ASSESSMENTS ARE NOT REVIEWABLE BY CANDIDATES PER CIVIL SERVICE RULE 7.19.APPLICANTS MUST MEET THE REQUIREMENTS AND ACHIEVE 70% OR HIGHER ON THE COMBINED SCORE OF PARTS I AND II IN ORDER TO BE PLACED ON THE ELIGIBLE LIST.TESTING ACCOMMODATION:If you require an accommodation to fairly compete in any part of the assessment process, you will be given the opportunity to make a request when completing your application. Please note, you may be required to submit documentation from a qualified medical provider or other qualified professional to support your request for a testing accommodation.
TRANSFER OF TEST COMPONENTS:If you have taken identical components recently for other exams, your responses may be automatically transferred to this examination. This exam contains test components that might be used on future exams, and your responses could be transferred to that exam.
SCORES CANNOT BE GIVEN OVER THE TELEPHONE.TEST PREPARATION:We provide study guides and other test preparation resources to help candidates prepare for employment tests. While the guides may help in preparing for the test, we recommend reviewing all related materials that seem necessary.
- Various information can be found on our website at The section dedicated to test preparation is "Employment Test Assistance".
- Online practice tests are available at
- You can also visit our Los Angeles County Online Assessment Preparation Series webpage at for information about common online assessment types, sample questions, and test-taking tips.
ELIGIBILITY AND VACANCY INFORMATION:Applicants who passed the assessment(s) are placed on a list for a period of 12 months. Applications will be processed as they are received and added to the list accordingly. We will use this list to fill vacancies in Public Works as they occur.
APPLICATION AND FILING INFORMATION:We only accept applications filed online. Applications submitted by U.S. mail, fax, or in person are not accepted. Apply online by clicking on the "Apply" green button at the top right of this posting. This website can also be used to get application status updates.
Please fill out the application completely. Provide relevant job experience including employer's name and address, job title, beginning and ending dates, number of hours worked per week, and description of work performed.
We may verify information included in the application at any point during the examination and hiring process, including after an appointment has been made. Falsification of information could result in refusal of application or rescission of appointment. Copying verbiage from the Requirements or class specification as your work experience will not be sufficient to demonstrate meeting the requirements. Doing so may result in an incomplete application and may lead to disqualification.
We will send notifications to the email address provided on the application, so it is important that you provide a valid email address. If you choose to unsubscribe or opt out from receiving our emails, it is possible to view notices by logging into governmentjobs.com and checking the profile inbox. It is every applicant's responsibility to take steps to view correspondence, and we will not consider claims of missing notices to be a valid reason for re-scheduling an exam part. Register the below domains as approved senders to prevent email notifications from being filtered as spam/junk mail.
New email addresses need to be verified. This only needs to be done once per email address and can be done at any time by logging in to governmentjobs.com and following the prompts. This is to enhance the security of the online application and to prevent incorrectly entered email addresses.
SOCIAL SECURITY NUMBER: Federal law requires that all employed persons have a Social Security Number, so include yours when applying.
COMPUTER AND INTERNET ACCESS AT PUBLIC LIBRARIES: For candidates who may not have regular access to a computer or the internet, applications can be completed on computers at public libraries throughout Los Angeles County.
NO SHARING OF USER ID, E-MAIL, AND PASSWORD: All applicants must file their application using their own user ID and password. Using a family member or friend's user ID and password may erase a candidate's original application record.
ANTI-RACISM, DIVERSITY, AND INCLUSION (ARDI): The County of Los Angeles recognizes and affirms that all people are created equal and are entitled to all rights afforded by the Constitution of the United States. We are committed to promoting Anti-racism, Diversity, and Inclusion efforts to address the inequalities and disparities amongst race. We support the ARDI Strategic Plan and its goals by improving equality, diversity, and inclusion in recruitment, selection, and employment practices.
CONTACT INFORMATION:Department Contact Name: Dennis Hughes
Department Contact Phone: Department Contact Email: ADA Coordinator Phone: Teletype Phone: California Relay Services: COUNTY OF LOS ANGELES Employment InformationAny language contained in the job posting supersedes any language contained below.This document is intended to provide general information about the recruitment process of the County of Los Angeles. Applicants with questions about a specific job posting should contact the exam analyst listed on the posting.
Equal Employment Opportunity/Non-Discrimination Statement:The County of Los Angeles is an Equal Employment Opportunity Employer and is committed to non-discrimination in the County workforce, regardless of age (40 and over); ancestry; color; ethnicity; religious creed; protected family or medical leave status; disability; marital status; medical condition; genetic information; military and veteran status; national origin; race ; sex; gender; sexual orientation; or any other characteristic protected by State or federal law. For more information, please visit:
Testing Accommodations for Applicants:The County of Los Angeles complies with all federal and state disability laws and makes reasonable accommodations for qualified applicants and employees with disabilities. If a reasonable accommodation is needed to participate in the job application process, please contact the testing accommodation coordinator listed on the job posting. Hearing impaired applicants with telephone teletype equipment may leave messages by calling the teletype phone number on the job posting. For more information on accommodations, please visit:
Fair Chance:The County of Los Angeles is a Fair Chance employer. Except as otherwise permissible under applicable laws, you will not be asked to provide information about conviction history unless you receive a conditional offer of employment. The County will make an individualized assessment of whether your conviction history has a direct and adverse relationship with the specific duties of the job, and will also consider potential mitigating factors, which may include, but is not limited to, evidence and extent of rehabilitation, recency of the offense(s), and age at the time of the offense(s). If asked to provide information about conviction history, any convictions or court records which are exempted by a valid court order do not have to be disclosed. Qualified applicants with arrest or conviction records will be considered for employment in accordance with County Fair Chance Policies and the Fair Chance Act (Gov. Code Section 12952).
Employment Eligibility:Final appointment is contingent upon verification of U.S. citizenship or the right to work in the United States.
Career PathFinder:Resources to help current and prospective employees plan a career with Los Angeles County are available. To explore career paths to and from nearly all job titles, please visit our interactive Career PathFinder application at
Veteran's Credit:Pursuant to the County Charter and County policy, in all open competitive examinations (i.e., examinations open to everyone), the County of Los Angeles will add a credit of 10 percent of the total credits specified for such examination to the final passing score of an honorably discharged veteran, as well as the spouse of a deceased or disabled veteran, who served in the Armed Forces of the United States under specific conditions.
For more information on veteran's credit, please visit:
Revised September 2025
For detailed information, please click
01
All important notifications including invitation letters will be sent electronically to the email address provided on the application. It is important that you provide a valid email address. DO NOT select "off" under Email Preferences within your profile or click "unsubscribe" on our notices, if you would like the County of Los Angeles to notify you regarding your application status, test schedules, and other important information pertaining to your candidacy for this position.
Please add the following emails to your email address and list of approved senders to prevent email notifications from being filtered as spam/junk/clutter mail. It is your responsibility to take the above steps to view correspondence. Los Angeles County will not consider claims of not viewing or receiving notifications to be a valid reason for late test administration or rescheduling of a test component.
- I understand the above information and instructions.
02
Applicants have the ability to opt out of emails from Los Angeles County. If you unsubscribe, you will not receive email notifications for any examination for which you apply with Los Angeles County. If you choose to unsubscribe, you can check for notifications by logging into governmentjobs.com to view your profile inbox. Exam scores cannot be disclosed over the phone.
- I understand the above information and instructions.
03
The information you provide on this supplemental questionnaire will be evaluated and used to determine your eligibility to participate in the next phase of the examination process. CHECK YOUR ANSWERS CAREFULLY. Any mistakes you make and/or incomplete responses you provide in completing these questions will be used to disqualify your application even if you possess the qualifying experience. Please be as specific as possible. Comments such as "see resume or application" will not be considered as a response. Please note that all information is subject to verification at any time in the examination and hiring process. Falsification of any information may result in disqualification or dismissal.
Your responses to the supplemental questionnaire do not replace the requirement to complete the Work Experience section of your application. You must still complete that section in full. For each job or position held, you must provide the employer's name and address, your job title, beginning and ending dates, number of hours worked per week, and a detailed description of duties performed. Positions or experience that are grouped together will not be accepted; each position and the experience gained must be listed separately. If you are a Los Angeles County employee who has held multiple positions, do not list all of your time with the County under your current payroll title.
- I understand the above information and instructions.
04
How many years of experience do you have at the level of Engineering Testing Aid III*?
*Experience at the level of an Engineering Testing Aid III in the service of County of Los Angeles is defined as: Performs physical, laboratory, and field tests of engineering construction materials.
You may still qualify even if your job title is not exactly the same as the ones listed. What matters is that your experience is at a similar level - meaning your job involves similar responsibilities, requires comparable skills and knowledge, and takes place within a similar organizational structure. Please provide a clear explanation of your experience to demonstrate that it is at the appropriate level.
- 2 years or more
- 1 year to less than 2 years
- Less than 1 year
- N/A - Not Applicable
05
If you indicated you have experience in Question #4, in the text box below, you must briefly describe the duties you perform that supports your response.
Only provide the experience(s) that supports your response in Question #4. For each experience, please indicate the following information:
- Position Title
- Employer
- Immediate Supervisor name(s) and phone number
- Approximate dates of your experiences From (mm/yr) - To (mm/yr)
- Number of hours worked per week
- Describe duties in detail
If you do not have any experience under this option, please write
"DOES NOT APPLY".Comments such as "see resume or application" will not be considered as a response.You will not receive credit for your response if you have missing requested information. Please ensure the experience you claim is consistent with the experience section listed on your application.Required Question
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