Senior Environmental Scientist III

apexcompanies

Fullerton, CA · Fullerton · United States

Posted Jun 19, 2026

Full-time
13 CWE

Job description

Are you driven to grow, lead, and make a meaningful impact? At Apex, we’re building more than a consulting and engineering firm—we’re creating a place where your career accelerates, your contributions matter, and your potential is fully realized. We believe your growth is our growth, which is why we invest in your development at every stage of your career. Here, you’ll work on projects that shape communities, protect the environment, and create lasting impact, all while being empowered with the autonomy and flexibility to do your best work.

Fueled by high-quality delivery, exceptional client retention, and strategic acquisitions, Apex Companies continues to rank among the fastest-growing firms in the AEC industry, recently recognized by the Zweig Group for our industry-leading growth. Our success is grounded in strong leadership, a collaborative culture, and a shared commitment to delivering exceptional outcomes.

As we continue to expand, we're looking for high-performing professionals who are ready to lead, collaborate, innovate, and create impact. At Apex, you help shape what's next. When we succeed together, we share in that success. All Apex positions are eligible for annual bonus opportunities, reinforcing our commitment to recognizing and rewarding meaningful contributions that drive our collective growth.

CWE, An Apex Company, is a dynamic, award-winning provider of consulting, engineering, technical, and construction management services. Clients trust CWE to provide innovative and sustainable solutions to solve complex problems involving civil infrastructure, water resources, and the environment. CWE is an integrated firm with a reputation for delivering engineering solutions that improve the quality of life in a fiscally responsible and holistic manner, consistent with our vision of Creating a better tomorrow, today®.

We develop and implement real world solutions that are practical and cost-effective to create value for our clients and enhance our communities and environment.

Why Work for Us?

This is not a "job" – it is a career with a rapidly-growing organization in a dynamic industry that recognizes excellent performance and provides opportunities for growth and advancement. This is a fantastic opportunity to develop valuable engineering and technical skills under industry recognized leaders. In addition, as a firm that is leading the industry with innovative and creative approaches to solving environmental and engineering challenges, our employees leave the office each day knowing they have contributed to a positive movement that will improve our communities, environment, and the world. Join a 2,000+ employee national firm with 70+ locations across the United States.

We have an exciting opportunity for an outstanding individual to join our team as an Senior Environmental Scientist III at our headquarters in Fullerton, California.

General Characteristics

Responsible for assisting municipal, utility, industrial, and commercials clients with stormwater planning and compliance efforts associated with Phase I and II Municipal Separate Storm Sewer System (MS4) Permits, the Construction General Permit (CGP), and Industrial General Permit (IGP).
Interpret complex regulatory permits, assist clients with regulatory compliance, prepare technical reports, conduct environmental compliance inspections and sampling, and complete high quality deliverables on time and within budget
Lead environmental sampling, testing, and observations (primarily surface water, stormwater, groundwater, wastewater

Critical Tasks and Responsibilities

Assistant Project Management
Interpret regulatory permits and formulate compliance strategies
Prepare comprehensive approaches, work plans, technical reports and documents (watershed management plans, stormwater management plans, annual reports, non-stormwater discharge source assessments, adaptive management plans, compliance guidance documents, compliance reports, rain and sampling event summary reports, SWPPPs, WQMPs, etc.)
Execute/manage field investigations
Manage workload of other Environmental Scientist staff
Prepare/Monitor Project Budgets
Meet with clients regarding work and performance of team, and regarding current and future work
Perform construction site and facility environmental compliance inspections (QSP, QISP, FOG)
Conduct environmental sampling, testing, and observations (primarily surface water, stormwater, groundwater, wastewater, along with soils and sediments)
Make field observations and perform data measurement and collection assignments
Data management and analysis (compilation, manipulation, and evaluation of data)
Develop and implement monitoring and reporting plans and field studies
Perform regulatory and water quality data analyses
Participate/lead in technical presentations

Required Competencies and Qualifications

BS in Environmental Science, Civil or Environmental Engineering, or a related field
5+ years of professional work experience
Knowledge of stormwater permitting and planning; water quality monitoring; BMPs; and environmental compliance inspections
CPSWQ/CPESC certification
QSD or QSP and QISP certifications
Able to read, interpret, and analyze plans, technical manuals, and permits
Strong analytical skills
Ability to pay attention to detail with a high level of accuracy
Demonstrates a strong work ethic
Excellent writer and communicator
Proactive approach/self-starter/takes initiative/positive attitude/team player
Proficient in Microsoft Office Suite
Ability to kneel, climb, and lift up to 50lbs
Valid California driver’s license and insurable driving record

Desired Competencies and Qualifications

The following competencies and qualifications are a plus, but not required:

MS or PhD in Environmental Science, Civil or Environmental Engineering, or a related field
Proficient with ArcGIS
OSHA 40-hour HAZWOPER training
Perform maintenance and calibration of environmental monitoring instruments, meters, probes, and automated sampling equipment

#LI-BS1

Apex Job Title: Scientist 3 - Sr Project Scientist

Req ID:

11757

Annual Expected Pay Range

$83,000—$125,000 USD

We believe in equality for all and celebrate the diversity and differences of our employees, customers, and communities. We do not discriminate based on gender, race or color, ethnicity or national origin, age, disability, religion, sexual orientation, gender identity or expression, veteran status, or any other applicable characteristics protected by law. Apex aims to make apexcos.com accessible to all users. If you have a disability or special need that requires accommodation to navigate our website or complete the application process, please contact Talent@apexcos.com or (301) 417-0200. Likewise, feel free to reach out to us if you would like to view or discuss Apex policy related to equal employment opportunity or have any related concerns. EO/AA/VEV/Disabled Employer

TO ALL RECRUITMENT AGENCIES: Apex Companies does not accept unsolicited agency resumes. Please do not forward resumes for any of our job postings to our career’s sites, or to any employees of Apex Companies or affiliates. Apex Companies is not responsible for any fees related to unsolicited resumes.