Full-Time
Senior Environmental Scientist 3
Updated on 8/18/2026
Apex Companies
1,001-5,000 employees
National environmental consulting and engineering firm
Compensation Overview
$83k - $125k/yr
Fullerton, CA, USA
In Person
Bachelor's, Master's, PhD
 Architecture & Civil Engineering (1) |
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- A Bachelor of Science degree in Environmental Science, Civil Engineering, Environmental Engineering, or a related field is required.
- At least 5 years of professional work experience is required.
- Knowledge of stormwater permitting and planning, water quality monitoring, best management practices, and environmental compliance inspections is required.
- CPSWQ or CPESC certification is required.
- QSD or QSP and QISP certifications are required.
- Ability to read, interpret, and analyze plans, technical manuals, and permits is required.
- Strong analytical skills are required.
- Ability to maintain attention to detail with a high level of accuracy is required.
- Ability to write and communicate effectively is required.
- Proficiency in Microsoft Office Suite is required.
- Ability to kneel, climb, and lift up to 50 pounds is required.
- A valid California driver's license and insurable driving record are required.
- Assist municipal, utility, industrial, and commercial clients with stormwater planning and compliance efforts associated with Phase I and II Municipal Separate Storm Sewer System permits, the Construction General Permit, and Industrial General Permit.
- Interpret regulatory permits and formulate compliance strategies.
- Prepare comprehensive approaches, work plans, technical reports, and documents, including 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, Stormwater Pollution Prevention Plans, and Water Quality Management Plans.
- Execute and manage field investigations.
- Manage the workload of other Environmental Scientist staff.
- Prepare and monitor project budgets.
- Meet with clients regarding work and team performance, as well as current and future work.
- Perform construction-site and facility environmental compliance inspections, including QSP, QISP, and FOG activities.
- Conduct environmental sampling, testing, and observations involving surface water, stormwater, groundwater, wastewater, soils, and sediments.
- Make field observations and perform data measurement and collection assignments.
- Manage and analyze data through compilation, manipulation, and evaluation.
- Develop and implement monitoring and reporting plans and field studies.
- Perform regulatory and water quality data analyses.
- Participate in and lead technical presentations.
- An MS or PhD in Environmental Science, Civil Engineering, Environmental Engineering, or a related field.
- Proficiency with ArcGIS.
- OSHA 40-hour HAZWOPER training.
- Ability to maintain and calibrate environmental monitoring instruments, meters, probes, and automated sampling equipment.
Apex Companies provides environmental consulting and engineering services to public agencies and private clients across all 50 states. Its offerings include water resources management, environmental remediation, health and safety, compliance assurance, ESG advisory, and infrastructure engineering, delivering work from site assessments to managing complex projects. A key differentiator is the breadth of services across environmental, health and safety, and ESG, plus its ARTEMIS data-management platform that organizes environmental information for risk mitigation and lending. The company aims to help clients manage environmental risk, achieve regulatory compliance, and efficiently complete projects while expanding its national footprint.
Company Size
1,001-5,000
Company Stage
N/A
Total Funding
N/A
Headquarters
Rockville, Maryland
Founded
1988
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Simplify's Take
What believers are saying
- Apex earned Zweig’s 2026 Hot Firm No. 28 ranking, signaling strong growth momentum.
- Tully and CWE expanded Apex’s stormwater, civil engineering, and California footprint in 2026.
- March 2026 and February 2026 acquisitions broadened Apex’s municipal and private-market project pipeline.
What critics are saying
- Private equity ownership pressures Apex to chase integrations and leverage before 2027.
- Apex’s acquisition spree risks cultural friction and margin dilution across California, Florida, and Intermountain West.
- A single failed integration or buyer slowdown could break Apex’s roll-up story and stall growth.
What makes Apex Companies unique
- Apex combines water, environmental, and infrastructure services under one national platform.
- Morgan Stanley Capital Partners backs Apex, enabling acquisitions like Tully and CWE in 2026.
- Apex’s ARTEMIS data tools and stormwater lifecycle expertise deepen client lock-in.
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Benefits
Health Insurance
Dental Insurance
Vision Insurance
Life Insurance
Disability Insurance
401(k) Company Match
Paid Vacation
Paid Sick Leave
Relocation Assistance
Growth & Insights and Company News
6 month growth
↑ 17%1 year growth
↑ 17%2 year growth
↑ 17%Apex Companies announced the acquisition of CWE, an award-winning civil infrastructure, water resources, and environmental engineering services firm with multiple offices in California.
Adds to Core Stormwater Strength and Enhances Ability to Deliver the Full Stormwater Lifecycle in Northern California
Raincatcher, a national mergers and acquisitions advisory firm serving small to mid-size businesses, served as the exclusive sell-side advisor to AquaWorks DBO,
Bolsters Engineering Depth and Extends Operational Presence in Intermountain West
Apex Companies, LLC has acquired Weiler Engineering Corporation, a Florida-based engineering firm. This acquisition enhances Apex's engineering capabilities and strengthens its presence in Florida. Weiler Engineering, with over 45 professionals, brings expertise in civil, structural, and utilities engineering. This move follows Apex's recent acquisitions of Johnson Engineering and Water Science Associates, further expanding its services in the municipal and private markets.