Salary data is based on the Los Angeles-Long Beach-Anaheim, CA metropolitan area and applied to San Marcos using local cost-of-living adjustments.

Environmental Engineers Salaries in San Marcos, CA

Average Base Pay

$119,780/yr

16% above national average

Monthly

$9,982

Hourly

$58

Cost Index

120

Environmental Engineers in San Marcos, CA earn an average of $119,780 per year, with most salaries falling between $95,824 and $143,736 depending on experience, employer, and specialization. At 16% above the national average, San Marcos ranks among the higher-paying markets for this role, in part reflecting a local cost of living index of 120. For professionals evaluating a move or negotiating an offer, the headline salary is only part of the picture—what matters most is how far that income actually goes once taxes, rent, and daily expenses are factored in. The sections below break that down in full for San Marcos.

Salary Range

The chart below shows the full compensation spectrum for this role, from entry-level to senior positions. The highlighted center bars represent the 25th–75th percentile band where most professionals are paid.

$90K
Low

$120K
Median

$150K
High

25th percentile: $102K75th percentile: $138K

About Environmental Engineers

Environmental Engineers develop solutions to environmental problems including air and water pollution, contaminated site remediation, waste management, and sustainability. They apply engineering principles alongside biology, chemistry, and ecology to design systems that protect human health and the natural environment. In water and wastewater engineering, they design treatment plants, distribution systems, and stormwater management infrastructure. In air quality, they design emission control systems for industrial facilities and model pollutant dispersion. In contaminated site remediation, they assess the extent of soil and groundwater contamination, design cleanup systems, and oversee remediation contractors. Environmental engineers must navigate complex regulatory frameworks—Clean Air Act, Clean Water Act, RCRA, CERCLA—and often interact with federal and state environmental agencies. They prepare environmental impact assessments for development projects, conduct environmental compliance audits for industrial operations, and develop environmental management systems. Increasing focus on climate change has expanded the role into greenhouse gas accounting, carbon management, and resilience planning.

What Environmental Engineers Do

Design water and wastewater treatment systems
Develop remediation plans for contaminated soil and groundwater
Prepare air emissions inventories and design control systems
Conduct environmental compliance audits for industrial facilities
Prepare environmental impact assessments and permit applications
Interact with regulatory agencies on permitting and enforcement matters
Perform environmental site assessments (Phase I and II ESAs)
Develop stormwater management plans and pollution prevention programs

Key Skills & Qualifications

Knowledge of environmental regulations (Clean Air Act, Clean Water Act, RCRA)
Environmental modeling for air, water, and groundwater systems
Site assessment and remediation design
Environmental permitting and regulatory agency interaction
GIS for environmental data mapping
Water and wastewater treatment process design
Technical report writing for regulatory submissions
PE licensure and CHMM or other environmental certifications

Career Path

Environmental Scientist / Environmental Engineer EIT
Environmental Engineer
Senior Environmental Engineer
Principal Environmental Engineer
Director of Environmental Services

Environmental Engineers Market in San Marcos, CA

Salary Competitiveness

San Marcos is one of the stronger-paying markets for Environmental Engineers, with local salaries running approximately 16% above the national median. This premium typically reflects a combination of higher employer competition, concentrated industry presence, and elevated cost expectations built into local compensation norms.

Cost of Living Impact

The cost of living in San Marcos is well above the national average, and essential monthly expenses consume roughly 44% of take-home pay for this role. That compression means a higher gross salary buys less financial breathing room than the headline number suggests—particularly for housing, which tends to dominate the budget in high-cost markets.

Effective Purchasing Power

After adjusting for local taxes and cost of living, a Environmental Engineers earning $119,780 in San Marcos reaches a strong purchasing-power position. The effective standard of living this income supports is materially higher than the gross number alone implies—a useful data point for professionals comparing offers across metro areas.

vs. National Avg

+16%

Cost Pressure

44%

Purchasing Power

Strong

Take-Home Pay Calculator

Enter any gross salary to see how federal and state taxes affect your actual take-home pay, broken down by year, month, and week. Results use an estimated effective tax rate of 27% based on this location and income level.

Annual Salary

Take-home (73%)Taxes (27%)

Annual Net

$87,439

Monthly

$7,287

Weekly

$1,682

Eff. Tax Rate

27%

A gross salary of $119,780 for a Environmental Engineers in San Marcos translates to roughly $7,287 in monthly take-home pay after estimated federal and state taxes. Set against monthly living costs of $3,230—covering housing, food, transportation, utilities, and healthcare—that leaves approximately $4,057 per month in disposable income. That margin, not the gross number, is what determines whether you can comfortably cover rent, build savings, and afford discretionary spending in San Marcos's current market.

How far does this salary go in San Marcos?

Cost of Living in San Marcos

Estimated monthly expenses for a single person in San Marcos, benchmarked against US regional price indices for housing, food, transportation, utilities, and healthcare.

Cost Index

120

Above Avg — US average is 100. Based on a single person (1-bed apartment).

🏠Housing / Rent$1,980/mo

🍔Food & Groceries$555/mo

🚗Transportation$145/mo

💡Utilities$205/mo

🏥Healthcare$345/mo

Monthly$3,230

Annual$38,760

Disposable Income$4,057

Financial Reality Check

This section compares estimated monthly take-home pay against typical living costs in San Marcos to show your real disposable income—the amount remaining after essential bills are paid each month.

Monthly Take-Home

$7,287

Living Costs

$3,230

Disposable

$4,057

Cost Index

120

Lifestyle

Comfortable

With a monthly take-home of $7,287, your estimated living costs in San Marcos are $3,230 ($38,760/yr). This leaves $4,057 per month in disposable income, indicating a comfortable standard of living. San Marcos's cost of living is 20% above the national average.

Overall, a Environmental Engineers earning $119,780 in San Marcos falls into a comfortable lifestyle tier and has meaningful room to save, invest, and absorb unexpected expenses without financial stress. With a cost index of 120, San Marcos is 20% more expensive than the national average, which compresses real purchasing power. Regardless of tier, prioritizing retirement contributions, an emergency fund of three to six months' expenses, and incremental debt reduction will yield the greatest long-term financial stability—especially as living costs in San Marcos continue to evolve.