Salary data is based on the Chicago-Naperville-Elgin, IL-IN-WI metropolitan area and applied to Naperville using local cost-of-living adjustments.

Hydrologists Salaries in Naperville, IL

Average Base Pay

$99,485/yr

1% above national average

Monthly

$8,290

Hourly

$48

Cost Index

113

Hydrologists in Naperville, IL earn an average of $99,485 per year, with most salaries falling between $79,588 and $119,382 depending on experience, employer, and specialization. At 1% above the national average, Naperville ranks among the higher-paying markets for this role, in part reflecting a local cost of living index of 113. 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 Naperville.

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.

$75K
Low

$99K
Median

$124K
High

25th percentile: $85K75th percentile: $114K

About Hydrologists

Environmental Scientists study the natural environment and identify how human activity affects ecosystems, air quality, water quality, and soil health. They collect environmental samples, conduct field surveys, analyze data, and prepare reports that inform regulatory compliance, remediation planning, environmental permitting, and natural resource management. In consulting, environmental scientists conduct Phase I and Phase II environmental site assessments to identify contamination at properties being acquired or sold. They oversee remediation of contaminated sites, collecting soil and groundwater samples to monitor cleanup progress against regulatory cleanup goals. Wetland scientists identify and delineate wetland boundaries for Clean Water Act permitting and assess impacts of proposed development. Air quality scientists monitor emissions, model pollutant concentrations, and prepare air permit applications. Environmental scientists also work for regulatory agencies, reviewing permit applications, conducting inspections, and enforcing environmental laws. Natural resource agencies employ them to assess habitat quality, manage wildlife populations, and evaluate the ecological impacts of proposed infrastructure projects. A bachelor's degree in environmental science, ecology, geology, or chemistry is the typical entry credential.

What Hydrologists Do

Conduct field investigations including soil, water, and air sampling
Perform Phase I and Phase II environmental site assessments
Analyze environmental data and compare against regulatory standards
Prepare technical reports for regulatory submissions and client deliverables
Delineate wetlands and assess ecological impacts of proposed projects
Monitor environmental remediation activities
Interact with regulatory agencies on permitting and compliance matters
Use GIS tools to map and analyze environmental data spatially

Key Skills & Qualifications

Field sampling techniques for soil, groundwater, and surface water
Environmental data analysis and statistical interpretation
Regulatory framework knowledge (Clean Water Act, CERCLA, RCRA)
Phase I and Phase II ESA methodology
GIS for environmental mapping and data analysis
Technical report writing for regulatory audiences
Wetland delineation methodology (USACE, HGM)
Environmental permitting processes

Career Path

Field Technician / Environmental Scientist I
Environmental Scientist
Senior Environmental Scientist
Project Manager / Principal Scientist
Director of Environmental Services

Hydrologists Market in Naperville, IL

Salary Competitiveness

Naperville salaries for Hydrologists track closely with the national median, diverging by less than 4%. This alignment suggests a competitive but balanced local market—employers are broadly in step with national pay scales, which can make benchmark comparisons more reliable when negotiating.

Cost of Living Impact

Naperville sits close to the national cost average. Monthly essential expenses represent about 50% of take-home pay for this role—a midrange ratio that allows for modest savings and discretionary spending, provided housing costs remain stable.

Effective Purchasing Power

The purchasing power of $99,485 for a Hydrologists in Naperville is moderate: enough to meet essential expenses and build incremental savings, but requiring deliberate budgeting to avoid margin erosion—especially as rent and healthcare costs have outpaced wage growth across many mid-tier markets.

vs. National Avg

+1%

Cost Pressure

50%

Purchasing Power

Moderate

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

$72,624

Monthly

$6,052

Weekly

$1,397

Eff. Tax Rate

27%

A gross salary of $99,485 for a Hydrologists in Naperville translates to roughly $6,052 in monthly take-home pay after estimated federal and state taxes. Set against monthly living costs of $3,043—covering housing, food, transportation, utilities, and healthcare—that leaves approximately $3,009 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 Naperville's current market.

How far does this salary go in Naperville?

Cost of Living in Naperville

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

Cost Index

113

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

🏠Housing / Rent$1,850/mo

🍔Food & Groceries$540/mo

🚗Transportation$140/mo

💡Utilities$175/mo

🏥Healthcare$338/mo

Monthly$3,043

Annual$36,516

Disposable Income$3,009

Financial Reality Check

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

Monthly Take-Home

$6,052

Living Costs

$3,043

Disposable

$3,009

Cost Index

113

Lifestyle

Moderate

With a monthly take-home of $6,052, your estimated living costs in Naperville are $3,043 ($36,516/yr). This leaves $3,009 per month in disposable income, indicating a moderate standard of living. Naperville's cost of living is 13% above the national average.

Overall, a Hydrologists earning $99,485 in Naperville falls into a moderate lifestyle tier and can cover essentials and hit modest savings goals, though discretionary spending warrants careful planning. With a cost index of 113, Naperville is 13% 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 Naperville continue to evolve.