What hydrologists make
Median
$96,600
Bottom tenth
$64,020
Top tenth
$153,130
The national median is $96,600 a year, the bottom tenth earn $64,020 or less and the top tenth $153,130 or more, in the 2025 survey.
Hydrologist
Measure where water goes, how much there is, and what happens when there is too much or too little.
- Typical pay
- $96,600a year
- Time to qualify
- 4 to 6 yearsafter high school
- Demand
- Limited
- License needed
- Nono license to hold
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Quick answers
How much does a hydrologist make in the United States?
The median pay is about $96,600 a year. Across everyone in the job it runs from about $64,020 at the lower end to about $153,130 at the upper end. The source is listed under Sources at the end of this page.
How long does it take to become a hydrologist in the United States?
4 to 6 years after high school, on the usual route.
What does it cost to become a hydrologist?
$32,000 to $80,000 all in for tuition, fees, exams and kit. Living costs are not counted.
Do you need a license to work as a hydrologist in the United States?
No. There is no license to hold, though many employers still ask for training or a certificate.
What is the job outlook for a hydrologist in the United States?
Limited demand nationally, from government outlook data. Demand varies by region, so check your area.
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Hydrologist salary in the United States
What you earn and what it costs to get there.
Starting pay
$64,020 to $77,210
The bottom tenth and bottom quarter of hydrologists, 2025
A first job with a bachelor's degree, at a consulting firm or a state agency, usually pays in this part of the range. Field technician jobs collecting the data are a normal way in while you finish school. They are also the best way to learn what the numbers actually mean.
Federal starting pay
$40,736 to $50,460
Grades 5 and 7 of the federal GS (General Schedule) pay scale, where graduates usually start, 2026
These are the 2026 rates for areas with no higher local rate, and most cities pay more. The United States Geological Survey, the Army Corps of Engineers, the Bureau of Reclamation and the National Weather Service all hire hydrologists, and every federal posting prints its salary range.
What it costs to get there
- Four-year degree, in-state public university
- Roughly $11,000 to $15,000 a year in tuition and fees
- First two years at community college, then transfer
- Roughly $4,000 to $6,000 a year
- Master's degree, if you want research or senior roles
- 2 more years, often funded by a research or teaching assistantship
- Field gear and boots
- Usually supplied by the employer
Roughly, all in
$32,000 to $80,000
Tuition, fees, exams and kit. Not rent, food or travel
The low end is two years of community college at about $5,000 a year followed by two years at an in state public university, with field boots and gear supplied by the employer. The high end is four full years at the higher in state rate plus a master's degree you pay for yourself. Many water science master's programs waive tuition and pay a small stipend in exchange for research or teaching work, so the graduate half of this often costs close to nothing, and out of state tuition is the thing that can double the whole figure.
File the FAFSA (Free Application for Federal Student Aid). Graduate programs in the water sciences frequently waive tuition and pay a modest stipend in exchange for research or teaching work, so a master's here often costs far less than people expect.
Benefits
Federal retirement and health coverage
Government is the top employer of hydrologists in the federal survey, and that still means a real pension component plus a retirement savings plan.
Public Service Loan Forgiveness
Federal, state, city and nonprofit work counts toward this program, which cancels remaining student loans after 10 years of qualifying payments.
Field days
Not every day is a desk. Sampling wells, gauging streams and surveying floodplains are part of the job.
Work that obviously matters
Flood warnings, drinking water supply and drought planning all run on this data.
Stable funding
Water monitoring is a legal requirement in many places, so the work survives downturns better than most research.
How to become a hydrologist in the United States
The exact path from high school to qualified.
The path to becoming a hydrologist, step by step
A science degree, then a choice: go to work, or add a master's and go deeper.
- 1
High school diploma
Grade 12
Physics, chemistry, calculus and any computing class. Earth science if your school has it.
- 2
Bachelor's degree
4 years
Hydrology, watershed science, geology, environmental science or civil engineering. Look for a program that makes you do real field work, not just lectures.
- 3
Summer field work
Summers
A technician job with a state water agency, a national forest or a consulting firm. Measuring flows in waders is how you learn this field.
- 4
First job or graduate school
2 more years for a master's
The federal profile lists a bachelor's or master's degree as the usual requirement. Research and university jobs generally need a doctorate.
- 5
Certification and specialization
After several years of experience
Voluntary certification as a hydrologist, or a professional engineer license if you drift into design work.
High school courses that help you become a hydrologist
Calculus
Water moving through soil and channels is described with equations you will actually use.
Physics and chemistry
Flow is physics. Water quality is chemistry.
Computer science or statistics
Modern hydrology is mostly data analysis and modeling on a computer.
Geography
Maps, terrain and watersheds are the daily vocabulary.
Time and money, at a glance
- Years after high school
- 4 to 6
- Admission
- Normal university admission, strong math needed to survive
- Total tuition
- $32,000 to $60,000 for an in-state bachelor's, more with a master's you pay for
- Paid while training?
- Summer technician work pays, and graduate assistantships often cover tuition
Mostly unregulated, with exceptions
You do not need a license to call yourself a hydrologist in most of the country. The American Institute of Hydrology, a nonprofit founded in 1981, runs the only nationwide certification, with three levels: hydrologic technician, hydrologist-in-training and professional hydrologist, awarded after an exam covering fundamentals, surface water and groundwater. Separately, several states license professional geologists, and groundwater work can fall under that license. If your work crosses into designing dams, channels or stormwater systems, that is engineering and needs a professional engineer license instead.
Where people study
Land-grant public universities
Look at colleges of natural resources and agriculture, for example Colorado State University's Warner College of Natural Resources.
Geology and earth science departments
A geology degree with a groundwater focus is one of the most common routes in.
Civil and environmental engineering
Heavier on math, and it opens the engineering license as well.
Community college first
Finish general science and math credits cheaply, then transfer into a four-year program.
What helps you get ahead as a hydrologist
Things you don't need, but that help.
Skills that open doors
Groundwater modeling
Simulating aquifers is a specialist skill that consulting firms look for.
GIS (geographic information systems)
Mapping software is the everyday tool of this field, and being genuinely good at it makes you useful on day one.
Programming
Python or R for handling long records of gauge data. This has quietly become a hiring requirement.
Water rights and regulation
In the western states, who owns which water is a legal fight. People who understand both the science and the law are rare.
Professional engineer license
If you want to design and stamp drawings, not just analyze.
Nice-to-haves
A driver's license and comfort with trucks and boats
Getting to a gauge in a canyon is part of the job.
Swimming and water safety training
You work in and around moving water, sometimes in flood conditions.
Writing
Reports that a city council or a court can read are the actual product.
Patience for long records
Some of the best hydrology comes from 60 years of boring daily measurements.
Government, consulting or research
Three different lives. Government means steady funding, published pay, long-term monitoring and public data. Consulting means faster work, billable hours and deadlines set by clients who want a permit. Research means a doctorate, grants and teaching. Many people do two of the three over a career, and the field work you do at 22 is the thing that makes you credible in all of them.
What being a hydrologist is really like
Day to day, pros and cons, where you'd work.
What a hydrologist does day to day
Half the year it is a desk: pulling gauge records, cleaning data, running a model of how a basin responds to rain, writing the section of a report that says how likely a flood is. The other half is a truck. Drive to a stream, wade in with a flow meter, check the equipment in the gauge house, pull water samples into bottles for the lab, log it all before you lose daylight. After a big storm everything changes and somebody is asking you for numbers today.
The honest pros and cons of being a hydrologist
The good
- A 2025 median of $96,600, and a bachelor's degree is a common way in
- A real mix of outdoor field work and technical desk work
- Government employers with pensions and loan forgiveness
- Drought, flooding and water supply are not going away as problems
The hard parts
- Growth is slower than average, with about 400 openings a year nationally
- It is a small field, so jobs are scattered and you may have to move
- Senior and research roles usually need a master's or a doctorate
- Field work in cold water, mud and bad weather is genuinely unpleasant
Work life
- Typical hours
- 40 a week, longer during floods and field seasons
- Remote work
- Partly, for the modeling and reporting half
- Physical demand
- Moderate: wading, hiking, lifting equipment
- Unionized
- Some federal and state scientists are
Similar paths
- Environmental ScientistFind out what is in the air, water and soil, then write the report that makes somebody deal with it.
- GeologistRead the rock. Find the water, the metal or the fault line, and tell people what is under their feet.
- Water Resources EngineerDesign the systems that move, store, clean and hold back water. Floods, dams, storm drains, drinking water and rivers.
Things nobody tells you about being a hydrologist
Things people don't tell you.
There is water data from every state
The United States Geological Survey publishes water information collected at sites across all 50 states, covering streamflow, groundwater levels, water quality and water use. Most of it costs nothing to download.
The agency has been at this since 1879
The United States Geological Survey was created in 1879 and now employs hydrologists alongside geologists, seismologists and mapping specialists to monitor and predict how the country's water and land are changing.
A flood record only means something if it is long
Calling something a 100-year flood is a statement about probability drawn from decades of measurements at one gauge. Short records give bad answers, which is why agencies keep gauges running for generations.
How a hydrologist compares
Every list is built from the same numbers shown above, so you can see where this career sits next to the others.
More science and environment careers in the US
Earth and weather first, then the rest of the field. See every career in science and environment.
- MeteorologistRead the atmosphere with math, radar and models, then tell people what is coming and how sure you are.$99kTypical pay4 to 6 yearsTo qualifyModerateDemand
- OceanographerStudy the ocean: its currents, its chemistry, its floor and the life in it. Long schooling, real ships, and a lot of the work happens on a laptop.$102kTypical pay4 to 10 yearsTo qualifyGoodDemand
- AgronomistThe science of soil and crops. You tell farmers what to plant, what to feed it and why the yield dropped.$79kTypical pay4 to 6 yearsTo qualifyVery highDemand
- Aquaculture TechnicianRaise fish and shellfish for food. Outdoors, on the water, in a small industry the country keeps saying it wants to grow.$50kTypical pay1 to 2 yearsTo qualifyGoodDemand
- AstronomerStudy stars, planets and galaxies for a living. A median of $128,820 a year, very few jobs, and a long road through a doctorate.$129kTypical pay9 to 14 yearsTo qualifyVery highDemand
- BiochemistWork out what molecules do inside living cells, then use that to make medicines and tests.$127kTypical pay4 to 11 yearsTo qualifyVery highDemand
- BiologistStudy living things, in a lab or out in the field, and turn what you find into reports people act on.$99kTypical pay4 to 10 yearsTo qualifyGoodDemand
- ChemistFind out what something is made of, or make something that did not exist yesterday. A bachelor's degree starts you; a doctorate decides your ceiling.$91kTypical pay4 to 10 yearsTo qualifyGoodDemand
Where these numbers come from
- My Next Move: Hydrologists (19-2043.00)
- O*NET OnLine: Hydrologists (19-2043.00), national hourly and annual wages from the Bureau of Labor Statistics 2025 survey
- United States Geological Survey: Water Resources
- American Institute of Hydrology
- Office of Personnel Management: 2026 General Schedule pay, Rest of United States
- USAJOBS, the federal government's official hiring site
Last checked October 2026. Pay figures are typical full-time annual amounts in United States dollars, based on Bureau of Labor Statistics wage data and published pay scales. They vary by state, employer and experience. Tuition is for in-state students at public schools unless the card says otherwise. How every figure on this site is sourced and checked.