Quick answer: GATE ES 2027 has 65 questions for 100 marks in 3 hours: General Aptitude carries 15 marks, Engineering Mathematics 13 marks and core Environmental Science and Engineering subjects 72 marks. The exam is a Computer Based Test conducted by IIT Madras on 6 to 21 February 2027. MCQs carry negative marking (1/3 or 2/3); MSQ and NAT questions do not. Below is the complete, official GATE ES 2027 syllabus with the section-wise structure, GATE 2026 cutoffs and a preparation plan.
📋 Table of Contents
- GATE ES 2027 overview
- Exam pattern and marks distribution
- Question types and marking scheme
- GATE ES 2027 syllabus (official)
- General Aptitude syllabus
- GATE 2026 cutoff and statistics
- Allowed second papers
- Important dates and eligibility
- Preparation strategy
- What a GATE ES score gets you
- GATE ES course, notes and test series
- FAQs
GATE Environmental Science and Engineering (ES) 2027: Overview
GATE Environmental Science and Engineering (ES) serves students from both science and engineering backgrounds who want M.Tech or PhD programmes in environmental engineering, climate and sustainability. Its nine sections range from environmental chemistry and microbiology to water and wastewater treatment, air pollution, waste management and sustainable development.
Who usually takes this paper: Students and graduates of Environmental Engineering, Civil Engineering, Chemical Engineering, and Environmental Science (B.Sc./M.Sc.).
| Particular | Details |
|---|---|
| Exam name | GATE 2027: Environmental Science and Engineering |
| Paper code | ES |
| Organising institute | IIT Madras |
| Mode | Computer Based Test (CBT), English only |
| Exam dates | 6, 7, 13, 14, 20 and 21 February 2027 (two sessions a day) |
| Duration | 3 hours (4 hours with compensatory time for eligible PwD candidates) |
| Questions / marks | 65 questions / 100 marks |
| Question types | MCQ, MSQ, NAT |
| Calculator | On-screen virtual scientific calculator only |
| Result date | 19 March 2027 |
| Score validity | 3 years |
| Official website | gate2027.iitm.ac.in |
GATE ES 2027 Exam Pattern and Marks Distribution
GATE ES 2027 has 65 questions for 100 marks in 3 hours: General Aptitude carries 15 marks, Engineering Mathematics 13 marks and core Environmental Science and Engineering subjects 72 marks.
| Section | Questions | Marks | Notes |
|---|---|---|---|
| General Aptitude (GA) | 10 | 15 | 5 × 1 mark + 5 × 2 marks |
| Engineering Mathematics | Part of 55 | 13 | Paper-specific maths questions |
| Environmental Science and Engineering (core subject) | Part of 55 | 72 | Mix of 1-mark and 2-mark questions |
| Total | 65 | 100 | 3 hours, CBT |
Question Types and Marking Scheme
| Question type | What it is | Marks | Negative marking |
|---|---|---|---|
| MCQ | Four options, exactly one correct | 1 or 2 | −1/3 for a 1-mark MCQ, −2/3 for a 2-mark MCQ |
| MSQ | Four options, one or more correct; full marks only for the exact correct combination | 1 or 2 | None (and no partial marks) |
| NAT | Numerical answer typed on a virtual keypad (integer or decimal) | 1 or 2 | None (and no partial marks) |
GATE questions test four abilities: Recall, Comprehension, Application, and Analysis and Synthesis. For NAT answers, round off only at the final step, to the number of decimal places asked in the question.
GATE ES 2027 Syllabus (Official, IIT Madras)
The GATE 2027 syllabus has been revised for most papers, so use this version rather than older lists. Here is the section-wise summary of the GATE ES 2027 syllabus, followed by the complete official topic list as published in Appendix D of the GATE 2027 Information Brochure.
| # | Section |
|---|---|
| 1 | Mathematics Foundation |
| 2 | Environmental Chemistry |
| 3 | Environmental Microbiology |
| 4 | Water Resources and Environmental Hydraulics |
| 5 | Water & Wastewater Treatment and Management |
| 6 | Air and Noise Pollution |
| 7 | Solid and Hazardous Waste Management |
| 8 | Global and Regional Environmental Issues |
| 9 | Environmental Management and Sustainable Development |
Complete GATE ES 2027 syllabus: topic-wise
Section 1: Mathematics Foundation
Linear Algebra: Determinants and matrices, Systems of linear equations, Eigenvalues and eigenvectors.
Calculus: Functions, Limit, Continuity, Differentiability, Local maxima and minima, Taylor series, Tests for convergence, Definite and indefinite integrals, Application of definite integral to obtain area and volume, Partial and total derivatives, Linear and non-linear first order ordinary differential equations (ODE).
Numerical Methods: Approximation, errors, accuracy and precision in numerical methods; Numerical solutions (roots) of linear and non-linear algebraic equations; Interpolation and curve fitting – Least square approximation, Newton’s and Lagrange polynomials; Numerical differentiation and integration – trapezoidal and Simpson’s rule; Numerical solution of ordinary differential equations – single and multi-step methods.
Probability and Statistics: Descriptive statistics, Measurement of central tendency, Dispersion, Skewness and kurtosis, Probability concepts, Conditional probability, Bayes theorem, Risk and reliability, Probability distributions, Correlation, Single and multiple regression models, Hypothesis testing (t-test, F-test, chi-square test).
Section 2: Environmental Chemistry
Fundamentals of Environmental Chemistry: Covalent and ionic bonding; Chemical equations, concentration and activity; Structure and chemistry of organic molecules; Chemical equilibria; Thermodynamics and kinetics of chemical reactions.
Principles of Water Chemistry: Water quality parameters and their measurement; Acid-base equilibria; Buffer solution; Carbonate equilibrium; Solubility of gases in water; Complexation, precipitation, and redox reactions; Inorganic and organic contaminants.
Soil Chemistry: Organic matter, nitrogen, phosphorous, potassium, cation exchange capacity, base saturation, and sodium absorption ratio.
Atmospheric Chemistry: Composition of the atmosphere; Reactivity of trace substances in the atmosphere; Chemistry of ozone formation.
Section 3: Environmental Microbiology
Prokaryotic and Eukaryotic Microorganisms: Characteristics of diverse groups of microorganisms; Classification of microorganisms; Microbial diversity; Role of microorganisms in wastewater treatment, bioremediation and biogeochemical cycling.
Cell Chemistry and Cell Biology: Structure of proteins, nucleic acid (DNA & RNA), lipids and polysaccharides; Structure of cell; Structure and function of cytoplasmic membrane, cell wall, outer membrane, glycocalyx; antimicrobial resistance, quorum sensing.
Microbial Metabolism: Anabolism and catabolism; Phosphorylation; Glycolysis; TCA cycle; Electron transport chain; Fermentation; Anaerobic respiration; Energy balances; Enzymes and Enzyme kinetics.
Growth and Control of Microorganisms: Bacterial nutrition and growth; Specific growth rate and doubling time; Monod’s model; Types of culture media; Batch and continuous culture; Effects of environmental factors on growth; Control of microbes using physical and chemical methods.
Microbiology and Health: Pathogens and modes of transmission; Indicator organisms; Quantification of coliforms using MPN and membrane filtration techniques.
Section 4: Water Resources and Environmental Hydraulics
Global Water Resources: Structure, properties and distribution of water; Threats to water resources; Water conservation.
Surface Water Resources: Hydrological cycle and water balance – precipitation, infiltration, evapotranspiration, runoff; Flow hydrographs; Unit hydrographs; Stage-discharge relationship; Reservoir capacity; Surface water management; Rain water harvesting and storage.
Groundwater Resources: Geologic formations as aquifers; Vadose and saturated zones; Confined and unconfined aquifers and their parameters – porosity, permeability, transmissivity and storage coefficient; Darcy’s law and applications; Steady state well hydraulics.
Environmental Hydraulics: Concepts of mechanics; Properties of fluids; Pressure measurement; Hydrostatic force on surfaces; Buoyancy and flotation; Laminar and turbulent flow; Flow through pipes; Pipe networks; Forces on immersed bodies; Flow measurement in channels and pipes; Kinematics of flow; Continuity, momentum and energy equations; Channel hydraulics – specific energy, critical flow, hydraulic jump, rapid and gradually varied flow; Design of lined channels.
Section 5: Water & Wastewater Treatment and Management
Water and wastewater quality parameters; Eutrophication and thermal stratification in lakes; River pollution – Oxygen sag curve.
Water treatment methods – screening, sedimentation with and without coagulation, filtration, desalination, disinfection; Water distribution and storage.
Point and non-point sources of wastewater; Population forecasting methods; Design of sewer and storm water sewers; Sewer appurtenances; Preliminary, primary, secondary and tertiary sewage treatment; Sludge generation, processing and disposal methods; Sewage farming.
Sources and characteristics of industrial effluents; Concept of Common Effluent Treatment Plants (CETP); Wastewater recycling and zero liquid discharge.
Kinetics and reactor design: Mass and energy balance, Order and rate of reactions, Batch reactors, Completely mixed flow reactors, Plug flow reactors.
Section 6: Air and Noise Pollution
Structure and composition of the atmosphere; sources (natural and anthropogenic); Atmospheric processes (emission, transformation, transport, removal); Indoor air pollution; Effects on health and environment; Air pollution: gases and particulate matter; Air quality standards; Primary and secondary pollutants; Criteria pollutants; primary and secondary pollutants; ambient and emission standards; air quality indices; visibility and radiative effects.
Particulate Pollutants: Measurement and control methods; Control of particulate air pollutants using gravitational settling chambers, cyclone separators, wet scrubbers, fabric filters (Baghouse filter), electrostatic precipitators (ESP).
Gaseous Pollutants: Measurement and control methods; Control of gaseous contaminants: absorption, adsorption, condensation and combustion; Control of sulphur oxides, nitrogen oxides, carbon monoxide, and hydrocarbons; Diffusion, Fick’s law and interfacial mass transfer. Vehicular emission control systems, including diesel particulate filters (DPFs), catalytic converters, and fuel standards.
Air Quality Management: Point, line and area sources; Inventory; Meteorology and dispersion; atmospheric stability and inversion, mixing height, wind rose diagrams, Gaussian plume dispersion modelling, and topographic influences.
Noise Pollution: Sources; Health effects; Standards; Measurement parameters (sound pressure level, equivalent continuous sound level Leq, day-night level Ldn); frequency analysis; and control and mitigation methods.
Section 7: Solid and Hazardous Waste Management
Integrated solid waste management; Waste hierarchy; Rules and regulations for solid waste management in India.
Municipal solid waste management: Sources, generation, characteristics, collection, segregation, and transportation, waste processing and disposal (including reuse options, biological methods, energy recovery processes and landfilling), waste-to-energy technologies, circular economy principles, life-cycle energy analysis, decentralized renewable systems, and urban metabolism.
Hazardous waste management: Characteristics, generation, fate of materials in the environment, treatment and disposal. Soil contamination and leaching of contaminants into groundwater.
Management of biomedical waste, plastic waste, waste from energy sector (solar/wind/batteries etc), C&D waste and E-waste: Sources, generation and characteristics; Waste management practices including storage, collection and transfer.
Section 8: Global and Regional Environmental Issues
Global effects of air pollution: Greenhouse gases, radiative forcing and global warming potential (GWP), climate change, urban heat islands, acid rain, ozone hole.
Ecology and various ecosystems; Biodiversity; Factors influencing increase in population, energy consumption, and environmental degradation.
Section 9: Environmental Management and Sustainable Development
Environmental Management Systems; ISO14000 series; Environmental Auditing: Environmental Impact Assessment; Life cycle assessment; Human health risk assessment; Occupational Health and Hygiene, Physical & Chemical Hazards.
Environmental Law and Policy: Objectives; Polluter pays principle, Precautionary principle; The Water and Air Acts with amendments; The Environment (Protection) Act (EPA) 1986; National Green Tribunal Act, 2010; National Environment Policy; Principles of International Law and International treaties.
Energy and Environment: Energy Sources: Overview of resources and reserves; Renewable and non-renewable energy sources; Energy-Environment nexus.
Sustainable Development: Definition and concepts of sustainable development; Sustainable development goals; Hurdles to sustainability; Environment and economics; carbon pricing, emission trading, Environmental, Social, and Governance (ESG) frameworks.
General Aptitude (GA) Syllabus: 15 Marks, Common to All Papers
| Area | Topics |
|---|---|
| Verbal Aptitude | Basic English grammar, vocabulary (words, idioms, phrases in context), reading comprehension, narrative sequencing |
| Quantitative Aptitude | Data interpretation (graphs, charts, maps, tables), ratios, percentages, powers, exponents, logarithms, permutations and combinations, series, mensuration and geometry, elementary statistics and probability |
| Analytical Aptitude | Deduction and induction, analogy, numerical relations and reasoning |
| Spatial Aptitude | Translation, rotation, scaling, mirroring, assembling and grouping, paper folding, cutting and patterns in 2D and 3D |
GATE ES 2026 Cutoff, Qualifying Marks and Statistics
These are the official GATE 2026 figures for Environmental Science and Engineering from the GATE 2026 Statistical and Performance Report (IIT Guwahati). They are the best guide to what to expect in GATE ES 2027. Qualifying marks are out of 100; the qualifying GATE score for the general category is always 350.
| Paper | Registered | Appeared | Qualified | Qualified % |
|---|---|---|---|---|
| Environmental Science and Engineering (ES) | 7,341 | 5,107 | 1,136 | 22.2% |
| Paper | GEN | OBC-NCL / EWS | SC / ST / PwD |
|---|---|---|---|
| Environmental Science and Engineering (ES) | 30 | 27 | 20 |
| Paper | Highest marks | Mean of top 0.1% (or top 10) | Average marks | Std. deviation |
|---|---|---|---|---|
| Environmental Science and Engineering (ES) | 68.33 | 63.2 | 18.14 | 11.88 |
What this means for you: in GATE 2026 the average ES candidate scored 18.14 marks, while the top 0.1% averaged 63.2. Crossing the general qualifying mark of 30 puts you in the top 22% of candidates, but admissions to top IITs and PSU interview calls usually need a score far above the qualifying line.
How the qualifying marks and GATE score are calculated
For each paper, the general-category qualifying mark is max(25, min(40, μ + σ)), where μ and σ are the mean and standard deviation of the marks of all candidates who appeared. OBC-NCL/EWS qualifying marks are 90% and SC/ST/PwD qualifying marks are about two-thirds of the general value.
Your GATE score (out of 1000) is computed as Score = 350 + 550 × (M − Mq) / (M̄t − Mq), where M is your marks (normalised marks for multi-session papers), Mq is the general qualifying mark and M̄t is the mean marks of the top 0.1% or top 10 candidates, whichever is larger. A score of 350 corresponds to the qualifying mark and 900 to the top-candidate average.
Which Papers Can Be Combined with GATE ES 2027?
You may appear in one or two GATE papers. As per the tentative list in the GATE 2027 brochure, the second paper allowed with ES as the primary paper is: Biotechnology (BT), Civil Engineering (CE), Chemical Engineering (CH), Geomatics Engineering (GE). The fee for two papers is twice that of one paper.
GATE 2027 Important Dates, Fee and Eligibility
| Event | Date |
|---|---|
| Registration (regular period) | 2 to 27 September 2026 (closed) |
| Extended period with late fee | Up to 12 October 2026 (closed) |
| Special window (late fee) | 15 October 2026, 10:30 AM to 16 October 2026, 10:29 AM (closed) |
| Exam city notification | 4 January 2027 |
| Admit card | To be announced on GOAPS |
| GATE 2027 exam | 6, 7, 13, 14, 20 and 21 February 2027 |
| Result | 19 March 2027 |
Application fee per paper (regular period): ₹1,000 for female, SC, ST and PwD candidates and ₹2,000 for all others; ₹1,500 and ₹2,500 respectively in the extended period and special window.
Eligibility: candidates in the third or higher year of any undergraduate degree, or who have completed a government-approved degree in Engineering, Technology, Architecture, Science, Commerce, Arts or Humanities, are eligible. M.B.B.S./B.D.S./B.V.Sc. students from the fifth semester and M.Sc./M.A./MCA students from the first year are also eligible. There is no age limit. All dates are as per the brochure and subject to change, so always confirm on the official website.
GATE ES 2027 Preparation Strategy
- Water and Wastewater Treatment and Water Resources and Environmental Hydraulics are the largest technical sections. Master unit operations, design parameters and kinetics.
- Air and Noise Pollution is formula-driven: dispersion models, control devices and noise calculations are reliable marks.
- Environmental Chemistry and Microbiology are where science graduates gain an edge; engineers should not skip them.
- Solid and Hazardous Waste, Global Environmental Issues and Environmental Management bring recall-type questions on regulations, EIA and sustainability frameworks.
- ES had a general qualifying mark of 30 in 2026, with the topper at 68.33. A balanced 45+ is a very good score.
- Solve previous GATE papers (2007 to 2026 are available on the official website) section by section, then as timed full-length papers.
- Practise every numerical with the GATE virtual calculator, since no physical calculator is allowed.
- From December, take one full mock a week in the real interface and analyse every mistake, especially negatively marked MCQs.
What Can You Do with a GATE ES 2027 Score?
GATE ES scores are used for M.Tech/PhD admissions in environmental engineering and science, and are relevant for research fellowships and environment-sector roles that accept GATE.
Under MoE guidelines, admitting institutes give at least 70% weightage to GATE performance for M.Tech admissions with scholarship. Qualifying GATE does not by itself guarantee admission, a scholarship or a job; each institute and employer applies its own criteria.
GATE ES 2027 Course, Notes and Test Series
Get structured guidance for GATE Environmental Science and Engineering from Piyush Wairale (IIT Madras) on www.piyushwairale.com. Start with the section that is common to every paper, then build your subject preparation:
Best GATE Aptitude Test Series 2027
General Aptitude is 15 of your 100 marks in GATE ES. Topic-wise tests, full GA mocks in the real interface and solved PYQs from 2010 to 2026.
GATE Engineering Mathematics courses
Linear Algebra, Calculus and Probability and Statistics taught for GATE, for the 13-mark Engineering Mathematics section.
All GATE courses, notes and test series
Browse every GATE course, notes package and test series in the PiyushAI store.
Engineering Mathematics courses: Linear Algebra · Calculus · Probability and Statistics
GATE 2027 courses, notes and test series by Piyush Wairale (IIT Madras)
Free lessons on YouTube (@piyushwairaleiitm)
GATE ES 2027: Frequently Asked Questions
What is the GATE ES 2027 exam pattern?
GATE ES 2027 has 65 questions for 100 marks in 3 hours: General Aptitude carries 15 marks, Engineering Mathematics 13 marks and core Environmental Science and Engineering subjects 72 marks. Questions are MCQ, MSQ and NAT, and each carries 1 or 2 marks.
Is there negative marking in GATE ES 2027?
Yes, but only for MCQs. A wrong 1-mark MCQ costs 1/3 mark and a wrong 2-mark MCQ costs 2/3 mark. MSQ and NAT questions have no negative marking, and there is no partial marking for any question.
What was the GATE ES 2026 cutoff?
The GATE 2026 qualifying marks out of 100 were Environmental Science and Engineering (ES): 30 (GEN), 27 (OBC-NCL/EWS), 20 (SC/ST/PwD).
When is the GATE ES 2027 exam?
GATE 2027 will be held on 6, 7, 13, 14, 20 and 21 February 2027 in forenoon (9:30 AM to 12:30 PM) and afternoon (2:30 PM to 5:30 PM) sessions. The paper-wise schedule will be published on the official website, and results are scheduled for 19 March 2027.
Which IIT is conducting GATE 2027?
IIT Madras is the organising institute for GATE 2027. The official website is gate2027.iitm.ac.in.
Can a B.Sc. Environmental Science student write GATE ES?
Yes. B.Sc. students in the third year or higher, and M.Sc. students in the first year or higher, meet the GATE 2027 eligibility criteria.
Which second papers are allowed with GATE ES 2027?
Environmental Science and Engineering (ES) can be combined with BT, CE, CH or GE.
How long is the GATE ES 2027 score valid?
The GATE 2027 score is valid for three years from the date the results are announced.
Sources: GATE 2027 Information Brochure, IIT Madras (gate2027.iitm.ac.in); GATE 2026 Statistical and Performance Report, IIT Guwahati. Last updated 27 October 2026.
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