Turn your students into science detectives with this engaging, real-world investigation focused on forever chemicals (PFAS) and environmental contamination. In this case file activity, students analyze evidence, track chemical pathways, interrogate suspects, and build a scientific case to solve the mystery of how PFAS pollution spreads through water, soil, wildlife, and the human body.

Instead of passively reading about environmental issues, students actively investigate, analyze, and reason their way through the case using real scientific evidence. This activity blends environmental science, chemistry, critical thinking, and literacy skills into one high-interest, no-prep lesson that keeps students engaged and thinking like real scientists.

10-Part Activity Breakdown

Part 1 – Mission Briefing:
Students are introduced to the case and the growing mystery of long-lasting “forever chemicals” found in water, soil, wildlife, and people.

Part 2 – Background Reading:
Students build foundational knowledge about PFAS (forever chemicals), where they come from, and why scientists are concerned.

Part 3 – Evidence Log:
Students record key information as they examine evidence related to PFAS sources, persistence, and environmental spread.

Part 4 – Evidence Analysis:
Students summarize evidence, identify patterns, and generate scientific questions about PFAS pollution.

Part 5 – Suspect List:
Students rank possible sources of PFAS contamination (consumer products, industry, firefighting foam, landfills) and justify their reasoning.

Part 6 – Pathway Tracking:
Students trace how PFAS move from products and industrial use into water systems, soil, wildlife, and human bodies.

Part 7 – Impact Analysis:
Students analyze effects on drinking water, ecosystems, animals, and human health.

Part 8 – The Big Question:
Students explain how PFAS pollution became such a widespread environmental and health problem using evidence from the case.

Part 9 – CER Writing:
Students build a scientific argument using Claim–Evidence–Reasoning.

Part 10 – Solutions & Reflection:
Students propose real-world solutions and reflect on how science, policy, and personal choices connect to PFAS pollution.

What Students Will Learn

• What forever chemicals (PFAS) are and why they persist in the environment
• How PFAS move through water, soil, wildlife, and the human body
• Why PFAS contamination threatens ecosystems, drinking water, and human health
• How everyday products and industrial processes contribute to chemical pollution
• How to analyze data and evidence to identify patterns and draw conclusions
• How to use Claim–Evidence–Reasoning (CER) to support scientific arguments
• How to trace cause-and-effect relationships in complex environmental systems

You can find this Mystery Activity as well as the others I have created inside my Mystery Activity Bundle at a significant discount plus, it includes:

The Science Detective Bonus Toolkit: Four supplemental files to support both students and teachers in every mystery activity. It includes:

• Mystery Activity Rubric for easy grading
• Reusable Science Detective Toolkit
• CER Writing Mini-Guide
• Teacher Implementation Guide to increase rigor, strengthen scientific writing, and make implementation seamless all year long.

Perfect for:

• Environmental science units
• Human impact lessons
• Earth science & ecology
• Sub plans, review days, or project-based learning

No prep, no formatting, no issues. Simply download, print (or upload to your class site) and you're all set.

What’s Included

• Marking Rubric
• A complete student case file with guided worksheets for every step of the investigation
• 10 detailed evidence cards based on environmental research and real-world examples. Evidence cards include two versions - one with images and the other without images.
• A full teacher answer key with sample responses and support for grading

Why Teachers Love This Resource

• Fully structured and print-and-go – Everything is ready to use with clear directions and scaffolding built in.
• High engagement without extra classroom management – The detective format naturally hooks students and keeps them focused.
• Real-world relevance students care about – Topic specific and applicable.
• Builds both science and ELA skills – Includes analysis, explanation, and Claim-Evidence-Reasoning writing.
• Flexible for any schedule – Use in one class period, over two days, or as a mini-project.

Time Required

• 2 class periods
• Can be extended into a 3-day mini-project

The following Mystery Activities can be found inside my Mystery Activity Bundle.

1. The Microplastics Mystery
2. The Air Pollution Mystery
3. The Water Pollution Mystery
4. Deforestation & Habitat Destruction Mystery
5. The Biodiversity Loss Mystery
6. The Invasive Species Mystery
7. The Climate Change & Global Warming Mystery
8. The Overfishing & Ocean Ecosystem Collapse Mystery
9. The Resource Depletion & Mining Mystery
10. The Urban Sprawl Mystery
11. The Landfill & Waste Crisis Mystery
12. The Freshwater Crisis Mystery
13. The Agriculture & Fertilizer Runoff Mystery
14. The Fossil Fuels & Energy Crisis Mystery
15. The Fast Fashion & Consumerism Mystery
16. The E-Waste & Technology Pollution Mystery
17. The Ocean Acidification Mystery
18. The Forever Chemicals Mystery
19. The Light Pollution Mystery
20. The Urban Heat Island Mystery

Google Classroom and Distance Learning Ready

• This resource is perfect for in-class or distance learning and integrates seamlessly with Google Classroom.
• Automatically creates a copy of the reading and puts it directly into your Google Drive with a single click.
• Purchase --> Open --> Click --> Assign to your students
• The reading also includes a Microsoft Word and PDF version.

Having all three options allow you to assign the reading to your students without worrying about formatting issues as all the work has already been done for you. It also allows you, as well as your students, to access everything no matter where you are or what kind of equipment is being used.

No prep, no formatting, no issues. Simply download, print (or upload to your class site) and you're all set.

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If you have any questions please feel free to send me an email - devon@teachwithfergy.com