Wisconsin Water Testing Labs

Find EPA-certified water testing laboratories in Wisconsin. All labs listed are certified by Wisconsin Department of Natural Resources (chemistry) and Department of Agriculture, Trade, & Consumer Protection (microbiology) and meet federal standards for drinking water analysis.

State Certification Program

Wisconsin Department of Natural Resources (chemistry) and Department of Agriculture, Trade, & Consumer Protection (microbiology)

Visit Certification Program Website

Laboratory Directory

📄Access Method:

Excel spreadsheet for chemistry certifications, searchable database for microbiology

Access Wisconsin Lab Directory

💡 Local Resources & Tips

Wisconsin splits certification between two departments; State Lab of Hygiene provides comprehensive testing services

How to Use This Directory

1.Access the laboratory directory using the link above
2.Verify certifications: Confirm labs hold current state certification for the specific contaminants you want to test (bacteria, nitrate, metals, VOCs, PFAS)
3.Request pricing: Call multiple labs to compare prices and turnaround times—costs vary significantly even within the same state
4.Schedule testing: Follow lab instructions for sample collection, storage, and delivery
5.Review results: Compare detected concentrations against EPA standards and take appropriate action