Sewage backups pose serious health risks due to exposure to harmful bacteria and pathogens. After remediation, sewage contamination testing is essential to confirm that cleanup efforts were effective.
Essential Bacterial Tests for Sewage Contamination
Testing for indicator bacteria is the most practical and cost-effective way to verify successful cleanup.
Key Indicator Bacteria
- Total Coliforms – General indicators of contamination.
- Fecal Coliforms & E. coli – Indicators of sewage contamination.
- Enterococcus – Provides additional confirmation of contamination.
When to Test for Sewage Contamination
Pre-Cleanup Testing (Optional)
Helps document contamination severity and guide remediation strategies.
Post-Cleanup Testing (Essential)
Ensures that contamination has been effectively removed. Testing should be done 24–48 hours after final disinfection.
Where to Test for Sewage Contamination
- Directly Contaminated Surfaces – Flooring, walls, bathroom fixtures.
- Low-Elevation Points – Basements, floor drains.
- Control Samples – Unaffected areas for comparison.
Best Practices for Sampling Sewage Contamination
Surface Swab Method
- Wear protective gloves.
- Identify a 100 cm² test section.
- Use sterile swabs (rayon preferred).
- Swab thoroughly and store in sterile tubes.
Proper Sample Handling
- Maintain chain of custody.
- Transport to a certified laboratory promptly.
Why Hire Professional Testing Services?
- Fast Response – Many firms respond within 24 hours.
- Comprehensive Assessment – Includes moisture and air quality testing.
- Accurate Results – Certified labs ensure quality.
Final Thoughts
After a sewage contamination event, testing for total coliforms, fecal coliforms, and E. coli is the best way to verify successful remediation.
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