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Contact voltage measured in residences: implications to the association between magnetic fields and childhood leukemia

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Authors not listed · 2002

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Contact voltage in home water systems may explain the childhood leukemia-magnetic field connection through direct electrical current exposure during bathing.

Plain English Summary

Summary written for general audiences

Researchers measured magnetic fields and contact voltages in 36 Massachusetts homes, finding that voltage between water pipes and ground (VW-E) strongly correlated with residential magnetic fields, especially near power lines. This contact voltage could cause current to flow through children during baths, potentially explaining the link between high magnetic fields and childhood leukemia.

Why This Matters

This study reveals a critical mechanism that may explain one of the most troubling findings in EMF research: the association between residential magnetic fields and childhood leukemia. The science demonstrates that homes near power lines don't just have higher magnetic fields - they also have higher contact voltages in their water systems due to magnetic induction. What this means for you is that the everyday act of bathing becomes a potential exposure pathway, with electrical current flowing directly through the body when touching metal fixtures. The correlation coefficient of 0.54 between water pipe voltage and magnetic fields is statistically significant and suggests a real physical phenomenon. Put simply, this research provides a plausible biological mechanism for how magnetic fields might increase leukemia risk - not through the magnetic field itself, but through the contact current it creates in home water systems.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
Unknown (2002). Contact voltage measured in residences: implications to the association between magnetic fields and childhood leukemia.
Show BibTeX
@article{contact_voltage_measured_in_residences_implications_to_the_association_between_magnetic_fields_and_childhood_leukemia_ce2235,
  author = {Unknown},
  title = {Contact voltage measured in residences: implications to the association between magnetic fields and childhood leukemia},
  year = {2002},
  doi = {10.1002/bem.10038},
  
}
DOI: 10.1002/bem.10038PubMed: 12210565

Quick Questions About This Study

Contact voltage occurs when electrical current flows through your body when you simultaneously touch metal water fixtures and grounded appliances. This happens because magnetic fields from power lines induce voltages in home grounding systems, creating electrical pathways through plumbing.
During baths, children can complete electrical circuits between metal faucets and drains, allowing contact current to flow directly through their bodies. This provides a direct exposure pathway that bypasses the skin's natural electrical resistance.
Pittsfield provided an ideal study location with varying distances from power lines and diverse residential magnetic field levels. The 36 homes allowed researchers to measure correlations between magnetic fields and contact voltages across different exposure scenarios.
VP-W measures voltage between the service panel neutral and water grounding wire. This voltage wasn't strongly correlated with magnetic fields (r=0.28) but can still create contact current when touching water fixtures and grounded appliances simultaneously.
The correlation was statistically significant at r=0.54 (P<0.001), meaning water pipe voltage explained about 29% of the variation in residential magnetic fields. This strong relationship suggests magnetic induction from nearby power lines affects home grounding systems.