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Inherent variability in lead and copper collected during standardized sampling.

Sheldon Masters1, Jeffrey Parks2, Amrou Atassi3

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Lead and copper levels in drinking water show high variability due to particulate lead release. This inherent variability impacts health risk assessment and corrosion control strategies for water utilities.

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Area of Science:

  • Environmental Science
  • Public Health
  • Water Quality

Background:

  • Variability in tap water lead and copper concentrations complicates health risk assessment.
  • Understanding this variability is crucial for evaluating the efficacy of corrosion control measures in water systems.

Purpose of the Study:

  • To determine the minimum achievable variability in lead and copper concentrations from plumbing materials.
  • To quantify lead release variability from different plumbing materials under standardized conditions.

Main Methods:

  • Standardized plumbing rigs using leaded brass, copper tube with lead solder, and lead-copper connections were deployed at five water utilities.
  • Regimented sampling protocols were employed to measure lead and copper concentrations.
  • Variability was assessed using relative standard deviation (RSD).

Main Results:

  • High variability in lead release was observed across all tested plumbing materials.
  • Leaded brass exhibited the lowest lead release variability (RSD = 31%), followed by copper-solder (RSD = 49%), and lead-copper connections (RSD = 80%).
  • The primary cause identified for high variability is the semi-random detachment of particulate lead.

Conclusions:

  • The inherent variability in lead release from plumbing materials is significant and should be acknowledged.
  • This variability necessitates explicit consideration in exposure assessments, public education initiatives, and water quality monitoring strategies.
  • Addressing particulate lead release is key to managing lead and copper variability in drinking water.