Lead Corrosion Dynamics in Drinking Water Systems
Summary
Lead corrosion in drinking water systems arises from electrochemical interactions between water chemistry, pipe materials and pre-existing scale. Legacy infrastructure—comprising lead service lines, lead-containing solder and brass fittings—remains widespread in many regions, posing significant health risks. Corrosion processes are governed by factors such as pH, alkalinity, dissolved oxygen, natural organic matter and disinfectant residuals, which influence the formation, composition and stability of mineral scales. Protective scales (for example, cerussite, hydrocerussite or lead phosphate phases) may form naturally or be encouraged through orthophosphate dosing, reducing lead solubility via conversion to low-solubility compounds. Conversely, polyphosphates used to control iron and calcium can complex with dissolved lead, undermining scale integrity and increasing solubility. Hydraulics, physical disturbances and galvanic interactions with other metals can trigger episodic lead release events. A comprehensive understanding of these dynamics underpins regulatory compliance, optimised corrosion control strategies and targeted public health interventions.
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Lead Corrosion Dynamics in Drinking Water Systems publication trend
The graph below shows the total number of articles in lead corrosion dynamics in drinking water systems across all publications each year (not limited to Nature Index journals).
Technical terms
Corrosion scale: Mineral deposits on pipe walls formed by metal-water reactions that can either inhibit or exacerbate lead release.
Orthophosphate: A corrosion inhibitor that promotes the formation of insoluble lead phosphate compounds on pipe surfaces.
Polyphosphate: A water treatment additive for iron and calcium control that may complex with dissolved lead, increasing its mobility.
Hydroxypyromorphite: An insoluble lead phosphate mineral (Pb5(PO4)3OH) sought after for its protective properties in corrosion control.
Lead service line: A supply pipe made of lead that connects the water main to a building and is a primary source of drinking water contamination.
References
- Estimated Childhood Lead Exposure From Drinking Water in Chicago. JAMA Pediatrics (2024).
- Effects of ortho- and polyphosphates on lead speciation in drinking water. Environmental Science Water Research & Technology (2018).
- Effectiveness of Prevailing Flush Guidelines to Prevent Exposure to Lead in Tap Water. International Journal of Environmental Research and Public Health (2018).
- The Identification and Synthesis of Lead Apatite Minerals Formed in Lead Water Pipes. Journal of Chemistry (2016).
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