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    PFAS ‘forever chemicals’: design and risk implications for civil engineers

    March 24, 2026|

    Reviewed by Joe Ashwell

    PFAS ‘forever chemicals’: design and risk implications for civil engineers

    First reported on New Civil Engineer

    30 Second Briefing

    Per- and polyfluoroalkyl substances (PFAS) are shifting from a niche contamination issue to a core design constraint for water, wastewater and brownfield infrastructure, as regulators tighten limits on “forever chemicals” in soil and groundwater. Civil engineers are being pushed to integrate PFAS-specific measures such as high-pressure membrane treatment, granular activated carbon and specialised landfill liners into drainage, flood defence and remediation schemes. The trend signals more complex risk assessments, higher lifecycle costs and potential redesign of legacy assets where PFAS-impacted leachate or run-off was not previously considered.

    Technical Brief

    • PFAS design responses now include specifying sorptive media, advanced membranes and segregated drainage for contaminated flows.
    • Brownfield enabling works must now budget for PFAS-specific site investigation, with extra boreholes and targeted groundwater sampling.
    • Landfill and earthworks specifications are shifting towards low-permeability liners and leachate collection explicitly rated for PFAS breakthrough.
    • Safety management systems on water and wastewater projects are being updated to include PFAS exposure pathways for workers.
    • Contract documents increasingly allocate PFAS discovery risk, with provisional sums and change mechanisms for unforeseen treatment requirements.
    • A key implication for future schemes is the need to integrate PFAS hazard assessment into standard geotechnical and drainage risk registers.

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    Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.

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