What the EPA’s Proposed PFAS Rollback Means for Your Capital Plan: A Shanghai ChiMay Board Briefing The Regulatory Situation in Plain Terms In May 2026, the US EPA published a proposed rule to rescind the federal drinking water standards (Maximum Contaminant Levels) for PFHxS, PFNA, HFPO-DA (GenX chemicals), and the Hazard Index mixture of those…
Using Online Turbidity as an Early-Warning Proxy for PFAS Particle Transport: Insights from Shanghai ChiMay Particle-Bound PFAS: The Overlooked Contamination Pathway PFAS monitoring programs predominantly focus on dissolved-phase PFAS—compounds freely dissolved in the water column and captured by standard 0.45 µm filtration before analysis. However, a growing body of research has demonstrated that a meaningful…
Why Reservoir Intake Turbidity Demands Continuous Monitoring Reservoir intakes are the first line of defense in drinking water treatment. Raw water turbidity at the intake sets the loading on coagulation, flocculation and filtration. When turbidity spikes—storm-driven sediment runoff, wind-induced sediment resuspension, a collapsing algal bloom—the plant has to respond immediately to keep filtered water inside…
The Economics of Intake Depth Selection Most drinking water reservoirs are equipped with multi-level intakes—typically 3–5 intake bells at different depths, allowing operators to select the source depth for raw water pumping. Despite the significant water quality variation across depths, many utilities operate their intakes at a fixed depth year-round, missing the opportunity to draw…
The Scale of China’s Source Water Monitoring Build-Out China runs the world’s largest national water quality monitoring network, spanning every province, autonomous region and municipality. The build-out over the past decade is verifiable at a few anchor points: in 2018, the country completed and networked 2,050 national-level surface water automatic monitoring stations; the 14th Five-Year…
The Non-Point-Source Challenge for Reservoir Protection Point-source pollution — discharge pipes, wastewater plants — is comparatively easy to locate, monitor and regulate. Non-point-source (NPS) pollution arrives diffusely: fertilizer washing off fields during rain, livestock waste seeping through soil into groundwater, atmospheric nitrogen deposition settling across the watershed. The scale of the problem is why every…