The interior is completely 100% lead-free (where the food goes), the exterior is at <0.05mg/l.
This is well below the limit legally permitted under the USA FDA approval standards for food-grade ceramic materials.
The crocks have been tested by independent lab compliant to European Commission Regulations No. 2016/1416, Regulation No 2017/752 and Regulation No. 1935/2004, USA FDA Regulations 21 CFR Part 177.1210, US FDA CPG Sec. 545.400 and CPG Sec. 545.450 Pottery(Ceramic) - Leachable Lead and Cadmium Content. There is no detectable lead on the crocks surfaces.