Only one previous study assessed the ability of a group of pathologists to attribute a histological subtype to a number of invasive carcinomas. The study conducted by the European working group found that subtyping was most consistent for mucinar carcinoma, followed by lobular carcinoma and at least consistent for medullary carcinoma11. The low reproducibility for the diagnosis of invasive lobular cancer compared to duocephalic and mucular tumours has been found by others and appears to be due to (1) a tendency to overdiagnosis of lobular cancer; (2) Confusion about the diagnostic criteria of the pleomorphic subtype and (3) of suboptimal histology20 The moderate degree of the Interobserver agreement for spinal cord cancer has been the subject of previous studies.21 22, 23 Using the criteria of Ridolfi et al.24, the current study reached 56.3% of consensus cases. These results are similar to those of others.21, 22 In our study, the field of interobserver was most important for lymphocytic infiltrates, followed by margina status and syncytial growth pattern. In addition, when co-enciating the individual histological characteristics of the spinal cord subtype, the most important link was with the described borders, followed by syncytial growth and lymphatic infiltration (data not presented). These results are similar to those of Gaffey and al23 and contrast with Pedersen et al.22, who found that the Interobserver agreement was the lowest in the description, although the authors used a three-step evaluation system for rewriting and lymphocytic infiltration. The aim of this study is therefore to assess the agreement between observers during health risk inspections and thus strengthen the field protocols for the management of the safety of the rural water supply. One of the subsidiary objectives is to quantify the uncertainty surrounding the classification of types of water sources.