TPO and Hashimoto thyroiditis: Therefore, the aim of the current study was (i) to assess the levels of the thyroid-stimulating hormone and antibodies to thyroglobulin and thyroid peroxidase in patients with a hypothyroid form of Hashimoto’s thyroiditis of both sexes, (ii) to collect drinking water from the water supply network and individual wells of these patients, and (iii) to identify correlations between the water iodine concentration in water and these indicators in patients using drinking water from the water supply network and individual wells.