Chemical composition features of the Izhora groundwater field (Leningrad Region)

Drinking water quality is determined by the chemical composition of water and is regulated by sanitary legislation. Izhora field, located south of St. Petersburg on the Izhora Plateau, is the largest in the Leningrad region. The sediments contain fractured and karst limestones and dolomites (O1–3). The priority indicators of Ordovician aquifer quality in the Izhora groundwater field have been identified. Hardness, iron, manganese, barium, nitrates have been analyzed for assessing the Ordovician aquifer quality. A map of nitrate contamination of groundwater in the Izhora plateau has been constructed.