RESUMEN
Tirupati is one of the famous tourist places in India. So, safe drinking water is a priority. Therefore, to handle ground water contamination and to make aware the people in the area of Tirupati, in the present paper, research was conducted with the goal to estimate water quality by using physico-chemical parameters and to analyse pesticides with analytical technique Gas Chromatography-Mass Spectrometry (GC-MS) of ground water in and around Tirumala, Tirupati, located in Andhra Pradesh State of India. For this estimation, ground water samples were collected from different locations of Tirupati, i.e. Sri Padmavati Mahila Visvavidyalayam (SPMVV) (Women's University), Mallamgunta, LalBahudhur (LB) Nagar, Singalagunta, Sri Venkateshwara (SV) University, Perumallapalli, Settipalli, Akkarampalli (AK Palli), Srikrishna Nagar, Gandhipuram, Pathalaganga and Cherlopalli areas, and water quality parameters (alkalinity, pH, total hardness, chloride, calcium, potassium and silica) were tested. Based on the physico-chemical parameters obtained it can be concluded that the water was good. Tirumala Pathalaganga water was found be within the standard limits set by the World Health Organisation (WHO), so it is pure water without any contaminants. Reverse Osmosis (RO) water does not contain any contaminants; it is free from dissolved solids and ions so it is pure and clean water. Ground water sample that was collected from Tirupati area was less polluted than surface water sample, so it is pure when compared with tap water. Hence, drinking water pollution should be controlled by the proper environment management plan. Ground and surface water of this area should be treated to make it suitable for drinking and to maintain proper health conditions of people living in this area. All samples that were collected from groundwater from the fields of Settipalli area exceeded the standard limits set by the WHO and Bureau of Indian Standards (BIS), which suggests poor water quality. The present study reported the contamination status of diclorvos, methyl parathion, parathion and malathion in ground water of Tirupati in Settipalli, Andhra Pradesh, India. In agriculture, pesticides are frequently viewed as a quick, simple and low-cost option for controlling weeds and insect pests. The results obtained from the present study shall be useful in future management of the ground water in Tirupati area.