The groundwater reserves are depleting at an alarming rate in Punjab besides a serious decline in the quality of water at many places due to overuse of the available resources, says a study. Out of a total of 137 blocks covered under the study, only 25 have been found safe with 103 of them being overexploited, five being critical and four in a semi-critical state, says a study conducted by the Water Resources and Environment Directorate, Punjab Irrigation Department.