Extensive Arsenic Contamination Found in Groundwater Beneath Pakistan's Indus Plain (image) American Association for the Advancement of Science Share Print E-Mail Caption Arsenic concentrations measured in Pakistan groundwater. Arsenic exceeds the WHO guideline of 10 micrograms/liter in large parts of the Indus plain. Nearly 1,200 samples were collected for this study between 2013 and 2015. Credit Podgorski et al., Sci. Adv. 2017;3: e1700935 Usage Restrictions Please cite the owner of the material when publishing. This material may be freely used by reporters as part of news coverage, with proper attribution. Non-reporters must contact Science for permission. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.