Abstract
This paper reports high levels and variability in the arsenic (As) levels at locations identified as one of the highest As-contaminated locations in the world. The high levels and variability in As levels were established by a strict monitoring protocol and the minimum possible time lag between the sampling and analysis. Special sampling arrangements were created at the central-east Indian location to monitor regularly the various water quality parameters at four specific locations. Out of the four monitored locations the locations 1–3 were found contaminated on more than 90% and the public water supply source (location 4) was found contaminated on more than 38% sampling episodes as per Indian standards. If the WHO standards for As (max. 0.01 mg/L) are considered then all the inhabitants were supplied with unacceptable drinking water on ∼93% of the sampled days during the sampling period. The paper identifies many complexities in the management of As-contamination and the perils of low level contamination in the As-endemic areas.
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