An epidemiological study that shows the effect of drinking water from a well that has been contaminated with lead from nearby chemical works.
most times you don't get epi studies that deals directly with the effect of contamination due to ethical reasons instead you will find similar materials like: investigation into outbreak of lead contamination. there was one lead poisoning (contamination) outbreak in Zamfara state in Nigeria years which was published: Association of Blood Lead Level with Neurological Features in 972 Children Affected by an Acute Severe Lead Poisoning Outbreak in Zamfara State, Northern Nigeria. that can be useful
Andrew Gelman and Jennifer Hill wrote Data Analysis using Regression and Multilevel/Hierarchical Models. On page 86 of that book they have an example pertaining to arsenic contamination of a well.
You might try searching the CDC Stacks (http://stacks.cdc.gov/). There you will find reports of investigations in Bangladesh (http://stacks.cdc.gov/view/cdc/3821), Russia (http://stacks.cdc.gov/view/cdc/3830), and Nigeria (http://stacks.cdc.gov/view/cdc/8056)(http://stacks.cdc.gov/view/cdc/13670).
In my opinion, to relevant study, it is better to approach the health services in the region to account disease. Then we will must, establishing the causal relationship between illness and the consumption of well water contaminated with lead.
maybe this publication can help you, talk about the causes and effects of lead to contaminate drinking water. (it is in spanish) http://texaswater.tamu.edu/resources/factsheets/l5452slead.pdf or you can research here http://tcebookstore.org/
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