Two years after Bernalillo spent at least $4.9 million building new arsenic filtration systems for the Town’s drinking water, lab tests suggest they are not working. The state Environment Department issued a violation letter Tuesday, stating that water from one of the Town’s two active wells exceeds federal and state water standards for arsenic. The violation notice came just a week after the Town council voted to spend another $9.2 million to install the system on its remaining two wells — lest it lose $4 million in federal stimulus funding for the water system improvements.