By Alexander Douglas |Staff Writer| The cost of this in terms of water resources is extreme. The region’s water pollution will become permanent in five to eight years and would have to be shut down, according to the study. Among water problems the California State Water Resources Board found high levels of toxic chemicals, including arsenic, thallium and nitrates in water supply wells near the wastewater disposal sites. “Arsenic and thallium are extremely dangerous chemicals. The fact that high concentrations are showing up in multiple water wells close to wastewater injection sites raises major concerns about the health and safety of nearby residents,” said Timothy Krantz, a … [Read more...] about Polluted groundwater threatens water resources