On Sept. 21, KVOA reported: The City of Tucson is suing a company it says is responsible for toxic chemicals found in local wells. Now officials say they’re finding more contaminants.
“In the last several weeks we have found significant contamination of PFCs’ out by the Air National Guard. The EPA standard…Is 70 parts per trillion,” Tucson City Councilman Steve Kozachik said. “The contamination levels that we’re finding out by the Air National Guard are over 11,000 parts per trillion.”
Kozachik said the location of the contamination is immediately upstream of the central well field in midtown.
This video gives a simple overview of the most common types of epidemiological studies, their advantages and disadvantages. These include ecological, case-series, case control, cohort and interventional studies. It also looks at systematic reviews and meta-analysis that could include data gathering on people affected by water contamination.
The Arizona Daily Star’s Tony Davis reported on Sept. 29, 2018, that Tucson Water shut down a treatment plant after discovering it was sending water contaminated with chemical compounds to thousands of residents of downtown and the city’s west and north sides.
Shortly after making that discovery, utility officials also learned that they had mistakenly thought for some time that uncontaminated water was coming out of the plant, which has long treated south-side water pollution.
“Is it embarrassing? Yeah,” acknowledged Jeff Biggs, Tucson Water’s administrator for strategic initiatives, to the Arizona Daily Star. But, he said, the city had questioned the discrepancy in the pollution levels it was finding and reacted immediately once it learned of the mistake.
“We investigated and we made operational changes to lower the level (of contamination) that we served to the public,” Biggs said.