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Here are 12 critical facts about TTHM as the city's fight to reduce it continues: 1. Trihalomethanes are actually a group of four chemicals that are formed along with other disinfection byproducts when chlorine reacts with organic materials such as leaves or dirt in water, according to the U.S. Environmental Protection Agency. 2. TTHMs are odorless and colorless, according to the Michigan Department of Environmental Quality. That means the high levels of TTHM in Flint water last year are not related to problems such as discoloration and odor in tap water. 3. The four trihalomethane chemicals are chloroform, bromodichloromethane, dibromochloromethane and bromoform. 4. U.S. EPA regulates TTHM at a maximum allowable, annual, average level of 80 parts per billion. The standard has been in place since December 2001 for large public surface water systems and since December 2003 for small surface water and all groundwater systems. 5. Four of eight testing sites in Flint averaged more than the acceptable limit of 80 parts per billion of TTHM last year. 6. Testing for TTHM is done on a quarterly basis, which means that people who use the system are exposed to water for several months before public notice is required. That's because TTHM is a chronic -- not immediate --health threat, according to the DEQ. 7. U.S. EPA estimates the 80 parts per billion standard prevents an estimated 280 cases of bladder cancer each year out of a total of more than 330 million people who use public water supplies nationwide. 8. Since it started using the Flint River as its water source, three quarterly tests have produced these TTHM results in the city: 15 samples have been above the TTHM threshold. Nine samples have tested at less than 80 parts per billion. 9. The most recent quarterly test showed just one site of eight that was above the 80 parts per billion threshold. And a voluntary test of the same sites in late January by the city were all within were all within the limits. 10. The testin

"Lead leached from old pipes after the city began using the Flint River in 2014 without adding corrosion-control chemicals. Flint returned in 2015 to Detroit's water system.(...)Residents in Flint whose homes still may need new water lines due to lead contamination may have a new benefactor in Elon Musk. The tech billionaire caused a stir on Twitter Wednesday, tweeting Wednesday that he was committing to "fund fixing the water in any house" with contamination above federal levels."

DRIVER-POLITICS-INFRASTRUCTURE-TREATEMENT Criminal Charges Filed Against 6 Officials Schuette announced criminal charges against six more current and former state employees, bringing the total number of people charged to nine. Liane Shekter-Smith is the former director of the drinking water and municipal assistance office within the MDEQ. She and two subordinates, Adam Rosenthal and Patrick Cook, allegedly misled officials about Flint's water treatment plant, which was not in compliance with lead and copper rules. The other three people charged are current or former employees of the Michigan Department of Health and Human Services. The director of the child health unit, Nancy Peeler, her subordinate, Robert Scott, and a state epidemiologist Corinne Miller allegedly failed to release a report that showed unsafe lead levels in the blood of Flint children. All six are charged with misconduct in office, conspiracy, and willful neglect of duty. Rosenthal is also charged with tampering with evidence, for allegedly requesting water tests that did not show elevated lead.

DRIVER-FLINT-TREATMENT-WATER-POLLUTION-CHEMISTRY Former EPA Drinking Water Standards Director, Dr. Joseph Cotruvo developed the US Environmental Protection Agency's (EPA's) first THM Rule in 1979. I spoke with him for his perspective on TTHM in Flint's drinking water: "Scientists have studied the health effects of disinfection byproducts extensively. For example, the January 4, 2006 Federal Register,2 which announced the Stage 2 Rule, cites over 60 mixed result research studies probing the potential health effects of exposure to disinfection byproducts such as TTHM. After reviewing many studies, the Agency concluded that 'no dose response relationship or causal link has been established between exposure to chlorinated drinking water or disinfection byproducts and adverse developmental or reproductive effects.' Nevertheless, EPA takes a very precautious stand, saying the studies 'do provide an indication of a potential health concern that warrants incremental regulatory action beyond Stage 1 DBPR [Disinfectants and Disinfection Byproducts Rule].'"