Virginia Tech engineering Professor Marc Edwards, who first drew national attention to the water crisis in Flint, Michigan, listens after accepting the inaugural Disobedience Award during "Defiance!" at Massachusetts Institute of Technology (MIT) in Cambridge, Massachusetts, U.S., July 21, 2017. REUTERS/Brian Snyder 

Virginia Tech engineering Professor Marc Edwards (L) and Dr. Mona Hanna-Attisha of Michigan's Hurley Medical Center, who first drew national attention to the water crisis in Flint, Michigan, accept the inaugural Disobedience Award during "Defiance!" at Massachusetts Institute of Technology (MIT) in Cambridge, Massachusetts, U.S., July 21, 2017. REUTERS/Brian Snyder 

Reid Hoffman (L), co-founder of LinkedIn, presents the inaugural Disobedience Award to Virginia Tech engineering Professor Marc Edwards (C) and Dr. Mona Hanna-Attisha of Michigan's Hurley Medical Center, who first drew national attention to the water crisis in Flint, Michigan, during "Defiance!" at Massachusetts Institute of Technology (MIT) in Cambridge, Massachusetts, U.S., July 21, 2017. REUTERS/Brian Snyder 

Kelly Flint of the Remi Vista Foster Care Agency organizes donated water at a Red Cross relief center in Chico, California, after an evacuation was ordered for communities downstream from the Lake Oroville Dam, in Oroville, California, U.S. February 13, 2017. REUTERS/Beck Diefenbach 

Michigan Attorney General William "Bill" Schuette speaks as federal officials announce the indictment of the New England Compounding Center (NECC) in Boston, Massachusetts, December 17, 2014. Schuette said June 22, 2106 that his office has sued two engineering services companies for negligence and fraud for their involvement in the city of Flint's water crisis. REUTERS/Dominick Reuter/File Photo 

U.S. President Barack Obama returns to the White House in Washington after a visit to Flint, Michigan, to address that city's water crisis, May 4, 2016. REUTERS/James Lawler Duggan 

Demonstrators protest over the Flint, Michigan contaminated water crisis with signs referencing Michigan Governor Rick Snyder outside of the venue where the Democratic U.S. presidential candidates' debate was being held in Flint, Michigan, March 6, 2016. REUTERS/Rebecca Cook 

Demonstrators protest over the Flint, Michigan contaminated water crisis outside of the venue where the Democratic U.S. presidential candidates' debate was being held in Flint, Michigan, March 6, 2016. REUTERS/Rebecca Cook 

Demonstrators protest over the Flint, Michigan contaminated water crisis outside of the venue where the Democratic U.S. presidential candidates' debate was being held in Flint, Michigan, March 6, 2016. REUTERS/Rebecca Cook 

Latoya Ervin puts a blood sample into a machine to test for lead poison levels at a clinic set up to help screen for the effects of the crisis when the city's drinking water became contaminated with dangerously high levels of lead in Flint, Michigan, March 6, 2016. REUTERS/Jim Young

Latoya Ervin is seen through a window as she conducts blood sample tests for lead poison levels at a clinic set up to help screen for the effects of the crisis when the city's drinking water became contaminated with dangerously high levels of lead in Flint, Michigan, March 6, 2016. REUTERS/Jim Young

Brandon Fant (L) gets his blood tested for lead poison levels by Lashae Campbell at a clinic set up to help screen for the effects of the crisis when the city's drinking water became contaminated with dangerously high levels of lead in Flint, Michigan, March 6, 2016. REUTERS/Jim Young

Lagretta Hinton (C) gets her blood tested for lead poison levels by Lashae Campbell at a clinic set up to help screen for the effects of the crisis when the city's drinking water became contaminated with dangerously high levels of lead in Flint, Michigan, March 6, 2016. REUTERS/Jim Young 

Teosha Timmons waits for the results of a blood test for lead poison levels at a clinic set up to help screen for the effects of the crisis when the city's drinking water became contaminated with dangerously high levels of lead in Flint, Michigan, March 6, 2016. REUTERS/Jim Young

Brandon Fant (L) gets his blood tested for lead poison levels by Lashae Campbell at a clinic set up to help screen for the effects of the crisis when the city's drinking water became contaminated with dangerously high levels of lead in Flint, Michigan, March 6, 2016. REUTERS/Jim Young

Lagretta Hinton (C) gets her blood tested for lead poison levels by Lashae Campbell as she holds her grandson Shawn Bozier at a clinic set up to help screen for the effects of the crisis when the city's drinking water became contaminated with dangerously high levels of lead in Flint, Michigan, March 6, 2016. REUTERS/Jim Young

Volunteers distribute bottled water to help combat the effects of the crisis when the city's drinking water became contaminated with dangerously high levels of lead in Flint, Michigan, March 5, 2016. REUTERS/Jim Young

Volunteers distribute bottled water to help combat the effects of the crisis when the city's drinking water became contaminated with dangerously high levels of lead in Flint, Michigan, March 5, 2016. REUTERS/Jim Young

Volunteers distribute bottled water to help combat the effects of the crisis when the city's drinking water became contaminated with dangerously high levels of lead in Flint, Michigan, March 5, 2016. REUTERS/Jim Young TPX IMAGES OF THE DAY

Volunteers distribute bottled water to help combat the effects of the crisis when the city's drinking water became contaminated with dangerously high levels of lead in Flint, Michigan, March 5, 2016. REUTERS/Jim Young

Volunteers distribute bottled water to help combat the effects of the crisis when the city's drinking water became contaminated with dangerously high levels of lead in Flint, Michigan, March 5, 2016. REUTERS/Jim Young

Democratic U.S. presidential candidate Hillary Clinton takes a question from a woman who compared the poor quality of her water with the water crisis in Flint, Michigan, during a forum at Denmark-Olar Elementary School in Denmark, South Carolina February 12, 2016. REUTERS/Jonathan Ernst 

Dr. Mona Hanna-Attisha testifies before the House Democratic Steering and Policy Committee on the Flint, Michigan lead water crisis in Washington February 10, 2016. Michigan Governor Rick Snyder on Wednesday will ask the state legislature for another $195 million to restore safe drinking water in Flint and help residents affected by lead-contaminated water, a spokesman confirmed on Tuesday. REUTERS/Gary Cameron 

Dr. Mona Hanna-Attisha testifies before the House Democratic Steering and Policy Committee on the Flint, Michigan lead water crisis in Washington February 10, 2016. Michigan Governor Rick Snyder on Wednesday will ask the state legislature for another $195 million to restore safe drinking water in Flint and help residents affected by lead-contaminated water, a spokesman confirmed on Tuesday. REUTERS/Gary Cameron 

Flint, Michigan Mayor Karen Weaver awaits to testify before the House Democratic Steering and Policy Committee on the Flint lead water crisis in Washington February 10, 2016. Michigan Governor Rick Snyder on Wednesday will ask the state legislature for another $195 million to restore safe drinking water in Flint and help residents affected by lead-contaminated water, a spokesman confirmed on Tuesday. REUTERS/Gary Cameron 

Flint, Michigan Mayor Karen Weaver awaits to testify before the House Democratic Steering and Policy Committee on the Flint lead water crisis in Washington February 10, 2016. Michigan Governor Rick Snyder on Wednesday will ask the state legislature for another $195 million to restore safe drinking water in Flint and help residents affected by lead-contaminated water, a spokesman confirmed on Tuesday. REUTERS/Gary Cameron 

Dr. Mona Hanna-Attisha testifies before the House Democratic Steering and Policy Committee on the Flint, Michigan lead water crisis in Washington February 10, 2016. Michigan Governor Rick Snyder on Wednesday will ask the state legislature for another $195 million to restore safe drinking water in Flint and help residents affected by lead-contaminated water, a spokesman confirmed on Tuesday. REUTERS/Gary Cameron 

House Minority Leader Nancy Pelosi (D-CA) speaks with other representatives before chairing the House Democratic Steering and Policy Committee on the Flint, Michigan lead water crisis in Washington February 10, 2016. REUTERS/Gary Cameron 

Flint, Michigan Mayor Karen Weaver (L) talks with Flint School District Superintendent Bilal Kareem Tawwab (R) before testifying at the House Democratic Steering and Policy Committee on the Flint lead water crisis in Washington February 10, 2016. Michigan Governor Rick Snyder on Wednesday will ask the state legislature for another $195 million to restore safe drinking water in Flint and help residents affected by lead-contaminated water, a spokesman confirmed on Tuesday. REUTERS/Gary Cameron 

Flint, Michigan Mayor Karen Weaver (L) talks to Flint School District Superintendent Bilal Kareem Tawwab (R) before testifying at the House Democratic Steering and Policy Committee on the Flint lead water crisis in Washington February 10, 2016. Michigan Governor Rick Snyder on Wednesday will ask the state legislature for another $195 million to restore safe drinking water in Flint and help residents affected by lead-contaminated water, a spokesman confirmed on Tuesday. REUTERS/Gary Cameron 

Flint, Michigan Mayor Karen Weaver awaits to testify before the House Democratic Steering and Policy Committee on the Flint lead water crisis in Washington February 10, 2016. Michigan Governor Rick Snyder on Wednesday will ask the state legislature for another $195 million to restore safe drinking water in Flint and help residents affected by lead-contaminated water, a spokesman confirmed on Tuesday. REUTERS/Gary Cameron 

Democratic Presidential candidate Hillary Clinton (L) and Flint Mayor Karen Weaver (R) are introduced to the congregation at House of Prayer Missionary Baptist Church before Clinton spoke about the Flint water crisis in Flint, Michigan, February 7, 2016. REUTERS/Rebecca Cook 

Democratic presidential candidate Hillary Clinton (R) and Pastor Kenneth L. Stewart pose for a photo at the House of Prayer Missionary Baptist Church where Clinton spoke to the congregation about the Flint water crisis in Flint, Michigan, February 7, 2016. REUTERS/Rebecca Cook 

Democratic Presidential candidate Hillary Clinton (C) and Flint Mayor Karen Weaver (R) are introduced to the congregation at House of Prayer Missionary Baptist Church before Clinton spoke about the Flint water crisis in Flint, Michigan, February 7, 2016. REUTERS/Rebecca Cook 

Democratic presidential candidate Hillary Clinton (2nd R) and Flint Mayor Karen Weaver are introduced to the congregation at House of Prayer Missionary Baptist Church before Clinton spoke about the Flint water crisis in Flint, Michigan February 7, 2016. REUTERS/Rebecca Cook 

Democratic presidential candidate Hillary Clinton (L) and Flint Mayor Karen Weaver are introduced to the congregation at House of Prayer Missionary Baptist Church before Clinton spoke about the Flint water crisis in Flint, Michigan February 7, 2016. REUTERS/Rebecca Cook 

Democratic presidential candidate Hillary Clinton (R) talks about the Flint water crisis with Flint Mayor Karen Weaver and local officials at the House of Prayer Missionary Baptist Church after addressing the congregation in Flint, Michigan February 7, 2016. REUTERS/Rebecca Cook 

Democratic presidential candidate Hillary Clinton is greeted by local pastors at the House of Prayer Missionary Baptist Church after addressing the congregation about the Flint water crisis in Flint, Michigan February 7, 2016. REUTERS/Rebecca Cook 

Democratic presidential candidate Hillary Clinton (C ) arrives at the House of Prayer Missionary Baptist Church to address the congregation about the Flint water crisis in Flint, Michigan February 7, 2016. REUTERS/Rebecca Cook 

Democratic presidential candidate Hillary Clinton (C ) touches the hand of Flint Mayor Karen Weaver as congressman Dan Kildee (D-MI) watches after Clinton spoke about the Flint water crisis at a church in Flint, Michigan February 7, 2016. REUTERS/Rebecca Cook 

Democratic presidential candidate Hillary Clinton (R ) touches the hand of Flint Mayor Karen Weaver after speaking about the Flint water crisis at a church in Flint, Michigan February 7, 2016. REUTERS/Rebecca Cook 

Democratic presidential candidate Hillary Clinton talks with a parishioner after addressing the congregation about the Flint water crisis at the House of Prayer Missionary Baptist Church in Flint, Michigan February 7, 2016. REUTERS/Rebecca Cook 

A parishioner is photographed with Democratic presidential candidate Hillary Clinton after she addressed the congregation about the Flint water crisis at the House of Prayer Missionary Baptist Church in Flint, Michigan February 7, 2016. REUTERS/Rebecca Cook 

Parishioners attending church service wait for Democratic presidential candidate Hillary Clinton to address the congregation about the Flint water crisis at the House of Prayer Missionary Baptist Church in Flint, Michigan February 7, 2016. REUTERS/Rebecca Cook 

Parishioners attending church service wait for Democratic presidential candidate Hillary Clinton to address the congregation about the Flint water crisis at the House of Prayer Missionary Baptist Church in Flint, Michigan February 7, 2016. REUTERS/Rebecca Cook 

Democratic presidential candidate Hillary Clinton addresses the congregation about the Flint water crisis at the House of Prayer Missionary Baptist Church in Flint, Michigan February 7, 2016. REUTERS/Rebecca Cook 

Democratic presidential candidate Hillary Clinton addresses the congregation about the Flint water crisis at the House of Prayer Missionary Baptist Church in Flint, Michigan February 7, 2016. REUTERS/Rebecca Cook TPX IMAGES OF THE DAY

Democratic presidential candidate Hillary Clinton addresses the congregation about the Flint water crisis at the House of Prayer Missionary Baptist Church in Flint, Michigan February 7, 2016. REUTERS/Rebecca Cook 

A "Water Pickup" sign points to a bottled water distribution center for Flint residents at a fire station in Flint, Michigan January 13, 2016. The Federal Bureau of Investigation said on Tuesday it was joining a criminal investigation of lead-contaminated drinking water in Flint, Michigan, exploring whether laws were broken in a crisis that has captured international attention. Picture taken January 13, 2016. REUTERS/Rebecca Cook 

Water faucet filters are distributed to Flint residents at a distribution center in a fire station in Flint, Michigan January 13, 2016. The Federal Bureau of Investigation said on Tuesday it was joining a criminal investigation of lead-contaminated drinking water in Flint, Michigan, exploring whether laws were broken in a crisis that has captured international attention. Picture taken January 13, 2016. REUTERS/Rebecca Cook 

The front of the Flint Water Plant is seen in Flint, Michigan January 13, 2016. The Federal Bureau of Investigation said on Tuesday it was joining a criminal investigation of lead-contaminated drinking water in Flint, Michigan, exploring whether laws were broken in a crisis that has captured international attention. Picture taken January 13, 2016. REUTERS/Rebecca Cook 

The front of the Flint Water Plant is seen in Flint, Michigan January 13, 2016. The Federal Bureau of Investigation said on Tuesday it was joining a criminal investigation of lead-contaminated drinking water in Flint, Michigan, exploring whether laws were broken in a crisis that has captured international attention. Picture taken January 13, 2016. REUTERS/Rebecca Cook TPX IMAGES OF THE DAY

U.S. Senator Gary Peters (D-MI) (center L) and Senator Debbie Stabenow (D-MI) (center R) lead a news conference about potential legislation in response to the water crisis in Flint, Michigan, at the U.S. Capitol in Washington January 28, 2016. A coalition of Flint, Michigan, residents and national advocacy groups on Wednesday added a new front to the ongoing legal battle over the city's water crisis, filing a lawsuit seeking to compel the city and state officials to replace the lead pipes that carry the municipal water supply. REUTERS/Jonathan Ernst 

U.S. Senator Gary Peters (D-MI) (3rd R) addresses a news conference about potential legislation in response to the water crisis in Flint, Michigan, with Senator Chuck Schumer (D-NY) (L-R), Senator Chris Coons (D-DE) and Senator Debbie Stabenow (D-MI), at the U.S. Capitol in Washington January 28, 2016. A coalition of Flint, Michigan, residents and national advocacy groups on Wednesday added a new front to the ongoing legal battle over the city's water crisis, filing a lawsuit seeking to compel the city and state officials to replace the lead pipes that carry the municipal water supply. REUTERS/Jonathan Ernst 

U.S. Senator Debbie Stabenow (D-MI) (3rd R) leads a news conference about potential legislation in response to the water crisis in Flint, Michigan, with Senator Chuck Schumer (D-NY) (L-R), Senator Bob Casey (D-PA) and Senator Gary Peters (D-MI), at the U.S. Capitol in Washington January 28, 2016. A coalition of Flint, Michigan, residents and national advocacy groups on Wednesday added a new front to the ongoing legal battle over the city's water crisis, filing a lawsuit seeking to compel the city and state officials to replace the lead pipes that carry the municipal water supply. REUTERS/Jonathan Ernst 

The top of a water tower at the Flint Water Plant is seen in Flint, Michigan January 13, 2016. Michigan National Guard members were set to arrive in Flint as soon as Wednesday to join door-to-door efforts to distribute bottled water and other supplies to residents coping with the city's crisis over lead-contaminated drinking water. REUTERS/Rebecca Cook 

The top of a water tower is seen at the Flint Water Plant in Flint, Michigan January 13, 2016. Michigan National Guard members were set to arrive in Flint as soon as Wednesday to join door-to-door efforts to distribute bottled water and other supplies to residents coping with the city's crisis over lead-contaminated drinking water. REUTERS/Rebecca Cook 

Michigan National Guard Staff Sergeant William Phillips (R) helps distribute bottled water to Flint residents at a fire station in Flint, Michigan January 13, 2016. Michigan National Guard members were set to arrive in Flint as soon as Wednesday to join door-to-door efforts to distribute bottled water and other supplies to residents coping with the city's crisis over lead-contaminated drinking water. REUTERS/Rebecca Cook 

Michigan National Guard Staff Sergeant William Phillips (L) assists a Flint resident with bottled water at a fire station in Flint, Michigan January 13, 2016. Michigan National Guard members were set to arrive in Flint as soon as Wednesday to join door-to-door efforts to distribute bottled water and other supplies to residents coping with the city's crisis over lead-contaminated drinking water. REUTERS/Rebecca Cook 

Michigan National Guard Staff Sergeant William Phillips (R) assists a Flint resident with bottled water at a fire station in Flint, Michigan January 13, 2016. Michigan National Guard members were set to arrive in Flint as soon as Wednesday to join door-to-door efforts to distribute bottled water and other supplies to residents coping with the city's crisis over lead-contaminated drinking water. REUTERS/Rebecca Cook