U.S. Environmental Protection Agency Administrator Michael Regan joined state EPA and elected officials Thursday in visiting sites in East Palestine, Ohio, affected by the Norfolk Southern derailment which released chemicals in the small town nearly two weeks ago.Head of EPA visits East Palestine: Watch the video above."The community has questions, and they deserve answers. I want the community to know that we hear you, we see you, and that we will get to the bottom of this," Regan said in a briefing following the visit.U.S. Rep. Chris Deluzio, D-Pa., joined the site visit across the border in Ohio, representing the concerns of his constituents in Beaver County."Folks are scared. They want answers. I'm helping my constituents in Beaver County get those answers so that they can feel safe, so they know when they have concerns that are real, that are fair concerns to have, that these agencies are answering them," Deluzio told Pittsburgh's Action News 4.The EPA administrator said sophisticated equipment is continuing to be used to test the air and water in the affected area.Regan said done testing inside nearly 500 homes has not detected vinyl chloride or hydrogen chloride. The head of Ohio's Environmental Protection Agency says the wells that provide East Palestine municipal water have been tested and are safe.The U.S. EPA says those with potentially affected private wells should continue to use bottled water until those wells are tested.Regan visited the home of Kristina Ferguson, where testing continues. Ferguson is worried for her mother."We are staying at a hotel. She's 81. She has Parkinson's and COPD, and my daughter has asthma, and when you're in that house 15 minutes and you start having reactions, that home is not safe," Ferguson told Pittsburgh's Action News 4.An affected creek flows by her home."It's the other chemicals and the gases that is rising up from the creek. That's what I'm worried about. That's why I won't bring her home. I won't bring her home until that is safe. And if it's not safe, they need to let us know," Ferguson said."All families need to know that they are safe. All families deserve access to clean air and safe drinking water. I want this community to know they don't have to manage this issue on their own. As President Biden told Gov. DeWine, anything the state needs, we will be here to help," Regan said.Deluzio said he wants "to make sure that this railroad, Norfolk Southern, is held accountable. I intend to get to the bottom of how this happened, what could have prevented it, and if there's greed and negligence to blame, that we hold these people accountable."Since his visit, Deluzio said Norfolk Southern railroad told his office it will only provide family assistance resources to residents in the evacuation zone, leaving out many of his Pennsylvania constituents who live outside the zone. He's pressing for Norfolk Southern to expand that as soon as possible.In Congress, his intention is "getting to the bottom of what caused this accident, what can be changed on railroad safety, staffing levels, and this hyper-focus on profits we see in the railroads that's hurt workers and, I think, frankly weakened safety in the rail industry," Deluzio said."We are going to get through this as a team. And at the same time, we're absolutely going to hold Norfolk Southern accountable and I can promise you that," Regan said.