(CNN) — The US Environmental Protection Agency is ordering Norfolk Southern to handle all necessary cleanup after its train carrying toxic chemicals derailed in East Palestine, Ohio, more than two weeks ago.

The agency said it intends to force Norfolk Southern to pay and if falls short, the company will be significantly fined, the agency said. Rotary Kiln Supporting Roller Seat

If the company fails to complete any actions as ordered by EPA, the agency will immediately step in, conduct the necessary work and then seek to compel Norfolk Southern to pay triple the cost, the agency said.

The EPA said it will exercise its strongest authority against the train's operator under CERCLA — the Comprehensive Environmental Response, Compensation, and Liability Act.

The announcement came shortly after EPA Administrator Michael Regan visited an East Palestine home, drank the tap water with Gov. Mike DeWine and updated the community on the government's response.

The EPA will have full authority to identify and offer cleaning services to all residents and businesses in the area. The agency is ordering Norfolk Southern to hold and attend community meetings and abide by the unified command structure that the EPA sets forth.

The order will be effective immediately. CNN has reached out to Norfolk Southern for comment.

[Previous story, published at 11:19 a.m. ET]

The head of the US Environmental Protection Agency returned Tuesday to the site of a toxic train wreck as weeks of anger, frustration and reports of health problems pile up in East Palestine, Ohio.

EPA Administrator Michael Regan and Gov. Mike DeWine sought to reinforce earlier assurances that the municipal water supply is safe to drink by visiting an East Palestine home and drinking water straight from the tap.

At the same time, the state was opening a new health clinic to address the growing reports of rashes, headaches, nausea and other symptoms in East Palestine after a Norfolk Southern freight train carrying vinyl chloride and other hazardous chemicals derailed on February 3 — igniting a dayslong fire, shooting black smoke in the air and leading to a release of vinyl chloride to help avert a more catastrophic explosion.

The health clinic in East Palestine will have registered nurses, mental health specialists and, at times, a toxicologist, the Ohio Department of Health said.

Medical teams from the US Centers for Diseases Control and Prevention and the US Department of Health are expected to arrive in the community as early as this week to help assess what dangers might remain.

Despite the reports of health problems, authorities have repeatedly assured residents that the air and municipal water supply in the town are safe. Crews have checked hundreds of homes and have not detected any dangerous levels of contaminants, the EPA said.

The agency said air monitoring and sampling will continue "until removal of heavily contaminated soil in the derailment area is complete and odors subside in the community."

Still, life has been upended in East Palestine as residents question the findings and whether it's safe to drink the water or breathe the air.

"It will be important to monitor people's health and the environment around the train derailment for some time to come since health impacts may not emerge until later," said Dr. Erin Haynes, an environmental health scientist at the University of Kentucky.

"We should never say we're done looking at this community for potential exposures and health impacts."

Some waterways were contaminated after the crash, killing an estimated 3,500 fish. But officials have said they believe those contaminants have been contained.

Norfolk Southern installed booms and dams to restrict the flow of contaminated water from Sulphur Run and Leslie Run — two streams where fish were found dead, the EPA said.

"The spill did flow to the Ohio River during that initial slug, but the Ohio River is very large, and it's a water body that's able to dilute the pollutants pretty quickly," Ohio Environmental Protection Agency official Tiffani Kavalec said last week.

Kavalec said the agency is pretty confident that the "low levels" of contaminants that remain are not getting passed on to water customers.

A series of pumps have been placed upstream to reroute Sulphur Run around the derailment site, Norfolk Southern said Monday.

"Environmental teams are treating the impacted portions of Sulphur Run with booms, aeration, and carbon filtration units," Norfolk Southern added. "Those teams are also working with stream experts to collect soil and groundwater samples to develop a comprehensive plan to address any contamination that remains in the stream banks and sediment."

Water intakes from the Ohio River that were shut off Sunday "as a precautionary measure" were reopened after sampling found "no detections of the specific chemicals from the train derailment," the Greater Cincinnati Water Works and Northern Kentucky Water District said Monday.

A third utility provider — Maysville utility in Kentucky — announced that it temporarily shut off water intakes from the Ohio River on Saturday, when the toxic chemicals released into the river from the derailment were expected to arrive at the water treatment intake in Kentucky, utility general manager Mark Julian said.

Water measurements have been below the level of concern, Julian said, and Maysville took precautionary measures in temporarily shutting down their Ohio River intake valve due to the public concern.

"The takeaway is that anyone along the Ohio River where the contaminants made their way can breathe a sigh of relief," he said. "There's little risk to our water supply from the train derailment site and temporarily shutting down the water treatment plant and not pulling from the river until the spill passed should give us all peace of mind."

Meanwhile, the majority of the hazardous rail cars remain at the crash site as investigators continue to probe the wreck. But about 15,000 pounds of contaminated soil and 1.1 million gallons of contaminated water have been removed from the scene, Norfolk Southern announced Monday.

The contaminated soil became a point of contention last week after a public document sent to the EPA on February 10 did not list soil removal among completed cleanup activities. It is not yet known what significance or impact the soil that was not removed before the railroad reopened on February 8 will have had on the surrounding areas.

As skepticism spreads about the safety of the air and water, some local businesses say they've seen fewer customers.

"Everybody's afraid ... They don't want to come in and drink the water," Teresa Sprowls, a restaurant owner in East Palestine, told CNN affiliate WOIO.

A stylist at a hair salon told WOIO there's no doubt the salon lost business and that customers may be worried about what may be in the water washing their hair.

"I know a lot of our businesses are already suffering greatly because people don't want to come here," local greenhouse owner Dianna Elzer told CNN affiliate WPXI.

Her husband, Donald Elzer, echoed her concerns, saying, "It's devastating. The longer it goes on, the worse it gets."

Dianna Elzer also worried about longer-term economic impacts to the community.

"Our property values — who is going to want to buy a house here now?" she told WPXI. "It's going to be a long struggle to get back to where we were."

As residents call for accountability from both Norfolk Southern and government officials, US Transportation Secretary Pete Buttigieg said he plans to visit East Palestine "when the time is right" — but did not announce a date.

He did announce Monday new efforts by the Department of Transportation to improve rail safety.

"We are accelerating and augmenting our ongoing lines of effort on rail regulation and inspection here at the US DOT, including further regulation on high hazard flammable trains and electronically controlled pneumatic brakes — rules that were clawed back under the previous administration — to the full extent of that we are allowed to under current law, and we will continue using resources from the Bipartisan Infrastructure Law to fund projects that improve rail safety," Buttigieg said.

A DOT news release said the agency will continue to press for the "Train Crew Staffing Rule," which would require a minimum of two crew members during most railroad operations. Norfolk Southern has opposed the proposed rule.

Norfolk Southern has committed millions of dollars' worth of financial assistance to East Palestine, including $3.4 million in direct financial assistance to families and a $1 million community assistance fund, among other aid, the company said.

Norfolk Southern CEO Alan Shaw posted an open letter telling East Palestine residents, "I hear you" and "we are here and will stay here for as long as it takes to ensure your safety and to help East Palestine recover and thrive."

"Together with local health officials," Shaw said, "we have implemented a comprehensive testing program to ensure the safety of East Palestine's water, air, and soil."

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