It’s been one week since Harvey hit Texas. Here’s what you need to know.

In Harvey's Wake

The devastation was swift, and the recovery is far from over. Sign up for our ongoing coverage of Hurricane Harvey's aftermath. 

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It’s been one week since Hurricane Harvey — which was downgraded to a tropical depression on Wednesday — hit the Texas coast. While the rainfall may be in decline, the floodwaters are only beginning to recede, and it’ll be weeks, if not months, before Houston resembles itself.

In the meantime, officials are advising private well-water owners and users to test their water for contamination and disinfect it. Local country health offices can offer water testing services or well owners can reference this list of water testing facilities approved by the state of Texas. The Texas Well Owner Network also has several resources on its website with information on how to disinfect a water well.  

In a statement Thursday, Gov. Greg Abbott announced he had sent a letter to county judges outlining the types of assistance counties can receive, and he also provided information about aid eligibility for areas affected by Harvey. "I want all Texans to know that Texas is committed to helping them through the recovery process, and we will be with them every step of the way," Abbott wrote.

Abbott has also announced he had increased the number of National Guard troops to help with Harvey to 24,000. Previously the governor had announced the full deployment of the Texas National Guard — which consists of 14,000 members. Abbott and other statewide officials will receive another briefing on Harvey Friday afternoon, per a statement released by the governor's office Thursday afternoon. 

Here’s what you need to know:

A morning explosion

Thursday morning started with an explosion at a flooded-out chemical plant in Crosby. Arkema Inc. said the Harris County Emergency Operations Center notified the company at 2 a.m. of two explosions and black smoke coming from its Crosby plant, which was inundated by floodwater.

Following the explosion, a Harris County Office of Homeland Security and Emergency Management spokesman tweeted that there was a mandatory evacuation in place for those living 1.5 miles around the facility.

On Thursday morning, the Harris County sheriff described the incident as a chemical reaction, not an explosion. The Harris County Fire Marshal's office and the Harris County Sheriff’s Department downplayed environmental and public health risks from the plant.

The fires might not fizzle out soon, however. Officials say they expect more fires as a result of the flooded chemical plant. Richard Rennard, an Arkema spokesman, added that people who were exposed to smoke or fumes from the plant should seek medical attention, according to reports from USA Today. Ten to 15 people have already gone to the hospital as a precaution, though many were released.

Areas east of Houston are currently getting hit the hardest

• On Wednesday evening, Jasper County Judge Mark Allen issued a mandatory evacuation for residents living along the Neches River, which is expected to crest more than six feet above its previous record. According to the Beaumont Enterprise, the local reservoir is expected to release 44,100 cubic feet of water per second. This could lead to extreme floods, which could be life-threatening when coupled with the heavy rainfall Harvey has already brought to the region.

• The city of Beaumont  — which is home to roughly 120,000 people — has lost its water supply, according to a news release issued by the city Thursday morning. Officials say they have to wait until the floodwaters recede before assessing the extent of the damage to their water pump; they have no idea how long that will take.

• On Wednesday evening, the Corps of Engineers issued a warning to Jefferson County — home to about 660,000 residents — regarding massive flooding. According to officials, water from the Neches River was spilling into Steinhagen Lake faster than they could release it.

• Tyler County gave its constituents north of Beaumont a strong message: Evacuate immediately or die. In a Facebook post late Wednesday, the Tyler County Emergency Management department wrote that the floodgates were opened to 100 feet and that river levels would continue to rise. The post warned that residents living in Mt. Neches, Barlow Lake Estates, Works Bluff and Sheffield Ferry must evacuate “immediately” and that those who didn't “cannot expect to be rescued and should write their social security numbers in permanent marker on their arm so their bodies can be identified.”

• Overnight, Fort Bend County Emergency Management changed a voluntary evacuation to a mandatory order for several subdivisions in the Barker reservoir area in Houston, according to KHOU.