ORLANDO, Fla. – Orange County is urging the federal government to fully reimburse the costs incurred for accommodating ICE immigration detainees at the county jail.

Recently, it came to light through a report by News 6 that the federal government owes the county approximately $644,000, as stated by officials from Orange County.

In correspondence to the U.S. Marshals Service, which News 6 obtained, Mayor Jerry Demings expressed his concern about the financial burden imposed on Orange County taxpayers due to federal legislative mandates.

Mayor Demings highlighted that the county jail has experienced a surge in ICE detainees, with more than 5,000 inmates processed over the last eight months.

[WATCH: Orange County outlines expenses related to housing ICE inmates amid enforcement measures]

The compact that the county signed with the feds earlier this year shows the county is supposed to receive $88 per inmate held in the jail per day.

The county says it costs $180 a day to house an inmate in the jail. The difference between the two figures means county taxpayers are on the hook for $92 a day per inmate.

The federal government has not made any payments since July.

Demings’ letter says the county formally requested to renegotiate the Intergovernmental Services Agreement in August because of the increasing costs.

[WATCH: Orange County mayor pours cold water on plea from immigration advocates]

“This calculation is based upon the expense of providing a secure environment, as well as providing appropriate health care and access to the basic human needs experienced by an inmate in our facility,” Demings wrote.

Since sending that request in August, Demings says the county has housed an additional 3,626 ICE inmates. Demings says that, at the $92/day rate, those inmates alone cost the county $333,592.

“The burden of the expense related to immigration enforcement activities should be borne by the federal government, not local governments who’ve been forced to follow the law in support of your initiatives,” Demings wrote.

Demings signed the agreement with the federal government earlier this year after the passage of a state law compelling compliance, and pressure from Gov. Ron DeSantis and Attorney General James Uthmeier, who threatened to remove local government officials who did not sign the agreement.

However, the decision was met with outrage among immigration advocates and more liberal members of the county commission, who have since tried to convince Demings to rescind the agreement.

READ Demings’ full letter below.