OK, this is the DHS's own report, linked above:
Management Alert - DHS Needs to Address Dangerous Overcrowding Among Single Adults at El Paso Del Norte Processing Center
www.oig.dhs.gov/sites/default/files/assets/Mga/2019/oig-19-46-may19-mgmtalert.pdf
PDT’s seven general cells and three small isolation cells are unable to accommodate the number of detainees currently being held at the processing facility within TEDS standards. Further limiting available space is the need to separate detainees with infectious diseases, such as chicken pox, scabies, and influenza, from each other and from the general population.
Border Patrol agents told us some of the detainees had been held in standing-room-only conditions for days or weeks. According to Border Patrol’s custody logs, there were 756 detainees on site when we visited PDT on May 7, 2019. Of those, 502 detainees (66 percent) had been held at PDT for longer than 72 hours, with 33 detainees (4 percent) held there for more than two weeks. On May 8, 2019, we returned to PDT for another unannounced spot inspection and observed that some family units and adult females had been transferred, but overall numbers were even higher as additional detainees had arrived for processing. According to Border Patrol staff, on May 8, 2019, the total number on site was approximately 900.