The bill banning US government use of Dahua and Hikvision products has been passed by both chambers of Congress (House vote [link no longer available], Senate vote). The US President has voiced support of this bill and is expected to be signed into law.
UPDATE: The Bill and Ban have now been signed into law.
How It Passed
In May, this ban was introduced as an amendment to the House version of the NDAA defense appropriations bill. However, at that time, the Senate did not include such a ban, raising hopes by Dahua and Hikvision that the ban would be removed in the reconciliation process. However, reconciliation included the ban and both the House and Senate easily passed the bill with the ban.
The reconciled bill is 1,360 pages covering a vast array of government regulations including the bans of Dahua and Hikvision for US government usage. The relevant section (p322 to 323) is:
One important possible expansion of the ban is a new clause calling out 'critical infrastructure' and 'national security purposes':
It is not clear if the bill bans use of Dahua and Hikvision in those areas but, if it did, it would significantly increase the impact as many non-governmental organizations could fall under those categories (utilities, banks, etc.)
Ban Starts 1 Year After Enacted
The bill says this 'prohibition' will start one year after it is enacted, which would put that in H2 2019:
However, in practice, the ban is immediate given the elimination clause.
Remove Existing Dahua and Hikvision Systems
Compounding the problem for Dahua and Hikvision, the bill includes a directive to 'phase-out' and 'eliminate' the use of existing equipment:
Overall, Dahua and Hikvision equipment is a distinct minority of US government video surveillance but there is a non-trivial amount deployed that could be a boon for system integrators and rival video surveillance manufacturers.