WHEN do you have to notify by? State laws vary.

MintzLevin has updated its state data breach law matrix, as I noted previously on the page where I link to such resources.

Here’s an excerpt from their matrix:

Breach Notification Timeline

Time After Discovery of Breach	Action Required
10 Calendar Days	Puerto Rico Department of Consumer Affairs
14 Business Days	Vermont AG preliminary notification
15 Business Days	California residents, California AG, and California Department of Public Health must be notified of the disclosure of PHI by a clinic, health facility, home health agency, or hospice licensed by the California Department of Public Health (“CDPH”)
30 Calendar Days	Florida residents, AG (500+ residents) (Can request 15 day extension) (60 Days for PHI/HIPAA incidents). Indiana AG will open an investigation if not notified within 30 days
45 Calendar Days	Ohio residents Tennessee residents (60 Days for PHI/HIPAA incidents) Vermont residents, AG Washington residents, AG (500+ residents) (60 Days for PHI/HIPAA incidents) Wisconsin residents (60 Days for PHI/HIPAA incidents New Mexico residents, AG (500+ residents) Maryland residents (60 Days for PHI/HIPAA incidents)
60 Calendar Days	Individuals and HHS OCR for PHI disclosure. Delaware (effective 4/14/18), AG (500+ residents)
90 Calendar Days	Connecticut residents (60 days for PHI/HIPAA incidents)
Most expedient time and without unreasonable delay	AK, AZ, AR, CA (other than as noted above), CO, DE (until 4/14/18), DC, GA, HI, ID, IL, IA, KS, KY, ME, MA, MI, MN, MS, MO, MT, NV, NJ, NY, NC, ND, OK, OR, PA, PR, SC, UT, VA, WV, WY
As soon as possible	NE, NH, TX
Days After Confirmation of Breach	Action Required
45 Calendar Days	Rhode Island residents, AG (500+ residents) (60 Days for PHI/HIPAA incidents).