Montana
From US data breach notification laws: After a data breach, how fast must a business tell people, and who else must it tell?
Law: 30-14-1704
The section that holds the state's general breach notification duty for businesses, as the source names it.
30-14-1704
Source: https://mca.legmt.gov/bills/mca/title_0300/chapter_0140/part_0170/section_0040/0300-0140-0170-0040.html. Read 2026-11-01. Checked by a second reader.
Days to tell residents: Not stated
The outer limit in days for telling affected residents, as stated. Blank where no number is stated. States start the clock differently, at discovery or at determining a breach happened, and the quote shows which.
No source we could use stated this. A blank never means no.
How fast, in the law's words: without unreasonable delay
The law's own words for how quickly residents must be told, apart from any day count.
the disclosure must be made without unreasonable delay
Source: https://mca.legmt.gov/bills/mca/title_0300/chapter_0140/part_0170/section_0040/0300-0140-0170-0040.html. Read 2026-11-01. Checked by a second reader.
Attorney general told: Yes
Yes if the source says the state attorney general or its equivalent must be told of a breach in at least some cases. Florida's Department of Legal Affairs and Oregon's Attorney General count.
to the attorney general's consumer protection office
Source: https://mca.legmt.gov/bills/mca/title_0300/chapter_0140/part_0170/section_0040/0300-0140-0170-0040.html. Read 2026-11-01. Checked by a second reader.
Residents before the AG is told: Not stated
The number of affected residents at which the attorney general must be told, as stated. Blank where no number is stated. The quote shows whether it means that many or more than that many.
No source we could use stated this. A blank never means no.
Days to tell the AG: Not stated
The deadline in days for telling the attorney general, as stated. Blank where no number is stated. Clocks differ: some run from the breach, and others from telling residents, as the quote shows.
No source we could use stated this. A blank never means no.
Encrypted data excepted: Yes
Yes if the text limits the duty to unencrypted data, or leaves encrypted data out. Stolen keys can undo this in several states.
whose unencrypted personal information
Source: https://mca.legmt.gov/bills/mca/title_0300/chapter_0140/part_0170/section_0040/0300-0140-0170-0040.html. Read 2026-11-01. Checked by a second reader.
Low-harm exception: Yes
Yes if the text lets a business skip notice after finding that harm or misuse is unlikely, or only counts breaches that create a real risk.
causes or is reasonably believed to cause loss or injury to a montana
Source: https://mca.legmt.gov/bills/mca/title_0300/chapter_0140/part_0170/section_0040/0300-0140-0170-0040.html. Read 2026-11-01. Checked by a second reader.