How US breach notification works
Every US state has its own breach notification law, and the law that applies is where the affected people live, not where your company is. A breach touching customers in ten states means ten sets of rules, and in practice the strictest deadline sets your timeline.
Deadlines in major states
| State | Notify residents | Notify the regulator |
|---|---|---|
| California | Within 30 calendar days | Sample notice to the Attorney General within 15 days if more than 500 residents |
| New York | Within 30 days of discovery | Attorney General, Department of State and State Police (and DFS for covered entities) |
| Texas | Within 60 days | Attorney General within 30 days if 250 or more Texans |
| Florida | Within 30 days (15 more for good cause) | Attorney General if 500 or more |
| Washington | Within 30 days | Attorney General if more than 500 |
| Colorado | Within 30 days of determining a breach | Attorney General if 500 or more |
| Illinois | Without unreasonable delay | Attorney General if more than 500 |
| Pennsylvania | Without unreasonable delay | Attorney General alongside resident notice if more than 500; 12 months of credit monitoring when certain identifiers are exposed |
| Massachusetts | As soon as practicable | Attorney General and the Office of Consumer Affairs and Business Regulation |
Industry rules can apply on top: HIPAA for health data (60 days), and FTC Safeguards Rule reporting for non-bank financial firms (to the FTC within 30 days of discovery when 500 or more consumers are affected). See the HIPAA penalty guide.
What notification costs
The estimator above adds a per-person figure for printing, postage and a call centre, and a credit monitoring figure when Social Security numbers or financial account data are involved. These are planning estimates; legal fees, forensics and regulator inquiries come on top.
Be ready before it happens
- Know which states your customers and employees live in.
- Keep notice templates and the regulators' contact routes ready.
- Make sure your monitoring can tell you what was accessed, because that decides who must be told.
- Rehearse it: a tabletop exercise exposes the gaps before a real incident does.
See incident response services.
Sources
- Cal. Civ. Code 1798.82; N.Y. Gen. Bus. Law 899-AA; Tex. Bus. & Com. Code 521.053
- Fla. Stat. 501.171; RCW 19.255.010; Colorado AG (C.R.S. 6-1-716)
- 815 ILCS 530/10; Pennsylvania AG; Mass. Gen. Laws ch. 93H s.3
Facts checked against the sources above on 22 October 2026. General information, not legal advice.
