Plateau Excavation Inc., described in public reports as a site infrastructure and heavy civil contractor, has sent breach notification letters and reported a data security incident to Massachusetts regulators. Public reports say Social Security numbers and driver’s license numbers were involved.
This page summarizes the limited public information available so far.
Plateau Excavation Inc.’s Data Breach Investigation
Plateau Excavation, Inc. is a contractor that works on site infrastructure and heavy civil construction projects, according to the ClaimDepot data breach database. Companies in the construction industry hold personal information about employees, subcontractors, job applicants and sometimes customers, including tax and identification details needed for payroll and hiring.
The main public record of this incident is a sample notification letter that Plateau Excavation filed with the state of Massachusetts. The letter is dated October 30, 2026. ClaimDepot reports that the incident was reported to the Massachusetts Office of Consumer Affairs and Business Regulation on October 30, 2026 and that the company began notifying affected people the same day.
The letter itself says very little about what happened. It states that Massachusetts law limits the information the company can share in the letter about the incident. Massachusetts requires breach notices sent to residents not to describe the nature of the breach, so letters filed there are often short on detail by design. As a result, the letter does not say how the incident happened, when it took place, when the company found out, or how many people were affected. This page does not guess at any of those points.
The company says it has finished its review of the incident and is giving affected people two years of complimentary credit monitoring. The offer is through Experian IdentityWorks, with a membership of 24 months. The letter says people must enroll by February 26, 2027. It also describes identity restoration help from an Experian agent, available for 24 months from the date of the letter, to help people who believe their information was used fraudulently. The letter lists a toll-free assistance line, 833-918-4033, and also includes guidance on placing a fraud alert or security freeze on a credit file and on reporting a fraudulent tax return to the IRS and state tax authorities.
The types of information involved are not listed in the letter’s text. ClaimDepot, which summarizes the Massachusetts filing, reports that Social Security numbers and driver’s license numbers were exposed. Its database lists several other categories of information as not yet disclosed, so the full picture of what each person’s notice describes may differ.
The mention of tax-return fraud in the letter is worth noting. Social Security numbers are the key detail criminals use to file false tax returns and claim refunds in someone else’s name, and the letter’s guidance on that topic reflects the type of information reported. A driver’s license number can be used to build a convincing fake identity, to open accounts or to pass identity checks. Together, the two items give a criminal much of what is needed to impersonate someone.
Because the company has not said how the incident occurred, the possible risks are best understood in general terms. Stolen data can be used or sold months after an incident, and scam messages that cite real details can look believable. People who receive a notice should read it closely, enroll in the monitoring services if they want them, and keep a copy of the letter.
If Plateau Excavation publishes a fuller notice or reports the incident to other state attorneys general with more detail, those filings will be the best source for the cause, the timeline and the number of people affected.
When Did This Breach Occur?
The notification letter is dated October 30, 2026, and ClaimDepot reports the Massachusetts report was made on October 30, 2026.
The letter does not give the date the incident happened or the date the company found out, and no other public source gives those dates, so they are not stated here.
What Information Was Breached?
The letter’s text does not list the information involved. ClaimDepot, summarizing the Massachusetts filing, reports Social Security numbers and driver’s license numbers.
Your own notice may describe the information involved in more detail, and not everyone affected necessarily had every item exposed.
What You Can Do
If you received a notice from Plateau Excavation or believe you may be affected, consider these steps:
- Read the notice carefully and keep it, along with the activation details for the Experian IdentityWorks membership, which must be used by February 26, 2027.
- Place a free fraud alert or credit freeze with Equifax, Experian and TransUnion, and get your credit reports free at annualcreditreport.com.
- Watch for a tax return filed in your name, and report a fraudulent return to the IRS and your state tax authority.
- Be skeptical of unexpected calls, texts or emails that mention the incident, and report suspected identity theft to the Federal Trade Commission at identitytheft.gov.
File a Data Breach Lawsuit Against Plateau Excavation Inc.
If you received a notice from Plateau Excavation Inc., you may have legal options. A data breach lawsuit can seek compensation for the loss of privacy, the time spent protecting yourself and any out-of-pocket costs, and can press a company to improve how it safeguards personal information. Whether a claim makes sense depends on the facts of the incident, many of which have not been made public. Keep your notice letter and any records of suspicious activity or expenses, since they may matter later.
Contact us at Class Action U, where we’ll connect you with a lawyer skilled in class action lawsuits. If you’ve been contacted about this breach, received notice, or discovered you were impacted, fill out our quick, easy, and secure form to sign up. There is no cost to reach out to our legal partner and no obligation after speaking with someone from our team.
