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MonitoringIndiana AG filing · August 6, 2026

Sonoma Underground Services Inc Data Breach Confirmed in Indiana

Sonoma Underground Services Inc, an Indiana-based contractor, filed notice of a data breach with state authorities on August 6, 2026. The incident, which occurred in December 2025, exposed sensitive personal and financial data. Individuals affected by the breach should be aware of potential risks to their identity and finances.

State
Indiana
Breach date
December 10, 2025
Reported
August 6, 2026

What may have been exposed

  • Full Name
  • Social Security Number
  • Date of Birth
  • Wage and Compensation Information
  • Direct Deposit Account Details
  • Home Address
  • Driver's License Number
  • Tax Withholding Information

Sonoma Underground Services Inc, an Indiana-based utility and infrastructure contractor, has reported a data security incident to state regulators. The company filed notice of the breach on August 6, 2026, indicating that the incident itself took place on or about December 10, 2025. The filing described the breach type as unspecified, and an investigation into the matter is ongoing.

The compromised data categories include a wide range of sensitive personal information. Specifically, the breach exposed Full Name, Social Security Number, Date of Birth, Wage and Compensation Information, Direct Deposit Account Details, Home Address, Driver's License Number, and Tax Withholding Information.

Exposure of such comprehensive personal data creates significant risks for affected individuals. This information could be used for various forms of identity theft, financial fraud, and unauthorized access to other personal accounts. The presence of financial details like direct deposit information and tax withholding data adds a layer of concern for potential monetary misuse.

Individuals who receive a notification from Sonoma Underground Services Inc are advised to take protective measures immediately. It is recommended to carefully review all financial statements and credit reports for any unauthorized activity. Affected parties may also consider placing a fraud alert or security freeze on their credit files with major credit bureaus.

Staying vigilant against phishing attempts and unsolicited communications is crucial, as threat actors often use exposed data to craft convincing scams. Regularly updating passwords for online accounts and enabling multi-factor authentication where available can also help enhance personal security in the wake of such an incident. These steps are general precautions that can help mitigate the potential impact of exposed personal data.

What to do if you were affected

Based on the categories of information reported in this filing, these steps can help limit the risk of identity theft and fraud.

  • Freeze your credit

    Place a free credit freeze with Equifax, Experian, and TransUnion. A freeze blocks new accounts from being opened in your name and can be lifted anytime.

  • Guard against tax fraud

    File your tax return as early as possible and consider requesting an IRS Identity Protection PIN so no one can file a fraudulent return in your name.

  • Watch your financial accounts

    Review bank and card statements for unfamiliar activity and turn on transaction alerts. Report anything you don't recognize to your bank right away.

  • Replace exposed ID documents

    Contact your state DMV or the issuing agency about replacing an exposed driver's license, passport, or government ID number.

  • Stay alert to targeted scams

    Be cautious of calls, texts, or emails that reference this breach. Legitimate organizations won't ask you to confirm sensitive details through an unsolicited message.

  • Keep your notification letter

    Save the notice you received. It documents that your information was involved and is often needed to enroll in any credit monitoring offered or to join a related legal claim.

Sonoma Underground Services Inc breach filing: questions and answers

Where can I see the official Sonoma Underground Services Inc breach notice?
Sonoma Underground Services Inc's report is published by the Indiana Attorney General: https://www.in.gov/attorneygeneral/consumer-protection-division/id-theft-prevention/security-breaches/#3sonoma-underground-services-inc-2026 Compare it with the letter you received to confirm the dates and details match.
How many people were affected by the Sonoma Underground Services Inc data breach, and what was exposed?
The filing does not give a count of affected people and lists the following information as involved: Full Name, Social Security Number, Date of Birth, Wage and Compensation Information, Direct Deposit Account Details, Home Address, Driver's License Number, Tax Withholding Information. Your own letter is the best guide to what was exposed about you, since notices are usually tailored to each person.
Is there a Sonoma Underground Services Inc data breach class action lawsuit?
Law firms often open an investigation after a breach notice like this one, and a class action lawsuit may follow. This page doesn't confirm that a lawsuit has been filed against Sonoma Underground Services Inc. You usually don't have to join a class action to be included — if a settlement is reached, class members are notified and can file a claim.
Is the Sonoma Underground Services Inc data breach letter legit or a scam?
A notice from Sonoma Underground Services Inc in the mail matches the breach Sonoma Underground Services Inc reported to the Indiana Attorney General on August 6, 2026. Check that the company name and dates in your letter match that filing. A real notice of data security incident won't ask for your password, Social Security number or a payment — if it does, contact Sonoma Underground Services Inc through a phone number or website you find yourself.
Can I sue Sonoma Underground Services Inc over the data breach?
It depends on what was exposed, the law in Indiana and your own state, and whether you've been harmed. Most people take part through a class action rather than suing alone. Keep your notification letter — it's the proof that connects you to the breach.
How much could a Sonoma Underground Services Inc data breach settlement or claim be worth?
There is no set amount, and no Sonoma Underground Services Inc settlement is confirmed here. In past data breach settlements, payments depended on what data was exposed and on documented losses — fraud, out-of-pocket costs and time spent dealing with the breach. The filing lists Full Name, Social Security Number, Date of Birth as involved. Keep receipts and records; they're what damages claims are built on.
Did Sonoma Underground Services Inc offer free credit monitoring?
Any free monitoring Sonoma Underground Services Inc is offering will be described in the notice you received, along with an activation code and a sign-up deadline. Because Social Security numbers are listed in this filing, identity monitoring and a credit freeze matter more than usual. Signing up doesn't waive any legal rights you may have.
Do I need a Sonoma Underground Services Inc data breach lawyer or attorney?
An attorney can read your notice and tell you whether a claim makes sense. A case review here is free, and data breach cases are usually handled on contingency, so there is no upfront cost.
What should I do after getting the Sonoma Underground Services Inc data breach notice?
Keep the letter and the envelope, and note the date it arrived. Freeze your credit with Equifax, Experian and TransUnion, change any passwords the notice mentions, and sign up for any free credit monitoring the letter offers. Then check whether you may have a claim.

Source: Indiana Attorney General filing

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