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Give the auditor a control-mapped evidence package—not a certificate claiming that S3 is “compliant.” Start with the auditor’s control list, system scope, evidence format, and lookback period. Then provide relevant AWS assurance reports alongside dated evidence of your own S3 configuration, access, activity, monitoring, and operating procedures.
First, establish what the audit covers
Ask the auditor to specify the controls or requirements being tested, the accounts and Regions in scope, the relevant buckets and data flows, the evidence format, and the period under review. The request list and your system boundary determine what to collect; there is no universal S3 evidence bundle that proves every HIPAA safeguard.
Identify where electronic protected health information (ePHI) is stored or accessed, which team owns each resource, and how data moves into and out of S3. For each artifact, record its control identifier, bucket or other resource, account and Region, evidence owner, collection date, period covered, result or exception, and a pointer to the underlying file. Keep the original artifact with a short explanation of what it demonstrates and what it does not.
Before using AWS HIPAA-eligible services with PHI, a covered entity or business associate must have an AWS Business Associate Addendum (BAA) in place. Confirm current service eligibility and the terms applicable to your use; eligibility does not establish that your particular workload is configured or operated appropriately.
#1 Best Overall
Build the evidence package around the auditor’s controls
| Evidence area | Artifacts to prepare | What they help demonstrate |
|---|---|---|
| Scope and ownership | Account and Region list, bucket inventory, data-owner list, ePHI boundary, and data-flow description | Which resources and flows are in scope and who is responsible for them. AWS’s Amazon S3 security best practices recommend identifying and auditing S3 buckets. |
| AWS assurance | Relevant third-party reports downloaded from AWS Artifact, with the report period and applicable AWS service-scope reference | AWS-level audited controls within the report’s stated scope and period. AWS makes third-party reports available through Artifact; those reports do not establish your organization’s configuration or operations. |
| Stored-data protection | Bucket encryption configuration, relevant key configuration and ownership, and an S3 Inventory report with requested encryption or replication fields | How encryption is configured and whether the inventory represents objects as expected. AWS says S3 Inventory can report object encryption and replication status. S3 encrypts new objects at rest by default with SSE-S3 unless another option is configured; show the actual setting and evidence for the objects and period under review. |
| Access restrictions | Bucket and access-point policies, Block Public Access state, relevant IAM role and policy excerpts, and applicable AWS Config findings | How access is restricted and whether the observed configuration matches the organization’s intended settings. Prefer machine-readable exports or rule results where available rather than relying on screenshots alone. |
| Activity capture | CloudTrail trail configuration and relevant event samples for the requested period; S3 server access logging configuration and samples if used | Evidence of recorded actions and requests. CloudTrail records can show who performed an operation, what was requested, when it occurred, and the source IP address. Confirm that object-level data events are configured for the in-scope buckets and period. |
| Configuration and change oversight | AWS Config recorder scope, rule definitions and evaluations, configuration history or snapshots, and remediation or change records | Whether monitored resources meet the organization’s desired settings and how changes are reviewed. AWS Config managed rules support general purpose buckets; AWS documentation says Config does not record configuration changes for directory buckets, so validate coverage if those buckets are in scope. |
| Retention and integrity | Log retention settings, access restrictions on log destinations, and Object Lock configuration if used | How retained evidence is protected from premature deletion or alteration. AWS notes that Object Lock can help protect CloudTrail logs; provide evidence of the configuration actually in use. |
| Manual and exception evidence | Risk acceptances, tickets, periodic review records, procedures, training records, incident records, and control-owner sign-off when requested | Human-operated safeguards and exceptions that an automated configuration snapshot cannot establish. |
Treat the table as a preparation checklist, not a prebuilt HIPAA control mapping. A screenshot, one passing Config rule, or an AWS assurance report alone does not prove that all applicable safeguards are satisfied.
Choose logs that answer the auditor’s activity question
CloudTrail and S3 server access logging serve related but different evidence needs. AWS recommends CloudTrail for S3 bucket-level and object-level actions; server access logs provide a different record and may contain fields CloudTrail does not. Select and explain the source based on the event requested, coverage, retention, delivery, and how the records will be searched.
| Evidence source | Useful for | What to verify |
|---|---|---|
| CloudTrail | Bucket-level activity and, when configured, object API activity | Trail configuration, selectors covering the in-scope buckets and requested period, relevant event samples, retention, and log integrity validation where applicable. Object-level coverage requires the appropriate data-event configuration. |
| S3 server access logs | A separate record of requests to a bucket, including fields that may not appear in CloudTrail records | Logging configuration, destination access, delivery and retention, and samples that cover the auditor’s requested interval. Explain any coverage or delivery limitations relevant to the evidence. |
Use AWS services as evidence sources, not as the audit conclusion
AWS Artifact: AWS-level assurance
Download reports relevant to the service and audit period, and preserve each report’s scope and reporting dates. Use them to support claims about AWS’s audited controls, not as a substitute for evidence about your account, buckets, or operating practices.
AWS Config and S3 Inventory: configuration evidence
Enable AWS Config recording for the S3 resource types in scope, then retain the applicable rule evaluations and configuration history. Use S3 Inventory reports for requested object-level fields such as encryption or replication status, and label each export with its date and resource scope. Check that the resource types and fields actually cover the buckets being audited.
Rank #3
AWS Audit Manager: collection and organization
An AWS Audit Manager HIPAA framework can help organize evidence. Review the source mapping behind each framework item, enable relevant data sources, investigate inconclusive items, and add manual records where a control depends on human activity. Audit Manager can collect items such as Config and Security Hub checks, CloudTrail user activity, API configuration snapshots, and uploaded evidence, but AWS says it does not assess compliance and may not gather everything an audit requires. AWS also states, “AWS Audit Manager isn’t a substitute for legal counsel or compliance experts.”
Assemble and validate the export
- Turn the request list into an index. Give each requested control or test a row with its scope, owner, source, collection date, period, result, exceptions, and artifact location.
- Collect dated, scoped evidence. Export the relevant configurations, inventory reports, rule evaluations, and log records. Capture the account, Region, resource, and coverage period in the index or artifact metadata so the auditor can interpret each file.
- Explain exceptions and gaps. Attach the relevant ticket, risk acceptance, remediation record, or control-owner explanation. If a source does not cover a resource or requested date range, state that plainly rather than presenting a partial export as complete.
- Check the package against the request. Confirm that every requested control has evidence or a clearly documented exception, that logs cover the requested lookback period, and that each explanation matches the artifact it describes. Retain originals as well as any summarized evidence.
Keep current HIPAA requirements separate from proposed changes
AWS guidance dated July 31, 2026 describes the HIPAA Security Rule Technical Safeguards at 45 CFR §164.312 as covering access control, audit controls, integrity, authentication, and transmission security. The same guidance discusses the January 2025 HHS Notice of Proposed Rulemaking, including proposed encryption and multifactor-authentication requirements, and reports that the proposal had not become final as of June 2026. A proposal is not itself a binding final rule. Because that status can change, verify current HHS rulemaking and the requirements applicable to the audit period before treating any proposed control as effective law.
Rank #4
AWS describes its own compliance responsibility for S3 as dependent on data sensitivity, organizational objectives, and applicable laws and regulations. That shared-responsibility distinction is why an AWS report and customer-side evidence belong together in the audit package.
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