---
schema_version: "secwatch.filing_event.v1"
accession: "0001350593-23-000046"
form_type: "8-K"
ticker: "MWA"
cik: "0001350593"
company_name: "Mueller Water Products, Inc."
filed_at: "2023-10-30T23:59:59+00:00"
generated_at: "2026-06-09T05:42:16.247069+00:00"
event_type: "cyber"
sentiment: "negative"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Mueller Water Products reports cybersecurity incident; operational delays seen

## Summary
- Cybersecurity incident identified affecting certain operational and information technology systems; investigation in early stages.
- Company activated incident response and containment protocols; working with third-party cybersecurity specialists.
- Incident has caused and is expected to continue causing delays in business operations; may adversely impact financial results.
- Mueller notified law enforcement and is communicating with customers regarding the incident.

## SEC filing metadata
- accession: 0001350593-23-000046
- form_type: 8-K
- ticker: MWA
- cik: 0001350593
- company_name: Mueller Water Products, Inc.
- filed_at: 2023-10-30T23:59:59+00:00
- event_type: cyber
- sentiment: negative
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1350593/000135059323000046/0001350593-23-000046-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1350593/000135059323000046/mwa-20231028.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001350593-23-000046
- JSON: https://secwatch.observer/filing/0001350593-23-000046.json
- Plain text: https://secwatch.observer/filing/0001350593-23-000046.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.