IA9778054 · Iowa

SIOUX CITY WATER SUPPLY

Federal fiscal 2026Q3 · EPA violation and follow-up records

Violation records shown: 2
EPA health-based flag: 0
Health-based records unresolved in this snapshot: 0
Monitoring and reporting records: 2

Counties listed by EPA · Woodbury County, Iowa

Find the utility’s annual water quality report. For current advisories, check the utility or local drinking-water authority.

Violations and what followed

Among 2 resolved records with both dates, the median interval from recorded noncompliance start to EPA’s return-to-compliance date was 30 days. The interval uses the reporting periods and dates on file.

Monitoring or reporting · Resolved

Monitoring and Reporting (DBP)Violation 208024 · TTHM · Stage 2 Disinfectants and Disinfection Byproducts Rule

Noncompliance period start May 1, 2024 · period end May 31, 2024 · first reported September 25, 2024 · EPA return-to-compliance field May 31, 2024

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
519349	July 17, 2024	Informal	State Public Notification requested
519350	July 17, 2024	Informal	State Formal Notice of Violation issued
519353	August 13, 2024	Resolving	State Compliance achieved
519355	May 12, 2025	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring and Reporting (DBP)Violation 207924 · Total Haloacetic Acids (HAA5) · Stage 2 Disinfectants and Disinfection Byproducts Rule

Noncompliance period start May 1, 2024 · period end May 31, 2024 · first reported September 25, 2024 · EPA return-to-compliance field May 31, 2024

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
519351	July 17, 2024	Informal	State Formal Notice of Violation issued
519352	July 17, 2024	Informal	State Public Notification requested
519354	August 13, 2024	Resolving	State Compliance achieved
519356	May 12, 2025	Informal	State Public Notification received

EPA data and scope

How to read the records

The enforcement snapshot is federal fiscal 2026Q3. The EPA archive labels its violation file October 13, 2026. EPA says federal reporting can lag by several months. For current advisories, check your utility or local drinking-water authority.

We matched active community water systems by public water system ID between EPA’s system search and SDWIS inventory. We show violations with a recorded noncompliance, initial reporting or return-to-compliance date from 2021 onward, plus earlier records listed as Addressed or Unaddressed.
EPA’s health-based flag identifies violations of contaminant or disinfectant limits or treatment requirements. Monitoring and reporting violations describe required tests or reports. Neither category measures household exposure.
Addressed means EPA records formal enforcement on a violation that remains unresolved in the snapshot. Unaddressed means no formal action is recorded for an unresolved violation. Resolved can mean compliance was restored, the rule ceased to apply, or further action was unnecessary. Archived is a separate status.
We count a violation once per water system and group its distinct linked actions. Conflicting records are set aside. Places are EPA-listed search locations and can include mailing locations. Use the provider name and system ID to identify your service.

EPA data dictionary and files · EPA reporting and enforcement FAQ · Find an annual water quality report · How to get the report from your utility