IA0640030 · Iowa

KEYSTONE WATER SUPPLY

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

Violation records shown: 3
EPA health-based flag: 3
Health-based records unresolved in this snapshot: 0
Monitoring and reporting records: 0

Counties listed by EPA · Benton 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 3 resolved records with both dates, the median interval from recorded noncompliance start to EPA’s return-to-compliance date was 29 days. The interval uses the reporting periods and dates on file.

EPA health-based flag · Resolved

Treatment Technique (SWTR and GWR)Violation 139421 · Groundwater Rule · Ground Water Rule

Noncompliance period start May 1, 2021 · period end May 31, 2021 · first reported September 17, 2021 · EPA return-to-compliance field May 31, 2021

2 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
707000	July 6, 2021	Informal	State Formal Notice of Violation issued
707003	September 7, 2021	Resolving	State Compliance achieved

EPA health-based flag · Resolved

Maximum Contaminant Level Violation, Single SampleViolation 93821 · Nitrite · Nitrate Rule

Noncompliance period start April 1, 2021 · period end April 30, 2021 · first reported September 17, 2021 · EPA return-to-compliance field April 30, 2021

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
706997	April 14, 2021	Informal	State Formal Notice of Violation issued
706998	April 14, 2021	Informal	State Public Notification requested
706996	April 20, 2021	Informal	State Public Notification received
707002	October 12, 2021	Resolving	State Compliance achieved

EPA health-based flag · Resolved

Maximum Contaminant Level Violation, Single SampleViolation 44621 · Nitrite · Nitrate Rule

Noncompliance period start November 1, 2020 · period end November 30, 2020 · first reported March 11, 2021 · EPA return-to-compliance field November 30, 2020

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
706991	November 19, 2020	Informal	State Formal Notice of Violation issued
706992	November 19, 2020	Informal	State Public Notification requested
706994	December 28, 2020	Informal	State Public Notification received
707001	October 12, 2021	Resolving	State Compliance achieved

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