MO5010575 · Missouri
NIANGUA PWS
Federal fiscal 2026Q3 · EPA violation and follow-up records
- Violation records shown
- 12
- EPA health-based flag
- 1
- Health-based records unresolved in this snapshot
- 0
- Monitoring and reporting records
- 9
Counties listed by EPA · Webster County, Missouri
Find the utility’s annual water quality report. For current advisories, check the utility or local drinking-water authority.
Violations and what followed
Among 12 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, Source Water (GWR)Violation 5209825 · E. COLI · Ground Water RuleNoncompliance period start May 1, 2025 · period end May 14, 2025 · first reported September 25, 2025 · EPA return-to-compliance field May 14, 2025
5 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 470960 May 14, 2025 Resolving State Compliance achieved 470952 May 29, 2025 Informal State Violation/Reminder Notice 470953 May 29, 2025 Informal State Public Notification requested 470959 July 3, 2025 Informal State Public Notification received 470961 October 7, 2025 Informal State Bilateral Compliance Agreement signed Monitoring or reporting · Resolved
Monitoring, Routine (RTCR)Violation 5209824 · Revised Total Coliform Rule · Revised Total Coliform RuleNoncompliance period start March 1, 2025 · period end March 31, 2025 · first reported June 23, 2025 · EPA return-to-compliance field March 31, 2025
5 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 470950 April 24, 2025 Informal State Violation/Reminder Notice 470951 April 24, 2025 Informal State Public Notification requested 470954 April 28, 2025 Resolving State Compliance achieved 470958 July 3, 2025 Informal State Public Notification received 470961 October 7, 2025 Informal State Bilateral Compliance Agreement signed Other or unclassified · Resolved
Public Notification Violation for NPDWR ViolationViolation 5209822 · Public Notice · Public Notice Rule and Revised PN RuleNoncompliance period start October 7, 2024 · period end June 13, 2025 · first reported March 28, 2025 · EPA return-to-compliance field June 13, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 470956 June 13, 2025 Resolving State Compliance achieved 470961 October 7, 2025 Informal State Bilateral Compliance Agreement signed Monitoring or reporting · Resolved
Lead Consumer NoticeViolation 5209823 · Lead and Copper Rule · Lead and Copper RuleNoncompliance period start October 1, 2024 · period end January 22, 2026 · first reported March 28, 2025 · EPA return-to-compliance field January 22, 2026
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 470961 October 7, 2025 Informal State Bilateral Compliance Agreement signed 470962 January 22, 2026 Resolving State Compliance achieved EPA health-based flag · Resolved
Treatment Technique, Level 1 Assessment (RTCR)Violation 5209821 · Revised Total Coliform Rule · Revised Total Coliform RuleNoncompliance period start August 12, 2024 · period end August 23, 2024 · first reported December 20, 2024 · EPA return-to-compliance field August 23, 2024
5 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 470949 August 23, 2024 Resolving State Compliance achieved 470947 August 27, 2024 Informal State Formal Notice of Violation issued 470948 August 27, 2024 Informal State Public Notification requested 470957 July 3, 2025 Informal State Public Notification received 470961 October 7, 2025 Informal State Bilateral Compliance Agreement signed Monitoring or reporting · Resolved
Monitoring, Routine (RTCR)Violation 5209820 · Revised Total Coliform Rule · Revised Total Coliform RuleNoncompliance period start May 1, 2024 · period end May 31, 2024 · first reported September 30, 2024 · EPA return-to-compliance field May 31, 2024
5 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 470944 July 2, 2024 Informal State Violation/Reminder Notice 470945 July 2, 2024 Informal State Public Notification requested 470946 July 10, 2024 Resolving State Compliance achieved 470955 July 3, 2025 Informal State Public Notification received 470961 October 7, 2025 Informal State Bilateral Compliance Agreement signed Monitoring or reporting · Resolved
Monitoring, Routine (RTCR)Violation 5209819 · Revised Total Coliform Rule · Revised Total Coliform RuleNoncompliance period start July 1, 2023 · period end July 31, 2023 · first reported November 14, 2023 · EPA return-to-compliance field July 31, 2023
6 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 470942 August 14, 2023 Resolving State Compliance achieved 470943 August 14, 2023 Resolving State Compliance achieved 470938 August 24, 2023 Informal State Violation/Reminder Notice 470939 August 24, 2023 Informal State Public Notification requested 470940 October 13, 2023 Informal State Public Notification received 470961 October 7, 2025 Informal State Bilateral Compliance Agreement signed Monitoring or reporting · Resolved
Monitoring, Routine (RTCR)Violation 5209817 · Revised Total Coliform Rule · Revised Total Coliform RuleNoncompliance period start September 1, 2022 · period end September 30, 2022 · first reported December 9, 2022 · EPA return-to-compliance field September 30, 2022
5 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 470936 October 19, 2022 Resolving State Compliance achieved 470934 October 31, 2022 Informal State Violation/Reminder Notice 470935 October 31, 2022 Informal State Public Notification requested 470941 October 13, 2023 Informal State Public Notification received 470961 October 7, 2025 Informal State Bilateral Compliance Agreement signed Other or unclassified · Resolved
Consumer Confidence Report Inadequate ReportingViolation 5209818 · Consumer Confidence Rule · Consumer Confidence RuleNoncompliance period start July 1, 2022 · period end November 29, 2022 · first reported December 9, 2022 · EPA return-to-compliance field November 29, 2022
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 470937 November 29, 2022 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, Routine (RTCR)Violation 5209816 · Revised Total Coliform Rule · Revised Total Coliform RuleNoncompliance period start July 1, 2021 · period end July 31, 2021 · first reported March 28, 2022 · EPA return-to-compliance field July 31, 2021
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 470932 August 24, 2021 Resolving State Compliance achieved 470929 September 7, 2021 Informal State Violation/Reminder Notice 470930 September 7, 2021 Informal State Public Notification requested 470931 October 13, 2021 Informal State Public Notification received Monitoring or reporting · Resolved
Monitoring, Routine (RTCR)Violation 5209815 · Revised Total Coliform Rule · Revised Total Coliform RuleNoncompliance period start September 1, 2019 · period end September 30, 2019 · first reported March 28, 2022 · EPA return-to-compliance field September 30, 2019
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 470925 October 29, 2019 Informal State Violation/Reminder Notice 470926 October 29, 2019 Informal State Public Notification requested 470927 December 18, 2019 Informal State Public Notification received 470928 January 15, 2020 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, Routine (RTCR)Violation 5209814 · Revised Total Coliform Rule · Revised Total Coliform RuleNoncompliance period start March 1, 2019 · period end March 31, 2019 · first reported March 28, 2022 · EPA return-to-compliance field March 31, 2019
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 470921 April 22, 2019 Informal State Violation/Reminder Notice 470922 April 22, 2019 Informal State Public Notification requested 470924 May 31, 2019 Informal State Public Notification received 470923 June 5, 2019 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