MO2010515 · Missouri
MERCER PWS
Federal fiscal 2026Q3 · EPA violation and follow-up records
- Violation records shown
- 16
- EPA health-based flag
- 11
- Health-based records unresolved in this snapshot
- 0
- Monitoring and reporting records
- 3
Counties listed by EPA · Mercer 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 16 resolved records with both dates, the median interval from recorded noncompliance start to EPA’s return-to-compliance date was 91 days. The interval uses the reporting periods and dates on file.
EPA health-based flag · Resolved
Maximum Contaminant Level Violation, AverageViolation 1214931 · TTHM · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance period start January 1, 2026 · period end March 31, 2026 · first reported June 16, 2026 · EPA return-to-compliance field March 31, 2026
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1871 May 18, 2026 Resolving State Compliance achieved 1868 May 29, 2026 Informal State Public Notification requested 1869 May 29, 2026 Informal State Formal Notice of Violation issued 1870 June 12, 2026 Informal State Public Notification received EPA health-based flag · Resolved
Maximum Contaminant Level Violation, AverageViolation 1214930 · TTHM · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance period start October 1, 2025 · period end December 31, 2025 · first reported March 25, 2026 · EPA return-to-compliance field December 31, 2025
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1865 March 9, 2026 Informal State Public Notification requested 1866 March 9, 2026 Informal State Formal Notice of Violation issued 1867 April 24, 2026 Informal State Public Notification received 1871 May 18, 2026 Resolving State Compliance achieved EPA health-based flag · Resolved
Maximum Contaminant Level Violation, AverageViolation 1214929 · TTHM · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance period start July 1, 2025 · period end September 30, 2025 · first reported December 31, 2025 · EPA return-to-compliance field September 30, 2025
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1862 December 11, 2025 Informal State Public Notification requested 1863 December 11, 2025 Informal State Formal Notice of Violation issued 1864 January 13, 2026 Informal State Public Notification received 1871 May 18, 2026 Resolving State Compliance achieved EPA health-based flag · Resolved
Maximum Contaminant Level Violation, AverageViolation 1214928 · TTHM · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance period start April 1, 2025 · period end June 30, 2025 · first reported September 25, 2025 · EPA return-to-compliance field June 30, 2025
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1859 August 14, 2025 Informal State Public Notification requested 1860 August 14, 2025 Informal State Formal Notice of Violation issued 1861 August 28, 2025 Informal State Public Notification received 1871 May 18, 2026 Resolving State Compliance achieved EPA health-based flag · Resolved
Maximum Contaminant Level Violation, AverageViolation 1214927 · TTHM · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance period start October 1, 2024 · period end December 31, 2024 · first reported March 28, 2025 · EPA return-to-compliance field December 31, 2024
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1857 February 26, 2025 Resolving State Compliance achieved 1854 March 11, 2025 Informal State Public Notification requested 1855 March 11, 2025 Informal State Formal Notice of Violation issued 1856 April 18, 2025 Informal State Public Notification received EPA health-based flag · Resolved
Maximum Contaminant Level Violation, AverageViolation 1214926 · TTHM · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance period start July 1, 2024 · period end September 30, 2024 · first reported December 20, 2024 · EPA return-to-compliance field September 30, 2024
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1851 December 20, 2024 Informal State Public Notification requested 1852 December 20, 2024 Informal State Formal Notice of Violation issued 1853 January 22, 2025 Informal State Public Notification received 1857 February 26, 2025 Resolving State Compliance achieved EPA health-based flag · Resolved
Maximum Contaminant Level Violation, AverageViolation 1214925 · TTHM · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 30, 2024 · EPA return-to-compliance field June 30, 2024
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1848 September 5, 2024 Informal State Public Notification requested 1849 September 5, 2024 Informal State Formal Notice of Violation issued 1850 October 17, 2024 Informal State Public Notification received 1857 February 26, 2025 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring and Reporting (DBP)Violation 1214924 · Total Haloacetic Acids (HAA5) · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance period start July 1, 2023 · period end September 30, 2023 · first reported December 26, 2023 · EPA return-to-compliance field September 30, 2023
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1846 June 30, 2023 Informal State Public Notification received 1843 December 19, 2023 Informal State Violation/Reminder Notice 1844 December 19, 2023 Informal State Public Notification requested 1847 May 17, 2024 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring and Reporting (DBP)Violation 1214923 · TTHM · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance period start July 1, 2023 · period end September 30, 2023 · first reported December 26, 2023 · EPA return-to-compliance field September 30, 2023
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1846 June 30, 2023 Informal State Public Notification received 1843 December 19, 2023 Informal State Violation/Reminder Notice 1844 December 19, 2023 Informal State Public Notification requested 1847 May 17, 2024 Resolving State Compliance achieved Other or unclassified · Resolved
Public Notification Violation for NPDWR ViolationViolation 1214921 · Public Notice · Public Notice Rule and Revised PN RuleNoncompliance period start April 8, 2021 · period end April 28, 2021 · first reported March 28, 2022 · EPA return-to-compliance field April 28, 2021
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1837 April 28, 2021 Resolving State Compliance achieved Other or unclassified · Resolved
Public Notification Violation for NPDWR ViolationViolation 1214920 · Public Notice · Public Notice Rule and Revised PN RuleNoncompliance period start February 1, 2021 · period end February 10, 2021 · first reported March 28, 2022 · EPA return-to-compliance field February 10, 2021
1 linked action
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1839 February 10, 2021 Resolving State Compliance achieved EPA health-based flag · Resolved
Maximum Contaminant Level Violation, AverageViolation 1214919 · TTHM · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance period start October 1, 2020 · period end December 31, 2020 · first reported March 28, 2022 · EPA return-to-compliance field December 31, 2020
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1836 January 1, 2021 Resolving State Compliance achieved 1834 February 26, 2021 Informal State Public Notification requested 1835 February 26, 2021 Informal State Formal Notice of Violation issued 1838 November 9, 2021 Informal State Public Notification received Monitoring or reporting · Resolved
Monitoring, Routine (RTCR)Violation 1214917 · Revised Total Coliform Rule · Revised Total Coliform RuleNoncompliance period start October 1, 2020 · period end October 31, 2020 · first reported March 28, 2022 · EPA return-to-compliance field October 31, 2020
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1833 November 4, 2020 Resolving State Compliance achieved 1828 December 3, 2020 Informal State Violation/Reminder Notice 1829 December 3, 2020 Informal State Public Notification requested 1830 December 28, 2020 Informal State Public Notification received EPA health-based flag · Resolved
Maximum Contaminant Level Violation, AverageViolation 1214918 · TTHM · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance period start July 1, 2020 · period end September 30, 2020 · first reported March 28, 2022 · EPA return-to-compliance field September 30, 2020
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1831 December 22, 2020 Informal State Public Notification requested 1832 December 22, 2020 Informal State Formal Notice of Violation issued 1836 January 1, 2021 Resolving State Compliance achieved 1840 November 9, 2021 Informal State Public Notification received EPA health-based flag · Resolved
Maximum Contaminant Level Violation, AverageViolation 1214916 · TTHM · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance period start April 1, 2020 · period end June 30, 2020 · first reported March 28, 2022 · EPA return-to-compliance field June 30, 2020
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 1825 September 18, 2020 Informal State Public Notification requested 1826 September 18, 2020 Informal State Formal Notice of Violation issued 1827 October 23, 2020 Informal State Public Notification received 1836 January 1, 2021 Resolving State Compliance achieved EPA health-based flag · Resolved
Maximum Contaminant Level Violation, AverageViolation 1214915 · TTHM · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance period start July 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 1821 December 6, 2019 Informal State Public Notification requested 1822 December 6, 2019 Informal State Formal Notice of Violation issued 1823 January 31, 2020 Informal State Public Notification received 1824 July 1, 2020 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