Concordia PWS
Community water system in Concordia, Lafayette County, Missouri, serving 2,500 people from surface water. 6 rules violated in the past three years. Owned by local government.
Quarterly compliance history
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
2026
Rules violated in the past three years
Jul to Sep 2023 to Jul to Sep 2026
Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Monitoring and Reporting
2 violations, Mar 2024 to Mar 2024 · Interim Enhanced Surface Water Treatment Rule
Interim and Long Term 1 Enhanced Surface Water Treatment Rule
Monitoring and Reporting2 violations, Mar 2024 to Mar 2024 · Interim Enhanced Surface Water Treatment Rule
Monitoring and Reporting: 2 violations, Mar 2024 to Mar 2024. The system did not complete required monitoring, or did not report the results on time. This does not show that a contaminant was found.
Contaminant on the record: Interim Enhanced Surface Water Treatment Rule.
Surface Water Treatment Rule
Monitoring and Reporting
1 violation, Mar 2024 to Mar 2024
Surface Water Treatment Rule
Monitoring and Reporting1 violation, Mar 2024 to Mar 2024
Monitoring and Reporting: 1 violation, Mar 2024 to Mar 2024. The system did not complete required monitoring, or did not report the results on time. This does not show that a contaminant was found.
What the rule requires: All systems using surface water (rivers, lakes, reservoirs) or groundwater under surface influence (GWUDI) must filter and disinfect. Treatment technique violations mean the system failed to maintain adequate disinfectant residual, exceeded turbidity limits, or lacked required permits. Snowmelt and storm events can raise turbidity and pathogen loads in surface water.
About this rule
Stage 1 Disinfectants and Disinfection Byproducts Rule
Monitoring and ReportingTreatment Technique Violation
Health-based
6 violations, Jan 2024 to Jun 2026 · 3 contaminants
Stage 1 Disinfectants and Disinfection Byproducts Rule
Monitoring and ReportingTreatment Technique Violation Health-based6 violations, Jan 2024 to Jun 2026 · 3 contaminants
Treatment Technique Violation, health-based: 4 violations, Jan 2024 to Jun 2026. The system did not carry out a required treatment process or corrective action.
Monitoring and Reporting: 2 violations, Mar 2024 to May 2024. The system did not complete required monitoring, or did not report the results on time. This does not show that a contaminant was found.
Contaminants on the record: Chlorine dioxide, Chlorite, Carbon, Total.
Chlorite, health effects: Elevated chlorite in drinking water can cause hemolytic anemia by oxidizing red blood cell membranes. Infants, young children, pregnant women, and individuals with glucose-6-phosphate dehydrogenase (G6PD) deficiency are especially sensitive. Chronic low-level exposure may also affect the nervous system. Most violations reflect localized high levels at specific monitoring points. Limit: 1.0 mg/L (1,000 ppb)
Stage 2 Disinfectants and Disinfection Byproducts Rule
Maximum Contaminant Level Violation
Health-based
1 violation, Apr 2026 to Jun 2026 · Total Haloacetic Acids (HAA5) · 63.6 UG/L
Stage 2 Disinfectants and Disinfection Byproducts Rule
Maximum Contaminant Level Violation Health-based1 violation, Apr 2026 to Jun 2026 · Total Haloacetic Acids (HAA5) · 63.6 UG/L
Maximum Contaminant Level Violation, health-based: 1 violation, Apr 2026 to Jun 2026. A sample exceeded the maximum contaminant level EPA allows in drinking water.
Limit 60 UG/L · Apr to Jun 2026
Contaminant on the record: Total Haloacetic Acids (HAA5).
Total Haloacetic Acids (HAA5), health effects: Dichloroacetic acid is a probable human carcinogen (Group B2). Long-term exposure to trichloroacetic acid may also increase cancer risk. Animal studies show liver, kidney, and reproductive effects at high doses. Limit: 0.060 mg/L (60 ppb) locational running annual average (LRAA)
Lead and Copper Rule Revisions
Reporting Violation
1 violation, Jul 2025 to Aug 2025
Lead and Copper Rule Revisions
Reporting Violation1 violation, Jul 2025 to Aug 2025
Reporting Violation: 1 violation, Jul 2025 to Aug 2025. The system did not report required information on time.
What the rule requires: The 2021 LCRR updated the 1991 LCR with mandatory lead service line inventories and replacement planning, a new 'trigger level' at 10 ppb requiring optimization, and strengthened public education. The 2024 Lead and Copper Rule Improvements (LCRI) further requires replacing all lead service lines within 10 years.
About this rule
Public Notice Rule and Revised PN Rule
Other Violation
2 violations, Jul 2024 to Apr 2026 · Public Notification Rule
Public Notice Rule and Revised PN Rule
Other Violation2 violations, Jul 2024 to Apr 2026 · Public Notification Rule
Other Violation: 2 violations, Jul 2024 to Apr 2026. A requirement other than monitoring, reporting, or a contaminant limit, such as public notice or the annual water quality report.
Contaminant on the record: Public Notification Rule.
Lead and copper at the tap
The 90th percentile of the tap samples the system collected in its latest monitoring period, against EPA's action level. Levels vary between homes.
Action level 0.015 mg/L · Jan 2023 to Dec 2025
About this data
Rules violated and the list above come from EPA's SDWIS violation records, one row per violation and contaminant, grouped by the rule each row belongs to. A violation counts when its non-compliance period ended on or after Jul 1, 2023, the start of the thirteen quarters ECHO's three-year figures cover, or is still open; it is unresolved when it was still open at EPA's data refresh on Oct 7, 2026. EPA's rule code 500, "Not Regulated", is left out, as in ECHO's counts. Each rule's violation count is EPA's, and one rule can carry several: a missed monitoring round for a group of contaminants is one violation per contaminant and period. Category names are EPA's violation categories.
ECHO's own summary count of rules violated agrees with this grouping for 98.8% of active systems nationally, and its count of rules being violated for 98.7%; where they differ, the figures here follow the rows listed.
A measured value shown with a rule is the sample result EPA recorded with that violation (SDWIS viol_measure), against the limit EPA recorded on the same row (state_mcl), both in EPA's unit as written; violations without a recorded value, such as missed monitoring, show none. Other measured contaminant levels are not part of this record; each system publishes them in its annual Consumer Confidence Report.
Lead and copper are the newest 90th-percentile results in EPA's SDWA data download (LCR_SAMPLES, codes PB90 and CU90): for each monitoring period a system reports the 90th-percentile value of its tap samples, which EPA compares with its action level of 0.015 mg/L for lead and 1.3 mg/L for copper (40 CFR 141.80). A result is not a measurement of any one tap.
Service area from EPA's Public Water System Service Area Boundaries dataset: Decision Tree method, Federal agency. The system's location is the centre of the service area EPA publishes for the system.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Missouri records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.