Thallium, Total in U.S. Drinking Water
Health-based violation data for Thallium, Total from EPA Safe Drinking Water Information System (SDWIS). Covers all community water systems with violations on record.
Thallium, Total has been found in violation of EPA standards in 11 water systems across 5 states, with 51 total health-based violations recorded. The most affected states are Florida, Missouri, New Mexico.
Thallium, Total is regulated under the EPA Safe Drinking Water Act, which sets enforceable Maximum Contaminant Levels (MCLs) and associated treatment technique requirements for public water systems. The EPA Safe Drinking Water Information System (SDWIS) tracks every recorded violation nationwide and links it back to the specific public water system (PWSID), violation type, and begin date.
Across the United States, PlainEnviro's joined extract contains 51 health-based violation records carrying Thallium, Total (EPA code 1085) across 11 active community water systems in 5 states. Raw record counts are highest in Florida, Missouri, New Mexico, with Florida accounting for 13 records across 3 systems. Health-effect prose is shown only when the official ECHO substance name matches a verified topic; otherwise the portal stays silent rather than inventing guidance.
A health-based violation does not mean residents were necessarily harmed, it means the contaminant exceeded the federal MCL in a compliance sample, triggering notification and remediation requirements. States and utilities maintain primary enforcement responsibility. To check the status of a specific water system, request its most recent Consumer Confidence Report or consult the EPA's Drinking Water Watch portal for the corresponding state.
Violations by State
States ranked by number of health-based violations for Thallium, Total.
| # | State | Violations | Systems Affected |
|---|---|---|---|
| 1 | Florida | 13 | 3 |
| 2 | Missouri | 12 | 1 |
| 3 | New Mexico | 10 | 1 |
| 4 | Arizona | 4 | 1 |
| 5 | Pennsylvania | 1 | 1 |
Most Affected Water Systems
Top 50 water systems by number of Thallium, Total health-based violations.
| Water System | State | Violations |
|---|---|---|
| LEBANON PWS | MO | 12 |
| ARTESIA RURAL WATER COOPERATIVE | NM | 10 |
| CHERRY LAKE UTILITIES | FL | 5 |
| PLANTATION OAKS MH ; RV COMMUNITY | FL | 5 |
| COTTONWOOD MUNICIPAL WATER VV2 | AZ | 4 |
| PORT OF THE ISLANDS | FL | 3 |
| ALTOONA WATER AUTHORITY | PA | 1 |
Frequently Asked Questions
Is Thallium, Total in my water?
Thallium, Total has been detected in violation of EPA health standards in 11 water systems across 5 states. To check your specific utility, look up your annual Consumer Confidence Report (CCR) - water systems are required to disclose all violations.
How many water systems have Thallium, Total violations?
EPA SDWIS records show 11 community water systems with health-based Thallium, Total violations, totaling 51 violations. These represent cases where the contaminant exceeded the EPA Maximum Contaminant Level (MCL).
Which states have the most Thallium, Total violations?
The states with the most Thallium, Total violations are: Florida (13 violations), Missouri (12 violations), New Mexico (10 violations), Arizona (4 violations), Pennsylvania (1 violations).
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About This Data
Violation data is from the EPA Safe Drinking Water Information System (SDWIS). Only health-based violations are shown, these include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations. Monitoring and reporting violations are excluded. Data may not reflect the most current enforcement actions.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.