Vinyl chloride in U.S. Drinking Water
Health-based violation data for Vinyl chloride from EPA Safe Drinking Water Information System (SDWIS). Covers all community water systems with violations on record.
Vinyl chloride has been found in violation of EPA standards in 7 water systems across 3 states, with 61 total health-based violations recorded. The most affected states are Oklahoma, New Mexico, North Carolina.
Vinyl chloride 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 61 health-based violation records carrying Vinyl chloride (EPA code 2976) across 7 active community water systems in 3 states. Raw record counts are highest in Oklahoma, New Mexico, North Carolina, with Oklahoma accounting for 31 records across 2 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 Vinyl chloride.
| # | State | Violations | Systems Affected |
|---|---|---|---|
| 1 | Oklahoma | 31 | 2 |
| 2 | New Mexico | 1 | 1 |
| 3 | North Carolina | 1 | 1 |
Most Affected Water Systems
Top 50 water systems by number of Vinyl chloride health-based violations.
| Water System | State | Violations |
|---|---|---|
| OKARCHE RWD, INC | OK | 28 |
| LEFLORE CO. RWD #3 | OK | 3 |
| CHEROKEE WATER SYSTEM | NC | 1 |
| VISTA REAL MHP | NM | 1 |
Frequently Asked Questions
Is Vinyl chloride in my water?
Vinyl chloride has been detected in violation of EPA health standards in 7 water systems across 3 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 Vinyl chloride violations?
EPA SDWIS records show 7 community water systems with health-based Vinyl chloride violations, totaling 61 violations. These represent cases where the contaminant exceeded the EPA Maximum Contaminant Level (MCL).
Which states have the most Vinyl chloride violations?
The states with the most Vinyl chloride violations are: Oklahoma (31 violations), New Mexico (1 violations), North Carolina (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.