Chloride in U.S. Drinking Water
Health-based violation data for Chloride from EPA Safe Drinking Water Information System (SDWIS). Covers all community water systems with violations on record.
Chloride has been found in violation of EPA standards in 201 water systems across 5 states, with 1,644 total health-based violations recorded. The most affected states are New York, Connecticut, California.
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 1,644 health-based violation records carrying Chloride (EPA code 1017) across 201 active community water systems in 5 states. Raw record counts are highest in New York, Connecticut, California, with New York accounting for 580 records across 52 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 Chloride.
| # | State | Violations | Systems Affected |
|---|---|---|---|
| 1 | New York | 580 | 52 |
| 2 | Connecticut | 46 | 1 |
| 3 | California | 30 | 1 |
| 4 | Delaware | 2 | 1 |
| 5 | North Carolina | 2 | 1 |
Most Affected Water Systems
Top 50 water systems by number of Chloride health-based violations.
Frequently Asked Questions
Is Chloride in my water?
Chloride has been detected in violation of EPA health standards in 201 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 Chloride violations?
EPA SDWIS records show 201 community water systems with health-based Chloride violations, totaling 1,644 violations. These represent cases where the contaminant exceeded the EPA Maximum Contaminant Level (MCL).
Which states have the most Chloride violations?
The states with the most Chloride violations are: New York (580 violations), Connecticut (46 violations), California (30 violations), Delaware (2 violations), North Carolina (2 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.