Contaminant 2257 in U.S. Drinking Water
Health-based violation data for Contaminant 2257 from EPA Safe Drinking Water Information System (SDWIS). Covers all community water systems with violations on record.
Contaminant 2257 has been found in violation of EPA standards in 7 water systems across 1 states, with 15 total health-based violations recorded. The most affected states are Iowa.
Contaminant 2257 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, SDWIS records show 15 health-based violations for Contaminant 2257 affecting 7 community water systems in 1 state. Violation counts cluster heaviest in Iowa, with Iowa alone accounting for 12 violations across 5 systems. The contaminant is listed on the federal primary drinking water regulations.
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 Contaminant 2257.
| # | State | Violations | Systems Affected |
|---|---|---|---|
| 1 | Iowa | 12 | 5 |
Most Affected Water Systems
Top 50 water systems by number of Contaminant 2257 health-based violations.
| Water System | State | Violations |
|---|---|---|
| SIOUX CITY WATER SUPPLY | IA | 6 |
| MADRID WATER DEPARTMENT | IA | 2 |
| CRESTON WATER SUPPLY | IA | 2 |
| OSCEOLA WATER WORKS | IA | 1 |
| ZEARING WATER DEPARTMENT | IA | 1 |
Frequently Asked Questions
Is Contaminant 2257 in my water?
Contaminant 2257 has been detected in violation of EPA health standards in 7 water systems across 1 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 Contaminant 2257 violations?
EPA SDWIS records show 7 community water systems with health-based Contaminant 2257 violations, totaling 15 violations. These represent cases where the contaminant exceeded the EPA Maximum Contaminant Level (MCL).
Which states have the most Contaminant 2257 violations?
The states with the most Contaminant 2257 violations are: Iowa (12 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 U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.