Manganese in U.S. Drinking Water
Health-based violation data for Manganese from EPA Safe Drinking Water Information System (SDWIS). Covers all community water systems with violations on record.
Manganese has been found in violation of EPA standards in 240 water systems across 25 states, with 7,056 total health-based violations recorded. The most affected states are Texas, New Mexico, Virginia.
Manganese 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 7,056 health-based violations for Manganese affecting 240 community water systems in 25 states. Violation counts cluster heaviest in Texas, New Mexico, Virginia, with Texas alone accounting for 2,995 violations across 39 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 Manganese.
| # | State | Violations | Systems Affected |
|---|---|---|---|
| 1 | Texas | 2,995 | 39 |
| 2 | New Mexico | 585 | 13 |
| 3 | Virginia | 567 | 5 |
| 4 | California | 453 | 17 |
| 5 | Arizona | 199 | 9 |
| 6 | Missouri | 88 | 3 |
| 7 | Georgia | 79 | 6 |
| 8 | Arkansas | 48 | 1 |
| 9 | Washington | 40 | 3 |
| 10 | Oklahoma | 34 | 15 |
| 11 | New Hampshire | 27 | 5 |
| 12 | Idaho | 15 | 2 |
| 13 | Montana | 13 | 1 |
| 14 | Wyoming | 6 | 1 |
| 15 | Kansas | 4 | 1 |
| 16 | Alabama | 3 | 2 |
| 17 | Wisconsin | 3 | 1 |
| 18 | Colorado | 2 | 1 |
| 19 | Pennsylvania | 2 | 2 |
| 20 | Delaware | 1 | 1 |
| 21 | Illinois | 1 | 1 |
| 22 | Iowa | 1 | 1 |
| 23 | Massachusetts | 1 | 1 |
| 24 | Oregon | 1 | 1 |
| 25 | Utah | 1 | 1 |
Most Affected Water Systems
Top 50 water systems by number of Manganese health-based violations.
Frequently Asked Questions
Is Manganese in my water?
Manganese has been detected in violation of EPA health standards in 240 water systems across 25 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 Manganese violations?
EPA SDWIS records show 240 community water systems with health-based Manganese violations, totaling 7,056 violations. These represent cases where the contaminant exceeded the EPA Maximum Contaminant Level (MCL).
Which states have the most Manganese violations?
The states with the most Manganese violations are: Texas (2,995 violations), New Mexico (585 violations), Virginia (567 violations), California (453 violations), Arizona (199 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.