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Drinking Water Data - Serious Violator Report
This report counts public water systems that are current serious violators. A serious violator is defined as a public water system with unresolved serious, multiple, and/or continuing violations, as identified by the quarterly application of US EPA's Drinking Water Enforcement Response Policy, that must either return to compliance or be addressed by a formal enforcement action within six months.
US EPA designates serious violators so that the drinking water system and the primacy agency will act quickly to resolve the most significant drinking water violations. Many public water systems with violations, however, are not serious violators. Operators and the primacy agencies are expected to correct the violations at non-serious violators as well, but without the more strict requirements and deadlines applicable to serious violators. If the violations at a non-serious violator are left uncorrected, that system may become a serious violator. When a serious violator has returned to compliance, it is no longer designated a serious violator. US EPA updates its serious violator list on a quarterly basis.
| State Territory Tribe |
Number of Public Water Systems | Number of Serious Violators | Percent of Serious Violators | Number of Serious Violators Percent of Serious Violators 0 200 400 600 800 1000 0% 20% 40% 60% 80% | |
|---|---|---|---|---|---|
| Alabama | 611 | 10 | 1.6% | ||
| Alaska | 1,546 | 93 | 6.0% | ||
| Arizona | 1,564 | 99 | 6.3% | ||
| Arkansas | 1,106 | 18 | 1.6% | ||
| California | 7,770 | 571 | 7.3% | ||
| Colorado | 2,045 | 13 | 0.6% | ||
| Connecticut | 2,573 | 44 | 1.7% | ||
| Delaware | 492 | 11 | 2.2% | ||
| Florida | 5,580 | 84 | 1.5% | ||
| Georgia | 2,435 | 30 | 1.2% | ||
| Hawaii | 130 | 0 | 0.0% | ||
| Idaho | 1,955 | 71 | 3.6% | ||
| Illinois | 5,594 | 58 | 1.0% | ||
| Indiana | 4,183 | 103 | 2.5% | ||
| Iowa | 1,921 | 18 | 0.9% | ||
| Kansas | 1,022 | 44 | 4.3% | ||
| Kentucky | 462 | 22 | 4.8% | ||
| Louisiana | 1,400 | 34 | 2.4% | ||
| Maine | 1,868 | 50 | 2.7% | ||
| Maryland | 3,496 | 17 | 0.5% | ||
| Massachusetts | 1,796 | 18 | 1.0% | ||
| Michigan | 11,188 | 11 | 0.1% | ||
| Minnesota | 7,089 | 0 | 0.0% | ||
| Mississippi (1) | 1,261 | 914 | 72.5% | ||
| Missouri | 2,783 | 82 | 2.9% | ||
| Montana | 2,108 | 22 | 1.0% | ||
| Nebraska | 1,324 | 16 | 1.2% | ||
| Nevada | 563 | 28 | 5.0% | ||
| New Hampshire | 2,427 | 34 | 1.4% | ||
| New Jersey | 3,874 | 81 | 2.1% | ||
| New Mexico | 1,181 | 36 | 3.0% | ||
| New York | 8,926 | 66 | 0.7% | ||
| North Carolina | 6,058 | 4 | 0.1% | ||
| North Dakota | 555 | 6 | 1.1% | ||
| Ohio | 4,856 | 90 | 1.9% | ||
| Oklahoma | 1,668 | 36 | 2.2% | ||
| Oregon | 2,596 | 150 | 5.8% | ||
| Pennsylvania | 9,163 | 78 | 0.9% | ||
| Rhode Island | 484 | 5 | 1.0% | ||
| South Carolina | 1,435 | 3 | 0.2% | ||
| South Dakota | 647 | 13 | 2.0% | ||
| Tennessee | 894 | 7 | 0.8% | ||
| Texas | 6,961 | 380 | 5.5% | ||
| Utah | 1,012 | 55 | 5.4% | ||
| Vermont | 1,361 | 56 | 4.1% | ||
| Virginia | 2,771 | 55 | 2.0% | ||
| Washington | 4,347 | 56 | 1.3% | ||
| West Virginia | 1,038 | 77 | 7.4% | ||
| Wisconsin | 11,416 | 44 | 0.4% | ||
| Wyoming | 800 | 3 | 0.4% | ||
| American Samoa | 19 | 7 | 36.8% | ||
| District of Columbia | 6 | 0 | 0.0% | ||
| Federated Territories of Micronesia | 0 | 0 | – | ||
| Guam | 9 | 2 | 22.2% | ||
| Marshall Islands | 0 | 0 | – | ||
| Northern Mariana Islands | 76 | 9 | 11.8% | ||
| Palau | 0 | 0 | – | ||
| Puerto Rico | 495 | 180 | 36.4% | ||
| Virgin Islands | 306 | 18 | 5.9% | ||
| EPA Region 1 Tribes | 6 | 0 | 0.0% | ||
| EPA Region 2 Tribes | 8 | 1 | 12.5% | ||
| EPA Region 3 Tribes | 0 | 0 | – | ||
| EPA Region 4 Tribes | 32 | 1 | 3.1% | ||
| EPA Region 5 Tribes | 106 | 2 | 1.9% | ||
| EPA Region 6 Tribes | 84 | 8 | 9.5% | ||
| EPA Region 7 Tribes | 13 | 0 | 0.0% | ||
| EPA Region 8 Tribes | 132 | 6 | 4.5% | ||
| EPA Region 9 Tribes | 322 | 50 | 15.5% | ||
| EPA Region 10 Tribes | 122 | 6 | 4.9% | ||
| Navajo Nation | 163 | 60 | 36.8% | ||
| 0 200 400 600 800 1000 0% 20% 40% 60% 80% | |||||
- Under the Safe Drinking Water Act Radionuclides Rule, all community water systems are responsible for monitoring for the presence of radioactive substances in their drinking water and reporting the results to the state. The State of Mississippi provides water testing services to all of its public water systems. Because Mississippi has to date supplied EPA with valid initial monitoring results for only a small number of its community water systems, almost all of the CWSs in the state have been in violation of the monitoring requirements of the Radionuclides Rule since early 2008.