Total Coliform in Drinking Water
Reference information plus historical EPA compliance records associated with total coliform.
EPA Limit (MCL)
N/A presence
EPA Goal (MCLG)
0 presence
Category
Microbiological
Regulatory values are a concise reference, not legal or medical advice. Confirm the current standard and rule-specific details on EPA.gov.
Health Effects
Indicates possible presence of harmful bacteria
Common Sources
Naturally present in the environment
Treatment Considerations for Total Coliform
Commonly cited treatment approaches include: Disinfection (chlorine, UV). Choose treatment only after a certified water test identifies the substance and concentration; verify NSF/ANSI certification and consult a qualified local professional when needed.
9,936
Historical Violation Records
3,286
Systems With Records
Historical Total Coliform Records by State
| State | Records | Systems |
|---|---|---|
| Florida | 4,424 | 893 |
| Oregon | 725 | 276 |
| Alaska | 635 | 57 |
| Puerto Rico | 542 | 93 |
| Oklahoma | 485 | 195 |
| Connecticut | 432 | 158 |
| Utah | 286 | 144 |
| Colorado | 270 | 120 |
| Montana | 245 | 123 |
| Missouri | 191 | 121 |
| Texas | 147 | 113 |
| New Mexico | 145 | 77 |
| Virginia | 122 | 70 |
| South Carolina | 121 | 76 |
| Pennsylvania | 112 | 82 |
| Arizona | 112 | 74 |
| Vermont | 111 | 62 |
| North Carolina | 110 | 77 |
| Ohio | 82 | 63 |
| Arkansas | 67 | 50 |
Systems With the Most Total Coliform Violation Records
GRAYLING WATER SYSTEM
RIVIERA BEACH UTILITY DISTRICT, CITY OF
ALAKANUK WATER SYSTEM
AKUTAN
FORT LAUDERDALE, CITY OF
NATIVE VILLAGE OF SLEETMUTE
NUNAM IQUA WATER SYSTEM
LANCE WATER
KWIGILLINGOK WASHETERIA
QUINHAGAK WATER SYSTEM
Frequently Asked Questions
What is Total Coliform and why can it appear in drinking-water records?
Total Coliform can be associated with drinking water through: Naturally present in the environment.
What reference value does this page show?
The summarized EPA Maximum Contaminant Level is not established presence. Some substances use action levels or rule-specific thresholds instead, so verify the current EPA standard.
Does a historical violation record mean it is in my tap today?
No. A compliance record may be historical or resolved. Use the latest Consumer Confidence Report or a certified test for current local conditions.