National Drinking Water Database
Colorado
1 systems serving 1,994,305 people
This drinking water quality report shows results of tests conducted by water utilities in Colorado, provided to the Environmental Working Group (EWG) by the State water agency. It is part of EWG's national database that includes 47,667 drinking water utilities and 20 million test results from 45 states and the District of Columbia. Water utilities nationwide detected more than 300 pollutants between 2004 and 2009. More than half of these chemicals are unregulated, legal in any amount. Despite this widespread contamination, the federal government invests few resources in protecting rivers, reservoirs, and groundwater from pollution in the first place. The information below summarizes drinking water quality for this state.
The state water agency did not respond to requests for water quality test data. Contact your water utility for the latest water quality report
Violation Summary for Colorado
Data from the U.S. Environmental Protection Agency includes the following violations of federal standards in Colorado since 2004
| Violation Type | Number of Violations |
|---|---|
| Failure to monitor regularly | 11,060 |
| Monitoring and Reporting Disinfection Byproduct Rule | 1,034 |
| Failure to monitor, Routine Major (Coliform bacteria) | 678 |
| Over maximum contaminant level, Average | 420 |
| Follow-up and Routine Tap Sampling | 376 |
| Failure to report information to the public or state agency in the Consumer Confidence Report | 373 |
| Failure to monitor, Routine Minor (Coliform bacteria) | 131 |
| Treatment Technique (Surface Water Treatment Rule) | 124 |
| Maximum contaminant level, Monthly (Coliform bacteria) | 112 |
| Failure to monitor or report, Routine/Repeat (Indicators of microbial or virus contamination) | 110 |
| Failure to monitor: Check/Repeat/Confirmation sampling | 94 |
| Initial Tap Sampling for Lead and Copper | 62 |
| Filter Turbidity Reporting | 59 |
| Excess Turbidity at 0.3 NTU | 55 |
| Failure to monitor, Repeat Major (Coliform bacteria) | 44 |
| Treatment Technique Precursor Removal | 31 |
| Failure to monitor, Repeat Minor (Coliform bacteria) | 18 |
| Excess Turbidity at 1 NTU | 17 |
| Over maximum contaminant level, Single Sample | 16 |
| Initial Water Quality Parameter Monitoring and Reporting | 9 |
| Public Notification Violation for National Primary Drinking Water Regulations | 8 |
| Optimal Corrosion Control Treatment Study Recommendation | 8 |
| Initial, Follow-up, or Routine Source Water Treatment Monitoring and Reporting | 7 |
| Maximum contaminant level, Acute (Coliform bacteria) | 6 |
| Public Education | 5 |
| Failure to Filter (Surface Water Treatment Rule) | 5 |
| Other Non-National Primary Drinking Water Regulations Potential Health Risks | 1 |
| Inadequate reporting of information to the public | 1 |