Greeley City of
PWSID: CO0162321
This system has no unresolved violations. The most recent violation on record was 2025-07-01.
This system has more violations on record than 68% of water systems in Colorado.
Violation trend: 2.4 per year over the last 5 years, up from 0.4 per year in the previous 5.
System Details
| Population Served | 132,310 |
| Service Connections | 29,000 |
| Water Source | Surface Water |
| System Type | Community Water System |
| Owner | Local Government |
| Status | Active |
| City | Greeley |
| EPA ZIP on File | 80631 |
Lead & Copper Testing
| Contaminant | Level | EPA Action Level | Status |
|---|---|---|---|
| Lead (90th percentile) | 0.0074 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0069 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0064 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0059 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0055 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0049 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0046 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0043 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0042 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0030 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0028 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0019 mg/L | 0.015 mg/L | Below Action Level |
Violation History (15 total)
| Contaminant | Violation | Date | Health-Based | Status |
|---|---|---|---|---|
| 1009 | MR | 2025-07-01 | Major | Acknowledged |
| 5000 | MR | 2024-10-01 | Returned to Compliance | |
| 5000 | MR | 2024-10-01 | Returned to Compliance | |
| 1009 | MR | 2023-06-01 | Major | Returned to Compliance |
| 1009 | MR | 2023-06-01 | Major | Returned to Compliance |
| 1009 | MR | 2023-06-01 | Major | Returned to Compliance |
| 1009 | MR | 2021-05-01 | Major | Returned to Compliance |
| 1009 | MR | 2021-05-01 | Major | Returned to Compliance |
| 1009 | MR | 2021-05-01 | Major | Returned to Compliance |
| 1008 | MR | 2021-05-01 | Major | Returned to Compliance |
| 1008 | MR | 2021-05-01 | Major | Returned to Compliance |
| 1008 | MR | 2021-05-01 | Major | Returned to Compliance |
| 5000 | MR | 2020-07-01 | Returned to Compliance | |
| 5000 | MR | 2020-07-01 | Returned to Compliance | |
| 7000 | Other | 2006-07-01 | Returned to Compliance |
Understanding This Water System's Record
Greeley City of is a community water system water system that draws from surface water sources and serves a population of 132,310 in Greeley, Colorado. This page shows its complete compliance history as reported to the EPA's Safe Drinking Water Information System (SDWIS), the federal database that tracks every public water system in the United States.
What Do These Violations Mean?
Health-based violations mean the system exceeded an EPA maximum contaminant level (MCL) or failed to provide required treatment. These indicate potential health risks from contaminants like lead, arsenic, bacteria, nitrates, or disinfection byproducts. Non-health-based violations involve monitoring, reporting, or procedural requirements — the system missed a testing deadline or failed to notify customers, but contaminant levels were not necessarily unsafe.
What Should You Do?
Your water utility is required to publish an annual Consumer Confidence Report (CCR) that details test results and any violations. If your system has active health-based violations, consider a certified water filter rated for the specific contaminants involved. The contaminant guides on this site explain health risks and filter options for common pollutants. For the most current results, contact your water utility directly — EPA data can lag weeks or months behind real-time testing.