B77/100
BOULDER CITY OF — Water Quality Report 2026
Serving 166,080 people · Colorado
Water Source
Surface Water
County
—
System ID
CO0107152
Violations
8
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
2
Violations (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Missed required monitoring deadline
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: October 1, 2024 – October 31, 2024Rule: Surface Water Treatment RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved
Failed to complete routine monitoring
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: June 1, 2022 – June 30, 2022Rule: Surface Water Treatment RuleEnforcement: Resolving — corrective action underway
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About BOULDER CITY OF
Is BOULDER CITY OF water safe to drink?
BOULDER CITY OF water receives a grade of B (77/100), which is considered good. Out of 76 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has BOULDER CITY OF detected?
76 contaminants were tested in BOULDER CITY OF's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does BOULDER CITY OF have any EPA violations?
Yes, BOULDER CITY OF has 8 EPA violation(s) on record, with the most recent in 2024. Violation types include MR, MCL, TT. 3 are health-based violations.
How many people does BOULDER CITY OF serve?
BOULDER CITY OF serves approximately 166,080 people, Colorado.
What type of water does BOULDER CITY OF provide?
BOULDER CITY OF sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is CO0107152.
How does BOULDER CITY OF compare to other utilities in Colorado?
BOULDER CITY OF scores 77/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our Colorado state page for a full comparison of water systems.