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WaterSafeCheck

Louisville, CO Tap Water Quality

Water safety reports for all 2 ZIP codes in Louisville, Colorado

Average Score

66/100

Health Violations

4

ZIP Codes

2

High Lead Risk

0

of 2 ZIP codes

C

About Tap Water in Louisville, CO

Water quality in Louisville, CO is currently rated with a moderate C grade (average score: 66/100 across 2 ZIP codes). This rating indicates that while the water provided by City of Louisville is treated and regulated, there have been notable compliance issues or contaminant detections recently. Residents should stay informed about the specific challenges affecting their local supply.

Over the past 5 years, Louisville has recorded 4 health-based violations. While occasional violations can occur due to seasonal changes or temporary infrastructure issues, City of Louisville is legally required to resolve these quickly and notify the public via their annual Consumer Confidence Report. The city's water supply, primarily drawn from surface water, is treated to address these specific contaminants.

Fortunately, the modeled risk for widespread lead exposure in Louisville's municipal water is relatively low compared to national averages. However, because lead typically enters drinking water through the corrosion of older, individual home plumbing rather than the main supply lines, residents in homes built before 1986 should still exercise caution by running the tap before use.

Health-Based Contaminant Violations in Louisville

EPA records indicate that the following contaminants have exceeded Safe Drinking Water Act Maximum Contaminant Levels (MCLs) in Louisville water systems over the past 5 years.

Fecal ColiformE. coli

Note: The presence of a past violation does not necessarily mean current water is unsafe. Utilities are required to take corrective action. Review your Consumer Confidence Report for the latest status.

Water Quality by ZIP Code — Louisville, CO

Click any ZIP code for the full water quality report

C
80027

Louisville, CO

Score: 68/1002 violations
C
80028

Louisville, CO

Score: 64/1002 violations

Frequently Asked Questions — Louisville Water Quality

Is tap water safe to drink in Louisville, CO?+
Tap water in Louisville has a grade of C, indicating compliance concerns in recent years. Families with young children or pregnant women should consider using a certified NSF/ANSI 53 water filter for drinking and cooking.
What is the water quality score for Louisville?+
The average water quality score across 2 ZIP codes in Louisville, CO is 66/100. Scores are derived from EPA violation history, lead levels, enforcement actions, and infrastructure risk indicators. Individual ZIP codes may vary — search your specific ZIP above for a personalized report.
Does Louisville have lead in its tap water?+
Lead risk ratings in Louisville are relatively low based on EPA monitoring data. However, lead in home plumbing is a separate concern — if your home was built before 1986, individual tap testing is recommended.
How do I get the water quality report for Louisville?+
Each ZIP code in Louisville has a full water quality report on this site — click any ZIP code below. You can also get the annual Consumer Confidence Report (CCR) from your local water utility. The CCR is required to be published every year by July 1 and contains actual contaminant measurements and violation history.
Where does Louisville's tap water come from?+
Tap water in Louisville, CO primarily comes from surface water. Surface water systems treat water from rivers, lakes, or reservoirs using filtration, sedimentation, and disinfection before it reaches your tap.

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