Water Quality in Louisville, KY: No Violations in Mapped EPA Records

Data: EPA Safe Drinking Water Information System (SDWIS)

Water Quality Overview

Louisville, Kentucky has directly mapped EPA water-system data for 33 ZIP codes. This page reports typed compliance facts and does not relabel the multi-source Home Safety Score as a drinking-water grade.

The available EPA records report no violations across 33 directly mapped ZIP records with reported counts for Louisville. This does not guarantee the absence of contaminants.

Lead Levels

The average of the reported 90th-percentile lead results across the ZIP codes of Louisville is 0.0012 mg/L; the EPA action level of 0.015 mg/L applies to a water system's own 90th-percentile result and is not a safety threshold (EPA's health goal for lead is zero). No exceedances appear among the 33 ZIP records with known lead status.

With 70% of homes built before 1986, Louisville has a higher-than-average risk of lead from older plumbing. Lead solder was banned in 1986, and homes built before this date may have lead in pipes, solder joints, or fixtures.

Water Systems Serving Louisville

Louisville is served by 6 community water systems regulated under the Safe Drinking Water Act. About 765,842 people live in the area (66 ZIP codes, Census); this is not the systems' reported service population.

Each water system is identified by a Public Water System ID (PWSID) and is required to:

• Test for over 90 regulated contaminants on a regular schedule
• Report results to the EPA and state regulators
• Issue an annual Consumer Confidence Report (CCR) to all customers
• Take corrective action when violations occur

EPA records list 4 enforcement actions against water systems serving Louisville. Enforcement actions range from informal compliance assistance to formal orders and penalties.

How to Check Your Water in Louisville

1. Enter your ZIP code on ZipCheckup to see your specific water system data, including contaminant levels and violation history

2. Request your CCR - your water utility must provide an annual Consumer Confidence Report with detailed test results for all monitored contaminants

3. Get a home test - certified kits cost $20–$50 and test for lead, bacteria, and common contaminants. Professional lab tests ($150–$400) cover a broader panel

4. Consider filtration - NSF-certified filters can remove specific contaminants. Reverse osmosis removes the broadest range; activated carbon is effective for chlorine and many organics

5. Check for advisories - monitor your local utility website and local news for boil water advisories or system alerts

EPA Enforcement History

The EPA and state regulators have taken 2 enforcement actions against water systems serving Louisville. Recent actions:

Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2021-06-04.

Louisville vs. Nearby Kentucky Cities

How Louisville's water quality compares to similar cities in Kentucky:

Recommended Water Filters for Louisville

Based on contaminants detected in Louisville's water supply, these filter types are recommended:

Granular Activated Carbon (GAC, whole-house or under-sink)

• Removes: Chlorine Residual (Chloramines)
• Effectiveness: 95-99%
• Cost range: $100–$600
• Certification: NSF/ANSI 42
• Recommended products:
  • Aquasana AQ-5200
  • Waterdrop Chubby Pitcher
  • Berkey Travel

Granular Activated Carbon (GAC, under-sink or whole-house)

• Removes: Haloacetic Acids
• Effectiveness: 60-80%
• Cost range: $100–$600
• Certification: NSF/ANSI 53
• Recommended products:
  • Aquasana AQ-5200
  • Aquasana EQ-1000 Rhino

Water Quality by ZIP Code in Louisville

EPA coverage and recorded violations can differ across Louisville's ZIP codes. Missing counts are shown as unavailable, not zero:

Common Questions About Louisville Water

These are the most common questions residents search for about water quality in Louisville, Kentucky:

Is Louisville water hard or soft? Water hardness varies by source. Louisville's 6 water systems use multiple sources. Check your ZIP code report for specific hardness data.

Can I drink Louisville tap water? City-level EPA records cannot determine safety at a specific tap. No health-based violations are recorded across 33 directly mapped ZIP records with known counts, but this is not a property-level safety guarantee.

What is the best water filter for Louisville? Based on detected contaminants, a granular activated carbon (gac, whole-house or under-sink) filter is most recommended. See our Water Filter Matcher for personalized recommendations.

Louisville vs. Kentucky Average

Understanding how Louisville compares to the broader Kentucky average helps contextualize your local water quality. Factors like water source, treatment methods, and infrastructure age all contribute to differences between cities in the same state.

To see how individual neighborhoods compare, check the ZIP code reports below - water quality can vary significantly even within Louisville.

ZIP Codes in Louisville

Louisville spans 66 ZIP codes. EPA water-system coverage is available for 33 directly mapped ZIP codes. Check each ZIP code for detailed contaminant data, violation history, and system information.

Data Sources

• Water quality: EPA Safe Drinking Water Information System (SDWIS)
• Lead/copper: EPA Lead and Copper Rule sampling data
• Radon: EPA Map of Radon Zones
• Enforcement: EPA ECHO database
• Filter recommendations: NSF/ANSI certified products

Source reporting periods vary. See each cited source for its publication schedule.