Louisville Drinking Water Quality
What's Really in Your Tap Water?
Louisville tap water meets EPA standards, though there are a few things worth knowing. With 130.5 ppm hardness (7.6 gpg), expect some mineral deposits over time. Lead levels test well below the EPA action level. PFAS chemicals were detected but are within EPA limits. No violations have been recorded in the past 3 years.
Generally Safe
Minor compliance issues
7.6 GPG hardness
Lead
Below EPA action level
EPA action level: 15 ppb
Hardness
Hard water
US Average: 100 ppm
Is Louisville Tap Water Safe to Drink?
Louisville tap water meets EPA health standards, with some contaminants worth monitoring.
7 contaminants were tested in Louisville's water. 6 were detected — all within EPA limits.
PFAS "Forever Chemicals" — 1 PFAS compound detected, all within current EPA limits. Highest: PFOA at 0.95 ppt.
Disinfection Byproducts — 2 contaminants detected, all within EPA limits. Highest: Total Trihalomethanes (TTHM) at 32.1 ppb (40% of EPA limit).
Inorganic Chemicals — 2 contaminants detected, all within EPA limits. Highest: Fluoride at 0.685 ppm (17% of EPA limit).
Lead — Lead (1.1 ppb) is at 7% of the EPA action level of 15 ppb.
The data below shows test results from 1 water utility serving 765K people in the Louisville area.
Based on publicly available data from Louisville Water Company 2024 Water Quality Report (2024). Water quality can vary by location, building plumbing, and over time. This assessment reflects compliance with federal EPA standards and is not medical advice.
Do I Need a Water Filter?
PFAS chemicals were detected in Louisville water, though within current EPA limits. An activated carbon or reverse osmosis filter can further reduce PFAS exposure. With hard water (130.5 ppm), a water softener can reduce scale buildup in pipes, appliances, and water heaters.
How Louisville Compares
Compared to 51 major US cities based on 2024 Consumer Confidence Report data
Lead (90th percentile)
National avg: 2.85 ppb
1.1 ppb
61% below average
Water Hardness
National avg: 127.2 ppm
115 ppm
Near average
PFAS Contamination
Detected in 33% of major US cities
Detected
33% of cities have detectable PFAS
How Hard is Louisville Water?
130.5 ppm
7.6 grains per gallon
Hard water can cause scale buildup in pipes and appliances. A water softener may be beneficial.
Impact on Your Home
Shower
May dry out skin & hair
Kitchen
Spots on dishes
Laundry
Clothes may feel stiff
Appliances
Scale buildup
Regional Comparison
Values in ppm (mg/L as CaCO₃)
Do I Need a Water Softener?
At 130.5 ppm, Louisville has hard water. You may notice white spots on dishes, dry skin after showering, and mineral buildup on fixtures. A water softener can help reduce these effects. Hard water is generally not a health concern according to the WHO.
Want to verify your home's exact hardness level? See our best water hardness test kits.
Range: – ppm
Based on 52 samples from Louisville Water Company 2024 Water Quality Report (2024)
Your pipes tell a different story
The data above shows what leaves the treatment plant—not what comes out of your faucet. Old pipes, lead solder, and building plumbing can add contaminants the city never tests for. Know exactly what's in your Louisville tap water.
Home test kits detect lead, bacteria, pesticides, and 100+ other contaminants. Results in 5-10 business days from certified labs.
Lead & Contaminants
Understanding lead levels and water quality violations in Louisville
Lead Test Results
90th Percentile Lead Level
1.1 ppb
Louisville lead levels are well below the EPA action level.
Regular testing is still recommended, as lead can enter water through household plumbing.
Last sampled: 2023-12-31
About Lead in Drinking Water
What is Lead in Water?
According to the EPA, lead is a toxic metal that can dissolve into drinking water from older pipes, solder, and fixtures. It's invisible, tasteless, and odorless, making testing the only way to detect it. The EPA has set an action level of 15 ppb and states there is no safe level of lead exposure.
Potential Health Effects
According to the CDC: developmental delays, learning difficulties, lower IQ, behavioral issues
According to the EPA: high blood pressure, kidney damage, reproductive issues
How to Reduce Exposure
- •Run water for 30 seconds to 2 minutes before drinking, especially in the morning
- •Use cold water for cooking and drinking (hot water dissolves more lead)
- •Install a NSF-certified filter designed to remove lead
- •Test your water, especially if your home was built before 1986
PFAS “Forever Chemicals”
PFAS detected but within current EPA limits
PFAS are synthetic chemicals that don't break down in the environment. Levels are within current EPA maximum contaminant levels.
Chloramines (Disinfectant)
68% of EPA limit
Range: 1.7–3.18 ppm
Other Detected Contaminants
7 contaminants detected
| Contaminant | Your Water | Limit (MCL) | Status |
|---|---|---|---|
32.1 ppb Range: 13.9-39.7 Maximum LRAA 32.1 ppb. Distribution system average. Chloramine disinfection. | 80 ppb | Safe 40% of limit | |
23.5 ppb Range: 4.1-32.3 Maximum LRAA 23.5 ppb. Distribution system average. | 60 ppb | Safe 39% of limit | |
Chloramines (Disinfectant) | 2.71 ppm Range: 1.7-3.18 Chlorine + ammonia (chloramines) used as secondary disinfectant. RAA 2.71 ppm, well below MRDL 4.0. | 4 ppm | Caution 68% of limit |
0.95 ppt Range: 0-1.9 Crescent Hill WTP: 1.9 ppt; B.E. Payne WTP: 0 ppt. Annual average ~0.95 ppt. Louisville Water uses Powdered Activated Carbon (PAC) for PFAS removal. Note: UCMR5 showed max 7.5 ppt (single sample, earlier monitoring period). | 4 ppt 0 | Safe 24% of limit | |
0 ppt Range: 0-0 ND at both Crescent Hill and B.E. Payne WTPs. 2024 compliance monitoring. | 4 ppt 0 | Safe | |
0.685 ppm Range: 0.66-0.71 Crescent Hill 0.66 ppm, B.E. Payne 0.71 ppm. Fluoride added for dental health. Optimal range 0.6-1.2 ppm. | 4 ppm | Safe 17% of limit | |
1 ppm Range: 0-1 Crescent Hill max 1.00 ppm, B.E. Payne max 0.50 ppm. Well below MCL 10 ppm. | 10 ppm | Safe 10% of limit |
MCL = Maximum Contaminant Level (EPA legal limit)
EPA Compliance History
Excellent Record
No violations in past 3 yearsThis utility has maintained full EPA compliance. No action needed, but regular home testing is still recommended.
3-Year Violation Summary
0
Total Violations
0
Health-Related
0
Administrative
Health-Related Violations
Contaminant exceeded EPA maximum contaminant levels. The EPA recommends considering certified filtration.
Administrative Violations
Missed testing deadlines or reporting. Does not indicate water quality issues.
Who Provides Louisville's Water?
Utility Name
LOUISVILLE WATER COMPANY
EPA System ID (PWSID)
KY0560258
Primary Water Source
Surface Water
Population Served
765K
Frequently Asked Questions
Common questions about Louisville tap water quality
Nearby Cities in Kentucky
Northern Kentucky
Boone Co
Very Hard water
Paducah
Moderate water
Owensboro
Bowling Green
Frankfort Plant Board
This data is for informational purposes only. Water quality can vary by neighborhood and building. For official reports, contact your local water utility or the EPA. Learn about our methodology
Data source: Louisville Water Company 2024 Water Quality Report (2024) • View report