Kentucky Tap Water Quality Rankings 2026: 42nd in Nation | WaterQ

Kentucky ranks 42nd out of 50 states in drinking water quality, receiving an average score of 66 and a grade of C. The state features 334 water systems serving its population, which have accumulated 15,698 violations. These statistics reflect significant opportunities for improvement in the state's water infrastructure and monitoring.

Key Findings for Kentucky

Reviewing EPA SDWIS data for 2026, here's what defines Kentucky's water quality landscape:

• In the eastern counties of the state, legacy coal mining operations in the Appalachian region can impact local groundwater and surface water quality with minerals and runoff. Infrastructure in these historic mining areas often requires modernization to properly filter out contaminants.
• Agricultural activities in the Bluegrass region can contribute to nutrient runoff, potentially elevating levels of nitrate and disinfection byproducts in community water supplies. Heavy fertilizer use on farms and livestock operations often drives these seasonal fluctuations.
• Many of the state's 334 public water systems face maintenance challenges due to aging infrastructure, which can lead to distribution system leaks and potential exposure to contaminants like lead from older service lines. Maintaining compliance with water quality standards remains a persistent challenge for these smaller systems.

Most Common Contaminants in Kentucky

Here's what Kentucky residents should know about the contaminants most relevant to their water:

Nitrate

Nitrate is a common pollutant in agricultural regions like the Bluegrass, often entering water sources via fertilizer runoff and animal waste. High levels can be harmful, particularly for infants, and require careful monitoring by local utilities.

Disinfection Byproducts

These chemical compounds form when chlorine or other disinfectants react with naturally occurring organic matter in surface waters. In areas with high organic runoff, systems may show elevated levels of these byproducts during warm months.

Lead

While public water sources are generally treated to prevent corrosion, lead can leach into drinking water from older household plumbing or lead service lines. This is a common concern in older residential areas across the state.

Kentucky's Best and Worst Cities for Water Quality

To see the specific water test results and violation histories for individual municipalities, please refer to the detailed city-by-city directory on our state page. Each local system faces unique geographic and infrastructure challenges that determine its specific water profile. Explore the full breakdown on our Kentucky water systems page.

What Kentucky Residents Should Do

Given Kentucky's 42nd place ranking, here's what matters most for residents:

1. Search for your local water system's annual Consumer Confidence Report (CCR) to review its compliance history and detected contaminant levels.
2. If your home relies on a private well, schedule regular water testing as wells are not regulated by the EPA and are susceptible to agricultural or mining runoff.
3. Consider installing an NSF-certified water filter tailored to target the specific contaminants, such as lead or disinfection byproducts, identified in your area.
4. Check the EPA's database for past violation records associated with your water provider to stay informed about utility performance.

Source: EPA SDWIS 2026 Compliance Data and WaterQ National Database. For more information on our ranking process, visit our state rankings page.