Statewide Compliance and Testing

• Overall Compliance: Kentucky’s 435 public water systems maintain strong overall compliance with federal Safe Drinking Water Act standards. However, EPA UCMR 5 data released March 2026 — covering mandatory testing of all utilities between 2023 and 2025 — confirm 10 Kentucky systems have average PFOA or PFOS levels exceeding the 4 ppt federal MCL, a more precise and concerning picture than earlier state estimates.
• Named Systems Above Federal MCL: Kentucky Department for Environmental Protection data listed systems including Ashland (4.74 ppt PFOA), Augusta (4.43 ppt PFOA), Cynthiana (8.35 ppt PFOS), Georgetown (5.46 ppt PFOS), and Lewisport (Hancock County, 12.7 ppt) among those exceeding the 4 ppt limits. Fort Campbell Water System, operating across the Kentucky-Tennessee line, recorded the highest average — PFOS at 6.2 times the federal limit.
• Proactive State Testing: Kentucky’s Department for Environmental Protection has tested 91% of state water treatment plants for PFAS since its programme began in 2019, establishing one of the more comprehensive state-level PFAS datasets in the country. The Kentucky PFAS Explorer database allows residents to view results for finished drinking water, fish tissue, surface water, and groundwater.

Major Water Sources and Challenges

• Ohio River — Louisville and Downstream Communities: Louisville Water Company’s Crescent Hill facility detected a 15-fold spike in GenX (HFPO-DA) in late 2024, traced to Chemours’ Washington Works plant approximately 400 miles upstream in West Virginia. The highest single-month reading at Crescent Hill was 4.2 ppt in April 2025. Louisville is ramping up PFAS testing and treatment capabilities ahead of the 2031 compliance deadline. Paducah Water Works, also drawing from the Ohio River, reports PFOS at 1.5 times the federal MCL with variable monthly readings, and is planning granular activated carbon (GAC) treatment.
• Kentucky River Basin: Serves central Kentucky including the Lexington area through Kentucky American Water. Lexington continues to show chromium-6 levels averaging 76 parts per trillion — nearly four times higher than California’s health guideline of 0.02 ppb. No federal MCL for chromium-6 currently exists.
• Rural Groundwater and Eastern Kentucky: Around 5% of Kentuckians rely on private wells with limited monitoring. Eastern Kentucky faces particular challenges from historical coal mining contamination, as seen in Martin County’s ongoing water infrastructure difficulties. The Kentucky DEP provides guidance for private well owners through its PFAS and Private Wells programme.

PFAS Regulatory Landscape in 2026

• MCLs Confirmed and Enforceable: EPA’s PFOA and PFOS MCLs of 4 ppt, finalised in April 2024, remain in force. The Trump EPA confirmed in May 2025 it will retain these standards while extending the compliance deadline from 2029 to 2031. A federal court has denied the EPA’s request to eliminate four other PFAS drinking water limits (PFHxS, PFNA, HFPO-DA/GenX, PFBS). Water systems must complete initial monitoring by 2027 and report publicly. See our water filter guide for certified PFAS-removal options available now.
• Treatment Planning Underway: Affected utilities including Paducah Water Works are actively evaluating GAC as their primary PFAS treatment method. Lewisport conducted a $175,000 reverse osmosis pilot study and is assessing building a new $15 million treatment plant. Georgetown and Cynthiana are among the systems planning compliance upgrades ahead of 2031.
• Legal Action: Kentucky has joined lawsuits against chemical companies including DuPont de Nemours and 3M to recover PFAS contamination monitoring and treatment costs. Fort Campbell has faced separate PFAS litigation, with active cases pending. Manufacturer 3M agreed to pay more than $10 billion to drinking water providers nationally to settle PFAS litigation.

Rural and Disadvantaged Communities

• Targeted Federal Support: Kentucky has received over $22 million through the federal Emerging Contaminants in Small or Disadvantaged Communities Grant Programme, specifically addressing PFAS removal. These are grants rather than loans, ensuring communities are not burdened with additional debt for contamination they did not cause.
• South Shore Progress: South Shore — which recorded the highest PFAS levels in earlier statewide testing — has switched to an alternative water source as an interim measure while finalising a long-term solution, according to Kentucky DEP.
• System Coverage: Kentucky maintains approximately 95% statewide public water service coverage, with ongoing investments through the Kentucky Infrastructure Authority supporting system improvements and consolidation.

Looking Forward: 2026–2031

Kentucky’s water quality picture in 2026 is more complicated than the state’s historically strong compliance record suggests. The UCMR 5 data released in March 2026 confirm 10 systems above federal PFAS MCLs, with Fort Campbell — the most contaminated — facing active litigation and serving active military personnel and their families. Louisville Water is navigating a new GenX challenge tied to upstream industrial discharge, adding complexity to what was previously seen as one of the state’s cleaner large systems. All affected utilities now have until 2031 to achieve full compliance with enforceable PFOA/PFOS limits, with mandatory reporting required from 2027. The state’s proactive testing programme since 2019, combined with targeted federal funding and legal recovery efforts, gives Kentucky a stronger foundation than most states — but the work ahead is significant. For city-specific reports, see our pages on Louisville and Kentucky state overview.