Kentucky Private Well Water Quality 2026

Kentucky’s “Dirty Water Act” — What SB 89 Means for Well Owners

In March 2025, the Kentucky General Assembly overrode Governor Andy Beshear’s veto to pass Senate Bill 89 into law. The legislation fundamentally narrowed the definition of “waters of the commonwealth” — removing state pollution protections from most groundwater, headwater streams, and wetlands that don’t meet the federal definition of “navigable waters.”

The consequences for private well owners are significant. Kentucky’s own Energy and Environment Cabinet stated in writing that the bill as passed would leave approximately 89,000 domestic use and agricultural wells — as well as 156 public water systems drawing from groundwater — without the state’s most important pollution safeguards. The cabinet secretary described it as a law that “applies a machete to an issue that needs a scalpel.” Environmental groups labelled it the “Dirty Water Act.” A separate cabinet letter to House members specifically cited the water quality of “more than 31,000 private use wells” as directly at risk.

Before SB 89, Kentucky law had protected “all rivers, streams, creeks, lakes, ponds, impounding reservoirs, springs, wells, marshes, and all other bodies of surface or underground water” for 75 years. That broad language is now gone. As a result, industrial polluters — including coal mining companies, a primary backer of the bill — face fewer barriers to discharging into groundwater sources that feed private wells.

For eastern and western Kentucky in particular — where private wells are most concentrated and coal mining most intensive — this legislative change compounds already documented contamination risks. The Kentucky Resources Council, which led opposition to the bill, states plainly that SB 89 “fails to protect almost all rural Kentucky’s households and farms that rely on private wells.”

PFAS Contamination Near Fort Campbell

PFAS contamination is a documented and serious concern for Kentucky well owners near military installations. Fort Campbell — the US Army base straddling the Kentucky-Tennessee border in Christian County — has been identified as the source of the highest PFAS contamination levels recorded at any Kentucky public water system. According to EPA UCMR 5 data reported in March 2026, the Fort Campbell Water System’s average PFOS levels measured 6.2 times over the federal limit of 4 parts per trillion.

A 2020 state surface water monitoring study found the highest single PFAS detection in Kentucky — 249 ppt — in Christian County, at a monitoring station in the Cumberland River Basin downstream of the base. A 2024 study by the Kentucky Department for Environmental Protection Division of Water again identified Christian County as having the highest PFAS levels in the state. Private wells in the Oak Grove community adjacent to Fort Campbell showed PFAS contamination above the EPA’s 4 ppt limit in 2023 EWG sampling.

The source of contamination is aqueous film-forming foam (AFFF), used for decades during firefighting training exercises on the base. PFAS from this foam has migrated into groundwater surrounding the installation. Nationally, nearly 3,000 private wells near 63 active and former US military bases have been found to contain PFAS above the EPA’s 4 ppt limit. As of 2026, 10 public water systems serving Kentucky customers have recorded average PFOA or PFOS levels exceeding the federal standard — private wells in those same areas face equivalent or greater risk, with no mandatory testing or treatment requirement.

PFAS exposure is linked to multiple cancers, thyroid disease, immune system disruption, and reproductive harm. The contamination is colourless, odourless and tasteless — it is undetectable without laboratory testing.

Coal Ash Arsenic — A Kentucky-Specific Risk

Kentucky is one of the nation’s largest coal-producing and coal-consuming states, and that legacy has created a documented groundwater contamination problem affecting private wells near power plants. A WFPL News and Ohio Valley ReSource investigation found contaminated groundwater at all 14 Kentucky power plants covered by EPA coal ash rules at the time. Seven of those 14 sites recorded arsenic levels exceeding federal drinking water standards in monitoring wells.

The most severe cases identified in that investigation include:

• Mill Creek Generating Station, Louisville — monitoring wells showed arsenic at up to 40 times the federal drinking water standard. The plant’s coal ash pond has been in the process of closure, but capping in place does not immediately end groundwater contamination.
• Paradise Fossil Plant, Muhlenberg County — arsenic levels more than eight times the federal standard were recorded in groundwater. The plant is owned by the Tennessee Valley Authority.
• Ghent Generating Station, Carrollton — radium levels at 33 times the drinking water standard near the ash pond, with elevated arsenic, antimony and beryllium also detected.

The contamination picture has grown since that investigation. Under the 2024 EPA Legacy Coal Ash Rule, power plant owners in Kentucky are now required to report on an additional 44 older coal ash dumps that were previously excluded from monitoring requirements — sites that Earthjustice notes have been leaking into groundwater for decades without formal oversight. For all but one Kentucky plant that has conducted groundwater monitoring, industry data shows contamination above federal drinking water standards.

Communities near coal ash disposal sites have no legal requirement to test their private wells for contamination, and there is no notification system for well owners. As Earthjustice attorney Abel Russ has stated: “There’s no legal protection for those people — they are stuck with what they are drinking.” In Eastern Kentucky’s coal mining regions, arsenic also occurs naturally in groundwater from coal-bearing shale geology, independent of the coal ash issue.

Nitrate, Bacteria and Karst Geology

In western and central Kentucky, agricultural nitrate contamination is a documented risk, especially in shallow wells. The state’s tobacco, corn and soybean farming generates significant fertiliser runoff that enters groundwater through soil percolation. High nitrate levels pose a serious risk to infants under six months and are associated with increased cancer risk in adults at sustained exposure.

Kentucky’s karst geology — characterised by porous limestone bedrock, sinkholes, and underground cave systems — creates a particularly fast pathway for surface contaminants to reach groundwater. Unlike aquifers in denser geology, karst systems provide minimal natural filtration. Pollutants from surface sources — fertiliser runoff, septic systems, coal ash leachate, and industrial discharge — can travel quickly and widely underground. The Pennyroyal region of south-central Kentucky, home to Mammoth Cave, sits entirely on this geology, and karst aquifers supplying drinking water to rural Kentuckians were specifically identified as unprotected under SB 89’s revised definition of waters of the commonwealth.

Bacteria contamination in Kentucky wells is common, particularly following heavy rainfall or flooding events — both increasingly frequent in the state. Older wells with damaged casings, or wells located close to septic systems, are at highest risk. A 2024 University of Kentucky watershed study identified 77 contaminants across the state’s waterways, with E. coli a widespread impairment in rivers and streams that feed the same groundwater systems private wells draw from.

Regulatory Situation for Kentucky Well Owners

Private wells in Kentucky are not regulated under the Kentucky Safe Drinking Water Act or its federal equivalent. There is no state requirement to test well water, no mandatory notification if contamination is discovered nearby, and no inspection regime for private well construction or condition. Testing and treatment are entirely the well owner’s responsibility.

The passage of SB 89 in 2025 significantly worsened this picture. By narrowing what counts as a “water of the commonwealth,” the law removed the state’s ability to regulate pollution in most groundwater — the source water for private wells. Kentucky’s Energy and Environment Cabinet is evaluating “process and program modifications” in response, but as of April 2026 no replacement protections have been established.

Kentucky has no state-level PFAS MCLs for drinking water — neither for public systems nor private wells. The state relies entirely on the federal EPA’s 4 ppt limits for PFOA and PFOS, with a compliance deadline for public water systems that the EPA has signalled may be pushed back to 2031. Private wells face no compliance requirement at any level.

For context on municipal water quality across the state, see our Kentucky municipal water quality page and our Louisville water quality page. Use our live boil water notice tracker for current active advisories across Kentucky.

Known High-Risk Areas in Kentucky

If you live near any of the following locations, well water testing is urgent — not precautionary.

How to Test Your Kentucky Well Water — and What to Do Next

Given the combination of PFAS near military installations, coal ash arsenic at power plant sites, agricultural nitrate in rural areas, and a karst geology that offers little natural filtration, every Kentucky private well owner should test their water regardless of location. The regulatory changes brought by SB 89 make self-testing more important than ever — the state now has fewer tools to protect your groundwater source, not more.

Contact your county health department for basic coliform testing, or use the Kentucky Division of Water’s certified lab list at eec.ky.gov. The Kentucky Geological Survey maintains a searchable groundwater quality database at kgs.uky.edu — useful for understanding baseline contamination levels in your county before you test.

For filter options, our well water filter guide covers reverse osmosis systems for PFAS and arsenic, UV disinfection for bacteria, and whole-house well systems for comprehensive treatment across multiple contaminants. You can also browse our full water filter solutions page or check your ZIP code for local municipal water quality context.

For neighbouring state well water risks, see our pages on Tennessee wells, Virginia wells, and Ohio wells. Return to the private well water directory to find your state.