- The ACC clause is policy language generally providing that when an excluded peril contributes to a loss in any sequence, the entire loss may be excluded regardless of any other contributing cause. KY carriers cite it across flood, sewer-backup, and mixed-peril claims.
- The clause has real limits. It generally applies only when the excluded peril actually contributed to the specific damage — not where pure covered-peril damage occurred in isolation, or where the water source itself isn't actually within an excluded category.
- KY water-classification disputes often turn on which excluded category the water actually fits. The ACC clause modifies the underlying exclusion analysis — it doesn't substitute for it.
- When carrier conduct around ACC application meets the Wittmer standard — denial without reasonable basis, with knowledge or reckless disregard — the underlying claim may move toward bad-faith analysis with the 12% statutory interest, attorney's fees, and potentially punitive damages.
- At Property People Law, we read KY ACC clauses and identify where the carrier's argument exceeds what the clause actually supports. Our initial review is free; our KY residential and commercial property damage work is generally on contingency — we only get paid from the recovery, not your pocket.
Kentucky's anti-concurrent-causation analysis looks different than the coastal causation analysis in NC and SC because KY's water exposures are different. KY doesn't see hurricane storm surge. It sees inland river flooding, sewer backup from heavy rain overwhelming municipal systems, surface runoff from severe storms, and water damage from tornadoes and derechos. The ACC clause shows up in claims across all of these fact patterns — sometimes applied appropriately, sometimes stretched beyond what the clause actually supports.
Understanding how the ACC clause actually applies in the KY context requires understanding both the clause itself and the specific excluded perils KY claims most often involve — flood, sewer backup, earth movement, gradual seepage. The clause modifies these underlying exclusions but doesn't substitute for them. When a denial cites ACC, the first question is what excluded peril the clause is operating on — and whether that excluded peril actually contributed to the specific damage at issue.
This article walks through what the ACC clause says, how it applies across KY's three main water-related claim types (flood, sewer backup, tornado), how the Wittmer bad-faith analysis overlaps with aggressive ACC application, and how we at Property People Law approach KY ACC disputes. Every policy is different, every claim turns on its own facts.
What the ACC clause actually says in a typical KY policy
Most KY homeowners policies contain ACC language broadly similar to: "We do not insure for loss caused directly or indirectly by any of the following [excluded perils]. Such loss is excluded regardless of any other cause or event contributing concurrently or in any sequence to the loss."
Three structural features matter. First, the clause operates within the exclusions section — it modifies what's excluded, not what's covered. Second, the clause requires actual contribution by the excluded peril, even though carriers sometimes argue the clause applies based on mere temporal coincidence. Third, the clause applies to specific named perils — flood, earth movement, sewer or drain backup (in many policies), gradual seepage, and others — not to all losses generally.
Specific ACC language varies across KY carriers. Some clauses are broad. Some are narrower or only apply to specific excluded perils like flood. The general framework is consistent, but the specific words in your policy decide individual cases. Reading your policy's actual ACC clause and the specific exclusions it references is the first step in evaluating any ACC-based denial.
How the clause applies to KY flood claims
Standard KY homeowners policies generally exclude flood — defined typically as overflow of inland or tidal waters, unusual and rapid accumulation of surface waters, and mudslides caused by accumulated water. When the July 2022 and 2025 Eastern KY floods caused catastrophic damage across Perry, Knott, Letcher, Breathitt, Owsley, and Pike counties, many denials cited the flood exclusion alongside ACC.
The ACC analysis in flood denials generally tracks the coastal analysis with KY-specific variations. Pure covered-peril damage that occurred before flooding may not fall inside the clause. Wind damage to a roof during the same severe weather event that brought the flooding may stand as wind damage. Damage to upper stories above the flood line may not have been caused by flood physically. Wind-driven rain through wind-created openings may remain covered.
The first analytical step on a KY flood-related ACC denial is verifying what "flood" actually means under the specific policy. Not every water-source is flood under every policy. Heavy surface runoff that didn't come from a river or established water body may not fit the flood definition cleanly. Whether the water source was actually flood under the policy's definition is sometimes itself contestable.
How the clause applies to sewer-backup claims
Sewer or drain backup is one of the most common KY water-damage scenarios. Standard KY homeowners policies generally exclude sewer-backup loss unless a separate endorsement was purchased — and many policies don't have the endorsement. When the resulting basement water is denied under the sewer-backup exclusion, ACC may be cited to argue that any sewer-backup contribution excludes the entire loss.
The ACC analysis here gets interesting because the sewer-backup exclusion has a narrow physical scope. Water that actually came in through the sewer or drain system falls inside the exclusion. Water that came from other sources — through a wind-damaged roof, through wind-broken windows, through plumbing that failed inside the home — generally falls outside the sewer-backup exclusion and may remain covered. The ACC argument that any sewer-backup contribution excludes everything has limits when the water actually came from another source.
Plumber's reports, sewer-line inspection records, and timing evidence are what generally determine whether the water actually came through the sewer system or through a different source. The carrier's claim that water "backed up" can sometimes be contestable when the physical evidence shows the water came in from above.
How the clause applies to tornado and severe-storm wind claims
Tornadoes and derechos generate fact patterns where ACC application is often unwarranted. A tornado tears off part of a roof, rain pours through the opening, the basement floods from the resulting water plus heavy rain overwhelming the storm sewer. The carrier denies the entire loss citing ACC and the sewer-backup exclusion or surface-water exclusion.
The wind-driven rain coverage chain generally survives this analysis. The covered chain runs: wind → opening → rain entry → interior damage. The interior water that came through the wind-created opening was caused by wind-driven rain — a covered peril — not by sewer backup, surface water, or any other excluded category. Even if separate basement flooding occurred from a different water source, the interior damage from rain through the wind opening generally remains covered.
The December 2021 and May 2025 KY tornado outbreaks generated this fact pattern at scale. Property owners with partial-payment settlements may have additional coverage available for water damage the carrier characterized as excluded but which actually flowed from a covered wind-related cause.
How the Wittmer bad-faith analysis overlaps with ACC application
Most KY ACC denials are contract disputes. The carrier took a position on the meaning of the clause; whether the position holds up depends on the evidence and the policy language. That's ordinary breach-of-contract analysis.
Where the analysis may push toward KY's Wittmer bad-faith framework is when the carrier's ACC application is so aggressive that no reasonable reading of the clause supports it. Applying ACC to damage that physically occurred before the excluded peril arrived. Applying ACC to interior damage clearly caused by wind-driven rain. Applying the sewer-backup exclusion to water that didn't come from the sewer. Refusing to investigate the actual water source or to share inspection reports.
Under Wittmer, the three elements are: coverage existed under the policy, the carrier denied or refused to pay without a reasonable basis, and the carrier either knew there was no reasonable basis or acted with reckless disregard. Aggressive ACC application may meet the second and third elements when the clause is being stretched beyond any defensible reading. When that happens, available remedies on the right facts may include attorney's fees, consequential damages, the 12% statutory interest under KRS 304.12-235, and in some circumstances punitive damages.
See our KY bad-faith pillar for the full Wittmer framework. The specific intersection of ACC application and Wittmer analysis is where many KY mixed-peril cases that move beyond contract dispute end up.
How Property People Law approaches KY ACC disputes
When a KY property owner reaches out about an ACC-based denial, the first conversation is free and the framework is consistent. We read the specific ACC clause in your policy — language varies, and the specific words matter. We identify the underlying exclusion the clause is operating on (flood, sewer backup, gradual seepage, or another category). We map the water source on your property — where the water actually came from, when, and by what physical path.
From there we identify where the carrier's ACC application matches the actual facts and where it exceeds what the clause supports. We tell you whether what survives the denial — and whether the carrier's application of the clause may itself support a Wittmer bad-faith argument with its 12% interest, fee, and potential punitive damages framework.
Our KY residential and commercial property damage work is generally on contingency — we only get paid from the recovery, not your pocket. Past results in other cases don't guarantee outcomes in any new matter, and every claim turns on its own facts.
