You may see this phrase in an insurance denial, a demand letter, an incident report, or a lawyer's explanation of why a property owner may be legally responsible for an injury. It means failing to inspect, repair, service, or upkeep property or equipment with reasonable care, so a dangerous condition is allowed to develop or remain.

Negligent maintenance often comes up when something was not just accidentally unsafe, but predictably unsafe because regular attention was skipped. That can include broken stairs, loose handrails, worn flooring, bad lighting, malfunctioning gates, damaged machinery guards, or ice that was not addressed within a reasonable time. In a premises liability claim, the central question is usually whether the owner, manager, or another responsible party knew - or should have known - about the hazard and failed to fix it or warn people.

For an injury claim, this issue can affect both fault and proof. Maintenance logs, inspection records, repair requests, photos, and witness statements may help show notice, breach of duty, and causation. In Wyoming, modified comparative fault applies: under the state's 51% bar rule, an injured person who is 51% or more at fault cannot recover damages. A negligent maintenance claim also has a time limit. Wyoming generally allows 4 years to file a personal injury lawsuit from the date of the accident. If the injury happened at work, the Wyoming Department of Workforce Services may also be involved through the state workers' compensation system.