How does apartment insurance handle water damage claims?

Water damage is the most frequent and costly category of apartment building insurance claims. The ISO Special Form (CP 10 30) covers water damage from sudden and accidental causes, including burst pipes, failed water heaters, accidental discharge from fire sprinkler systems, and overflow from appliances such as washing machines and dishwashers. These losses are covered under the standard commercial property policy subject to the applicable deductible.

However, several water-related perils are excluded or limited. Gradual or repeated seepage or leakage over a period of 14 days or more is excluded under ISO CP 10 30 Section B.2.d. Water that backs up through sewers and drains is excluded unless the sewer backup endorsement is added. Flood damage from external water sources is excluded and requires a separate flood policy. Water damage below ground level (basement flooding from groundwater) may be excluded or sub-limited depending on the policy form.

Prevention is critical for managing water damage frequency. The Insurance Institute for Business and Home Safety (IBHS) recommends water leak detection systems with automatic shut-off valves, which some insurers reward with premium credits. Regular inspection of washing machine hoses, water heater connections, HVAC condensate lines, and roof drainage systems reduces the likelihood of claims. For apartment buildings with a history of water damage claims, insurers may impose a water damage sub-limit or a separate, higher water damage deductible at renewal. Loss runs showing a pattern of water damage claims can significantly impair the property's insurability and premium positioning.