In recent years, Wisconsin generally has been a pro-policyholder jurisdiction when it comes to long-tail environmental coverage cases. That trend continues with a decision by a Wisconsin appellate court in a case involving coverage for environmental cleanup costs at a former manufactured gas plant site. In Superior Water, Light & Power Co. v. Certain Underwriters at Lloyd’s, London Subscribing to Policy Nos. K22700, CX2900, and CX2901, the court reversed a lower court and held that there may be coverage under historic policies if there was damage to groundwater during the policy period, notwithstanding that site operations had ceased years earlier. This is an important decision, as the same historic London Market “occurrence” definition was used in many policies issued to other policyholders by London Market Insurers during the same time frame. (A description of some of the unique aspects of the London insurance market can be found here.)