Harpswell, Maine, zip code 04079, currently carries a critical environmental hazard designation due to significant proximity to multiple active contamination zones. The primary concern is the Former Defense Fuel Supply Point Casco Bay, located just one mile from residential areas. The Environmental Protection Agency lists this facility as an active site containing unspecified hazardous substances. Given its active regulatory status, the site remains in ongoing phases of assessment and remediation, meaning environmental containment is not fully resolved. Three additional active sites are located within ten miles, including the Brunswick Naval Air Station and locations tied to AFFF fire-retardant releases.

While the precise chemical profiles at the Casco Bay facility remain classified as unspecified hazardous substances, legacy military fuel supply depots typically leach petroleum hydrocarbons, volatile organic compounds, and heavy metals into surrounding soil and groundwater. Chronic exposure to these legacy compounds can compromise human liver and kidney function, disrupt endocrine systems, and increase the risk of specific cancers, particularly when contaminants migrate into local drinking water aquifers. Because Harpswell relies heavily on coastal resources and localized water tables, residents should take immediate protective measures to mitigate exposure risks. First, residents should install certified reverse osmosis water filtration systems capable of removing volatile organic compounds and industrial heavy metals. Second, individuals utilizing private wells must schedule independent annual water testing through a state-certified laboratory rather than relying solely on municipal baseline data. Finally, locals should routinely consult regional EPA advisories regarding safe consumption limits for seafood harvested near the Casco Bay area.