Wicklow's unique landscape and climate significantly influence drain and sewer systems, requiring specific expertise from local professionals. The county experiences frequent and intense rainfall, especially in high ground areas near the Wicklow Mountains, increasing the risk of surface water and river flooding. This can overwhelm older drainage infrastructure and lead to blockages or backups in residential properties, particularly those with combined foul and surface water systems.
Furthermore, Wicklow's varied soil types, including areas with shallow bedrock, upland peat, or poorly drained clay, can severely impact the performance of septic tank percolation areas. Along the coast, coastal erosion, exacerbated by sea level rise and severe storms, can affect drainage pipes, some dating back to the 19th century in places like Bray. Homeowners might also encounter issues related to ageing pipework in older properties, including those with 'backyard water services'.