Scotland a territorial parish structure, with every community in Scotland having a local congregation. Scotland also has a significant Roman Catholic population, 19% professing that faith, particularly in Greater Glasgow and the north-west. After the Reformation, Roman Catholicism in Scotland continued in the Highlands and some western islands like Uist and Barra, and it was strengthened during the 19th century by immigration from Ireland. Other Christian denominations in Scotland include the Free Church of Scotland, and various other Presbyterian offshoots. Scotland's third largest church is the Scottish Episcopal Church. Islam is the largest non-Christian religion (estimated at around 75,000, which is
Water supply and sanitation in Scotland Water Authority, the West of Scotland Water Authority, and the East of Scotland Water Authority, to prepare them for privatisation. In 1994, the Strathclyde water referendum, an unofficial referendum organised by Strathclyde Regional Council, the largest of the regional councils by population, was held, in which voters voted overwhelmingly against the privatisation proposals. There was also a more general "Save Scotland’s Water" campaign, and in the face of public opposition, the water industry in Scotland remained in the public sector. In 2002 the Scottish Parliament passed the Water Industry (Scotland) Act 2002 merging the three providers into a single one,