The population of Willernie is made up of a mixture of ethnic groups. Most of the people of Willernie identify themselves as White, while a small number are of African, German, or Polish descent. Additionally, the city has a large number of residents who speak languages other than English. Those who speak languages other than English tend to be Scandinavian, with high concentrations in Swedish, German, and Irish.
The local comprehensive plan for Willernie should consider wastewater management. The plan should include conditions for both municipal and private treatment facilities. Municipal wastewater treatment plants can only handle a certain amount of wastewater per hour, so Willernie should plan the development and staging of new developments accordingly. In addition, the regional wastewater collection system must be planned and a city must use its judgment in determining its adequacy.