If you want a sense of political lean, look at the voter turnout and distribution between D and R state house, senate, and governor's race in 2022. That will give you a good sense of how things are. This is Sebago - not blue. https://www.townofsebago.org/sites/g/files/vyhlif3796/f/uploads/november_8_2022_election_results.pdf

You should not test for the general "coliform" - you know that is positive. You should test for fecal coliform and e. coli. Maine Environmental Laboratory has a good description of what each of the tests mean. If you're within reasonable driving distance of Yarmouth, they also do the analyses and their price is reasonable.