The Ontario Lake Partner Program (LPP) provides total phosphorus, chloride and calcium concentration data (as well as water clarity, when available) for hundreds of Ontario's inland lakes. The data are collected annually through volunteer monitoring efforts, known as community science. Engaging volunteers to take measurements and collect samples expands the geographic area monitored and fosters public interest in Ontario’s water quality and promotes lake stewardship. The Federation of Ontario Cottagers’ Associations (FOCA) has worked in partnership with the Ministry of the Environment, Conservation and Parks to collect this information.