1. A sparse data method for determining regulatory compliance of a plurality of environmental systems, said environmental systems being serviced by service personnel, there being a regulatory body for monitoring said plurality of environmental systems, a plurality of responsible parties being responsible for one or more payments related to respective ones of said plurality of environmental systems, said regulatory body designating a threshold for an amount of wastewater to be treated within a period of time for each of said plurality of environmental systems, said environmental systems being serviced by service personnel, said method comprising: providing at least one wastewater flow sensor at each of said plurality of environmental systems; programming at least one processor for each of said plurality of environmental systems for receiving data from said at least one wastewater flow sensor and for determining when said threshold is reached; providing an electronic connection from each of said plurality of environmental systems to at least one server computer; and programming said at least one processor for reporting over said electronic connection to said at least one server computer only after said step of determining that said threshold has been reached.