 In 2017 the average loan interest rate was 1.4%, compared to the prevailing market rate of 3.5%.While wastewater treatment projects have comprised 96 percent of all CWSRF funding to date, over $4.6 billion has gone to nonpoint source and estuary projects.The number of assistance agreements for nonpoint source projects has grown significantly over the years, from only two projects in 1990 to 1,305 in 2007.