Isleton, located along the Delta in the southernmost part of Sacramento County, is a city of about roughly 800 people and is surrounded by bodies of water. And on Wednesday, city officials said wastewater ponds have spilled into those nearby waterways. Those waterways include the Mokelumne, San Joaquin, and Sacramento rivers. City Manager Chuck Bergson said Isleton has nine ponds that can hold about 60 million gallons of wastewater in total, but recent heavy rainfalls, as well as pipes damaged during the January storms, have filled up all of the ponds to the point where about 2 to 3 million gallons of wastewater have overflowed.