The City of Biggs operates a sanitary sewer collection system drawing all wastewater from the city through a subterranean network of pipes and lift stations. These wastes are treated at the City's wastewater treatment plant, located on approximately 5 acres located south west of town, in a system of ponds with bacteriological decomposition. The treatment plant was upgraded in 2000 and 2016 and is planned for additional upgrades in 2019 and 2020.
The collection system consists of mostly 6 and 8 inch diameter piping and transports sewage to one of three lift stations. With the treatment plant upgrade in 2000, approximately 7500 lineal feet of collection and transport main were also upgraded, however the city still experiences significant I&I (infiltration of stormwater from the ground into the sewer pipes) during the wintertime.