From The Durango Herald:
In a statement, Town Manager Chris La May said he understands the impact of the increase on business and residential customers, but the revenue is needed to comply with Clean Water Act requirements. The town built a new wastewater treatment plant but faces more challenges to comply with health regulations. Groundwater infiltration from irrigation ditches and rising groundwater plagues the sewage collection system, La May said. The infiltration pushes the capacity of the treatment plant toward its limit and flushes bacteria used to break down fecal matter through the plant more rapidly.
More wastewater coverage here.