The City of Eugene has separate stormwater and wastewater systems. When rain and runoff (stormwater) end up in the wastewater pipes, it can:
1) overload the wastewater treatment plant, requiring a release of untreated overflow into local rivers
2) take up capacity in the sewer pipes and end up at the wastewater treatment plant where it must be treated like sewage, resulting in higher treatment costs
3) require expansion of the wastewater treatment plant and collection system to handle more flow, which costs more money and affects your bill
For more details, take a look at our fact sheet.
Inflow and Infiltration Fact Sheet