The stormwater utility allows the Village to equitably charge non-profit and tax-exempt entities for stormwater, as well as taxable entities. The system is set up to charge property owners based on the amount of impervious surface on a property. Examples of impervious surfaces found on typical residential lots include roofs, decks, driveways, patios, gravel surfaces, and sheds. The Village determines the amount a property owner pays to the stormwater utility by calculating the Equivalent Runoff Unit (ERU) of each property. Map of the stormwater ponds in Slinger, WI.
What is stormwater runoff?
Stormwater runoff is rain and melted snow that flows off of impervious surfaces such as rooftops, driveways, lawns, streets, and parking lots. This water is collected by storm sewers and ditches and is transferred into various stormwater ponds located around the Village. This water is filled with pollutants such as garbage, grease, oil, gasoline, sediment, road salt, pet waste, leaves, grass clippings, etc. Stormwater ponds receive higher volume flows and allow for stormwater to accumulate and settle out sediment and other pollutants before discharging the stormwater downstream at a slower rate.
Stormwater Measurement
| Residential Property | 1 ERU/home |
| Condo | 1 ERU/dwelling unit |
| Commercial/Industrial | Total Impervious Surface on the Property/4,300 sq. ft. ERU |
Schools, churches & mobile home parks are treated the same way commercial/industrial properties are treated.
One ERU is equal to 4,300 square feet of impervious surface. A study has determined that 4,300 sq. ft. is the average impervious surface area of the average residential parcel within the Village.
In March 2003, the federal government established a rule requiring construction sites of one acre or larger in size to acquire a permit for clearing, grading, excavating or stockpiling fill. Failure to acquire the permit may result in fines of $10,000 per day.