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The following basic requirements govern the discharge of water from residential sump pumps:
- Discharges cannot create a public nuisance (ice build-up on streets, hazardous conditions on streets or sidewalks, etc.).
- Discharges cannot be discharged to a sanitary sewer or to a floor drain.
The volume of water that accumulates in sump pits varies significantly from house to house and across the city. Most sump pumps discharge occasionally and more frequently during wet weather, however, in some situations sump pumps discharge on a regular basis regardless of the weather conditions. Pumps that discharge on a more frequent basis can cause a variety of problems.
In locations with frequent discharges they can create a public nuisance where the water flows across public sidewalks, drives, and streets in-route to the storm sewer or other approved discharge point. Where these discharges result in the growth of algae or mold on sidewalks or streets they create slip hazards to pedestrians and bicycles. In cold and freezing weather the discharges can freeze causing ice accumulation creating additional hazards for pedestrians and vehicles.
When the accumulation of ice or algae creates hazards to the public that are not readily dissipated from the normal weather changes they are considered public nuisances and must be abated within a reasonable period of time.
Suggested possible solutions for controlling sump pump discharge nuisances
Direct the discharge to the back yard where it can harmlessly dissipate or soak into the ground. When the back yard has enough slope to provide a drainage swale at the rear of the lot, the sump pump discharge may be extended toward the rear of the lot. The drainage will flow along the drainage swales and dissipate before draining into the street.
Connection to the public storm sewer system
When the discharges from sump pumps occur on the same side of the street as the public storm sewer, the property owner (or group of property owners) may extend the sump pump discharge pipes directly into the adjacent drain tile, storm sewer pipe, or nearby intake. When connecting to the public storm sewer system, the City of Iowa City Engineering Division must be contacted first for proper approval and permitting. The City of Iowa City also offers a drain tile program which may be able to provide a connection point in your area for such sump pump discharge.
Rain gardens/bio-retention cells
Rain gardens are small depressed garden areas filled with moisture loving plants. Sump pump discharge is directed to these areas to facilitate infiltration. Information to help you size your rain garden and select plant material is available through the City’s stormwater management website or by contacting the Engineering Division at 319-356-5140.
Request for City assistance
If you would like more information regarding any of these possible solutions and would like suggestions or advice from the City of Iowa City for resolving discharge problems, contact the Engineering Division at 319-356-5140.