Grading & Drainage: Des Plaines vs Oak Park

Can my downspout drain onto my neighbor's lot?

No. Concentrated stormwater discharge directly onto an adjacent property is prohibited. Discharge to splash blocks on your own property, drywells, or storm sewer connections is appropriate.

Can I connect my sump pump to the sanitary sewer?

No. Sump pump and downspout connections to the sanitary sewer are prohibited and contribute to combined sewer overflows. They must discharge above grade or to the storm sewer.

Do I need a grading plan to replace concrete?

Minor flatwork replacement maintaining existing grades typically does not require a grading plan, but new additions or significant grading changes do require plan review by Engineering.

Do I need a grading permit in Oak Park?

A grading plan is required as part of most building permits. Significant earthwork may require a separate grading permit even without other construction. Contact the Building Division to determine if your project needs one.

Can I change the slope of my yard?

You may regrade your property, but you cannot alter drainage patterns in a way that increases stormwater flow onto neighboring properties. A grading plan showing existing and proposed drainage is typically required.

Can I connect my downspouts to the sewer?

Direct connection of downspouts to the sanitary sewer is not permitted. Downspouts should discharge onto your property's surface where water can infiltrate or be managed through approved drainage methods.