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Frequently Asked Questions - GIS

Where can I get a plat of survey?
A plat of survey is drawing that represents a single property that has been surveyed in the field and certified by an Illinois licensed land surveyor.

A plat of survey is usually required for a mortgage closing, refinancing, or building permit.

Most plats of surveys are held by either a property owner, a mortgage company, a government agency that issued a building permit, or the land surveyor that prepared it. Plats of survey are rarely filed with the County Recorder of Deeds.

The County sells copies of subdivision plats (in the Recorder of Deeds office) or tax assessment maps (from the County Clerk's office). Neither of these documents can be a substitute for a plat of survey.

Try the government agency that issued the building permit on the property (our Development department for unincorporated areas), their mortgage company, or as a last resort the surveyor who did the survey.

Plats of survey are like bread, they get stale after awhile. So even if the property owner can locate an old plat of survey, odds are it is obsolete and they will still have to hire a private land surveyor to create an updated survey. 
Professional Land Surveyor's - Ordinance Questions:

Where can I get a copy of the DuPage Countywide Stormwater & Floodplain Ordinance?  See the Stormwater Regulatory Services. A PDF document is available for download (See Section 15-33 on Pg.19).

Local Geoid Model - The County has defaulted to the latest Good Model that NGS uses with their OPUS solutions. Currently it is called GEOID 12A. Note: Subject to change by NGS.

Additional Ordinance questions: Please contact the DuPage County Stormwater Management Division or call 630-407-6700.

Where can I find parcel information?
You can use the Parcel Viewer interactive web mapping application to find and view parcel data / information.
Where can I find free downloadable "GIS Data" for DuPage County?
DuPage County GIS datasets are available for free download. Go to the Open Data Portal.
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