Charlotte-Mecklenburg Storm Water Services

​Data & Apps

Open Mapping

The Open Mapping app provides GIS Data from various databases for personal use. Users can search, locate, and download the County's GIS published data layers to be used with other software tools such as ArcGIS Software, QGIS, or AutoCad.
Open Charlotte

Charlotte’s Open Data Portal allows users to view data and information in tables and maps, download data for research and analysis and connect to machine-readable data services for data-driven applications.

The Mecklenburg County FTP service (hosted by Exavault) provides access to download many files related to FEMA Flood Insurance Studies, including H&H models, FIRM maps, non-regulatory raster products, reports, GIS data and more.

  The 3D Floodzone viewer displays current flood map data from FEMA Flood Insurance Studies, helping to indicate whether flood regulations apply, if insurance is required or advisable, and provides information about actions that reduce the risks to property and life posed by flooding.​


Polaris 3G is Mecklenburg County's real estate mapping tool that features property info, assessed values, sales, and a lot more GIS layers, including Storm Water information such as floodplains and water quality buffers.

This viewer allows residents to view proposed and pending flood map changes associated with FEMA Flood Insurance Studies to assess the impacts to their property from a Regulatory and insurance standpoint.

FINS is a partnership involving the City of Charlotte, Mecklenburg County and the US Geological Survey. FINS Live continually monitors Real-Time Rain and Stream Gage Levels along creeks throughout Mecklenburg County, NC. Emergency responders are notified when there is a potential or actual problem.


 ​This a​pp includes the locations of and information about Capital Improvement Projects such as Storm Drainage Improvements, Stream and Wetland Restorations, and Pollution Control measures that are funded, designed and managed by Charlotte-Mecklenburg Storm Water Services. 
Storm Drain Marking Map

The Storm Drain Marking map indicates areas where markers have already been placed in the past, which helps volunteers determine where to go and place new markers.

The Adopt-A-Stream Interactive Map helps prospective volunteer groups identify stream segments that are available for adoption.

The Continuous Monitoring and Alert Notification Network (CMANN) is a network of automated monitoring sites throughout Mecklenburg County that continuously collect water quality data, providing alerts and helping to evaluate pollution trends in streams.

Charlotte Explorer

Charlotte Explorer is a common view application for City of Charlotte's spatial data warehouse and some of the operational data from business systems, including Storm Water data.​

Quality of Life Explorer​​

With the Quality of Life Explorer, residents can learn more about neighborhood character, economics, education, engagement, environment, health, housing, safety and transportation.

The GeoPortal allows residents to learn more about the characteristics of properties in Mecklenburg County and what government services are provided and/or available nearby.
Stream Use Support Index

The Stream Use Support Index (SUSI) represents the most important pollutants and indicators of surface water quality including: Bacteriological, Metals, Nutrients, Physical and Biological​.​​





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Water Supply Watersheds Boundaries

Water Quality

Watersheds in western Mecklenburg County, NC that are protected due to being adjacent to Charlotte Water's drinking water source, the Catawba River. These boundaries also indicate that special development restrictions apply within these areas.

Watershed Boundaries

Miscellaneous Stormwater

This dataset indicates the boundaries of watersheds Mecklenburg County, NC, which identify the creeks and streams that stormwater will flow into after a precipitation event.

Water Quality Buffers

Water Quality

The dataset contains polygons representing riparian buffers along stream banks in Mecklenburg County, NC as well as indicating some piped streams where buffers are not required. The buffer types are determined by different ordinances and statues required at the local, state and Federal levels. Buffer types include: Post Construction Buffers; Surface Water Infrastructure Management (SWIM) buffers; Water Supply Watershed Buffers (WSW); and Wildlife Buffers.

Post Construction Districts

Water Quality

Plan review ensures that sufficient post-construction structural controls will be implemented to protect water quality and mitigate the impacts of development on stream flows after construction is complete. The Water Quality Buffers dataset includes construction buffers identified for each creek or stream.


Miscellaneous Stormwater

This data represents the potential wetlands located within Mecklenburg County, North Carolina. A wetland is a land area that is saturated with water, either permanently or seasonally, that supports vegetation of aquatic plants adapted to the unique hydric soil.

Creeks and Streams

Miscellaneous Stormwater

Creeks and streams in Mecklenburg County.

Lakes and Ponds

Miscellaneous Stormwater

The dataset displays waterbodies along the Catawba River Basin from Lake Hickory thru Lake Norman, Mountain Island Lake, and Lake Wylie to Fishing Creek Lake at Great Falls, SC. This dataset also includes Pond water features within Mecklenburg County, NC. The dataset was created to provide users a coverage for display of the Catawba River as a shaded polygon on maps.

FEMA Floodplain


A layer depicting the horizontal extent of the 1% annual chance flood event in Mecklenburg County, NC, based upon existing land use conditions. This floodplain serves as a basis of regulatory and planning activities at the local level and is utilized by the National Flood Insurance Program to determine insurance rates for affected properties.

Community Floodplain


A layer depicting the horizontal extent of the 1% annual chance flood event in Mecklenburg County, NC, based upon future land use conditions. This floodplain serves as a basis of regulatory and planning activities at the local level.

FEMA Floodway


Dataset contains polygons that represent the FEMA Floodway, an area that must be reserved in order to discharge of the 100 year flood without cumulatively increasing the water surface elevation more than 0.1 feet. No fill or construction is permitted in this area.

Community Encroachment Area


An area of the floodplain that must be kept clear of any obstruction (fill dirt, buildings, etc) as to not impede the flow of water. Development in this area is very restrictive, and usually requires a detailed engineering analysis (and local approval) prior to beginning development.

Cross Sections


A line on a floodplain map indicating the discharges and water surface elevations that have been calculated for that section of the stream and floodplain.

Floodplain Models


Floodplain model hydrologic and hydraulic (H&H) output file sets and GIS input files for Effective, Preliminary and Draft floodplain determinations in Mecklenburg County, NC, produced in accordance with FEMA Flood Insurance Studies (FIS) guidelines and specifications. Model filesets are packaged for immediate download and can be used with Hydrologic Engineering Center (HEC) software, such as the River Analysis System (HEC-RAS), Hydrologic Modeling System (HEC-HMS) and HEC-1.

Floodplain Mapping


Filesets from Effective, Preliminary and Draft floodplain determinations for Mecklenburg County, NC, produced in accordance with guidelines and specifications for FEMA Flood Insurance Studies (FIS). File types such as PDFs of FIRM maps, FIS reports and LOMR documents as well as a multitude of GIS and CAD files related to Regulatory and non-Regulatory floodplain mapping are available for immediate download.

Storm Water Easements

Miscellaneous Stormwater

An easement is a right of use by one party over the property of another party, sometimes for a specific purpose. For Storm Water, easements are property interests which document the conditions under which Storm Water has permission to enter an easement area on private property to repair drainage issues and/or perform on-going maintenance. A storm drainage easement is a recorded, legal document which describes easement boundaries and any conditions and restrictions related to the permission granted by the property.

Storm Water Inventory Pipes

Stormwater Channel Inventory

Storm Water inventoried pipes in Mecklenburg County, NC.

Storm Water Inventory Structures

Stormwater Channel Inventory

Inventoried structures in Mecklenburg County.

Storm Water Assumed Connectivity

Stormwater Channel Inventory

This service is for Storm Water assumed connectivity features to connect existing inventory.

Storm Water Inventory Open Drainage

Stormwater Channel Inventory

Storm Water inventoried channels in Mecklenburg County.

Protected Watershed Overlay

Water Quality

This is a planning feature and used for regulatory purposes. Stormwater and creeks flow directly into lakes that supply drinking water; by state law, those watersheds are under additional zoning and development regulations.