Water Quality Protection Charges With Impervious Surface Data

This dataset details Montgomery County's Water Quality Protection Charge (WQPC), a property tax levy based on impervious surface area. It includes specific square footage calculations for building, parking, and recreation impervious surfaces per property account. The data is published by Montgomery County and updated annually.

Use Cases

• Calculating stormwater runoff fees for individual properties using 'Total Impervious sq-ft' and 'Property Type'.
• Analyzing land use patterns by comparing 'Building Impervious sq-ft' and 'Parking Impervious sq-ft' across different 'Council Districts 7'.
• Mapping property-level impervious surface contributions to watersheds using 'Location1 (address)' and geospatial coordinates.
• Assessing the distribution of WQPC revenue across 'Municipalities' and 'Communities' for program funding equity.

Strengths

• Contains detailed, property-level breakdowns of impervious surface area by type (building, parking, recreation).
• Includes geographic identifiers such as zip codes, council districts, municipalities, and address data for spatial analysis.
• Dataset is hosted on multiple government platforms (Socrata, Data.gov), indicating official status and reliability.

Limitations

• Key metadata such as total row count, data license, and exact temporal coverage are unavailable or conflicting across sources.
• The 'last updated' dates provided (2026-04-05, 2026-04-01) are in the future, casting doubt on the accuracy of this metadata.

Provenance

Source

data.montgomerycountymd.gov

Collection Method

Collected as part of property tax assessment and WQPC calculation processes.

Freshness

Reported as updated annually, with the most recent platform date listed as 2026-04-05.

Geography

Montgomery County, Maryland, USA.