Pro Rata Share Rate and Credit Proportional Maximum Percentages

The county's pro rata share program for off-site drainage improvements involves assessing development for a proportionate share of the cost of off-site drainage improvements. It provides the county a funding source for the portion of the cost of drainage improvements necessitated by the increased runoff from development.

The following countywide rate and credit proportional maximum percentages for assessment purposes are effective July 1, 2015, through June 30, 2016.

  • Pro Rata Share Assessment Rate: $19,242 per increase in impervious acre
  • Water Quality Credit Proportional Maximum: 41.9%
  • Water Quantity Credit Proportional Maximum: 58.1%

The assessment rate and credit proportional maximum percentages are subject to annual updates each fiscal year.

For more information, see the New Stormwater Pro Rata Share Requirements Take Effect July 1, 2015 Notice or contact Land Development Services' Bonds and Agreements Center at 703-222-0801, TTY 711.


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