Stormwater Utility Fee

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Durham County Stormwater Utility Fee

Screen ClippingThe Durham County Stormwater and Erosion Control Division is tasked with finding ways to manage the ongoing challenge of stormwater impacts to the unincorporated areas of the County and meet state requirements (Jordan Lake and Falls Lake Rules) to reduce pollutants, especially nutrients like phosphorous and nitrogen, in our waterways.  As the County continues to grow, the need to address increasing stormwater runoff and the pollutants it carries is a necessity. Nutrient management for both existing and new development is mandated by the North Carolina Department of Environmental Quality.

In order to pay for the projects that will be needed to address nutrient loading from existing development and meet state stormwater requirements, Durham County has implemented a Stormwater Utility Fee, to go into effect in August 2020. It is a fair, equitable, and stable way for Durham County to collect revenue to help fund the activities required to meet the nutrient rules. It is estimated that it may cost Durham County more than $70 million dollars over the next 20 years to reduce pollutants in our waterways to meet the state requirements.

The Stormwater Utility Fee was derived from a formula that spreads the cost of the utility across County property owners in a way that reflects each property’s contribution to stormwater runoff.

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LIVE Q&A From July 1, 2020:


Who Will Pay the Fee?

All property owners in Durham County, OUTSIDE of City of Durham limits, who have a property with impervious surface (hard surfaces such as driveway, sidewalk, rooftop) will have the fee added to their property tax bill. All developed parcels, including residential, commercial, industrial, education and agriculture, will be charged. Properties that might be tax-exempt for other purposes (churches, schools, government properties, etc.) will also be billed the stormwater utility fee.

How Is the Fee Calculated?

The Durham County Stormwater and Erosion Control Division acquired aerial imagery of every lot in Durham County, outside of City limits, to determine the amount of impervious surface in the county. The data was analyzed and an “Equivalent Residential Unit” (ERU) was developed. An ERU represents the median square footage of impervious area found on residential properties in Durham County.

1 ERU = 4, 300 square feet of impervious surface area

Residential Properties

Residential properties will be billed using a three-tier system. Determining which tier a property fits into is based on the amount of impervious surface on the lot. The tiers were statistically developed based on the number of properties analyzed and the amount of impervious surface calculated. This is a popular method used by other cities and counties nationwide for calculating fair and equitable stormwater utility fees. Using this rate structure, the majority of average-size homes fall under the middle tier, while residential lots with a very high amount of impervious, such as a longer driveway or larger rooftop, patios, or additional structures, will fall under Tier 3, and pay a higher rate. More impervious surface has a larger impact on water quality, and therefore the rates have been structured to address this. Properties with a very small amount of impervious surface will pay the lowest rate, within Tier 1.

Agricultural Properties

Agricultural properties that have a residence on them will be charged one of the tiered residential rates. If a property does not have a single-family residence, it will be charged per ERU, based off of the exact amount of impervious surface located on the property.

Non-Residential Properties

Properties that are non-single family residential, such as commercial, institutional, or industrial, will be charged per ERU. The impervious area has been calculated, and these properties will be charged $24 per ERU, annually.

Fee Calculation

The graphic below indicates the rates for all properties. One ERU, or equivalent residential unit, will be charged $24 per year.

 Stormwater Utility Rates


NSFR Example:  20,000 sq ft of impervious = 4.65 ERUs, rounded to 5 ERUs

Property Owner Pays 5 ERUs x $24/ERU = $120 per year

How are Fees Used?

The fees will be used to pay for new stormwater control measures, retrofits to existing systems, public education, identifying land conservation opportunities and assisting landowners with implementing measures that will reduce stormwater runoff.  They will fund the compliance measures of the State's Nutrient Management Strategies and protect Durham County’s waterways.

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