Impact, Tap & Change-in-Use Fees

Below are Charleston Water System's tap and impact fees, which apply to new connections to our water and sewer systems.

Impact Fees
Impact fees help fund expansion of water and sewer infrastructure to accommodate growth. Water impact fees are based on the tap size. Sewer impact fees are calculated using Equivalent Residential Units (ERUs) for residential customers and Unit Contributory Loadings (UCLs) for commercial properties. Charleston Water System does not charge impact fees for dedicated fire service lines.

Sewer Change-in-Use Fee
Businesses opening a new sewer account at an existing location may be subject to a one-time, non-refundable change-in-use fee to fund infrastructure costs associated with higher wastewater flows generated by the change in use of an existing facility or construction of a new facility.

Tap Fees
Water tap fees cover the cost of installing a water meter and are based on meter size. The sewer tap fee is charged to cover the cost of inspecting sewer connections made by contractors. Dedicated fire service lines are not charged a tap fee.

Affordable Housing Rate
Reduced impact fees for affordable housing are available to qualified applicants. The affordable housing rate waives the $500 engineering services charge included in the water and sewer impact fee structure, allowing a total savings of $1,000 for water and sewer impact fees. To find out more about the affordable housing impact fee rate, please contact the Lowcountry Housing Trust for qualification criteria.

Water Tap & Impact Fee Schedule*
Effective July 1, 2013
Tap Size
Tap Fee
Impact Fee
3/4 Inch
1 Inch
1 1/2 Inch
2 Inch
3 Inch
4 Inch
6 Inch
8 Inch
10 Inch
12 Inch

Sewer Tap & Impact Fee Schedule*
Effective July 1, 2013
Tap Size
Tap Fee
Impact Fee (Per Equivalent Residential Unit
6 inches or smaller
8 Inches

Sewer Change-In-Use Fee
Effective July 1, 2013

  1. Dedicated fire service lines that supply fire sprinkler systems are not charged water tap and impact fees.
  2. The above fees do not include account origination fees, which are charged at the time an account is established.
  3. Engineering service fees are included in the impact fee totals.