Tap & Impact Fees

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

Notice of Impact Fee Increases

On December 16, 2015, Charleston Water System's Board of Commissioners
 approved a three-phased incremental increase to water and sewer impact fees,
 with the first increase taking effect July 1, 2016, the second on July 1, 2017, and
the third on July 1, 2018. See fee tables below for details. Tap fees are not
affected by this increase.

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. See changes to UCL guidelines effective January 1, 2016. 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*

Tap Size
Tap Fee
Impact 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*

Sewer impact fees are calculated per Equivalent Residential Unit (ERU).

Tap Size
Tap Fee
Impact Fee (per ERU)
Impact Fee
Effective 7/1/2018 
6 inches or smaller
8 Inches

Sewer Change-In-Use Fee* 

Tap Size
Current Fee 


  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.