Tap and Impact Fees

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

For more information about these fees and water/sewer service for new development, please see the new development page.

Notice: Impact fees increased on July 1, 2013.
Public Notice | Fee Schedule

About Impact Fees

Impact fees help fund expansion of water and sewer infrastructure to accommodate growth.

Water impact fees are based on the meter size and 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.

For information about how these fees are calculated, please download our Development Information Guide, which is available on our new development page.

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.

About 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.

About the 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 and Impact Fee Schedule*

For new water and sewer connections
Effective July 1, 2013


Tap Size Tap Fee Impact Fee Total
3/4 inch $500 $2,590 $3,090
1 inch $1,200 $4,050 $5,250
1 1/2 inch $2,000 $7,380 $9,380
2 inch $2,200 $11,600 $13,800
3 inch $8,000 $21,400 $29,400
4 inch $14,000 $35,300 $49,300
6 inch $16,000 $44,800 $60,800
8 inch $20,000 $69,900 $89,900
10 inch $28,000 $83,200 $111,200
12 inch $34,000 $101,600 $135,600


Tap Size Tap Fee Impact Fee
Per Equivalent Residential Unit (ERU)
6 inches or smaller $200 $2,940
8 inches $700 $2,940

Sewer Change-in-Use 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.
©2013 Charleston Water System