Water Quality

Charleston Water System provides clean, safe, award-winning drinking water that meets or exceeds all state and federal regulatory requirements.It is continually tested during the treatment process and throughout our water distribution system to ensure quality.

Our lab performs thousands of water analyses per month. A summary of each year's water quality testing is provided in our annual water quality report, also known as the Consumer Confidence Report (CCR). This report is published each May and posted on this page.

Partnership For Safe WaterPartnership for Safe Water logo
Charleston Water joined the Partnership in 1995, received the Directors Award in 2004, the Five Year Directors Award in 2008, and the 10 Year Directors Award in 2013.

The Partnership is a voluntary program for water utilities that commit to treating water beyond what's required by regulations. Sponsored by the US Environmental Protection Agency, the American Water Works Association, and other water organizations, the program focuses on helping surface water treatment plants optimize operations—specifically filtration. 

Some 200 utilities nationwide participate in the program, which has four phases of achievement: collection of turbidity data (a measure of the cloudiness of water), a self-assessment evaluation, and a peer review.

Area Wide Optimization Program (AWOP)
On the state level, the Department of Health and Environmental Control (SCDHEC) sponsors a program similar to the national Partnership program.

The Area Wide Optimization Program, or AWOP, and the goal is to support utilities in improving disinfection and particle removal for the benefit of public health.

Every year, DHEC recognizes water plants that go beyond the requirements of EPA regulations for drinking water. Charleston Water System was awarded this recognition in 2003 and again in 2007 for the performance of the Hanahan Water Treatment Plant.

Request A Water Quality Test
If you have a water quality concern or would like to request a water quality test, please call our Customer Service Department at 843-727-6800 or send an email.

Lead Testing
Charleston Water System reduces the corrosiveness of our water during the treatment process, which prevents lead from old plumbing from leaching into your water. However, if your home has old plumbing and/or solder, and you would like to test your water for lead, we offer testing free of charge. Just pick up a testing kit at our downtown or north area office locations. Learn more about lead and drinking water.