What You Need to Know About Charleston's Water Quality

Charleston's water comes from the Edisto River and underground aquifers, treated by the Charleston Water System

The Charleston Water System serves about 75,000 customers across Charleston and surrounding areas. The utility draws water from two sources: surface water from the Edisto River and groundwater from the Coastal Plain aquifer. Both sources are treated at facilities designed to meet federal and state drinking water standards before the water reaches your tap.

The city publishes an annual water quality report—called a Consumer Confidence Report—that details what contaminants were tested for, what was found, and whether levels stayed within legal limits. You can request this report from the Charleston Water System directly or find it on their website. The report covers the previous calendar year and is typically available by July.

Key Takeaways

• Charleston's water is tested regularly for bacteria, chemicals, and other contaminants, and results are published in an annual Consumer Confidence Report available from the Charleston Water System.
• Hard water is common in the Charleston area due to mineral content from local aquifers, which may affect plumbing and appliances but does not make water unsafe to drink.
• The Charleston Water System maintains water pressure and quality through a network of treatment plants and distribution lines, though aging infrastructure in some neighborhoods can occasionally affect water clarity or pressure.
• If you notice discolored water, low pressure, or unusual taste or odor, contacting the Charleston Water System is the first step to determine whether the issue is in the main line or your home's plumbing.

Hardness and mineral content in Charleston water

Charleston's water is considered hard, meaning it contains elevated levels of calcium and magnesium minerals. This is typical for the Lowcountry and results from the geological makeup of the aquifers that supply groundwater to the region. Hard water does not pose a health risk, but it can leave mineral buildup on fixtures, reduce soap effectiveness, and shorten the lifespan of water heaters and dishwashers.

Many Charleston homeowners and businesses choose to install a water softener to reduce mineral content, particularly if they notice white scale on faucets, reduced water pressure in showerheads, or stiffness in laundry. A plumber can test your water hardness and recommend whether a softener makes sense for your situation. Some people use point-of-use filters on kitchen sinks instead, which is less expensive but addresses only the water you drink and cook with.

Testing and compliance with federal standards

The Charleston Water System tests water at multiple points—at treatment plants, in distribution lines, and at customer taps—to ensure it meets standards set by the U.S. Environmental Protection Agency and the South Carolina Department of Health and Environmental Control. Tests cover bacteria like E. coli, chemical contaminants, and disinfection byproducts that form when chlorine is used to kill pathogens.

If any contaminant is detected above the legal limit, the utility is required to notify customers and take corrective action. Violations are rare in Charleston, but when they occur, the Consumer Confidence Report explains what happened, whether it posed a health risk, and what steps were taken to fix it. You can also contact the Charleston Water System directly if you have questions about specific test results.

Common water quality issues in older Charleston neighborhoods

Some older areas of Charleston have water mains that were installed decades ago. Over time, these pipes can corrode, crack, or accumulate sediment, which may cause temporary discoloration, low pressure, or occasional cloudiness in tap water. The Charleston Water System conducts ongoing maintenance and replacement of aging infrastructure, but the process is gradual and affects different neighborhoods on different schedules.

If you live in an older part of the city and notice brown or cloudy water, it is often a sign of sediment stirred up in the main line rather than a contamination problem. Running cold water for a few minutes usually clears it. If the issue persists or you notice it frequently, contact the Charleston Water System to report it; they track these complaints to prioritize pipe replacement in affected areas.

Lead and copper in Charleston homes

Lead can enter drinking water through old plumbing materials—particularly lead solder used to join copper pipes and brass fittings that contain lead. Homes built before 1986 are more likely to have these materials. The Charleston Water System tests for lead and copper at customer taps and publishes results in the Consumer Confidence Report. If levels exceed the action level, the utility works with affected customers and may recommend flushing lines or installing filters.

If your home was built before 1986 or you are concerned about lead, you can have your water tested by a certified lab. A plumber can also inspect your plumbing to identify lead solder or brass fittings. Simple steps like flushing the line before drinking water in the morning and using cold water for cooking can reduce exposure while you decide on longer-term solutions.

What to do if you notice a water quality problem

Contact the Charleston Water System if you notice discolored water, unusual taste or odor, low pressure, or cloudiness. Have details ready: when you first noticed it, which fixtures are affected, and whether the problem is constant or intermittent. The utility can check the main line and tell you whether the issue is on their side or in your home's plumbing.

If the problem is in your home's plumbing, a licensed plumber can diagnose the cause—corroded pipes, sediment buildup, a failing water heater, or a problem with your pressure regulator. If the problem is in the main line, the Charleston Water System will handle repairs. Either way, reporting it helps the utility track patterns and prioritize maintenance.

Frequently Asked Questions

Where can I get a copy of Charleston's water quality report?

Contact the Charleston Water System directly by phone or visit their website to request the Consumer Confidence Report for the previous year. The report is also sometimes available at public libraries and city offices. It covers all contaminants tested, results, and whether any violations occurred.

Is Charleston tap water safe to drink?

Yes, Charleston's tap water meets federal and state drinking water standards. The Charleston Water System tests regularly for bacteria and chemicals. If you prefer filtered water, a pitcher filter or faucet-mounted filter can reduce chlorine taste and odor, though it is not necessary for safety.

Why is my water cloudy or discolored?

Cloudiness is often air bubbles or sediment from the main line and usually clears within minutes. Discoloration—brown or yellow water—often indicates sediment stirred up during main line work or from corroded pipes. Run cold water for several minutes; if it persists, contact the Charleston Water System to report it.

Do I need a water softener in Charleston?

Charleston's hard water does not make it unsafe, but a softener can reduce mineral buildup on fixtures and extend appliance life. Whether you need one depends on your tolerance for scale and your water usage. A plumber can test your water hardness and help you decide.

Should I be concerned about lead in my Charleston home's water?

Homes built before 1986 are more likely to have lead solder or brass fittings. The Charleston Water System tests for lead and publishes results in the Consumer Confidence Report. If you are concerned, have your water tested by a certified lab or ask a plumber to inspect your plumbing for lead materials.