Is Charleston SC Water Safe to Drink? A Transplant's Honest Read of the CCRs

We get the same call every Monday: "The water feels different."

If you moved to the Charleston area from New York, New Jersey, Pennsylvania, or Florida, you noticed something in your first shower. Maybe the water tasted different. Maybe your skin felt tighter. Maybe you Googled "is Charleston water safe" and landed on a dozen conflicting answers.

Here's the honest read, pulled from the public Consumer Confidence Reports (CCRs) and the EWG Tap Water Database. Every number below is cited and verifiable.

The Short Answer

Charleston Water System, Summerville CPW, and the other Lowcountry utilities meet current federal drinking water standards. That's what "legally safe" means. Your water passes the EPA's Maximum Contaminant Levels.

The longer answer: the EWG Tap Water Database applies stricter health-based guidelines. Under those benchmarks, CWS has 12 contaminants above EWG guidelines, and Summerville CPW has 11.

Both things are true at the same time.

Two Utilities, Two Different Water

The Lowcountry isn't one water system. Where you live determines which utility treats your tap water, and the chemistry is different.

Charleston Water System (CWS) serves peninsular Charleston, James Island, West Ashley, and parts of Mount Pleasant. Source: 90% Bushy Park Reservoir, 10% Edisto River. Disinfection: chloramine. Hardness: about 3.4 grains per gallon (moderately soft). CWS Consumer Confidence Report.

Summerville CPW serves Summerville, Nexton, Cane Bay, Carnes Crossroads, Foxbank, and most of the 29483 area. Source: Lake Moultrie via Santee Cooper. Disinfection: chlorine. Hardness: about 7.2 grains per gallon (moderately hard). Summerville CPW.

That chlorine vs. chloramine distinction matters for filtering. Chlorine strips out with a standard carbon filter. Chloramine needs a different media and longer contact time. If you're on CWS and your fridge filter isn't handling the taste, that's likely why.

What EWG Flags on Charleston Water System

The EWG profile for CWS (testing period 2013-2023) flags 12 contaminants above EWG health guidelines:

• HAA9 at 278x EWG guideline (16.7 ppb)
• HAA5 at 114x (11.4 ppb)
• Dibromoacetic acid at 58x (1.73 ppb)
• TTHMs at 56x (8.43 ppb)
• Bromodichloromethane at 47x (2.84 ppb)
• Dichloroacetic acid at 45x (8.99 ppb)
• Chromium (hexavalent) at 3.1x (0.0623 ppb)

Most of these are disinfection byproducts. They form when chloramine reacts with organic matter in the source water. They're legal under EPA limits. EWG's position is that the legal limits are too lenient based on newer research.

What EWG Flags on Summerville CPW

The EWG profile for Summerville CPW (testing period 2014-2023) flags 11 contaminants, including:

• PFUnA (a PFAS compound) at 1,183x EWG guideline (7.1 ppt)
• HAA9 at 368x (22.1 ppb)
• TTHMs at 168x (25.2 ppb)
• Bromodichloromethane at 137x (8.25 ppb)
• PFDoA at 75x (4.50 ppt)

CPW uses chlorine, which produces a different byproduct profile than CWS's chloramine.

What "Legally Safe" Actually Means

The EPA sets Maximum Contaminant Levels (MCLs) for regulated compounds. If your utility's water is below those MCLs, it's legally compliant. Period.

EWG applies their own health-based guidelines, which are typically much stricter than the EPA's MCLs. EWG's position is that the EPA's standards haven't kept up with current toxicology research. The EPA's position is that their standards are enforceable and based on a balance of health risk, treatment feasibility, and cost.

Reasonable people disagree about which benchmark to use. We point every homeowner to their utility's annual CCR and walk through what's in their specific tap during a free in-home test. You get to decide what matters to your household.

Lead Service Lines: A Tale of Two Systems

Summerville CPW completed its lead service line inventory and found zero lead pipes. If you're in Nexton, Cane Bay, or Summerville proper, your service line is not lead per the published data.

Charleston Water System tells a different story. CWS identified about 6,000 lead service lines concentrated in peninsular Charleston and the North Charleston Neck corridor. A $120 million replacement program is underway with a $32.4 million federal grant, and the EPA deadline is 2037.

If you're on CWS in an older neighborhood, it's worth checking whether your home's service line is on the lead inventory. CWS has a public lookup tool.

The March 2026 Boil-Water Advisory

On March 17-18, 2026, about 70,000 Summerville, Goose Creek, and Berkeley County residents were placed under a boil-water advisory after a contractor punctured the Santee Cooper main line at the Lake Moultrie Regional Water Plant. CWS customers and Naval Weapons Station residents were not affected.

The advisory was lifted 24 hours after the repair. But the event reminded a lot of transplants that their water supply depends on infrastructure they can't see.

FAQ: Charleston Water Safety

Is there a difference between chlorine and chloramine?

Yes. Summerville CPW uses chlorine. CWS, Mount Pleasant Waterworks, and Dorchester County Water Authority use chloramine. Chloramine doesn't strip out with the simple carbon filters that handle free chlorine. It needs a different media and longer contact time. We'll tell you which one you're on during a free water test.

Does my Brita pitcher work?

For chlorine, a standard Brita helps with taste and odor. For chloramine, a standard carbon pitcher filter has limited effectiveness. For hardness (which causes the shower and dish issues), a pitcher filter does nothing. Hardness is a whole-home conversation.

If You Want the Numbers for YOUR Tap

Book a free in-home water test. 45 minutes. We'll pull a sample from your tap, run the baseline test on your counter, and walk through what the numbers mean for your specific utility zone. No obligation, no pitch.

If your water's fine, I'll say so.

Call or text Jarred at (843) 302-5720, or book online at pristinewaternetworks.com/book.