Free Water Testing in
Charleston, SC
Charleston is one of America's most celebrated cities — but beneath the historic beauty, the Lowcountry faces some of the most complex water quality challenges in the Southeast. PFAS contamination from nearby military installations, lead from pre-1986 plumbing in the historic district, disinfection byproducts from treating Edisto River water, and coastal saltwater intrusion all intersect in the greater Charleston metro.
ClearFlow's trained specialists test your Charleston home's water on-site and provide a written report of your results at no cost. We serve the peninsula, West Ashley, Mount Pleasant, James Island, Summerville, and the tri-county area.
Charleston Water Quality Summary
Charleston's Water Quality: A Lowcountry Reality Check
Charleston Water System draws its source water primarily from the Edisto River and Bushy Park Reservoir — blackwater river sources that carry high loads of natural organic matter from the surrounding Lowcountry wetlands. When this water is treated with chlorine and chloramine to meet EPA standards, those organic compounds react to form disinfection byproducts including total trihalomethanes (TTHMs) and haloacetic acids (HAAs). Charleston Water System publishes its measured levels each year in its Consumer Confidence Report, and the EPA sets maximum contaminant levels for these byproducts because of health concerns associated with long-term exposure.
The PFAS situation in the Charleston area is among the most concerning in South Carolina. Joint Base Charleston — one of the largest military installations in the state — has a documented history of PFAS contamination related to aqueous film-forming foam (AFFF) used in firefighting training. PFAS compounds discharged at and around the base have migrated into groundwater and surface water in North Charleston, Goose Creek, Hanahan, and surrounding communities. These "forever chemicals" are persistent in the environment, and the EPA has set maximum contaminant levels of 4 parts per trillion for PFOA and PFOS in drinking water.
Lead contamination is a persistent and underreported issue in Charleston's historic housing stock. Homes built before 1986 — the year lead was banned from plumbing materials — frequently have lead solder at pipe joints or lead service lines connecting to the street main. Charleston's peninsula, with its dense concentration of 19th and early 20th-century homes, is particularly at risk. The CDC states that no safe blood lead level in children has been identified. The only way to know if lead is present in your drinking water is to test at the tap — it has no taste, color, or odor.
Coastal Charleston also faces saltwater intrusion — a growing problem as sea levels rise and coastal aquifers are stressed by increasing population. Well owners on James Island, Johns Island, the barrier islands, and the tidal creek communities of the Lowcountry may experience elevated sodium, chloride, and total dissolved solids in their groundwater. This makes well water unsuitable for drinking and irrigation and can accelerate corrosion in plumbing and appliances.
Charleston Water Quality Challenges
Charleston's water comes from the Edisto River and Bushy Park Reservoir. Here's what Lowcountry homeowners need to know about each specific concern.
PFAS from Military and Industrial Activity
Joint Base Charleston and industrial facilities in the North Charleston corridor have been associated with PFAS detections in local water sources. The EPA set federal maximum contaminant levels for several PFAS compounds in 2024, making this a regulatory priority. ClearFlow's panel includes PFAS screening.
Disinfection Byproducts (TTHMs & HAAs)
The Edisto River's organic load reacts with chlorine and chloramine during treatment to form TTHMs and HAAs, which the EPA regulates with maximum contaminant levels. Activated carbon filtration at the point of entry is the technology commonly used to address them throughout the home.
Lead from Historic Plumbing
A significant portion of Charleston's housing stock predates the 1986 restrictions on lead in plumbing. Lead service lines, lead solder at pipe joints, and older fixtures are all potential sources, and water chemistry influences how readily lead leaches. Testing at the tap is the only way to detect lead.
Saltwater Intrusion in Coastal Areas
Rising sea levels and heavy groundwater extraction have increased saltwater intrusion into Lowcountry aquifers, particularly on the barrier islands, tidal creek communities, and low-lying peninsula areas. Elevated sodium and chloride affect taste, corrode pipes, and can be a health concern for people with high blood pressure or heart conditions.
Hard Water Scale in New Construction
Growth in Summerville, Goose Creek, and the I-26 corridor has brought many new homes with tankless water heaters and high-efficiency appliances, and manufacturers of these units commonly publish water hardness guidance and descaling requirements. A water softener addresses the minerals that form scale.
Industrial Runoff in North Charleston
The North Charleston industrial corridor — one of SC's most active port and manufacturing zones — introduces VOCs, heavy metals, and petroleum byproducts into stormwater and shallow groundwater. Well owners within proximity should test for VOCs and heavy metals annually, particularly in areas adjacent to former industrial land uses.
What ClearFlow Tests For in Charleston
Our Lowcountry panel is built around Charleston's specific concerns — PFAS screening, lead testing at the tap, disinfection byproduct evaluation, and coastal saltwater indicators for well water. Results on-site during the visit, with a written report included.
Why Charleston Homeowners Choose ClearFlow
ClearFlow's Charleston specialists understand the Lowcountry's unique water challenges in a way that national chains simply don't. We know which neighborhoods have higher PFAS risk, which areas near the military base show elevated contamination, and which historic districts are most likely to have lead service lines.
We serve Charleston-area families from the downtown peninsula to Mount Pleasant, Summerville, and the barrier islands, helping them understand what's in their water and what their options are. PFAS screening is a standard part of our panel in the greater Charleston metro.
Book your free in-home test today — no obligation to purchase.
Areas We Serve Near Charleston
Charleston SC Water Testing — FAQ
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