South Carolina's Tap Water: A Surprising Story of Quality
In a recent nationwide assessment of tap water quality, South Carolina's drinking water has emerged as a surprising success story. This independent report, which analyzed water systems serving nearly 676,000 residents across the state, revealed some intriguing insights.
The PurityMap Report
PurityMap, an advocacy website known for its data-driven approach, assigned South Carolina an average score of 82, a solid B, which is notably above the national average of 77.9. The report focused on seven major cities: Charleston, Columbia, North Charleston, Mount Pleasant, Rock Hill, Greenville, and Spartanburg, all of which scored similarly, indicating a consistent level of water quality across the state.
Water Hardness and Chloramines
One of the key findings was the water's hardness, which refers to the mineral content, primarily calcium and magnesium. South Carolina's water was classified as soft to moderate, which is generally considered desirable. This means the water is less likely to cause issues with plumbing and appliances, and it also has a more pleasant taste.
The report also highlighted the presence of chloramines in all seven cities. Chloramines are a common disinfectant used in drinking water treatment, providing long-lasting protection as the water travels through pipes. While they are generally safe, some people may prefer to filter out the taste and odor of chlorine and chloramines, which is where carbon filters come into play.
PFAS and Lead Levels
A significant aspect of the report was the absence of PFAS, or "forever chemicals", above advisory levels in any of the water systems. PFAS are a group of man-made chemicals that have been linked to various health issues, so their absence is a positive indicator. Additionally, lead levels were found to be well below the recommended 5 ppb, with an average of 2.1 ppb. However, the report cautions that older plumbing in individual homes may still pose a risk, highlighting the importance of regular maintenance and updates.
Meeting EPA Standards, But...
While all the South Carolina systems studied met the EPA's federal drinking water standards as of 2026, the report emphasizes that these standards set legal limits rather than health goals. This means that while the water is legally safe to drink, it may still contain contaminants at levels that could pose long-term health risks, according to independent health organizations.
Personal Perspective
As an analyst, I find it fascinating how a state's water quality can vary so much from the national average. It's a reminder that local conditions and treatment methods can have a significant impact. The report's focus on hardness, chloramines, and potential contaminants like PFAS and lead provides a comprehensive picture of water quality. It also underscores the importance of regular water quality testing and the role of independent advocacy groups in keeping the public informed.
In my opinion, this report should serve as a wake-up call for other states to prioritize water quality and transparency. South Carolina's relatively high score is a testament to the effectiveness of its water treatment and monitoring systems, and other states could learn from their example. It's a complex issue, but one that is crucial for public health and well-being.
