What disinfectant residual is commonly used in North Carolina drinking water systems?

Chlorine is commonly used as a disinfectant residual in North Carolina drinking water systems due to its effectiveness in eliminating pathogens and its ability to maintain a residual presence throughout the distribution system. This residual is crucial for ensuring that water remains safe as it travels from treatment facilities to consumers. Chlorine is a cost-effective option and is well-understood by water treatment operators, which contributes to its widespread use.

While chloramine, ozone, and hydrogen peroxide may also be used for disinfection purposes, each has specific applications and limitations. Chloramine is often utilized in systems seeking reduced taste and odor issues, but the predominant use in many systems remains chlorine, making it the primary choice in North Carolina. Ozone is effective but lacks a long-term residual, and hydrogen peroxide is more common in specialized applications. Thus, chlorine stands out as the standard disinfectant residual in the state's drinking water systems.