Reading Your Water Quality Report: What Nanograms per Litre Indicate for PFAS
When water quality labs report levels of PFAS—per- and polyfluoroalkyl substances—in nanograms per litre (ng/L), they express extremely small concentrations. One nanogram per litre equals one part per trillion, indicating a single drop of PFAS in a trillion drops of water. Four decimal places, such as 0.0035 µg/L (equivalent to 3.5 ng/L), provide the precision needed to identify minute traces of compounds like PFOA and PFOS, which are measured due to their persistence and bioaccumulative nature.
Distinct Technologies for Addressing PFAS: Granular Carbon Beds Versus Ion-Exchange Resins
Among treatment methods for the suite of PFAS, different equipment uses documented technologies that perform differently. Granular activated carbon (GAC) beds adsorb many PFAS compounds, trapping them on the carbon’s surface. Ion-exchange resins, by contrast, exchange ions within the water to capture specific fluorinated compounds. Each method has strengths depending on the water’s chemistry and the PFAS species present. The Autotrol PFAS Forever Chemicals Filter utilizes an engineered system that combines these principles to reduce PFAS concentrations effectively for residential water use.
Understanding Aesthetic Secondary Standards Versus Health-Based Limits in PFAS Monitoring
It’s important to distinguish aesthetic secondary standards, which relate to taste, staining, or corrosivity, from health-based limits set by regulatory authorities. Federal maximum contaminant levels (MCLs) for PFAS compounds such as PFOA and PFOS are health-based and established to protect public health. The EPA’s UCMR5 monitoring for Bartow County’s public water system shows no detected PFAS above these health-based MCLs, reinforcing that the system meets safety requirements. Some PFAS detections are above the reporting limit but remain far below MCLs and are not considered unsafe.
Clarifying Common Confusions: PFAS Compared to Other Water Quality Concerns
PFAS issues often get confused with problems like iron staining or microbial contamination, yet they differ fundamentally. PFAS are synthetic, highly stable fluorinated compounds sometimes called “forever chemicals” due to their persistence and resistance to natural breakdown. Unlike turbidity or iron, which affect water clarity and color, PFAS presence is primarily a chemical concern addressed through precise analytical methods and specialized treatment systems.
The Impact of Plumbing Materials and Age on Residential PFAS Levels
While source water sampling provides a baseline, plumbing materials and the age of a home's water system can influence the ultimate water quality at the tap. Pipes and fixtures may contribute to changes in water chemistry or interact with trace compounds, potentially affecting fluorinated compound concentrations locally. However, plumbing does not produce PFAS; it only influences distribution. Testing a specific home's water is necessary to understand individual exposure levels accurately.
Summary and Reference
The public water system serving Cartersville and the surrounding Bartow County area is sourced from surface water and serves over 70,000 people through more than 26,000 connections. EPA monitoring records from 2023 to 2026 show no PFAS compounds detected above federal maximum contaminant levels. This data covers the public system's supply broadly, not individual household plumbing. Residents seeking precise knowledge of their own water should conduct site-specific testing. For those considering treatment solutions, the Autotrol PFAS Forever Chemicals Filter offers a documented approach to reduce fluorinated compounds effectively. Detailed governmental monitoring data can be accessed via the EPA’s SDWIS public water system records.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2026-06-03. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR5 monitoring (2023-2025) for BARTOW COUNTY (GA0150001), GA: 190 results across 10 listed contaminants, 13 detections above the reporting level; compared with the applicable federal MCL, none above
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