PFAS dans les eaux usées industrielles : surveiller une menace invisible (en anglais)

PFAS are a large group of synthetic chemicals widely used for their resistance to heat, water and oil. They contain chains of carbon and fluorine locked together. The bond between these two elements is one of the strongest in organic chemistry, giving PFAS their exceptional stability and resistance to heat, chemical reactions and biological degradation.

Commonly found in products such as non-stick cookware, waterproof fabrics and firefighting foams, PFAS have exceptional longevity, persisting in the environment without breaking down.

Why PFAS Are Receiving Increased Attention

Once discharged into aquatic environments, PFAS can accumulate in fish and other wildlife before moving up the food chain. Numerous studies have linked PFAS exposure to potential health impacts including certain cancers, reduced immune response, fertility issues, thyroid disease and developmental effects in children. Given the thousands of PFAS compounds currently in use, researchers continue to investigate their long-term environmental and human health effects.

As scientific understanding of PFAS exposure and its potential human and ecological health impacts continues to grow, regulators are responding with heightened scrutiny and rapidly evolving legislation. Across many regions, discharge limits are tightening, monitoring expectations are increasing and reporting requirements are becoming more explicit.

For operators of industrial wastewater facilities—particularly in sectors with significant PFAS use, such as chemical manufacturing, textiles, food packaging and metal finishing—this growing regulatory pressure creates a clear need for early visibility and proactive management.

Understanding where PFAS may enter wastewater streams, establishing robust monitoring strategies and reducing discharges are becoming critical steps for maintaining compliance, protecting the environment and supporting long-term business continuity.

Why Are PFAS Difficult to Remove?

Conventional wastewater treatment processes—including biological degradation, sedimentation and filtration—cannot effectively remove PFAS because these compounds resist biological breakdown and remain dissolved in water. As a result, PFAS often pass through treatment systems largely unchanged, since conventional treatment processes were designed to remove traditional pollutants rather than persistent fluorinated compounds.

Emerging technologies show promise in addressing this challenge. Treatment approaches such as activated carbon adsorption, ion exchange resins, reverse osmosis and destructive technologies including plasma treatment and electrochemical oxidation are among the methods being evaluated to capture, concentrate or destroy PFAS, depending on the treatment technology used.

How PFAS Enter Industrial Wastewater Systems

PFAS are widely used throughout manufacturing and industrial processing. They commonly serve as processing aids, surfactants, coatings and stain- or water-resistant treatments, making them prevalent across a wide range of industrial applications. Industries including textiles, automotive, chemical manufacturing, electronics, metal plating and food packaging rely on these properties in a variety of manufacturing processes.

During production, formulation and equipment cleaning, residual PFAS can be washed from surfaces and discharged into wastewater systems.

PFAS-based coatings applied for stain or water resistance may also leach during rinsing and finishing operations.

Additionally, contaminated raw materials and recycling processes can introduce PFAS into wastewater when treated materials containing trace PFAS are reused or cleaned.

Preparing for Changing Regulations

Governments and regulatory agencies worldwide are tightening PFAS regulations by introducing stricter discharge limits, expanded monitoring requirements and additional reporting obligations.

In the United States, many states already include PFAS limits within industrial discharge permits, while the Environmental Protection Agency (EPA) continues developing effluent limitation guidelines for industries including chemical manufacturing, metal finishing, textiles and paper production.

Within the European Union, the Urban Wastewater Treatment Directive is expected to require PFAS monitoring in treated wastewater, with analytical standards anticipated in 2027.

Facilities generating industrial wastewater are increasingly preparing now by identifying potential PFAS sources, implementing monitoring strategies and evaluating options for reducing future discharges. An effective monitoring strategy begins with understanding the limitations of PFAS measurement and selecting complementary technologies that provide continuous operational visibility.

Why Measuring PFAS Is Difficult

Monitoring PFAS in industrial wastewater presents several challenges. More than 5,000 PFAS compounds exist, yet standard laboratory methods analyze only a relatively small subset. Consequently, a significant portion of PFAS present within a sample may remain unidentified. No single laboratory method can detect every PFAS compound, making comprehensive PFAS characterization inherently challenging.

Laboratory analysis also requires highly sensitive instrumentation, such as liquid chromatography coupled with mass spectrometry (LC-MS/MS), capable of detecting PFAS at parts-per-trillion concentrations. These analytical methods require specialized expertise and are often costly to perform routinely.

Industrial wastewater further complicates analysis because oils, metals and organic matter may interfere with measurements. Even sampling equipment and laboratory materials can introduce PFAS contamination, increasing the risk of false positives.

These analytical challenges also explain why PFAS cannot currently be monitored continuously using conventional online sensors. Instead, continuous flow and water quality monitoring complement laboratory testing by providing operational context, identifying changing process conditions and supporting targeted sampling strategies.

Supporting Water Quality Parameters

Although PFAS require laboratory analysis for direct measurement, continuous monitoring of complementary water quality parameters can provide valuable operational context and help identify process changes that warrant further investigation.

This section summarizes the complementary monitoring parameters that support PFAS monitoring strategies. While PFAS require laboratory analysis for direct measurement, continuous monitoring of flow, total organic carbon (TOC), chemical oxygen demand (COD), conductivity, pH, temperature, total suspended solids (TSS) and turbidity provides operational context, supports targeted PFAS sampling and helps evaluate wastewater treatment performance.

Together, these complementary measurements provide the operational context needed to support PFAS sampling strategies, evaluate treatment performance and improve process visibility.

Building an Effective Monitoring Strategy

Effective PFAS monitoring combines targeted laboratory analysis with continuous operational monitoring. Facilities should first identify likely PFAS sources throughout their operations before establishing sampling locations at raw influent, process streams and final effluent.

Laboratory testing quantifies targeted PFAS compounds, including perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS). Continuous flow and water quality monitoring complement laboratory analysis by providing operational context, helping operators understand process variability, prioritize sampling locations and identify changing conditions that may warrant additional PFAS sampling.

Putting Monitoring into Practice

Badger Meter supports proactive PFAS management by complementing laboratory testing with continuous flow measurement, online water quality monitoring and integrated data visibility.

Continuous flow monitoring, using ultrasonic flow meters such as the Dynasonics^® IS-4000 Open Channel Flow Meter or electromagnetic flow meters such as the ModMAG^® product family, enables calculation of total effluent load through mass-balance tracking. This provides important operational context for evaluating treatment performance and supporting mass-loading calculations when combined with laboratory analytical results.

Continuous water quality monitoring, using multiparameter platforms such as micro::station, provides visibility into complementary water quality parameters that support PFAS sampling strategies and help identify changing process conditions that may warrant further investigation or additional PFAS sampling. Changes in parameters such as total organic carbon (TOC), chemical oxygen demand (COD), conductivity, total suspended solids (TSS) and turbidity may indicate changing wastewater characteristics that warrant further investigation.

Integrated software and data visualization solutions bring laboratory PFAS results together with continuous monitoring data, simplifying reporting, trend analysis and compliance planning while providing a more complete view of wastewater system performance.

Visibility Is the First Step Toward Control

PFAS present a long-term challenge for industrial wastewater management. As scientific understanding grows and regulations continue to evolve, facilities are under increasing pressure to understand where PFAS originate, how they behave within treatment systems and how they can best prepare for future compliance requirements.

Although laboratory analysis remains essential for directly measuring PFAS, combining targeted testing with continuous flow and water quality monitoring provides operators with greater operational awareness and supports more informed decision-making. While laboratory testing confirms the presence of PFAS, continuous monitoring helps facilities understand changing operating conditions between sampling events.

Facilities that invest early in visibility, monitoring and data-driven wastewater management will be better positioned to adapt to changing regulations, reduce risk and protect long-term operational performance. Industrial facilities need proactive monitoring strategies today to prepare for tomorrow's regulatory requirements, avoid costly future impacts and strengthen long-term operational resilience.