16 March 2026
Water Treatment Chemicals
Why PAC Dominates Water Treatment Coagulation
PAC vs Alum: Side-by-Side Comparison
The Regulatory Framework by Region
Key Compliance Considerations for Procurement Teams
Supply Chain Geography in 2026
Frequently Asked Questions
Conclusion
January 12, 2026 was a hard compliance deadline. From that date, EU Member States were required to meet the new parametric values under Directive 2020/2184, the recast Drinking Water Directive, including mandatory PFAS monitoring limits: 0.5 micrograms per litre for PFAS Total and 0.1 micrograms per litre for Sum of PFAS. A second EU deadline falls on December 31, 2026, when harmonized standards apply to materials and chemicals used in new drinking water installations.
These deadlines sit inside a broader tightening of water treatment chemical standards across the US, China, and key Asia-Pacific markets. The result is that procurement decisions around coagulants, historically straightforward, now carry real compliance risk if the product lacks the right certification, carries incorrect origin documentation, or fails to meet the residual aluminum limits that multiple regulators have converged on.
Polyaluminium chloride (PAC) is the world's most widely used coagulant. According to Consegic Business Intelligence, the global PAC market was valued at USD 1,847 million in 2024 and is projected to reach USD 2,784 million by 2032 at a CAGR of 5.3 percent. Asia Pacific accounts for 35.75 percent of that market, with China alone representing 26.05 percent of global consumption. This article covers where PAC stands under every major regulatory framework in 2026, how it compares to its main alternative, and what the sourcing picture looks like today.
PAC's market dominance is not a coincidence. It comes from performance advantages over aluminum sulfate (alum) that become more pronounced as regulatory residual aluminum limits tighten.
Evidence supporting this includes:
The structural reason for these advantages: PAC is pre-hydrolyzed during manufacturing, meaning it already contains hydroxyl groups (Al-OH bonds) before it enters the water. Alum has zero basicity and releases Al3+ ions that must hydrolyze in situ. That in-situ hydrolysis is sensitive to pH, temperature, and raw water chemistry. PAC's pre-formed hydroxyl groups give it a broader, more stable operating range and lower post-treatment aluminum residuals under variable source water conditions.
For procurement teams evaluating which coagulant fits their regulatory and operational requirements, the key differences are as follows:
|
Parameter |
Polyaluminium Chloride (PAC) |
Aluminium Sulfate (Alum) |
|
Effective pH range |
5.0 to 9.0 |
5.8 to 8.5 |
|
Basicity |
Pre-hydrolyzed (40-85%) |
Zero (hydrolyzes in situ) |
|
Residual Al control |
Lower and more consistent |
Higher variability |
|
pH adjustment needed? |
Usually not required |
Often needed (lime/NaOH) |
|
Sludge volume |
Lower (denser flocs) |
Higher |
|
PFAS reduction (PFOS/PFOA) |
Higher at equivalent dose |
Lower at equivalent dose |
|
Optimal dose (leachate study) |
1.9 g/L |
9.4 g/L |
|
Unit price |
Higher |
Lower |
|
Total operational cost |
Often lower (fewer additives, less sludge) |
Varies by source water |
|
NSF/ANSI 60 certified grades available? |
Yes |
Yes |
|
Best for |
Strict residual Al compliance; variable source water; PFAS-affected systems |
Simple, stable source water; lowest upfront cost |
PAC costs more per unit but frequently delivers lower total operating cost when pH adjustment chemicals, sludge disposal, and residual aluminum compliance are all factored in. For utilities operating under the EU's 0.2 mg/L residual aluminum limit or the US SMCL range, PAC is the lower-risk choice.
In the US, PAC used in drinking water treatment must carry NSF/ANSI/CAN 60 certification. As confirmed by NSF International, PAC is explicitly listed among the chemicals requiring this certification for drinking water use. The certification is product-specific, not manufacturer-wide: a manufacturer may hold NSF 60 for liquid PAC but not powdered PAC, or for one concentration grade but not another.
The 2024 edition of NSF/ANSI/CAN 60 added aluminum to the metals required in the key specification disclosure footnotes, and the 2025 edition made calculation corrections without changing core requirements for PAC. Most government water agencies in North America require NSF 60 compliance as a contract condition.
On residual aluminum in finished water, the US EPA sets a Secondary Maximum Contaminant Level (SMCL) of 0.05 to 0.2 mg/L. These are non-enforceable federal guidelines for aesthetic effects, though individual states may adopt them as enforceable standards. The EPA encourages utilities to target below 0.05 mg/L where operationally feasible.
According to the EPA's 2022 Chemical Data Reporting analysis, US domestic PAC production was approximately 66 million kilograms in 2019, with India as the primary import source and Canada as the primary export destination. One supply-side factor: imports of PAC from China under HS code 2827.32 carry an additional 25 percent duty under the Section 301 tariff list. That tariff has pushed a significant share of US buyers toward domestic or India-origin supply.
The EU's recast Drinking Water Directive 2020/2184 has been binding on Member States since January 13, 2023. It permits aluminum-based coagulants including PAC in drinking water treatment, subject to a maximum residual aluminum limit of 0.2 mg/L in finished water.
Two 2026 deadlines are directly relevant to PAC procurement:
PAC also falls under REACH Regulation (EC) 1907/2006 for chemical registration and the Biocidal Products Regulation (BPR) for its function as a water treatment agent. Procurement teams sourcing PAC for EU projects should request REACH compliance documentation alongside the standard product certificate of analysis.
China updated its national drinking water quality standard with GB 5749-2022, effective April 1, 2023. The standard lists PAC as an approved coagulant with a residual aluminum limit of 0.2 mg/L in treated water. The manufacturing quality standard GB 15892-2020 governs PAC quality indicators for water treatment grade product.
For drinking water grade PAC specifically, the earlier GB/T 22627-2014 sets particularly strict limits: Al2O3 content at minimum 28 percent, basicity between 40 and 85 percent, and heavy metal limits including arsenic at maximum 0.0005 percent, lead at 0.002 percent, cadmium at 0.0005 percent, and mercury at 0.00001 percent. The Chinese arsenic limit is among the strictest globally.
China accounted for 26.05 percent of global PAC consumption in 2024 and is the world's largest producer. The distinction between industrial grade and drinking water grade product is critical for export documentation: when Chinese-origin PAC is evaluated for drinking water applications in other markets, the certificate must clearly identify which Chinese standard the product meets.
The World Health Organization's Guidelines for Drinking-water Quality, fourth edition incorporating first and second addenda (2022), does not set a formal health-based guideline value for aluminum. The JECFA Provisional Tolerable Weekly Intake would yield a value of 0.9 mg/L, but the WHO notes that practicable treatment performance is well below this.
The WHO's practical guidance sets two operational tiers: 0.1 mg/L or below for large water treatment facilities under good operating conditions; 0.2 mg/L or below for small facilities (under 10,000 population). The WHO also notes that drinking water contributes less than 5 percent of total aluminum intake for the general public, with food as the dominant source.
The 0.1 to 0.2 mg/L range functions as the global de facto compliance baseline for markets in Southeast Asia, South Asia, Africa, and Latin America that reference WHO guidance directly in their national standards. For procurement teams operating across these markets, the WHO tiers are the practical specification floor for residual aluminum performance.
Japan and South Korea permit PAC in drinking water treatment with strict residual aluminum and dosage limits, particularly for food and beverage sector applications. Australia and Singapore both permit PAC in drinking water systems subject to national quality standards. Residual aluminum limits in these markets generally fall in the 0.1 to 0.2 mg/L range, consistent with WHO and EU guidance.
Some of these markets require locally recognised laboratory testing rather than accepting certificates from the country of manufacture. Confirming destination-market certification requirements before finalising supply contracts avoids delays and rejection risk at customs.
Getting PAC procurement right across multiple regulatory jurisdictions comes down to documentation discipline. The chemistry is well understood. The compliance risk sits in the paperwork. Here is what well-run procurement operations specify and check before finalising any supply arrangement:
For US and Canadian projects, PAC must carry a current NSF/ANSI/CAN 60 certificate covering the specific grade and form being purchased. Certificates are product-specific and can lapse. Verify on NSF's live online listing rather than relying on a certificate document, which may be out of date.
The required standard varies by destination market: NSF/ANSI/CAN 60 for North America; DWD 2020/2184 compliance and REACH documentation for the EU; GB 5749-2022 / GB/T 22627-2014 for China; WHO GDWQ-aligned national standards for Southeast Asia and the Middle East. Do not assume a certificate valid in one jurisdiction satisfies requirements in another.
Specify whether the product meets industrial grade (GB 15892-2020) or drinking water grade (GB/T 22627-2014) requirements. The price difference between these grades reflects real differences in heavy metal control, particularly arsenic. Industrial grade product is not suitable for drinking water treatment applications.
Product specification sheets state theoretical or typical values. A batch certificate of analysis provides actual test results for the specific lot being purchased. For drinking water applications, the certificate should include Al2O3 content, basicity, moisture or water-insoluble matter, and heavy metals (arsenic, lead, cadmium, mercury) at minimum.
PAC from China under HS code 2827.32 carries a 25 percent Section 301 tariff surcharge. Misclassification between HS 2827.32 and HS 2827.49 also affects the general duty rate. Confirm product origin and correct HS code classification before importing to avoid customs delays and unexpected duty charges.
For new EU drinking water installations commissioned after December 31, 2026, confirm the PAC product complies with applicable harmonized product standards and Commission Implementing Decisions under DWD 2020/2184. This requirement applies to treatment chemicals as well as contact materials.
PAC trade geography matters for both pricing and compliance documentation. According to WITS trade data compiled in the US EPA's 2022 supply chain risk profile, India ranked first globally in exports of aluminum chlorides (including PAC) in 2021 with 90 million kilograms, ahead of the Netherlands (52 million kg), Germany (49 million kg), Austria (34 million kg), and Spain (28 million kg). On the import side, Indonesia led at 43 million kg, followed by Malaysia (36 million kg), Italy (24 million kg), Germany (21 million kg), and Norway (18 million kg).
The US Section 301 tariff on Chinese PAC imports has reinforced the India-to-US trade route since 2018. Indian producers benefit from access to bauxite and aluminum hydroxide inputs at competitive cost and have become the dominant import source for the US market. For buyers in Southeast Asia and the Middle East, Chinese and Indian producers are the primary supply sources.
The EPA's supply chain risk rating for PAC is Moderate-Low overall: criticality is rated High (no effective large-scale substitute for coagulation), disruption likelihood is rated Low (no supply chain failures between 2000 and 2022), and vulnerability is rated Moderate-High due to US dependence on imported bauxite for aluminum hydroxide and the link to chlor-alkali industry for hydrochloric acid supply.
For water utilities and treatment plant operators in Asia, the Middle East, and markets outside the major producing regions, sourcing PAC through a trading partner with established supplier networks, quality verification capability, and cross-border logistics experience reduces the risk of receiving off-spec product that fails incoming testing or creates compliance problems at customs.
Yes. PAC is approved for drinking water treatment by the WHO, the US EPA (via NSF/ANSI/CAN 60 certification), the EU under DWD 2020/2184, and China under GB 5749-2022, among other regulators. The relevant safety control is residual aluminum in treated water, which should remain below 0.1 to 0.2 mg/L depending on facility type and market. Properly dosed and operated, PAC typically produces residual aluminum at or below these limits.
The most common regulatory standard is 0.2 mg/L in finished water, adopted by the EU (DWD 2020/2184), China (GB 5749-2022), and recommended by the WHO for smaller treatment facilities. The WHO recommends 0.1 mg/L for large facilities under good operating conditions. The US EPA's non-enforceable secondary standard is 0.05 to 0.2 mg/L.
PAC coagulation reduces PFAS concentrations but does not achieve complete removal on its own. A PubMed-indexed study found PAC achieved higher reduction of PFOS and PFOA at equivalent doses compared to alum and ferric chloride. Regulatory guidance recommends PAC as part of a multi-barrier treatment approach including granular activated carbon or advanced oxidation processes, not as a standalone PFAS removal solution.
PAC must carry a current NSF/ANSI/CAN 60 certificate covering the specific product grade and form (liquid or powder) being used. The certification is product-specific, not manufacturer-wide. Most US government water agencies require this certification as a contract condition. Verify certificate status directly on NSF International's online listing before purchasing.
Drinking water grade PAC meets stricter heavy metal limits, particularly for arsenic, lead, cadmium, and mercury. Under China's GB/T 22627-2014 drinking water grade standard, arsenic must not exceed 0.0005 percent, compared to less stringent limits in industrial grade standards. Industrial grade PAC is not suitable for drinking water treatment applications regardless of its aluminum content or basicity.
PAC produces lower and more consistent residual aluminum in treated water than alum because it is pre-hydrolyzed. Alum's in-situ hydrolysis is sensitive to pH and temperature, making residual aluminum harder to control consistently. PAC also coagulates effectively at pH 7.5 to 8.0 without requiring lime or sodium hydroxide dosing, reducing the number of chemicals utilities need to manage for compliance.
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Source Compliance-Ready PAC Through Tradeasia International |
Procurement teams buying PAC for cross-market water treatment projects face a consistent set of problems: navigating different certification requirements per destination market, verifying that Chinese or Indian-origin product meets the applicable drinking water grade standard, managing origin documentation for tariff compliance, and finding suppliers who provide batch-level quality data rather than generic product spec sheets.
Tradeasia International is a Singapore-headquartered chemical trading company with sourcing networks across Asia, the Middle East, and key producing regions. For water treatment grade PAC, Tradeasia manages supplier qualification, grade verification, quality certification, logistics coordination, and regulatory documentation for both liquid and powder forms across standard and high-basicity grades.
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Talk to Tradeasia About Your PAC Requirements Request a product specification sheet and batch certificate of analysis for your target grade, get a quote for your project volume, or speak with our team about certification and documentation requirements for your destination market. Visit: www.chemtradeasia.com | Email: contact@chemtradeasia.com |
PAC's regulatory status across all major markets is settled: it is approved, well-characterised, and subject to documented quality standards that procurement teams can specify against. What has shifted in 2026 is the compliance environment around it. The EU's January and December 2026 deadlines, the PFAS monitoring obligation that makes PAC's coagulation advantage more relevant, and the continuing Section 301 tariff pressure on Chinese-origin product in the US are all creating reasons to review supply arrangements that may have been set and forgotten.
The performance case for PAC over alum is reinforced by the direction of travel in water quality regulation: stricter residual aluminum control, PFAS monitoring requirements, lower sludge generation targets, and broader pH operating flexibility all point toward PAC. Alum remains cheaper per unit in some markets, but the total compliance and operational cost calculation increasingly favours the pre-hydrolyzed option.
For procurement teams, the practical work is in the documentation. The product is well understood. Getting the right certified grade, with batch-level quality data, from a supplier who can cover multiple regulatory jurisdictions, is where most of the execution difficulty lives. That is a sourcing and supply chain problem as much as a chemistry one, and it is where a qualified trading partner makes the most difference.
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