The 2026 data-driven guide to PEG compounds and 1,4-dioxane contamination in Australian shampoos, lotions and personal care — New York's 2023 ban context

The short version

PEG compounds (polyethylene glycol) — and the wider family of polyoxyethylene-, sodium laureth-, ceteareth-, and related ethoxylated ingredients — appear in roughly 30% of shampoos, conditioners, body washes and lotions sold across the Australian aisle. PEG ingredients themselves are not the primary concern; the concern is the manufacturing-process contaminant 1,4-dioxane — a US EPA “likely carcinogen,” IARC Group 2B substance, and primary driver behind New York State’s 2023 cosmetic limit of 2 ppm 1,4-dioxane (effective January 2023, tightening to 1 ppm in 2024). The contaminant forms during ethoxylation — the chemical step that creates PEG ingredients — and is incompletely removed by standard manufacturer practice.

This guide explains what PEGs are, why 1,4-dioxane forms during their manufacture, and how to identify PEG-containing products on Australian labels. For brand-level scanning, the Low Tox Gear Scanner flags PEG compounds and the broader ethoxylated family under the peg_compound concern tag.

What PEG ingredients are and how they get contaminated

PEG compounds are polymers of ethylene oxide — chains of -OCH2CH2- repeating units capped with hydrogens, hydroxyls, or fatty acid esters. The polymerisation reaction is called ethoxylation: ethylene oxide gas reacts with a starting molecule (often a fatty alcohol or fatty acid) under pressure, building up the polymer chain step by step.

The chemistry produces side reactions, the most concerning of which is 1,4-dioxane formation. Ethylene oxide can dimerise into 1,4-dioxane during the polymerisation step. Standard vacuum stripping and steam-stripping reduces 1,4-dioxane content but does not eliminate it. The result: PEG-containing ingredients carry detectable 1,4-dioxane residuals.

This applies not only to ingredients labelled as “PEG-X” (where X is a number indicating average molecular weight), but to the entire ethoxylated family — sodium laureth sulfate, ceteareth-20, oleth-10, steareth-20, polysorbate-20, polysorbate-80, and dozens of other -eth and -oxynol ingredients.

What 1,4-dioxane actually does

  • IARC Group 2B — possibly carcinogenic to humans. Based on liver and nasal tumour findings in rats and mice at high oral and inhalation doses. The classification is from 1999, reaffirmed periodically.
  • US EPA — “Likely Human Carcinogen” classification with an oral cancer slope factor of 0.1 (mg/kg/day)-1.
  • Skin absorption is documented. 1,4-dioxane is small enough to cross the skin barrier and has been measured in blood and urine of consumer-product users.
  • Environmental persistence. 1,4-dioxane is highly water-soluble, persistent in groundwater, and resistant to standard drinking-water treatment. It’s a documented drinking-water contaminant in regions with industrial-effluent and consumer-product wastewater.

Regulatory landscape

  • New York State (USA) — 2023 cosmetic limit: Cosmetic products manufactured after 1 January 2023 limited to 2 ppm 1,4-dioxane. Tightened to 1 ppm from 1 January 2024. The most ambitious cosmetic 1,4-dioxane regulation worldwide.
  • FDA (USA): Tests products for 1,4-dioxane via the FDA cosmetic-chemistry program but has no specific concentration cap. Industry self-regulates under FDA-Cosmetic guidance.
  • California (USA): Considering Prop 65 listing pathway for 1,4-dioxane in cosmetics (not yet listed).
  • EU SCCS: Established cosmetic limit of 10 ppm in finished products in 2014, lowered to 1 ppm in 2018 for many product categories.
  • Australia (AICIS): No specific concentration cap on 1,4-dioxane in cosmetic products. Standard cosmetic ingredient safety review applies.

What testing has actually shown

Recent New York State Department of Environmental Conservation (NYSDEC) and FDA testing snapshots:

  • 2019 NYSDEC initial cosmetic testing: 1,4-dioxane detected above 1 ppm in 35% of conventional shampoos, 27% of body washes, 18% of children’s bath products. Levels ranged from below detection to 17 ppm.
  • FDA 2018-2020 industry testing: Major manufacturers reported reducing 1,4-dioxane levels from average 5-10 ppm to consistent <2 ppm in newer formulations through improved manufacturing controls.
  • Independent EWG 2009 testing: 1,4-dioxane detected in 22% of personal care products tested. Higher concentrations in baby shampoos and bubble baths than in adult products. The 2009 study drove much of subsequent consumer-facing awareness.

The trend is positive — manufacturer improvements over the past decade have reduced typical contamination levels — but residuals remain detectable in many products, and not every brand has invested equally in stripping.

Where PEG ingredients appear in the AU aisle

From publicly disclosed ingredient lists across the Australian aisle:

  • Mass-market shampoo and conditioner. Most non-organic ranges contain Sodium Laureth Sulfate (SLES) and PEG-7 olivate or similar PEG emulsifiers.
  • Shower gels and body washes. Similar pattern — ethoxylated surfactants dominate.
  • Children’s bubble bath and shampoo. Historically highest 1,4-dioxane levels. Many reformulated since 2010.
  • Hand soaps and dishwashing liquid. SLES + PEG ingredients are common.
  • Lotions and creams. PEG-X stearate, ceteareth-20, and similar emulsifiers.
  • Cleansing balms and makeup removers. PEG-7 glyceryl cocoate, PEG-40 hydrogenated castor oil.
  • Foundations, BB creams, sunscreens. PEG emulsifiers common in liquid formulations.

How to identify PEG and ethoxylated ingredients

The full list to watch for (long because the chemistry family is large):

  • PEG-X (any number) — direct PEG ingredient
  • Polyethylene Glycol
  • Sodium Laureth Sulfate (SLES) — ethoxylated cousin of SLS
  • Ammonium Laureth Sulfate
  • Ceteareth-X, Steareth-X, Oleth-X, Laureth-X — the X is a number indicating average polymer chain length
  • Polysorbate-20, -60, -80 — also ethoxylated
  • Cocamide DEA — surfactant amide
  • Polyoxyethylene (any compound name)
  • Polyethoxylated tallow amine
  • Anything ending in -eth-X or -oxynol-X

If any of these are in an ingredient list, the product contains an ethoxylated ingredient with potential 1,4-dioxane contamination.

How the Low Tox Gear Scanner flags PEG compounds

The scanner flags PEG-X compounds, ethoxylated surfactants (SLES, ceteareth, oleth, laureth, etc.), and polysorbates under the peg_compound concern tag. Default severity is amber — this is a precautionary flag based on the contamination concern, not a direct concern about the PEG ingredient itself. Escalates to red for users selecting: pregnancy, eczema, contact_dermatitis (since contamination concerns are higher in skin-barrier-compromised users), fertility.

For curated alternatives:

What works as a PEG alternative

  • Sucrose-based and glucose-based surfactants. Lauryl glucoside, decyl glucoside, coco-glucoside — plant-derived from sugar + plant oils. No ethoxylation step, no 1,4-dioxane concern.
  • Amino-acid-based surfactants. Sodium lauroyl sarcosinate, sodium cocoyl glycinate. Gentle, no ethoxylation.
  • Lecithin-based emulsifiers. Plant lecithin from sunflower or soy. Natural emulsification chemistry.
  • Saponified plant oils (true castile soap). Olive, coconut, or palm oil saponified with potassium hydroxide. Bronner’s, ethique, Dr Wood’s.

Best practice — what we recommend

  • For families with young children and infants, prioritise PEG-free baby shampoo and bubble bath. The 2009 EWG testing identified children's products as historically the highest 1,4-dioxane contamination tier, and skin absorption is higher through immature skin barriers.
  • For pregnancy and breastfeeding, conservative PEG reduction is reasonable. The combined skin absorption pattern over months of daily product use is a relevant exposure consideration.
  • For chronic eczema and barrier-compromised skin, the 1,4-dioxane absorption increases through inflamed skin. PEG-free formulations are preferred.
  • For routine adult use without specific sensitivities, modern manufacturer improvements have substantially reduced typical 1,4-dioxane levels. The case for PEG avoidance is precautionary rather than urgent.

Related guides on Low Tox Gear

Sources

  1. New York State Department of Environmental Conservation. 1,4-Dioxane in Consumer Products Standards. Effective 1 January 2023 (2 ppm), 1 January 2024 (1 ppm).
  2. IARC Monographs on the Evaluation of Carcinogenic Risks to Humans, Vol 71 (1999) and Vol 101 (2012). 1,4-Dioxane classification.
  3. US EPA. Integrated Risk Information System (IRIS) Toxicological Review of 1,4-Dioxane (CASRN 123-91-1). 2013, updated 2020.
  4. SCCS (Scientific Committee on Consumer Safety). Opinion on 1,4-dioxane impurity in cosmetic ingredients. SCCS/1538/14, lowered limits 2018.
  5. Environmental Working Group. Detected and Concealed: Carcinogenic 1,4-Dioxane Contamination of Cosmetics. March 2009.
  6. Black RE, Hurley FJ, Havery DC. Occurrence of 1,4-dioxane in cosmetic raw materials and finished cosmetic products. Journal of AOAC International 2001;84(3):666-670.

Frequently asked questions

Is PEG bad for you?

PEG ingredients themselves are generally considered safe in cosmetic formulations and are widely permitted under FDA, EU SCCS, and AICIS standards. The concern is the manufacturing-process contaminant 1,4-dioxane — a US EPA 'likely carcinogen' and IARC Group 2B substance — which forms during the ethoxylation reaction that creates PEG ingredients. Modern manufacturing reduces 1,4-dioxane to low residual levels, but trace contamination remains in many products.

What is 1,4-dioxane?

1,4-Dioxane is a small molecule (C4H8O2) that forms as a side product when ethylene oxide polymerises into PEG and related ethoxylated ingredients. It's classified as 'likely human carcinogen' by US EPA based on liver and nasal tumour findings in animal studies, and IARC Group 2B. It's water-soluble, persistent in groundwater, and absorbed through skin.

Why did New York ban it?

New York State established a cosmetic 1,4-dioxane limit of 2 ppm effective January 2023, tightening to 1 ppm in 2024 — based on cumulative exposure concerns from cosmetic product use, particularly in children. This is the most ambitious cosmetic 1,4-dioxane regulation worldwide and applies to products sold in New York regardless of where manufactured.

How do I identify PEG ingredients?

Look for: 'PEG-' followed by a number; 'Polyethylene Glycol'; 'Sodium Laureth Sulfate' (SLES); any '-eth-X' ending (ceteareth-X, steareth-X, oleth-X, laureth-X); 'Polysorbate-20/60/80'; 'Cocamide DEA'; 'Polyoxyethylene'. If any of these are in the ingredient list, the product contains an ethoxylated ingredient with potential 1,4-dioxane contamination.

Is Sodium Laureth Sulfate (SLES) safe?

SLES is the ethoxylated version of SLS (Sodium Lauryl Sulfate). It's milder on skin than SLS but introduces the 1,4-dioxane manufacturing contamination concern. The contamination level depends on the manufacturer's vacuum-stripping and steam-stripping process quality. Major brands have substantially improved since 2010-2015, with typical SLES-containing products now testing below 2 ppm 1,4-dioxane.

What's a PEG-free alternative?

Glucose-based and sucrose-based surfactants (lauryl glucoside, decyl glucoside, coco-glucoside) are plant-derived alternatives without ethoxylation. Amino-acid-based surfactants (sodium lauroyl sarcosinate, sodium cocoyl glycinate) are also gentle and PEG-free. True castile soap (saponified plant oil with KOH) is the simplest natural surfactant approach. Brands like Dr. Bronner's, Ethique, and most certified organic personal care use these alternatives.

Should I avoid PEG ingredients in baby products?

Yes, particularly in baby bath and shampoo. EWG's 2009 testing identified children's products as historically the highest 1,4-dioxane contamination tier — sometimes 5-10× higher than adult products from the same brand. Skin absorption is also higher through immature infant skin barriers. PEG-free baby shampoo and bubble bath is the conservative choice.