The Harmful Effects of E-Waste

The harm does not come from the volume of material discarded. It comes from what happens to a narrow set of substances inside that material once a device stops being a device. Electronic waste affects nearly every system in the human body because the materials that make up e-waste contain a plethora of toxic components, including mercury, lead, cadmium, polybrominated flame retardants, barium, and lithium.

Harmful Effects of eWaste

What Is Actually Inside E-Waste

Substance Where it typically appears Concern when released
Lead CRT funnel glass, pre-2006 solder, lead-acid backup batteries Neurotoxic; children absorb it more readily and show effects at lower exposures
Mercury Backlight lamps in older LCD panels, tilt switches, some relays Damages the nervous system and kidneys; converts to methylmercury in waterways
Cadmium Older nickel-cadmium batteries, some semiconductors and pigments Accumulates in kidneys and bone over years of low-level exposure
Hexavalent chromium Corrosion-resistant coatings on metal chassis and fasteners Respiratory irritant and established carcinogen by inhalation
Beryllium Copper-beryllium springs, connectors, thermal interfaces Inhaled dust can cause chronic beryllium disease, an irreversible lung condition
Brominated flame retardants Board laminate, plastic housings, cable insulation Endocrine disruptors; associated with thyroid and neurodevelopmental effects
Lithium Rechargeable cells in nearly every portable device Thermal runaway and fire in collection trucks, transfer stations and shredders
Barium Front-panel glass of CRT displays Affects muscle and cardiovascular function at high exposure
PVC Cable jacketing and wire insulation Releases dioxins and furans when burned below full combustion temperature

Two things complicate that list.

First, restriction rules changed the mix. The EU’s RoHS directive and California’s own RoHS provisions under SB 20 capped lead, mercury, cadmium, hexavalent chromium and two classes of brominated flame retardants in covered devices. A phone manufactured in 2024 carries far less of these than one manufactured in 2004.

Second, the restrictions did not solve the problem. Exemptions remain in force for applications with no viable substitute. Legacy equipment keeps arriving at recycling facilities twenty years after manufacture. Whole categories — industrial controls, medical equipment, infrastructure hardware — sit outside consumer restriction rules. And lithium, the fastest-growing hazard in the waste stream, was never restricted at all.

Four Ways E-Waste Toxins Reach People

The route matters more than the inventory. The same device produces entirely different harms depending on how it is discarded.

Landfill Leaching

Buried electronics sit in an acidic, anaerobic environment. Rainwater percolating through refuse picks up dissolved metals and carries them downward as leachate.

Modern lined landfills capture most of this. Older unlined sites, illegal dumps and liner failures do not. Once leachate reaches an aquifer, contamination is expensive to reverse and often permanent within any useful timeframe.

Open Burning

Burning cable and boards is the fastest way to recover copper without equipment, which is why it dominates informal recovery. It is also the most damaging.

PVC insulation combusting at low temperature produces dioxins and furans, among the most persistent organic pollutants known. Brominated flame retardants generate brominated analogues. The smoke carries fine particulate matter and polycyclic aromatic hydrocarbons directly into the lungs of whoever is standing near the fire, and downwind into the surrounding community.

Acid Leaching and Manual Dismantling

Recovering gold from connectors using nitric or hydrochloric acid baths, without ventilation or containment, exposes workers to acid mists and dumps metal-laden effluent into soil and surface water.

Manual dismantling — hammering, prying, cracking CRT glass — generates lead and beryllium dust in enclosed spaces.

Occupational and Take-Home Exposure

This pathway leaves no visible trace. Dust settles on clothing, skin and tools. Workers carry it into vehicles and homes, where it reaches family members who never went near the site.

In informal recycling communities, exposure is not confined to the people doing the work.

Harmful Effects of E-Waste on Human Health

The World Health Organization’s 2021 report Children and Digital Dumpsites is the most systematic assessment of the health evidence to date.

For prenatal and childhood exposure, the WHO links e-waste toxicants to:

  • Impaired neurological and behavioural development, including reduced cognitive and language scores
  • Adverse birth outcomes such as stillbirth, premature birth and low birth weight
  • Poorer lung function and increased respiratory symptoms including cough, wheeze and asthma
  • Immune system effects including greater vulnerability to infection and reduced immunization response
  • Elevated risk of chronic disease later in life, including cancer and cardiovascular disease

Two features of these harms are worth stating plainly.

They are front-loaded onto the people least able to avoid them. The WHO estimates that as many as 18 million children and adolescents and 12.9 million women may be at risk of adverse health outcomes linked to e-waste recycling.

Children are not simply smaller adults in this context. They absorb more per unit of body weight, their neurological development is actively underway, and they lack the agency to leave a contaminated area.

The harms also arrive late. Lead’s effect on cognition is not visible the week of exposure. Cancers associated with dioxin exposure have latency periods measured in decades. By the time harm is measurable, the exposure that caused it is years in the past and the responsible material is untraceable.

Harmful effects of e-waste in human body

Harmful Effects of E-Waste on the Environment

Environmental damage from e-waste is distinctive in one respect: it does not dilute.

Heavy metals do not break down. Persistent organic pollutants like dioxins and PBDEs resist degradation for decades. Both classes bioaccumulate — concentrating in the tissue of organisms that absorb them — and then biomagnify, reaching higher concentrations at each step up the food chain. A contaminant that measures as negligible in sediment can measure as significant in fish, and higher again in the people eating the fish.

  • Soil contamination around informal processing sites reduces agricultural viability and provides a continuing exposure route through dust and through crops grown in place.
  • Groundwater and surface water contamination spreads downstream from the point of release and is not confined to the jurisdiction that produced the waste.
  • Air deposition returns airborne particulates and dioxins to land and water at distance from the fire that generated them.
  • Resource loss compounds all of it. The raw materials in the 62 million tonnes of e-waste generated in 2022 were valued at USD 91 billion, of which only USD 19 billion was recovered through environmentally sound recycling. Every tonne dumped is a tonne that has to be mined again somewhere else.

Four E-Waste Statistics That Are No Longer Accurate

Much of what gets repeated about e-waste describes a world of CRT monitors and pre-restriction manufacturing. These figures were accurate when first published. They are not accurate now, and four of them turn up often enough to be worth correcting.

"The average computer screen contains five to eight pounds of lead."

The original claim specified a cathode ray tube screen. CRTs left the retail market roughly two decades ago. Modern LCD and LED panels contain no lead-glass funnel at all. Stated without the CRT qualifier, this is simply false.

"E-waste is 2% of landfill volume but 70% of toxic waste."

Traces to a mid-2000s figure the EPA no longer publishes. No current federal data supports it. The related global framing — that e-waste accounts for a large share of reported hazardous toxicants in the environment — is defensible. The specific US landfill ratio is not.

"Carnegie Mellon predicts 70 million computers in US landfills."

This was an estimate, not a prediction. It dates from a period when the installed base of computers looked nothing like today's. It is also routinely restated as a forecast about the future, which it never was.

"Only 12.5% of e-waste is recycled."

Superseded. The UN's Global E-waste Monitor puts the current figure at 22.3% — less than a quarter of the e-waste generated in 2022 was documented as properly collected and recycled, out of a record 62 million tonnes produced that year, on track to reach 82 million tonnes by 2030.

What Changed in January 2025

For most of the period during which the standard e-waste narrative formed, exporting non-hazardous electronic scrap was largely unregulated. That is no longer the case.

As of 1 January 2025, international shipments of electrical and electronic waste and scrap — for recovery, recycling or disposal — are permitted only with the prior written consent of the importing country and any transit countries. This is the first time non-hazardous e-waste and scrap has been controlled under the Basel Convention. The amendments were adopted at the fifteenth Conference of the Parties in June 2022 and took effect at the start of 2025.

The change matters for two reasons. It closes the classification gap that let material move as “used equipment” or “non-hazardous scrap” while ending up in the same informal processing sites. And it means the exposure question for any organization disposing of equipment is now partly a documentation question: where the material went, who consented to receive it, and whether that is on paper.

Why California Treats E-Waste as Hazardous Waste

California classifies discarded electronics as universal waste, a subcategory of hazardous waste. That classification is why putting a monitor in a dumpster is not a housekeeping decision here — it is a disposal violation.

The framework arrived early:

  • 2001 The state clarifies that CRT devices are hazardous when disposed of.
  • 2002 Universal waste rules prohibit electronics disposal, with a household exception running through 2006.
  • 2003 The Electronic Waste Recycling Act (SB 20) passes, carrying California's own restrictions on hazardous substances in covered devices alongside a funding mechanism for collection and recycling.
  • 2004 SB 50 amends the Act.
  • 2005 The Covered Electronic Waste recycling program begins operating.

Frequently Asked Questions

Lead, mercury, cadmium, hexavalent chromium, beryllium and brominated flame retardants account for most of the documented health risk. Lithium is the fastest-growing hazard, though its primary risk is fire during collection and processing rather than chronic toxicity.

Generally no. Intact devices in a dry indoor space are stable. The exception is lithium batteries, which can fail in storage — particularly if swollen, damaged or exposed to heat. Risk begins at the point of crushing, burning or burial.

Less than they used to, but yes. RoHS restrictions cut the levels of six substance classes in covered devices. Exemptions, legacy equipment, uncovered product categories and lithium all remain.

Soil and groundwater contamination, surface water pollution downstream of processing sites, airborne deposition of dioxins and particulates, and the loss of recoverable metals that then have to be mined again. In practice the two categories converge, since contaminated soil and water are themselves exposure routes.

Only if the process is controlled. Informal recycling — open burning, acid leaching, unprotected manual dismantling — is a major source of exposure, not a solution to it. The distinction is between recycling and documented, environmentally sound recycling, which is why chain-of-custody records matter as much as the intention to recycle.