The Problem

South Africa's plastic reaches the sea through pipes we own, map and maintain.

This page sets out what is actually known about plastic leakage in South Africa, where the numbers come from, and why we believe the stormwater network — not the beach and not the recycling plant — is where the marginal rand does the most good.

How much is leaking

Estimates vary by an order of magnitude, and anyone who quotes you a single confident figure is selling something. The honest position is a range, with the reasoning attached.

The most-cited early global estimate placed South Africa among the world's worst marine plastic polluters, putting 90,000–250,000 tonnes per year into the ocean (Jambeck et al., 2015). A later South African review found this to be roughly six-fold too high, and estimated instead that between 15,000 and 40,000 tonnes per year is carried to the oceans from South African sources (Verster & Bouwman, 2020). We use the lower, domestically-derived range throughout this site.

The same review found that around 29% of total domestic waste — some 3.67 million tonnes a year — never enters a formal waste management system, and that roughly 440,000 tonnes of unmanaged plastic waste is released into the environment nationally. A separate material-flow analysis put total annual plastic leakage at 488 kilotonnes: 275 kt lost to open burning, 145 kt to land, and 68 kt directly into freshwater and marine environments (Stafford et al., 2022).

A historical measurement worth holding onto: in the Cape Town stormwater system alone, an estimated 3,000–4,000 tonnes of debris were deposited into the ocean each year in the early 2000s. One city. One drainage network.

Where the material comes from Not, mostly, from ships or from illegal dumping at the coast. It comes from ordinary consumption in ordinary neighbourhoods where collection is thin or infrequent, moves as street litter, and is flushed by rain. Around 80% of ocean plastic globally originates on land. The informal sector already recovers a remarkable share of what has value — an estimated 76% of all plastic entering South African recycling is collected informally — which tells you something important: the material still leaking is disproportionately the material nobody is paid to pick up. Films, wrappers, caps, straws, lids, polystyrene, sachets. Low value, high count, high mobility.

Why the stormwater outfall is the leverage point

Think about the pathway as a funnel. At the top it is impossibly wide: millions of individual disposal decisions across thousands of square kilometres. At the bottom it is impossibly wide again: an ocean. In the middle, for a few hundred metres, the entire catchment's litter is squeezed through a concrete pipe with a known diameter, a known location and a known owner.

Everything upstream of the outfall is behaviour change, which is slow and unverifiable. Everything downstream is dispersal, which is expensive and unrecoverable. The pipe is the only place where a modest amount of steel and labour removes a large, weighable mass.

Four properties make it uniquely attractive:

It is finite and countable. A metro has hundreds of significant outfalls, not millions. You can build a prioritised list and work down it.
It concentrates. One installation intercepts the runoff of an entire suburb, including the parts of that suburb you will never get a cleanup crew into.
It captures the "first flush". The initial surge of a rainfall event carries a hugely disproportionate share of the accumulated litter load. Being installed and empty when that surge arrives is most of the job.
It is measurable. Fixed location, defined catchment, dry material, discrete capture events. That gives you kilograms, polymer fractions and brand counts — evidence, not anecdote.

Why it is not already being done

Not because it is technically difficult. Gross pollutant traps and outfall nets are mature, unglamorous technology used routinely in Australia, the United States and elsewhere. The barriers in South Africa are structural, and worth naming plainly because they are what any new entrant will hit:

Barrier	What it actually looks like	What breaks it
No maintenance budget	Municipal stormwater is funded as a flood-safety function, not a pollution function. A device that needs servicing 20+ times a season has no line item.	Third-party funded servicing — the model on this site — or a dedicated stormwater utility charge.
Fear of flooding liability	Engineering departments reasonably refuse anything that could block a pipe during a storm.	Designed overflow at the hub and weir, documented, plus a written service schedule and a named responsible party.
Split ownership	The outfall belongs to roads or stormwater; the litter belongs to waste; the beach belongs to parks; the water belongs to a catchment agency.	Bring your own funding and your own labour and ask for permission, not money. It is a far easier conversation.
No evidence base	Nobody can tell you what one outfall yields per season in a South African catchment, so nobody can cost a programme.	Publish it. That is a large part of why this organisation exists.
Cleanup optics economy	Sponsorship money flows to photogenic beach cleanups with high volunteer counts and low measured mass.	Offer funders something a beach cleanup cannot: audited kilograms and a brand audit.

The policy window is open right now

South Africa's Extended Producer Responsibility regulations, made under the National Environmental Management: Waste Act and in force since 5 May 2021, place a legal obligation on producers of plastic packaging to fund the post-consumer fate of their products, either through their own scheme or through a Producer Responsibility Organisation. Producers are registered, fees are being collected, and targets are being reported against.

This is the single most important fact about funding this work today. There is now a regulated, audited flow of corporate money whose entire purpose is to deal with packaging after it is thrown away — and its performance is measured in tonnes with evidence attached. Reported collection performance has been strong where the material has value: PETCO reported 87% of PET beverage bottles recycled in 2025, up from 76% the year before. But EPR performance is measured against material recovered for recycling, which structurally under-serves exactly the low-value, high-leakage items that dominate what comes out of a stormwater pipe.

That gap — between what EPR pays for and what actually leaks — is the space this organisation is built to occupy. The funding argument is set out in full here.

Sources

Verster, C. & Bouwman, H. (2020). Land-based sources and pathways of marine plastics in a South African context. South African Journal of Science, 116(5/6). Read
Stafford, W. et al., as synthesised in: Addressing plastic pollution and waste flows: insights from South Africa's experience (2024). Read
CSIR. Towards understanding the impact of marine plastic debris on ecosystem services and the economy in South Africa. Read
CMS Expert Guide: Plastics and packaging laws in South Africa (EPR regime and timelines). Read
WWF South Africa. Extended Producer Responsibility for plastic packaging: synthesis report. Read
The Ocean Cleanup. Rivers programme — 1,000 rivers carry roughly 80% of riverine plastic to the ocean. Read
PETCO 2025 performance, reported May 2026. Read

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