Residents are paying for waste that should have been recycled
In the coastal district of Vila Nova de Gaia, a quiet but consequential rupture has opened between a municipality and the company entrusted with its refuse — a dispute that is, at its heart, about who bears the cost of waste that need not have been wasted at all. Since 2022, city officials allege, Suldouro has systematically overbilled Gaia to the tune of €10.7 million, inflating charges by failing to meet the recycling targets that would have kept sorted materials out of the more expensive general waste stream. Beginning in December 2025, Gaia will withhold 30 percent of all invoices — a measured act of financial resistance that signals the matter has outgrown the contractor relationship and now awaits the judgment of regulators.
- Gaia's city council is preparing to formally confront Suldouro with evidence of nearly four years of alleged overbilling, a confrontation that will play out in public session and before regulatory bodies.
- At stake is €10.7 million already paid in excess, with projections warning of another €3 million in annual overcharges through 2027 if nothing changes.
- The recycling failure at the center of the dispute is stark: Suldouro collected sorted waste at barely half the efficiency the city believes was achievable, sending thousands of recoverable tons into the costlier general waste stream — and onto residents' tax bills.
- Gaia and neighboring Santa Maria da Feira have already signaled solidarity by abstaining from approving Suldouro's 2025 accounts, suggesting the conflict may widen to affect other municipalities in the concession.
- The 30 percent payment withholding — roughly €4.8 million annually — is framed as provisional, but its implementation marks a clear escalation toward a formal settlement process whose outcome officials say will favor the municipality.
Vila Nova de Gaia has decided it will no longer pay its waste management contractor in full. From December onward, the municipality will remit only 70 percent of invoices submitted by Suldouro, the company responsible for collecting and processing the district's refuse. The decision follows what city officials describe as a systematic pattern of overbilling stretching back nearly four years, totaling approximately €10.7 million in excess payments since 2022.
The dispute centers on what the city calls countervalue payments — the contractual obligation to cover gaps between waste fee revenues and operational costs. Gaia argues that Suldouro has inflated these claims by failing to meet selective waste collection targets. In 2024, Suldouro sorted just 10.5 percent of total waste handled — roughly 15,479 tons out of nearly 146,000 — when city planners believe efficiency could have doubled. The shortfall meant thousands of recoverable tons of paper, plastic, metal, and glass were processed as general waste, at a cost of around €80 per ton borne ultimately by residents through the waste management tax.
The city estimates it is losing approximately €5 million per year to these combined failures. Part of the problem, Gaia contends, lies in Suldouro's own operational choices: selective collection points were placed twice as far from homes as standard bins, suppressing participation. A later door-to-door program added costs without meaningfully improving results.
The payment reduction is described as provisional, pending a formal regularization process involving regulatory bodies beyond Suldouro itself. With Suldouro billing Gaia €16.2 million annually, the 30 percent withholding amounts to roughly €4.8 million per year until the dispute is resolved. The neighboring municipality of Santa Maria da Feira has already signaled alignment with Gaia's position by abstaining from approving Suldouro's 2025 accounts — a sign that the conflict may carry consequences well beyond a single contractor relationship.
Vila Nova de Gaia has decided to stop paying its waste management contractor in full. Starting in December, the municipality will remit only 70 percent of the invoices submitted by Suldouro, the company responsible for collecting and processing refuse across the district. The decision stems from what city officials describe as a systematic pattern of overbilling stretching back nearly four years.
According to documents prepared for the city council's public meeting scheduled for Tuesday, Gaia claims it has paid Suldouro approximately 10.7 million euros more than it should have since 2022. In 2025 alone, the overage reached 1.9 million euros. The city's leadership, headed by mayor Luís Filipe Menezes, argues that these excess payments will continue unless something changes—projections suggest another three million euros annually through 2027.
The core of the dispute involves what the city calls "countervalue payments." When revenue from waste collection fees falls short of operational costs, the municipality is contractually obligated to cover the gap. Gaia contends that Suldouro has inflated these claims by failing to meet selective waste collection targets. In 2024, Suldouro collected only 15,479 tons of sorted materials—roughly 10.5 percent of the 145,935 tons of total waste handled across the municipality. City planners estimate that with better efficiency, selective collection could have doubled, capturing an additional 15,000 tons of paper, cardboard, plastic, metal, and glass annually. Instead, these materials ended up in the general waste stream, which residents ultimately paid to process through the waste management tax.
The financial impact is substantial. At approximately 80 euros per ton for collection costs, Gaia calculates it has paid roughly three million euros annually for waste that should have been diverted through selective collection. Combined with the countervalue shortfalls, the city says it is losing about five million euros per year to what it views as Suldouro's operational failures. Over the three-year period from 2022 to 2024, this totals nine million euros that the city believes should be recovered.
Gaia's response—withholding 30 percent of payments—is framed as a temporary measure. The city council document states the reduction will remain "provisional" pending a formal regularization process that will involve not only Suldouro but other regulatory entities. The final settlement, officials suggest, will ultimately favor the municipality. Suldouro's annual billing to Gaia stands at 16.2 million euros, meaning the 30 percent reduction will amount to roughly 4.8 million euros annually until the dispute is resolved.
The underlying problem, according to the city, lies in Suldouro's operational choices. Selective waste collection points have been positioned twice as far from residents' homes as standard waste containers, a policy the city believes has suppressed participation rates. A door-to-door collection program introduced later, while generating additional costs, failed to meaningfully improve results. Gaia notes that collection efficiency has improved somewhat thanks to municipal investments, but remains far below national and European targets.
The dispute emerged when both Gaia and the neighboring municipality of Santa Maria da Feira abstained from voting on Suldouro's 2025 accounts at the company's shareholder assembly. Both cities objected to how the accounts reflected selective collection and treatment costs in the invoices sent to municipalities. The payment reduction strategy signals that Gaia is prepared to escalate the conflict, suggesting that resolution will require intervention beyond the immediate contractor relationship and may have implications for other municipalities served by Suldouro.
Notable Quotes
The selective waste collection policy, placing ecopoints at twice the distance of standard containers, is certainly at the root of the poor results achieved.— Vila Nova de Gaia municipal council document
The situation of insufficient countervalue payments is expected to persist at least through 2027, at approximately three million euros per year.— Gaia's Provisional Management Instruments (IGP) for 2025
The Hearth Conversation Another angle on the story
Why would a city council decide to withhold a third of payments rather than simply refuse to pay or take the company to court?
Because they're still dependent on the service. Waste collection doesn't stop because you're in a dispute. You need the trucks running tomorrow. Withholding 30 percent is a way to apply pressure while keeping the system functioning—it's leverage without rupture.
But doesn't that just shift the problem? If Suldouro is underfunded, won't service quality drop further?
Possibly. But Gaia's argument is that service quality is already poor—that's the whole complaint. They're saying Suldouro has been paid handsomely to do something it's failing at. The withholding is a signal that the current arrangement is unsustainable.
The selective waste collection rate is only 10.5 percent. That seems remarkably low. Is that a Suldouro problem or a resident behavior problem?
Likely both. Suldouro placed collection points twice as far away as regular bins—that's a deliberate operational choice that discourages participation. But residents also have to want to sort their waste. The city thinks better placement and logistics could double the rate. That's not a guess; it's based on what similar systems achieve elsewhere.
So residents are paying for waste that could have been recycled but wasn't?
Exactly. The waste management tax covers the cost of processing everything—including materials that should have been diverted. When selective collection fails, those materials go into the general stream at higher cost. The city is saying residents are subsidizing Suldouro's inefficiency.
Will other municipalities follow Gaia's lead?
That's the open question. The document mentions Santa Maria da Feira abstained from voting on the same accounts, suggesting they have similar concerns. If Gaia's withholding strategy works—if it forces a reckoning—others might do the same. If it fails, they'll likely avoid the confrontation.
What happens if this drags on unresolved?
The city says the overage will continue at roughly three million euros annually through 2027. That's real money that could go elsewhere. Eventually, either Suldouro changes its operations, or the contract gets renegotiated, or the relationship breaks. Something has to give.