Yeah, a lot should be coordinated at EU level to stop this practice. For example, if one country finds illegal trash trying to be imported at its borders, then the country of origin should bare part of the environmental fine in order to encourage self policing and environmental responsibility at the source instead of putting all the burden of policing at the poorer target countries since as it stands right now, western EU countries "get greener" by pushing their trash to Romania, and then scold Romania at the European Commission for being too polluted lol.
However, here's a major issue I found in the link you shared (translated to English via DeepL):
"The landfill in Glina [Bucharest, Romania] is a health hazard for citizens and the European Commission recognized this a few years ago. According to the law, landfills must be at least 1000 meters away from people's homes, but the one in Glina is only 70 meters away. The National Environmental Guard has never thoroughly checked the entire area, and there is evidence that hazardous waste may also be hidden there. Underneath the mountains of rubbish that have risen up near Bucharest no one knows what is really hidden and how much damage is being done to the land in that area.
In 2017, environmentalists warned that there was even cyanide pollution at Glina that could reach Bucharest. Prosecutors also opened an investigation after it was discovered that a Romanian company was discharging cyanide waste at the Glina dump, but these cases never reached final decisions because the trials were far too long, bogged down in courtroom proceedings and the facts were time-barred."
The problems I see here are two fold:
One, the Romanian authorities can't be bothered to police what's happening meters away from the capital city, where all the government institutions and politicians are.
And two, it seems like whenever something foul gets uncovered, the Romanian justice system is so incompetent, that nothing happens in the end and the perpetrators get away scot free on technical failures of the system, which only serves to attract and encourage further criminal activity of this nature.
This is a systemic failure on the Romanian side of epic proportions and needs to be addressed ASAP.