When Maryse Fourcade takes a stroll near her home in Paris, she can see the Eiffel Tower and the Mirabeau bridge.
Less romantically, she can also see a cement factory.
The operator is Swiss-headquartered construction giant Lafarge Holcim.
And it's in hot water with residents and local prosecutors.
"We first found a concrete mixer pouring white liquid directly in the River Seine", says Fourcade, who is a member of a campaign group seeking the closure of the plant.
Lafarge is accused of tipping industrial waste into the river at two separate locations.
Footage has emerged of one alleged incident.
Photos also show waste being dumped from the Lafarge site near the Mirabeau bridge.
Now the firm says it is taking immediate action to make sure it doesn't happen again.
The accusations are part of a broader tensions in France over what sort of city Paris should be: a picturesque haven for residents and tourists, or global capital with a vibrant economy?
A spokesman for the Paris prosecutor's office said a probe has been opened after the video footage emerged.
In a statement, Francois Petry, the head of Lafarge Holcim France said: "We take these isolated incidents that took place in two of our sites by La Seine very seriously."
He added that the firm's Paris sites will undergo an audit, and a re-training programme for staff.