Galleria Nazionale d'Arte Moderna - Rome
1906 The Art Institute of Chicago
Musée Marmottan-Monet - Paris
Musée de l'Orangerie - Paris
FYI, white water lilies are the national flower of Bangladesh.
and he said:
It took me time to understand my waterlilies. I had planted them for the pleasure of it; I grew them without ever thinking of painting them.