The pumps will eventually leak, and the grommets will eventually fail.
It's a really easy DIY job though, so start with the grommets and see if that works if the leak is in the pump area (F or R).
Just disconnect the electrical connector to the subject pump. No wiring issues if you do that first.
2002 E46M3, Imola/black, 6-speed, no sunroof, full Hybrid Audio Technology treatment.
2005 E53 X5 4.4i, Imola Red/black, Sport, Premium, Cold, Hybrid Audio Technology Imagine 6.5's
2011 E90 M3, Melbourne Red Metallic, Fox Red/Black, 6-speed, Premium 2, Heated seats, iPod/USB, Apex ARC 8's, Technic harness, JL 6/600