What is the coil rating is amps of the relay coil? If not known then what is the resistance?
If the amperage is less than 20ma then there is know problem driving it from the PIC as long as you have a fly-back diode installed. You need the fly-back for the transistor too.

The above info is needed even if you use a transistor.

Simplify things a bit. What is the amperage if the valves that the relays will be controlling?
Then we pick a MOSFET to drive the device directly doing away with the relay and transistor.