If the peas are showing yellow mottling, banding, spotting or striping, they may be virused. If they are, you need to remove and burn or dispose of them.
the question of whether its okay to use grey water is a tough one - it rather depends what detergent/soap products are contained within it. Eco friendly detergent/soaps will be fine, not too sure about standard soaps and detergents, I'd be reluctant to use it on small plants, but on the other hand, if that's the only water available, it might have to do.

is grey water from kitchen harmful to plants

type the above in your search engine box some interesting reading on the sites that show. can't copy and post due to copyrights law. the other thing worth thinking about is to use old tights to filter it, not when 'er in doors' is wearing them. only on established plants never on seed and spray/pour on ground not over the plants. Mulching helps to kill off quickly any harmful bacteria as well as retaing moisture...the litte info i've been told.

Thank you very much for the comments

In the extremely dry summer of '76 I used grey water to throw over my rose bushes to keep the greenfly down. It worked - and also gave me self-seeded tomato plants (from all the salads we ate) that fruited too late for the tomatoes to turn red, but gave me jars of Green Tomato Chutney. ;o)