It would be better if you could provide some more details, your description is fairly vague. Are you responsible in your position to maintain a code compliance? Are you performing your tasks to established protocols and are noticing others are not? Are these things you notice a life and safety issue? For example, could someone get hurt or sick because of these lapses?
Also, are you certain that compliance isn't being met outside of what you see. For example, you're maybe not privy to the contracts between your company and the customer, perhaps what you see as a lapse is actually an agreed upon contract/procedure change?
First thing I would do is document it in a memo what you have seen to the senior supervisor and copy your HR department if you have one.
Keep it positive, maybe this is an opportunity for you to get a promotion.
"I know our company strives to provide our loyal customers with an outstanding product and I have noticed some lapses in our established protocols. I wanted to bring this to your attention in case you felt any corrective action needs to be taken on our part."
"I noticed we do not do such and such anymore, is this a new procedure?"
Then I would document in a private log book everything you saw and when you saw/see it.
Last piece of advice, if you aren't really that worried about it, if it is a minor thing, drop it.
If it is a major thing, and you want to pursue it further, take a one hour consult with a labor law specialist in your area. Pay for a half our consult, tell him everything and hear what they say. I'm sure they can give you more sound advice than what you are getting here.
Good luck, let us know what happened.