Just call the Foxboro Board of Health. I don't think this is a lawsuit matter.
To questioners from West Virginia & New York: Although I am licensed to practice in your state, I practice on a day-to-day basis in Massachusetts. I answer questions in your state in areas of the law in which I practice, and in which I feel comfortable trying to offer you assistance based on my knowledge of specific statutes in your state and/or general principles applicable in all states. It is always best, however, to work with attorneys and court personnel in your own area to deal with specific problems and factual situations.
I do not believe you have grounds for a lawsuit at this time since, among other things, you haven't suffered much harm, either economic or non-economic. If you report the conditions to OSHA and/or the Foxboro Board of Health and the employer retaliates against you and you can prove that the employer's action was in retaliation, you might have a basis for a lawsuit, in which the major element of damages would be your lost wages.
Consider also that even though you are not part of a union, you have the right under federal labor law to join with your co-workers to try to improve working conditions and the employer is not supposed to retaliate against you for doing so. If the conditions are as bad as you say, you probably are not the only person disgusted by them.
If you care whether or not you get fired, you may want to consult an employment lawyer before taking any of these actions, to weigh the probable outcomes.
Disclaimer: This site exists to provide information only. It is not legal advice. Answering your question does not create an attorney-client relationship. I am a Massachusetts lawyer. Any information provided on this site does not, except as explicitly stated, imply familiarity with laws or procedures peculiar to your state which may differ from those where I practice.