There are good Hmong plumbers in large Hmong communities. You should try and get connected. I know PHers will only accuse me of bragging but I'm pretty lucky. Both clans of my husband and myself have professionals and/or married professionals in almost every necessary fields: family practice, dentistry, law, education, pharmacy, IT, engineering, real estate, finance, general contract, mechanic, chemist, nutritionist, nursing, restauranteur, fashion designers, buyers, accounting, agriculture, etc. you name it. Yes, we even have plumbers and electricians! There is always someone who knows something.