If it's the city health department, then it's probably a matter of some lead paint ordinance you're (accidentally) violating. Was your house built before 1980?

If it's the city health department, then it's probably a matter of some lead paint ordinance you're (accidentally) violating. Was your house built before 1980? If it's lead paint issue, then probably the paint is flaking off somewhere in copious amounts. Or it was flaking off, and it was improperly encapsulated (ie, wasn't adequately scraped off, and/or the paint you used to cover it up wasn't approved for that purpose by your jurisdiction). Assuming this is the issue, were you able to reach all the painted areas of your home that are flaking? Have you read your city's lead paint ordinances and/or health department guides to find out how to properly remediate/encapsulate lead paint? This could help you discover what you did wrong, if anything. By the way, whatever you do, never sand or heat lead paint, or scrape it without wetting it first with water and wearing a proper respirator. And never do any lead paint work with young children anywhere nearby (they're very susceptible to lead paint poisoning). source: worked as a house painter back in college. (None of my comments are medical, legal, or professional advice, obviously)