can you compost paint chips?
No — chips off anything painted before 1978 may be lead, and modern latex paint is a plastic film full of biocides.
which bins can take it?
- hot pile no
- cold pile no
- worm bin no
- bokashi no
- tumbler no
- curbside no
why?
Lead-based house paint stayed legal in the US until 1978, and old exterior coatings can run several percent lead by weight, which is why a toddler's mouthful of soil beneath peeling siding is a documented poisoning route. Newer paints swapped lead for acrylic polymer, titanium dioxide, and mildewcides — nothing a microbe wants to eat — so the film simply flakes into progressively smaller plastic confetti that a compost screen can't catch.
watch out for
- Scraping or sanding old paint spreads dust far past the work area. EPA's Renovation, Repair and Painting rule makes contractors contain it, and homeowners should copy the method: wet-scrape onto plastic sheeting, no power sanding.
- Soil right along a painted foundation or fence line is where lead accumulates — grow food in raised beds a few feet out, not in that strip.
what to do instead
Catch chips on plastic sheeting, roll it up, and bag it for the trash following your state's rule for lead-paint debris; small homeowner quantities are usually allowed. Leftover liquid paint is a different matter and goes to a household-hazardous-waste day or a paint-stewardship drop-off.
often confused with
- Painted Wood — Same hazard, bigger pieces — a painted board is easier to contain than loose chips scattered through the soil under it.
quick answers
How do I find out if old paint has lead in it?
Hardware-store swab kits using rhodizonate give a fast yes/no on a fresh cut through every layer, and certified inspectors use handheld XRF for a real answer. Some state health departments will also test a soil sample cheaply.
Latex paint is water-based — doesn't that make dried chips harmless?
Water is only the carrier that evaporates. What stays behind is acrylic or vinyl polymer, pigment, and fungicide, which is plastic by any practical definition and behaves like it in soil.