Lead safety · Indoor air · Industrial hygiene — for inspectors, homeowners & professionals · Published by Lab Street
Lead professionals who've listed their business with The Lead Ledger. Call to confirm services, certifications and availability.
Put your firm in front of homeowners, landlords and property managers. Your listing goes live immediately. No cost, no catch.
Lead regulation is a layer cake of federal, state and city rules. Here are the ones that shape daily life for property owners and professionals — in plain English.
Residential paint with more than 0.06% lead was banned February 27, 1978. Everything built before then is legally presumed to contain lead-based paint until an inspection proves otherwise.
Every sale or lease of pre-1978 housing requires disclosure of known lead hazards, delivery of the EPA pamphlet, and — for buyers — a 10-day window to test. Don't waive it.
Contractors disturbing paint in pre-1978 homes must be EPA-certified, use lead-safe work practices, and document them. Triggers at just 6 ft² of interior paint disturbance or any window replacement.
The numbers that define "hazard" and "clean": floors 10 µg/ft², window sills 100 µg/ft², troughs 400 µg/ft² (clearance). Measured only by dust wipe sampling with laboratory analysis.
Pre-1978 rentals in Philadelphia must be certified lead-safe (visual + passing dust wipes, renewed every 4 years) or lead-free to hold a rental license and lawfully collect rent.
For workers: permissible exposure limit of 50 µg/m³ (8-hour average), action level 30, with mandatory monitoring, hygiene facilities, and medical surveillance on lead jobs.
Many states run their own certification programs and stricter rules — New Jersey's periodic rental inspections and Maryland's registration regime among them. Always check the local layer.
Want the deep dives? The Lead Laws articles in our blog unpack each of these.
This page is general information, not legal advice.
Humanity has been mining, using — and being poisoned by — lead for five thousand years. The arc from Roman wine pots to modern dust wipe standards is one of the great slow-motion stories in public health.
Lead smelting begins; the metal's low melting point and malleability make it an ancient favorite.
Rome mines ~80,000 tons a year — pipes, cookware, and lead-sweetened wine. Vitruvius notes lead workers' pallor and recommends clay pipes.
Australian physicians link childhood poisoning to house paint; France, Belgium and Austria ban interior white lead by 1909.
Tetraethyl lead invented to stop engine knock — beginning a half-century of leaded gasoline.
Baltimore becomes the first U.S. city to ban lead house paint — 27 years ahead of the nation.
Herbert Needleman's research shows cognitive harm at "silent" exposure levels; the EPA is born; catalytic converters force unleaded fuel.
CPSC bans residential lead paint nationwide. ~31 million U.S. homes still contain the legacy.
Leaded gasoline fully banned for U.S. road vehicles; average blood lead levels plummet in one of public health's clearest victories.
Algeria — the last country on Earth — ends leaded gasoline. EPA tightens dust-lead standards toward today's 10 µg/ft² floors.
The frontier is measurement: no known safe level, single-digit standards, and accredited laboratories as the referee.
For the full stories — Rome, the white lead wars, the gasoline detour — browse the History of Lead articles.
Lab Street LLC is an ISO/IEC 17025 accredited, EPA NLLAP-recognized lead testing laboratory in Narberth, Pennsylvania — minutes from Center City Philadelphia and serving inspectors nationwide.
Editor's note: The Lead Ledger is published by Lab Street — so yes, we're partial. We think you will be too.