Test all 1-6 year olds for lead exposure. There is no "safe" level
Ineffective hodge podge of requirements
Lead testing requirements for children in Ohio are a hodgepodge of disconnected requirements and services that aren't effectively monitored or enforced. If testing requirements were rigorously carried out under the current system, less than half of Ohio's children aged 1-6 would be tested for lead poisoning.
Here's some problems with the zip code approach: 1. Children don't live in cocoons, they visit friends, go to daycare and grandparent homes and play in backyards. 2. Zip codes are too big to pinpoint small clusters of risk.
September 20, 2016, Phys.Org Reliance on Zipcodes misled Flint lead policy makers "ZIP codes – the bane of my existence as a geographer. They confused my childhood friends into believing they lived in an entirely different city. They add cachet to parts of our communities (think 90210) while generating skepticism toward others relegated to less sexy ZIP codes. Dr. Tony Grubesic, an Arizona State University professor, has called them 'one of the quirkier 'geographies' in the world.' Dr. Nancy Krieger, a Harvard University professor, and colleagues have called out their unacceptability for small-area analyses."