"The threshold level ... is essentially the level at which protective actions would be triggered by doctors, health departments and parents," the letter stated.
Even small amounts of lead exposure can lead to serious health issues, including irreversible brain damage, according to the Mayo Clinic.
The CDC's budget for its lead prevention program was cut from $29 million to $2 million for this fiscal year.
The program funded efforts in 34 states and the District of Columbia to "monitor blood lead screening and respond to every child who has an elevated blood lead level" with home inspections and medical treatment, according to the Coalition to End Childhood Lead Poisoning, an advocacy group.
The Democrats who wrote to the CDC were: Reps. Edward MarkeyEd MarkeyThe Hill’s Whip List: Where Dems stand on Trump’s Supreme Court nominee Overnight Regulation: Senate moves to strike Obama-era internet privacy rules Overnight Tech: Senate votes to eliminate Obama internet privacy rules | FCC chief wants to stay out of 'political debate' on fake news | Wikileaks reveals new CIA docs MORE (Mass.), Henry Waxman (Calif.), Louise Slaughter (N.Y.), Elijah Cummings (Md.), Barney Frank (Mass.), Bobby Rush (Ill.), G.K. ButterfieldG.K. ButterfieldFCC defends not fighting legal challenge to prison call rates A guide to the committees: House 40 House Dems to urge Trump to suspend Flynn MORE (N.C.), Jim MoranJim MoranFormer reps: Increase support to Ukraine to deter Russia GOP Rep. Comstock holds on to Virginia House seat 10 races Democrats must win to take the House MORE (Va.), Anna Eshoo (Calif.), John Lewis (Ga.), Eliot Engel (N.Y.), Jackie Speier (Calif.), Jerrold Nadler (N.Y.), Raul Grijalva (Ariz.), Richard Neal (Mass.), Grace Napolitano (Calif.), Dennis Kucinich (Ohio), Stephen Lynch (Mass.), Jim McGovern (Mass.), Russ Carnahan (Mo.), Charles Rangel (N.Y.), Lois Capps (Calif.), Niki Tsongas (Mass.), Jan Schakowsky (Ill.), Doris Matsui (Calif.), Betty McCollum (Minn.) and Steve Rothman (N.J.).
Dems: GOP budget puts kids at risk on lead poisoning
By Elise Viebeck - 05/14/12 05:08 PM EDT