PARSIPPANY -- The latest round of water testing at Parsippany public schools has found elevated lead levels at two more schools -- one of which had levels more than 100 times over the federal limit.

Elevated lead levels were found at Lake Hiawatha and Rockaway Meadow elementary schools following recent water testing, according to notices on the district website.

Ten of the 20 tested water sources at Lake Hiawatha Elementary School exceeded the federal action limit of 15 parts per billion -- the highest results of which were in three preschool classrooms, where the lead levels were 1,570, 1,040 and 262 parts per billion, and in two second-grade classrooms, with results of 963 and 664 parts per billion. Two Kindergarten classrooms, a first grade classroom, a staff room and a hallway drinking fountain also had elevated lead levels.

At Rockaway Meadow Elementary School, the room used for children with autism was the only one with lead levels exceeding the federal limit, at 23.2 parts per billion.

All impacted drinking fountains have been shut off and bottled water is being provided to students and staff, according to the district.

Last month, the Parsippany-Troy Hills School District reported the presence of lead in the water at five other schools: Parsippany High School, Parsippany Hills High School, Knollwood Elementary School, Central Middle School and Eastlake Elementary School.

Eastlake Elementary School had five water fountains with lead levels in excess of the federal limit of 15 parts per billion -- in Classrooms 5, 8, 14 and 16, and the water fountain between the hall and the gym. Classroom 14 had the highest level among all the schools at 270 parts per billion -- 18 times over the federal limit.

Testing at Knollwood Elementary School also found that water fountains in Classrooms 10, 12 and 15 had elevated lead levels of 25.1, 23.8 and 17 parts per billion, respectively.

Those drinking fountains at Eastlake and Knollwood schools with elevated lead levels have been shut off and bottle water will be provided to students in those classrooms. The district is currently evaluating its options to develop a long-term solution, according to the notice.

Lead levels were also found in the boiler rooms at Parsippany High School, Parsippany Hills High School and Knollwood Elementary School, and in the water pump room of Central Middle School but those areas are not tied into the drinking water of those respective schools.

No elevated lead levels were found in samples at Brooklawn Middle School.

Testing at Parsippany schools began after the disclosure that Newark schools have had elevated lead levels since at least 2012.

Earlier this week, Gov. Chris Christie announced the state would begin testing the water at New Jersey schools this year and that the state would adopt stricter guidelines with regard to lead testing for children.

According to the Centers for Disease Control and Prevention, there is no safe lead level in children. Even at low levels, lead has been shown to affect intelligence, the ability to pay attention and academic achievement. Lead exposure can be dangerous for adults as well.

For children up to the age of 5, experts use a reference level of 5 micrograms per deciliter of lead in blood to identify children with elevated blood lead levels. In the past, blood lead level tests used a higher threshold of 10 micrograms per deciliter to identify elevated levels, which is the standard New Jersey still uses.

The CDC advises that children with blood lead levels greater than or equal to 45 micrograms per deciliter of lead in blood receive chelation therapy -- a treatment that's used to remove heavy metals or minerals from the body.

More information is also available on the CDC's website.

Justin Zaremba may be reached at jzaremba@njadvancemedia.com. Follow him on Twitter @JustinZarembaNJ. Find NJ.com on Facebook.