This year’s city tests show that reading and math achievement is on the rise in D.C. public charter schools.

The gains in the fast-growing charter sector were modest but notable in comparison to the mostly flat results for the school system. Results for the D.C. Comprehensive Assessment System in 2011 were released by the Office of the State Superintendent for Education.

On elementary reading tests, the pass rate for students in the independently operated public schools rose nearly 2 percentage points, to 46 percent. In elementary math, the rates rose nearly 3 points, to 46 percent.

In secondary reading, the charter school pass rate rose nearly 2 points, to 54 percent. In secondary math, the pass rate rose nearly 5 points, to 62 percent.

The Public Charter School Board, which oversees the sector, cheered the results.

“The board is pleased to see the continued progress among charter schools that administered the DC CAS,” said Darren Woodruff, a board member, in a statement. “While there is still more progress to be made, we are seeing higher levels of school-wide proficiency and continued progress moving students from below grade level toward grade-level proficiency.”