MINNEAPOLIS — The Minnesota Pollution Control Agency said Wednesday that more data analysis must be done to determine whether it will recommend changes to the state’s water quality standards to protect wild rice from sulfates.

A preliminary analysis of a two-year study on the issue makes no recommendations for changes to the standard for sulfate discharges at this time but says site-specific standards might be needed for some waters. The analysis also suggests the current standard is within a range suitable for protecting wild rice.