To make supplemental appropriations for fiscal year 1999 to ensure the inclusion of commonly used pesticides in State source water assessment programs, and for other purposes.

Makes supplemental appropriations for FY 1999 for the Environmental Protection Agency for grants for the drinking water State revolving funds under the Safe Drinking Water Act for State expenses of formulating source water assessment programs. Requires such programs to include the assessment of: (1) the pesticides chlorothalonil, pendimethalin, paraquat, cyanazine, bensulide, chlorpyrifos, diazinon, metalaxyl, and mecoprop; (2) surface water sources; (3) residential drinking wells; and (4) contaminated soil.