WASHINGTON (AP) - An EPA official says there's a "distinct possibility" the agency won't take action to limit a toxic rocket fuel ingredient that has contaminated drinking water supplies around the country.

Benjamin Grumbles, assistant administrator for water at the Environmental Protection Agency, told senators Tuesday that EPA believes the contaminant - perchlorate - poses developmental health risks. But he says that after years of study EPA has not determined whether regulating perchlorate would meaningfully reduce that risk.

Senators accused EPA of foot-dragging. The agency has faced pressure from the Pentagon, which could be liable for clean-up costs.

Perchlorate has been found in at least 35 states and is widespread in the Southwest.

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