By Maria Armental 
 

ConocoPhillips (COP) and Phillips 66 (PSX) agreed to pay $11.5 million to settle accusations in California they failed to maintain properly underground gasoline-storage tanks, putting at risk nearby water supplies, the state attorney general said Thursday.

Under the terms of the settlement, the Houston companies, which didn't admit fault or guilt, agreed to pay a $9 million civil penalty, $1 million toward environmental projects in that state, and about $1.5 million in legal costs.

The final judgement was filed Wednesday in Alameda County Superior Court.

According to regulatory filings, Phillips 66, ConocoPhillips's former refining and marketing arm that was spun off in 2012, will recognize the settlement expenses.

The companies have since sold most of its interests in the underground storage-tank sites, according to the court documents.

In a complaint filed in 2013, the California authorities accused ConocoPhillips and Phillips 66 of violating antipollution state laws by, among other things, failing to properly maintain equipment to detect leaks and a working alarm system, inspect the tanks monthly and test secondary systems to contain potential leaks as well as failing to train employees appropriately.

The authorities found violations dating to 2006 in more than 560 gas stations in that state.

Write to Maria Armental at maria.armental@wsj.com

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