MENLO PARK, Calif. — Sacramento’s sanitation district may be forced by California to spend more than $2 billion to raise its wastewater purification standards to comply with more stringent environmental rules.

Officials at the Sacramento Regional County Sanitation District estimate the pollution-control project will require them to turn to the bond market for a portion of the funds and triple current residential ratepayer fees. The project, which is nearly four times larger than any previously undertaken by the district, comes as the area is dealing with falling home prices and historically high unemployment rates.

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