Some Metrobus passengers will pay higher fares beginning Sunday, when a two-decade-old discount is discontinued on more than a dozen Anacostia bus routes.

Bus passengers on the affected routes who transfer to Metrorail at the Anacostia or Congress Heights stations, and who use SmarTrip, will see no change in their fares.

Bus-only riders, who are accustomed to paying $1 per trip, will now pay $1.50 (with a SmarTrip card) or $1.70 (cash).

District Department of Transportation spokesman John Lisle said the change restores the original intent of the Anacostia special fare.

The 50-cent discount was instituted when the Green Line opened in 1991. Bus routes that once traveled across the river and into downtown Washington now ended at the new Anacostia Metro station, and passengers accustomed to paying one bus fare had to pay an additional fee to ride the subway.

To defray costs for those passengers, the District subsidized cheaper bus fares for all riders east of the river. Technology at the time was not sophisticated enough to distinguish one kind of rider from another, said Lisle.

Tight budgets contributed to the decision to end the discount for bus-only riders, said Lisle. He said the change will save the District an estimated $800,000 each year.

According to Metro, the affected bus routes are 94, A2, A4, A5, A6, A7, A8, M8, M9, W2, W3, W6, W8 and routes 90, B2, P1, P2, P6 and U2 south of Good Hope Road.