Alhaji Mohammed Makera, Zonal Operation Controller of DPR in Sokoto, made this known to newsmen.
Makera said that the stations were engaged in selling petrol above the official price of N145 per litre, and for diversion.
Three independent filling stations were sealed in Sokoto and one station sealed in Kebbi.
Another filling station owned by a major marketer had since been reopened after a truck load of the product was retrieved.
Makera explained that the sale of the product at N145 per litre was being enforced in various stations in the two states by officials of DPR.
Officials of the department, he said, would sustain their 24 hours monitoring operations and enforcement in the two northwestern states to ensure that motorists were not cheated by marketers.
DPR had earlier sealed six major and independent defaulting filling stations in the two states, NAN reports.