The department said between 200-240 cubic metres of sewage is being dumped into public water sources every day.
The city has about 125-150 tankers collecting toilet waste in thecity. However, only Hoa Binh Waste Processing Ltd Co in Binh Chanhdistrict is able to treat sewage.
Le Tien Dung, thecompany's director, said the firm in 2008 invested 13 billion VND(685,000 USD) in building a waste-treatment facility that could handle300 cubic metres of sewage a day. However, the plant typically receivesjust 25-30 cubic metres of waste daily, Dung said.
Instead of transporting the waste to the plant, drivers have beenpouring it into canals and rivers, which are now badly polluted andposing a threat to residents' health.
Just lastweek, the city's environmental police found a tanker illegally dumpingtoilet waste into the waterway near Tan Phu Trung Industrial Zone in CuChi district.
Police said tankers could completely empty their loads in just three to four minutes, making detection difficult.
The Department of Natural Resources and Environment said electronicchips would be fitted to tankers so that their movements could bemonitored.
Nguyen Trung Viet, the department's solidwaste division chairman, said chips would be fitted to all tankers byearly next year./.