Worrying worm-like creatures have been reported coming from taps – weeks after complaints about “weird-looking organisms” appearing in their drinking water.
South Korea residents made the discovery in Incheon, west of the capital, earlier this month.
Seoul, Busan, Gyeonggi Province and Hwaseong were a number of places to also file reports.
Officials have received nearly 600 complaints of larva-like creatures being found.
Concerned Prime Minister Chung Sye-kyun has issued an emergency instruction on Monday for inspection of all water purification plants.
Minister of Environment Cho Myung-rae has promised to be as open as possible with the findings.
“The environment ministry and local governments should join hands to swiftly conduct investigations and transparently disclose all relevant information to help ease public unrest,” Chung told media outlet Cho.
“The Prime Minister also ordered an emergency inspection of all 484 water purification plants nationwide to cope with the problem.”
They believe is was unlikely the worm-like creatures came in through water pipes.
“A microscopic observation of water samples conducted by the Seoul Water Institute showed that no debris or larva were found,” the city government said.
They also appeared to rule out the possibility of them originating from water purification plants
Authorities last week completed inspections of six facilities and also 101 water reservoirs in the city.
In Busan, municipal officials said they have received 11 complaints of organisms.
Siheung reported 14 cases, with Hwaseong having 12. Bucheon, just west of Seoul, confirmed 10 cases.