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About 100 L of formaldehyde, solution of formaldehyde gas, was leaked out during the plumbing repair of a logistics warehouse in the petrochemical plant in Hwaseong city at 10:00 a.m. 14th September 2015. Although the village was more than 1 km away from the plant, many fishes died because of the formaldehyde contamination. Local civil servants collected river water and some fishes 2 hours later for the analysis of formaldehyde. Water and fishes in the river were collected in front of the village. In the selected ion monitoring (SIM) of formaldehyde and 2,4-dinitrophenylhydrazine (DNPH) derivative of formaldehyde, SIM m/z parameters were 63, 79, 210 and quantification ion was m/z 210 for formaldehyde- 2,4-dinitrophenylhydrazone. The exposure allowance of formaldehyde by US health exposure limits (NOISH) is 2.5 mg/m3. The OSHA(Occupational Safety and Health Administtration) workplace permissible exposure limit by inhalation is 0.75 ppm as an eight hour time-weighted average. But our results showed 53.87 ppm (53.87 mg/L) in river water, the leak of formaldehyde in the plant elapsed over 2 hours though.Formaldehyde concentration was the highest in the fish intestine and followed by skin with scale, gill and flesh. Environmental status must be monitored till no harmful chemicals are detected.