Background
On March 30, 2026, the Ministry of Environment dispatched a team of specialists to investigate reports of mass fish deaths in Prek Tnaot stream in Dangkor district, Phnom Penh. The deployment followed reports from residents that large numbers of dead fish had been observed in the waterway that afternoon.
According to the ministry, experts conducted on-site inspections and collected water samples for laboratory testing to determine the cause. As of 6:30 p.m. on the same day, the team was examining areas approximately 6 kilometers downstream from the reported site, with upstream inspections scheduled for the following day.
Scope of Application
The reported action concerns investigation and response measures related to suspected water pollution affecting a public water body. The ministry stated that its environmental enforcement framework applies to pollution in public waterways and to factories or businesses found discharging untreated wastewater.
The ministry also referred to Circular No. 03, dated March 12, 2025, which was issued to strengthen cooperation among institutions to reduce pollution in public water bodies and protect public health and biodiversity.
Key Provisions or Decisions
Environment Minister Eang Sophalleth instructed authorities to identify the source of possible water pollution in Prek Tnaot stream. The ministry stated that specialists were carrying out field inspections and laboratory sampling as part of the inquiry.
The ministry further stated that it continues to enforce measures under its environmental strategy for 2023–2028 to prevent public water pollution. In its statement, the ministry said these measures include penalties and possible suspension of operations for factories or businesses found discharging untreated wastewater.
Implications for Investors, Businesses, or Compliance
The case indicates continued environmental monitoring of public waterways and the use of investigative procedures where pollution is suspected. Businesses whose operations affect water discharge, particularly factories and other wastewater-generating facilities, may face scrutiny if linked to untreated wastewater entering public water bodies.
The ministry’s reference to Circular No. 03 and to enforcement measures under the 2023–2028 environmental strategy signals that water pollution control remains an active compliance issue for operators whose activities may affect environmental quality.
Official Source
Ministry of Environment statement published on March 31, 2026, regarding the investigation into suspected fish deaths in Prek Tnaot stream, Dangkor district, Phnom Penh.
