ASEAN Water & Air Environmental Protection Domain

Industrial wastewater standards and water quality regulations in Thailand are strictly enforced by the Department of Industrial Works (DIW) and the Pollution Control Department (PCD) under the Factory Act and the Enhancement and Conservation of National Environmental Quality Act (NEQA). Following a 2020 notification amendment, the mandatory installation of Continuous Emission Monitoring Systems (CEMS) and the phased application of real-time automated water quality monitoring data reporting came into full operation for major industrial estates and designated establishments in Thailand. All manufacturing plants are required to strictly monitor effluent at discharge points for pH (5.5–9.0), BOD (20 mg/L or below), COD (120 mg/L or below), and heavy metals (lead, cadmium, copper, zinc, mercury, etc.), with strict environmental audits—including suspension orders and fines—applied in the event of non-compliance.

This is the basic environmental law (Law No. 32/2009) administered by the Ministry of Environment. It serves as the legal basis for Environmental Impact Assessment (AMDAL), environmental permits, industrial wastewater and air emission standards, and administrative sanctions.

This is the core pollution prevention law administered by the Department of Environment (DOE). It comprehensively regulates industrial effluent, air emissions, industrial waste, and noise, and operates a licensing system with strict legal penalties for non-compliant operators, alongside an EIA regime.

This is the basic air quality law (RA 8749) administered by the Department of Environment and Natural Resources (DENR). It regulates air pollutant emissions from stationary sources (such as boilers and manufacturing equipment) and mobile sources, and manages the Permit to Operate system.

This is the basic water quality law (RA 9275) administered by the Department of Environment and Natural Resources (DENR). It sets standards for the discharge of factory effluent into water bodies, operates the Discharge Permit system, and defines the required level of wastewater treatment for facilities.

This is the core industrial pollution prevention law overseen by the National Environment Agency (NEA). It strictly manages permits and limit values for stationary-source air pollutants (SOx/NOx) and industrial wastewater (BOD/COD standards) from factories and business premises.

This is the basic environmental law implemented in practice by the Pollution Control Department (PCD) under the Ministry of Natural Resources and Environment. It sets factory effluent standards, air emission limit values, and Environmental Impact Assessment (EIA) procedures, and conducts regular inspections and permit management for business establishments.

Under the Law on Environmental Protection (LEP 2020), administered by the Ministry of Agriculture and Environment, this comprehensively sets out requirements for manufacturing plants regarding wastewater and air emission management, obtaining environmental licences, and the installation and administrative connection obligations for automated online environmental monitoring equipment.