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    The content on this page is for general educational purposes and does not constitute legal advice. Every legal situation is unique. For matters involving investigation, arrest, litigation, or formal proceedings, consult a qualified legal professional.

    Environmental Law
    serious offence

    Unlawful Pollution Discharge in Thailand

    Discharging waste, effluent or emissions in breach of environmental standards or without required treatment/permits.

    Last updated: February 2026
    Legal Sections

    Enhancement and Conservation of National Environmental Quality Act B.E. 2535 (1992), Factory Act B.E. 2535 (1992)

    Maximum Penalty

    Imprisonment and/or fines, clean-up and compensation liability, and factory-licence sanctions

    Severity Level

    serious

    Definition

    Discharging waste, effluent or emissions in breach of environmental standards or without required treatment/permits. Under Thai law, this offence is classified as a serious offence within the category of Environmental Law.

    Elements of the Offence

    For a conviction, the prosecution must prove all of the following elements beyond reasonable doubt:

    1

    Releasing pollutants to air, water or land

    2

    In breach of standards or without required permits/treatment

    Penalties

    Maximum Penalty

    Imprisonment and/or fines, clean-up and compensation liability, and factory-licence sanctions

    Actual sentences depend on factors including the severity of the conduct, harm caused, prior convictions, and mitigating circumstances. Courts have discretion to impose lesser sentences within the statutory range.

    Possible Defences

    The following defences may be available depending on the circumstances:

    Discharge within permitted limits

    Force majeure with prompt remediation

    Note: The availability of defences depends on specific facts. Professional legal advice is essential.

    For Foreigners

    Special Considerations for Foreign Nationals

    Applies to foreign-owned factories and projects; operators bear strict clean-up and compensation exposure.

    When Legal Representation Matters

    If you are accused of unlawful pollution discharge or facing investigation, immediate legal representation is essential to protect your rights and build an effective defence.

    Anglo Siam Legal provides experienced legal services across Thailand for both Thai nationals and foreigners.

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