A wood packaging producer becomes "ISPM 15 certified" by being authorized, directly or through an accredited agency, by its country's national plant protection organization (NPPO) to treat wood and apply the official ISPM 15 mark. Authorization requires a registered facility, a verified treatment process, documented quality control and recurring inspections; without it, a producer may not legally stamp the mark, even if the wood has been properly heat treated.
Who grants authorization
ISPM 15, the international standard adopted by the International Plant Protection Convention (IPPC) in March 2002 and substantially revised in 2009, places responsibility for the mark on each country's NPPO. The standard lists the NPPO's tasks as authorization, registration and accreditation of producers and treatment providers, monitoring of treatment and marking systems, and inspection, verification and auditing where appropriate. How a country organizes this varies: some NPPOs audit every facility themselves, while others delegate field inspection to accredited third parties under government oversight. The background to the standard is covered in ISPM 15 explained.
| Country / region | Responsible authority | Delivery model | Inspection rhythm |
|---|---|---|---|
| United States | USDA APHIS (NPPO) | American Lumber Standard Committee (ALSC) accredits independent inspection agencies, which audit facilities | Minimum 12 inspections per year, at roughly monthly intervals |
| United Kingdom | Forestry Commission (plant health for wood) | UK Wood Packaging Material Marking Programme (UKWPMMP) membership plus registration as a professional operator | Six-monthly facility assessments |
| European Union | Competent authority of each member state | Registered professional operators authorized under Regulation (EU) 2016/2031, Article 96 | Set nationally |
United States: the ALSC model
In the US, APHIS relies on the American Lumber Standard Committee to administer both the heat treatment (HT) and methyl bromide (MB) programs. ALSC does not inspect plants itself; it accredits independent third-party inspection agencies, and producers enroll with one of them. According to ALSC, 15 accredited agencies were operating in 2026, covering approximately 5,300 facilities. Under the ALSC enforcement regulations dated 7 November 2025, agencies must inspect each facility at least twelve times per year at approximately monthly intervals, keep inspection records for at least two years, and may warn, suspend or withdraw a facility's right to use the mark.
APHIS describes two routes to compliance under the HT program: buy lumber that has already been heat treated by an ALSC-accredited source, or build the packaging and heat treat the finished units to a minimum core temperature of 56 °C for at least 30 minutes. MB-treated packaging must be fumigated by fumigators certified in the program.
United Kingdom: UKWPMMP
UK producers apply for membership of the UK Wood Packaging Material Marking Programme and must also register with the Forestry Commission as a professional operator authorized to apply ISPM 15 marks. Members receive facility assessments every six months. The UK accepts heat treatment at 56 °C for 30 continuous minutes throughout the entire profile, or fumigation with methyl bromide or sulphuryl fluoride, always on debarked wood.
European Union
Within the EU, Regulation (EU) 2016/2031 on protective measures against plant pests requires that the mark be applied only by registered operators authorized by the competent authority of the member state (Article 96). The regulation has applied since 14 December 2019. Each member state runs its own application, audit and sanction procedures, so producers deal with their national plant health service.
Steps to authorization
Although the paperwork differs by country, the sequence is broadly the same everywhere:
- Choose the treatment route. Most producers use heat treatment; some buy pre-treated lumber and only assemble. The choice determines what equipment must be audited.
- Register with the NPPO or enroll with an accredited agency. The facility receives a unique producer or treatment-provider number, which appears in the mark after the two-letter ISO country code.
- Prepare a quality control manual. ALSC rules, for example, require a systematic method of record keeping and in-facility quality control procedures that demonstrate compliance and document wood sourcing.
- Install and verify treatment equipment. For heat treatment this means a kiln or chamber with core-temperature sensors and data recording (see below).
- Pass the initial inspection. Inspectors check the kiln, sensor placement, test runs, segregation of treated and untreated wood, debarking and the control of marking devices.
- Receive authorization to mark. Only then may the facility apply the ISPM 15 mark described in how to read the ISPM 15 mark.
- Maintain compliance. Ongoing audits, record reviews and corrective actions follow for as long as the facility marks packaging.
Kiln sensors and calibration
ISPM 15 recommends at least two temperature sensors suitable for measuring wood core temperature, and it requires that sensors and data recording equipment be calibrated according to the manufacturer's instructions at a frequency specified by the NPPO. National schemes turn this into concrete rules. The ALSC enforcement regulations, for instance, require thermocouples that accurately measure the temperature achieved, and equipment that varies by more than ±5 °F (about ±2.8 °C) must be recalibrated or replaced.
In practice, auditors look at where probes are inserted: in the thickest pieces, in the coldest zone of the chamber, and drilled to the core rather than resting on the surface. Treatment is complete only when every probe has shown at least 56 °C continuously for 30 minutes. Practical kiln management is covered in operating a heat treatment kiln.
Record keeping and traceability
ISPM 15 states that treatment providers keep records of heat treatments and calibrations for a period set by the NPPO. Typical records include:
- Kiln charge logs with date, load contents and probe positions
- Time–temperature printouts or electronic data for each cycle
- Sensor calibration certificates and check results
- Purchase documents for pre-treated lumber, including the supplier's mark details
- Stock of treated versus untreated material, kept physically separate
- Issue and control of marking devices (stamps, brands, ink-jet heads)
- Records of non-conformities and corrective actions
Good records protect the producer when an importing country challenges a shipment. If a consignment is rejected abroad, the NPPO traces the mark's producer number back to the facility and asks for evidence that the batch was treated. Consequences of failed inspections at destination are described in what happens when wood packaging fails inspection.
Repairs, remanufacturing and resale
Authorization also governs used packaging. ISPM 15 allows repaired units, where up to about one-third of the components are replaced, to keep their marks provided only treated wood or processed wood is used for the repair. Remanufactured units, with more than one-third replaced, must be re-treated and re-marked. The ALSC rules require old marks to be obliterated and new ones applied only after the packaging has been heat treated. Recyclers who want to mark pallets therefore need their own authorization; the details are in ISPM 15 rules for reused and repaired pallets.
Suspension and loss of authorization
Authorization is conditional. Common reasons for warnings or suspension include marking untreated stock, missing or falsified kiln data, uncalibrated probes, bark above the tolerance limit and loss of control over stamps. Under the ALSC regulations, an agency may warn, suspend or withdraw quality marks, and a facility suspended by one agency cannot simply switch to another: other agencies may not serve it for 180 days. The ALSC Board can in turn place an agency on probation or revoke its accreditation. Misuse of the mark can also be prosecuted; APHIS reports pursuing ISPM 15 fraud cases and levying fines.
Frequently asked questions
Can a company buy heat-treated lumber and mark its own pallets without a kiln?
In some schemes, yes. In the US, APHIS allows producers enrolled with an ALSC-accredited agency to build packaging from lumber already heat treated by an accredited source, but the facility must still be enrolled, inspected and able to document its wood sourcing.
Is an ISPM 15 authorization valid in other countries?
No. Authorization is issued by the producer's own NPPO and covers only that facility; the resulting mark, however, is accepted internationally because ISPM 15 asks importing NPPOs to accept it without further requirements.
Do ISPM 15 certified producers need to issue certificates with each shipment?
Generally not. ISPM 15 states that applying the mark makes a phytosanitary certificate unnecessary for the packaging itself, and the UK government confirms that compliant packaging needs no phytosanitary or treatment certificate.
How often are facilities inspected?
It depends on the scheme. ALSC-accredited agencies in the US inspect at least 12 times a year, while UK programme members are assessed every six months; EU frequencies are set by each member state.
Sources
- ISPM 15: Regulation of wood packaging material in international trade (2013 edition with 2017 annex) — IPPC / FAO
- Wood Packing Treatment Programs — USDA APHIS
- Wood Packaging Material Program — American Lumber Standard Committee
- WPM Enforcement Regulations (7 November 2025) — American Lumber Standard Committee
- Wood packaging material for import and export — UK Government / Forestry Commission
- Regulation (EU) 2016/2031 on protective measures against pests of plants — EUR-Lex
- Wood Packaging Material — USDA APHIS