AquaCompliance EU
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No. 17Priority Hazardous SubstanceuPBT

Hexachlorobutadiene

CAS: 87-68-3Category: IndustrialDirective: EU 2026/805 Annex VI
Compliance target22 December 2033

Environmental Quality Standards

Water EQS

Values in μg/L (micrograms per litre)

AA-EQS — Inland waters9.50e-4 μg/L
AA-EQS — Coastal & transitional9.50e-4 μg/L
MAC-EQS — Inland waters0.6 μg/L
MAC-EQS — Coastal & transitional0.06 μg/L

Biota / Sediment EQS

Matrix: biota

21 μg/kg ww

Monitoring guidance

  • ●uPBT — reduced monitoring frequency permitted (guideline: ≥ every 3 years)
  • ●Requires biota or sediment monitoring in addition to (or instead of) water measurements