Substance	Cypermethrin
Reference Title	Proposed EQS for Water Framework Directive Annex VIII substances: cypermethrin
Medium / Matrix	WATER
Country	United Kingdom	County	not reported
Institution	Environment Agency
Status	Quality Criteria	Protected Asset	Aquatic life, fresh water
Use
Protection Level
Value
Designation Target LR Target UR Concentration Specification (Quality Target) PNEC 0.1  ng/l Target LR normalised Target UR normalised Concentration Specification (Quality Target) PNEC 0.0001  µg/l
Concentration Specification Monitoring
Remark	Long-term PNEC (proposed)
Derivation Base	..."The most sensitive and reliable long-term toxicity value for deriving an annual average quality standard in the combined data set is a NOEC of 0.1 ng l-1 for expression of milt by male Atlantic salmon. Since data are also available for algae and invertebrates and there are several mesocosm studies which suggest that effects on arthropod assemblages do not occur at or below 10 ng l-1, an assessment factor of 1 is recommended. PNECsaltwater_lt = 0.1 ng l-1 cypermethrin/AF (1) = 0.1 ng l-1 cypermethrin"
Derivation Method	AF=1