hr ▁rivers ▁in ▁Germany , ▁the ▁German ▁B ight ▁area ▁of ▁the ▁North ▁Sea ▁and ▁se w age ▁treatment ▁plant ▁out lets ▁in ▁Sweden . Section ▁ 3 . 1 . 2 . 4 , ▁European ▁Union ▁R isk ▁Ass ess ment ▁Report ▁( 2 0 0 5 ), ▁pp .   2 1 – 2 4 . ▁Typ ical ▁concentr ations ▁were ▁> 0 . 0 0 1   µ g / l ▁in ▁sea ▁water , ▁ 0 . 0 0 1 – 0 . 0 1   µ g / l ▁in ▁river ▁water ▁and ▁ 0 . 0 1 – 0 . 1   µ g / l ▁( s ometimes ▁higher ) ▁in ▁the ▁eff lu ent ▁from ▁se w age ▁treatment ▁plants . ▁ ▁These ▁find ings ▁indicate ▁that ▁mus k ▁x yl ene ▁is ▁not ▁completely ▁removed ▁from ▁waste water ▁by ▁the ▁se w age ▁treatment ▁process . ▁Two ▁studies ▁in ▁Germany ▁found ▁compared ▁mus k ▁x yl ene ▁concentr ations ▁in ▁incoming ▁waste water ▁and ▁se w age ▁treatment ▁plant ▁eff lu ent , ▁and ▁found ▁removal ▁rates ▁of ▁ 8 2 % ▁and ▁ 5 8 %. L ater ▁studies ▁have ▁found ▁higher ▁rates ▁of ▁removal ▁of ▁mus k ▁x yl ene ▁by ▁se w age ▁treatment ▁plants , ▁around ▁ 9 5 % : ▁European ▁Chem ical s ▁Agency ▁( 2 0 0 8 ). ▁However , ▁they ▁are ▁not ▁concentr ations ▁which ▁are ▁expected ▁to ▁be ▁to xic ▁to ▁aqu atic ▁life