Only Severn Trent and Wessex Water achieved the highest level of performance, with 4 star ratings from the EA. In 2019, there were 52 category 1 events  the most serious  compared with 56 in 2018, and 48 serious pollution incidents took place at sewerage facilities, more than half of which were from Anglian and Thames Water assets. The EA has been investigating Southern Water over serious failures in the operation of its sewage treatment sites. Southern Water was responsible for 458 pollution incidents, nearly double its 2018 total. The EA performance assessment published on Friday revealed there were 2,204 pollution events last year  the highest number since 2014  marking the worst record for environmental pollution from the water industry for five years.
Only Severn Trent and Wessex Water achieved the highest level of performance, with 4 star rankings across from the initiative.
( z0 achieve :ARG0 ( z1 and :mod ( z2 only ) :op ( z3 company :name ( z4 name :op "Severn" :op "Trent" ) ) :op ( z5 company :name ( z6 name :op "Wessex" :op "Water" ) ) ) :ARG1 ( z7 level :ARG1-of ( z8 have-degree :ARG2 ( z9 high :ARG1 z7 ) :ARG3 ( z10 most ) ) :mod ( z11 perform ) ) :manner ( z12 rank :ARG1 ( z13 star :quant 4 ) :location ( z14 across :source ( z15 initiative ) ) ) )
(z0 / achieve-01
    :ARG0 (z1 / and
              :mod (z2 / only)
              :op1 (z3 / company
                       :name (z4 / name
                                 :op1 "Severn"
                                 :op2 "Trent"))
              :op2 (z5 / company
                       :name (z6 / name
                                 :op1 "Wessex"
                                 :op2 "Water")))
    :ARG1 (z7 / level
              :ARG1-of (z8 / have-degree-91
                           :ARG2 (z9 / high-02
                                     :ARG1 z7)
                           :ARG3 (z10 / most))
              :mod (z11 / perform-02))
    :manner (z12 / rank-01
                 :ARG1 (z13 / star
                            :quant 4)
                 :location (z14 / across
                                :source (z15 / initiative))))
Only Severn Trent and Wessex Water achieved the highest level of performance , with 4 star rankings across from the initiative .
z4 :op1 1
z4 :op2 2
z1 :mod z2
z1 :op1 z3
z3 :name z4
z1 :op2 z5
z5 :name z6
z6 :op1 4
z6 :op2 3
z0 :ARG0 z1
z8 :ARG2 z9
z8 :ARG3 z10
z9 :ARG1 z7
z7 :ARG1-of z8
z0 :ARG1 z7
z7 :mod z11
z13 :quant 0
z12 :ARG1 z13
z0 :manner z12
z12 :location z14
z14 :source z15