Annual average, highest and lowest mean concentrations of orthophosphates by region: 1980 to 2013, Great Britain
Updated 15 October 2014
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Annual Average, highest and lowest mean concentrations - 1980-2013 | |||||||||||||||||||||||||||||||||||
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Orthophosphate - mg/l | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set |
Region | Not set | 1980 | 1981 | 1982 | 1983 | 1984 | 1985 | 1986 | 1987 | 1988 | 1989 | 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 |
North West | Mean | 0.533929335 | 0.497915406 | 0.593582144 | 0.646517124 | 0.788270646 | 0.678467063 | 0.689482311 | 0.620229724 | 0.662330856 | 0.884237133 | 0.780306909 | 0.807275378 | 0.552269524 | 0.611300052 | 0.580122756 | 0.905492054 | 1.028980694 | 1.005288824 | 0.724197776 | 0.895218425 | 0.736789983 | 0.85212322 | 0.628848976 | 0.645592466 | 0.455844333 | 0.448300638 | 0.52473812 | 0.326507804 | 0.227917043 | 0.275892291 | 0.308650903 | 0.310779854 | 0.196231329 | 0.285953669 |
North West | Max | 3.614285714 | 2.790465116 | 3.168888889 | 3.671428571 | 3.464285714 | 3.46027027 | 4.044827586 | 3.0272 | 3.58826087 | 4.329361702 | 5.07755102 | 4.506034483 | 2.650283019 | 3.076740741 | 2.281553191 | 3.172863636 | 3.768021277 | 3.059736842 | 2.76428 | 3.322181818 | 2.1049 | 2.346977273 | 1.654625 | 2.593083333 | 1.729181818 | 2.213 | 5.099384615 | 1.352 | 0.9945 | 1.308166667 | 1.32625 | 1.229833333 | 0.834833333 | 1.190333333 |
North West | Min | 0.012375 | 0.019166667 | 0.030833333 | 0.025384615 | 0.021923077 | 0.023461538 | 0.02375 | 0.022222222 | 0.018571429 | 0.006428571 | 0.00828125 | 0.007631579 | 0.005714286 | 0.009642857 | 0.025 | 0.025 | 0.025 | 0.027333333 | 0.032166667 | 0.064 | 0.031833333 | 0.055 | 0.034769231 | 0.004146667 | 0.005905833 | 0.008473333 | 0.009833333 | 0.007176923 | 0.007430769 | 0.009541667 | 0.01 | 0.01 | 0.01 | 0.01 |
North East | Mean | 0.289434217 | 0.361633189 | 0.419545173 | 0.517018223 | 0.540167556 | 0.52332236 | 0.441717905 | 0.443608125 | 0.48098608 | 0.744257262 | 0.578283983 | 0.534974234 | 0.461737901 | 0.338262804 | 0.368854249 | 0.56290923 | 0.65111708 | 0.579422421 | 0.639658091 | 0.5794447 | 0.408717422 | 0.467674319 | 0.343532527 | 0.394750127 | 0.298176435 | 0.345088629 | 0.476299944 | 0.290934684 | 0.239358113 | 0.238163323 | 0.270728261 | 0.359488065 | 0.214587879 | 0.257252508 |
North East | Max | 1.180208333 | 1.386666667 | 1.635 | 2.089230769 | 1.974358974 | 2.296666667 | 1.377173913 | 1.545652174 | 2.245454545 | 2.917291667 | 2.550238095 | 2.130609756 | 2.0524 | 1.367 | 1.621 | 2.485 | 3.16212766 | 2.509807692 | 2.125777778 | 1.903638889 | 1.791314286 | 2.226571429 | 1.361083333 | 1.655166667 | 1.4255 | 1.676833333 | 4.160538462 | 1.224833333 | 1.231833333 | 1.08 | 1.58075 | 1.88825 | 1.087181818 | 1.180769231 |
North East | Min | 0.012782609 | 0.014210526 | 0.008571429 | 0.02625 | 0.01125 | 0.03 | 0.02 | 0.00875 | 0.01 | 0.005 | 0.033043478 | 0.023658537 | 0.023181818 | 0.007083333 | 0.0123 | 0.015 | 0.0125 | 0.019166667 | 0.0375 | 0.029583333 | 0.023181818 | 0.022 | 0.038307692 | 0.01225 | 0.01 | 0.011 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 |
Midlands | Mean | 1.088451856 | 1.061869027 | 1.332924174 | 1.418880399 | 1.611836476 | 1.406932885 | 1.430880216 | 1.277995348 | 1.458032901 | 1.746606522 | 1.719942227 | 1.471084738 | 1.163707218 | 1.034560347 | 0.976598881 | 1.34296566 | 1.629830553 | 1.577611347 | 1.215238404 | 1.032730347 | 0.937236444 | 0.963491194 | 0.781057664 | 0.872818449 | 0.769189453 | 0.762377935 | 0.629443265 | 0.559749456 | 0.504690437 | 0.463601243 | 0.449853333 | 0.544366667 | 0.371913152 | 0.313877976 |
Midlands | Max | 2.993157895 | 3.013636364 | 3.182916667 | 3.51875 | 3.720833333 | 3.923076923 | 3.777692308 | 3.62 | 4.45425 | 5.063589744 | 3.926875 | 3.771785714 | 3.301555556 | 2.934545455 | 2.982666667 | 3.6725 | 4.598333333 | 4.561666667 | 4.132727273 | 3.53 | 2.931428571 | 2.754166667 | 2.511363636 | 2.732727273 | 2.794166667 | 2.304384615 | 2.464375 | 2.223066667 | 1.955461538 | 1.201416667 | 1.251916667 | 1.766833333 | 1.223846154 | 0.92825 |
Midlands | Min | 0.071190476 | 0.045555556 | 0.058863636 | 0.033870968 | 0.054772727 | 0.097368421 | 0.026 | 0.086388889 | 0.0425 | 0.025 | 0.025 | 0.033653846 | 0.026061224 | 0.021 | 0.049333333 | 0.014833333 | 0.011125 | 0.016933333 | 0.016416667 | 0.098 | 0.019153846 | 0.021888889 | 0.01365 | 0.010222222 | 0.0162 | 0.022333333 | 0.025727273 | 0.05274 | 0.049916667 | 0.052583333 | 0.01 | 0.01 | 0.020083333 | 0.012916667 |
Anglian | Mean | 0.674006267 | 0.734448775 | 0.716685357 | 0.854633129 | 0.888255912 | 0.979921641 | 0.942753632 | 0.783344287 | 0.533083349 | 1.156328773 | 1.197120593 | 1.11908824 | 0.706013228 | 0.581508782 | 0.530224073 | 0.67750248 | 0.849316517 | 0.91059155 | 0.681985732 | 0.463624278 | 0.031818182 | 0.31997619 | 0.446734102 | 0.430301299 | 0.356524511 | 0.279815553 | 0.24337642 | 0.222546875 | 0.210070313 | 0.188556132 | 0.167951821 | 0.199922568 | 0.187004228 | 0.160789243 |
Anglian | Max | 1.700777778 | 1.993362069 | 1.819903846 | 1.763461538 | 2.176538462 | 2.475555556 | 1.898205128 | 1.95 | 1.248947368 | 2.072645161 | 2.5665 | 1.824183333 | 1.08105 | 1.859854167 | 1.421428571 | 1.304166667 | 1.6005 | 2.053666667 | 1.4175 | 1.601869565 | 0.031818182 | 0.793333333 | 1.709545455 | 0.983833333 | 1.395916667 | 0.62525 | 0.573 | 0.548083333 | 0.448583333 | 0.438 | 0.388083333 | 0.53725 | 0.488416667 | 0.45975 |
Anglian | Min | 0.093571429 | 0.12047619 | 0.135 | 0.108888889 | 0.128818182 | 0.258571429 | 0.287222222 | 0.097727273 | 0.094190476 | 0.108588235 | 0.086840909 | 0.054 | 0.027583333 | 0.031510417 | 0.065520833 | 0.041170213 | 0.036770833 | 0.0421875 | 0.068229167 | 0.072791667 | 0.031818182 | 0.044714286 | 0.044142857 | 0.030909091 | 0.034583333 | 0.031916667 | 0.024416667 | 0.042583333 | 0.035958333 | 0.030108333 | 0.031833333 | 0.031333333 | 0.030333333 | 0.032 |
South East | Mean | 0.991913264 | 0.955104163 | 1.058636734 | 1.311029368 | 1.300781779 | 1.245986621 | 1.191278811 | 1.154964886 | 1.24817642 | 1.830148186 | 1.721058928 | 1.409706018 | 1.19577594 | 0.856870467 | 0.81679338 | 1.13205848 | 1.359999478 | 1.452344058 | 1.03001803 | 0.953260893 | 0.725778604 | 0.604096211 | 0.552511675 | 0.656613518 | 0.591660697 | 0.581269868 | 0.437628272 | 0.386591127 | 0.307068787 | 0.359612179 | 0.29455646 | 0.395432094 | 0.266422121 | 0.243516501 |
South East | Max | 3.553333333 | 2.448 | 3.424545455 | 4.75 | 3.761034483 | 4.1935 | 3.009090909 | 4.183684211 | 4.170555556 | 5.509142857 | 4.655833333 | 3.8556 | 3.352692308 | 2.500769231 | 2.621666667 | 2.574166667 | 3.808333333 | 4.110833333 | 2.838333333 | 3.648333333 | 2.346666667 | 2.082666667 | 1.79 | 2.1291 | 2.10475 | 2.631666667 | 2.059333333 | 2.371 | 1.681083333 | 2.122916667 | 1.884166667 | 2.267166667 | 1.19725 | 0.577166667 |
South East | Min | 0.070740741 | 0.140636364 | 0.139166667 | 0.129543478 | 0.151257143 | 0.174617647 | 0.165628571 | 0.160548387 | 0.201290323 | 0.24375 | 0.169512195 | 0.154571429 | 0.157 | 0.115089286 | 0.122946429 | 0.10537037 | 0.121346154 | 0.1243 | 0.1 | 0.096166667 | 0.087416667 | 0.085333333 | 0.087916667 | 0.072083333 | 0.084416667 | 0.065666667 | 0.056153846 | 0.056583333 | 0.058833333 | 0.043833333 | 0.041583333 | 0.040833333 | 0.04375 | 0.040230769 |
South West | Mean | 0.210744337 | 0.205165188 | 0.206912844 | 0.238355086 | 0.35232299 | 0.275020665 | 0.230548429 | 0.307269964 | 0.251260319 | 0.360565055 | 0.319809309 | 0.216034073 | 0.229363088 | 0.201391187 | 0.187193871 | 0.238088136 | 0.266788741 | 0.239558766 | 0.201436311 | 0.164975175 | 0.188506382 | 0.247013974 | 0.210689242 | 0.250529833 | 0.192589046 | 0.187258081 | 0.162168788 | 0.125311064 | 0.101103741 | 0.133716667 | 0.128245012 | 0.160904658 | 0.091663184 | 0.128264782 |
South West | Max | 1.235 | 1.115 | 0.938333333 | 0.953 | 1.734 | 1.28625 | 1.040909091 | 1.615 | 0.874583333 | 1.5052 | 1.761304348 | 0.929075 | 0.826333333 | 0.781428571 | 0.688571429 | 1.046923077 | 1.107272727 | 0.920923077 | 0.685636364 | 0.7271 | 0.64725 | 0.9857 | 1.0395 | 1.422545455 | 0.824272727 | 0.775 | 0.693666667 | 0.5238 | 0.501583333 | 0.578 | 0.7432 | 0.9893 | 0.383714286 | 0.630076923 |
South West | Min | 0.01536 | 0.020333333 | 0.011166667 | 0.014047619 | 0.010652174 | 0.020208333 | 0.014130435 | 0.019375 | 0.018913043 | 0.023636364 | 0.0184 | 0.022115385 | 0.0125 | 0.0186 | 0.012692308 | 0.012222222 | 0.010961538 | 0.0111875 | 0.015583333 | 0.011065625 | 0.009833333 | 0.014666667 | 0.0112 | 0.0125 | 0.01325 | 0.011833333 | 0.01 | 0.01175 | 0.01 | 0.01 | 0.010916667 | 0.01 | 0.01 | 0.01 |
Wales | Mean | 0.132247351 | 0.104739624 | 0.121666522 | 0.127919339 | 0.170434471 | 0.140100665 | 0.128702491 | 0.130946903 | 0.131375404 | 0.20257929 | 0.184065807 | 0.140101878 | 0.105188145 | 0.073471952 | 0.061433812 | 0.072846163 | 0.082802782 | 0.078279415 | 0.055367858 | 0.065969183 | 0.040647684 | 0.050298102 | 0.047077568 | 0.049721982 | 0.041955849 | 0.046661475 | 0.051924354 | 0.042080926 | 0.043291021 | 0.043252674 | 0.051414897 | 0.058598819 | 0.033462712 | 0.033324262 |
Wales | Max | 1.02755814 | 1.0102 | 0.949767442 | 1.301666667 | 1.344333333 | 1.094583333 | 1.244782609 | 1.272 | 1.225833333 | 1.36 | 2.172727273 | 1.830909091 | 0.931875 | 0.500176471 | 0.559928571 | 0.656916667 | 0.874166667 | 0.768066667 | 0.62825 | 0.735666667 | 0.383666667 | 0.405416667 | 0.3445 | 0.440307692 | 0.414 | 0.381 | 0.485916667 | 0.303166667 | 0.417 | 0.433166667 | 0.602 | 0.788166667 | 0.33475 | 0.186916667 |
Wales | Min | 0.011428571 | 0.007307692 | 0.009722222 | 0.01 | 0.011428571 | 0.012 | 0.011666667 | 0.0175 | 0.01 | 0.0025 | 0.013181818 | 0.011136364 | 0.01 | 0.010625 | 0.01 | 0.006291667 | 0.001384615 | 0.001333333 | 0.00175 | 0.00375 | 0.002 | 0.004 | 0.002583333 | 0.003583333 | 0.004333333 | 0.00925 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.005636364 | 0.003856667 |
SEPA North | Mean | 0.020548343 | 0.022554186 | 0.032331699 | 0.022734403 | 0.019259722 | 0.016045614 | 0.025576492 | 0.025450441 | 0.020732214 | 0.031840463 | 0.023836898 | 0.022321322 | 0.019797971 | 0.022814617 | 0.015825627 | 0.018439139 | 0.023980838 | 0.021983333 | 0.018109655 | 0.016720265 | 0.018050149 | 0.017530568 | 0.015545885 | 0.021692374 | 0.026081506 | 0.025690918 | 0.026942905 | 0.022460954 | 0.024433993 | 0.024856605 | 0.019138956 | 0.01938917 | 0.010931511 | 0.009988963 |
SEPA North | Max | 0.07825 | 0.118 | 0.148 | 0.076666667 | 0.0895 | 0.054625 | 0.108571429 | 0.148888889 | 0.1041 | 0.2258 | 0.12425 | 0.111166667 | 0.096923077 | 0.070666667 | 0.100636364 | 0.103416667 | 0.125 | 0.117083333 | 0.073846154 | 0.077272727 | 0.082583333 | 0.067833333 | 0.061818182 | 0.0792 | 0.0777 | 0.0638 | 0.082538462 | 0.070538462 | 0.094454545 | 0.064818182 | 0.060916667 | 0.066857143 | 0.036727273 | 0.027818182 |
SEPA North | Min | 0.001125 | 0.001208333 | 0.0016 | 0.001416667 | 0.00175 | 0.001416667 | 0.00225 | 0.002416667 | 0.002272727 | 0.002 | 0.0025 | 0.002166667 | 0.002083333 | 0.002833333 | 0 | 0.002333333 | 0.002416667 | 0.002416667 | 0.002433333 | 0.0021 | 0.0021 | 0.0021 | 0.002485 | 0.004545455 | 0.005416667 | 0.004909091 | 0.008916667 | 0.00525 | 0.0052 | 0.005714286 | 0.0045 | 0.004555556 | 0.004416667 | 0.0045 |
SEPA East | Mean | 0.147388266 | 0.148023787 | 0.135602554 | 0.17202881 | 0.220732359 | 0.149727778 | 0.144626613 | 0.126918741 | 0.131915391 | 0.207157146 | 0.156172096 | 0.157404829 | 0.131538095 | 0.109634911 | 0.147253389 | 0.156371013 | 0.210006242 | 0.211424916 | 0.145656126 | 0.113607026 | 0.104100033 | 0.095867341 | 0.05774222 | 0.079425283 | 0.057473702 | 0.065249437 | 0.061163513 | 0.060083523 | 0.055420644 | 0.049216667 | 0.05034967 | 0.039858139 | 0.035043982 | 0.041291339 |
SEPA East | Max | 0.703636364 | 0.643076923 | 0.6925 | 0.924166667 | 1.320833333 | 0.7325 | 0.619090909 | 0.583571429 | 0.783636364 | 1.103636364 | 0.859083333 | 0.771428571 | 0.560416667 | 0.479166667 | 0.715 | 0.827583333 | 0.835 | 1.035363636 | 0.419090909 | 0.474166667 | 0.373090909 | 0.311916667 | 0.185666667 | 0.342818182 | 0.187416667 | 0.2225 | 0.205666667 | 0.205416667 | 0.197166667 | 0.163416667 | 0.17775 | 0.1248 | 0.095777778 | 0.14925 |
SEPA East | Min | 0.010272727 | 0.017625 | 0.0123 | 0.0136 | 0.017 | 0.015714286 | 0.01375 | 0.010714286 | 0.012625 | 0.007083333 | 0.012666667 | 0.007916667 | 0.005 | 0.032304348 | 0.032136364 | 0.023785714 | 0.023666667 | 0.015636364 | 0.01 | 0.018166667 | 0.018529412 | 0.010416667 | 0.003769231 | 0.005166667 | 0.004 | 0.005608696 | 0.004083333 | 0.00425 | 0.004833333 | 0.005 | 0.005157895 | 0.006714286 | 0.004 | 0.004 |
SEPA West | Mean | 0.194749693 | 0.165503604 | 0.155654434 | 0.217949389 | 0.296485396 | 0.16096059 | 0.177676902 | 0.166608438 | 0.183128161 | 0.180177126 | 0.177963643 | 0.199755776 | 0.203853171 | 0.138161688 | 0.178286624 | 0.223071826 | 0.240165481 | 0.210518091 | 0.154263867 | 0.122530101 | 0.132185527 | 0.132138275 | 0.102288166 | 0.122501399 | 0.101390225 | 0.071506489 | 0.055687185 | 0.059598285 | 0.07902811 | 0.072423325 | 0.067359533 | 0.03987052 | 0.031753726 | 0.030940366 |
SEPA West | Max | 0.760714286 | 0.746 | 0.752307692 | 1.393571429 | 1.424166667 | 0.97625 | 1.113666667 | 1.13125 | 1.350357143 | 1.036666667 | 1.010416667 | 1.325416667 | 0.854166667 | 0.723636364 | 0.945833333 | 1.0225 | 1.025 | 0.6732 | 0.5681 | 0.414157895 | 0.448421053 | 0.51376 | 0.3105 | 0.434416667 | 0.345713636 | 0.290545455 | 0.265148148 | 0.272333333 | 0.266416667 | 0.265416667 | 0.267272727 | 0.128545455 | 0.1435 | 0.2028 |
SEPA West | Min | 0.007566667 | 0.005633333 | 0.007727273 | 0.007083333 | 0.005416667 | 0.006125 | 0.009958333 | 0.0075 | 0.005 | 0.006333333 | 0.00740625 | 0.006208333 | 0.004666667 | 0.00375 | 0.002615385 | 0.004653846 | 0.00425 | 0.0045 | 0.005272727 | 0.003 | 0.003266667 | 0.0040625 | 0.008125 | 0.004470588 | 0.007390909 | 0.002923077 | 0.0015 | 0.002791667 | 0.010958333 | 0.0083 | 0.0125 | 0.0065 | 0.004 | 0.004 |
GB Average | Not set | 0.398961842 | 0.386519909 | 0.432277262 | 0.510819793 | 0.579391301 | 0.513650119 | 0.476163536 | 0.462518722 | 0.47436735 | 0.685739219 | 0.635550261 | 0.556460381 | 0.444413006 | 0.367615253 | 0.359945238 | 0.495173424 | 0.586852431 | 0.577575982 | 0.45066157 | 0.398083806 | 0.325226843 | 0.329806715 | 0.291241646 | 0.332555771 | 0.271186799 | 0.267499775 | 0.256044269 | 0.196073011 | 0.163915217 | 0.173667997 | 0.171597809 | 0.204006225 | 0.135089055 | 0.145745784 |
Not set | 90th Percentile | 1.089881993 | 1.0436 | 1.136862069 | 1.495297483 | 1.734 | 1.532142857 | 1.343428571 | 1.362857143 | 1.366220238 | 2.048088571 | 2.052684332 | 1.7025 | 1.2034 | 1.073267196 | 0.990208333 | 1.475145833 | 1.808847484 | 1.732205357 | 1.30199718 | 1.187294118 | 1.038633077 | 0.944833333 | 0.91225 | 0.983833333 | 0.756711538 | 0.791208333 | 0.60725 | 0.544583333 | 0.434852273 | 0.494833333 | 0.452333333 | 0.617416667 | 0.374333333 | 0.45275 |
Not set | 10th Percentile | 0.020291667 | 0.016666667 | 0.015 | 0.014296537 | 0.0125 | 0.015833333 | 0.01875 | 0.01375 | 0.01566875 | 0.011175 | 0.016047794 | 0.0145 | 0.011583333 | 0.013333333 | 0.0123 | 0.011021538 | 0.011125 | 0.008157692 | 0.008979167 | 0.008883333 | 0.00788 | 0.00925 | 0.008388112 | 0.00925 | 0.010625 | 0.012083333 | 0.012458333 | 0.010666667 | 0.010085417 | 0.010308333 | 0.01 | 0.01 | 0.008125 | 0.008666667 |
Not set | Number of HMS sites | 238 | 237 | 237 | 226 | 223 | 221 | 229 | 221 | 216 | 224 | 222 | 223 | 223 | 222 | 223 | 224 | 224 | 216 | 200 | 212 | 204 | 207 | 222 | 227 | 226 | 226 | 226 | 225 | 224 | 225 | 226 | 225 | 226 | 227 |