Statistical data set
Annual average, highest and lowest mean concentrations of nitrates 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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| Nitrate - 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 | 11.45414913 | 11.07373817 | 12.40050197 | 11.92680958 | 14.36967241 | 13.86933592 | 13.64806632 | 12.39664058 | 11.38403839 | 13.15195939 | 13.40434018 | 15.49010596 | 15.13487037 | 15.09946219 | 14.62178742 | 19.159745 | 23.79768424 | 21.26543675 | 16.94008131 | 16.83304429 | 15.57387387 | 17.30121925 | 16.27923408 | 20.73192359 | 15.30741568 | 16.02227859 | 16.58700495 | 15.24275911 | 12.73862226 | 15.6739579 | 16.49637921 | 16.10030094 | 12.47997325 | 16.13905719 |
| North West | Max | 31.04547962 | 30.0500251 | 42.28433657 | 30.5118477 | 42.34395195 | 29.20251818 | 29.46526808 | 28.83184245 | 27.25268784 | 34.84910074 | 30.60403065 | 36.05945787 | 41.75271259 | 36.44628768 | 38.77036768 | 83.57291117 | 87.14072043 | 76.24914714 | 42.63518159 | 48.4216338 | 45.79409799 | 63.13789072 | 43.85988587 | 77.44463536 | 41.39606742 | 45.87999556 | 52.54868539 | 44.10856716 | 40.34428181 | 63.70868431 | 51.53380454 | 52.17537957 | 39.33678191 | 46.02023364 |
| North West | Min | 2.56857118 | 1.741904593 | 1.69551004 | 2.2142855 | 2.551538215 | 2.316483292 | 3.155356838 | 2.401269609 | 1.662016646 | 1.6448978 | 1.812946253 | 2.123383253 | 2.231318465 | 1.882142675 | 1.51634271 | 1.795274552 | 2.609450297 | 3.27714254 | 2.424273575 | 1.686077759 | 1.729726023 | 1.274163142 | 1.43179107 | 1.610154606 | 1.802059349 | 2.05854742 | 2.454535477 | 2.146153638 | 2.231999784 | 1.928642671 | 1.775856971 | 1.655604235 | 1.657761744 | 1.679904599 |
| North East | Mean | 14.28087682 | 14.32354712 | 14.05417865 | 14.45141692 | 15.53335684 | 15.19644645 | 16.09824087 | 14.12089857 | 13.93079993 | 13.82062492 | 13.96106599 | 15.02591967 | 17.52121729 | 16.90790681 | 16.49624842 | 17.60052456 | 19.39452473 | 19.23715152 | 19.77157594 | 17.73293377 | 16.61629412 | 17.55930001 | 16.34951792 | 17.42209178 | 16.77321665 | 17.37479725 | 17.23627224 | 17.31269313 | 14.97773951 | 15.00895107 | 15.86071844 | 15.80813341 | 14.61452352 | 15.16815842 |
| North East | Max | 32.97937569 | 34.8591803 | 33.71838579 | 32.8004879 | 38.63928198 | 40.42263345 | 41.3997579 | 34.22916335 | 36.61465484 | 39.05815098 | 35.48550677 | 36.72972434 | 45.91453841 | 43.52665293 | 40.98553889 | 42.27982784 | 49.270208 | 44.02851222 | 47.02345259 | 42.49909793 | 38.90499624 | 41.79363232 | 40.79821034 | 38.75553196 | 41.85558993 | 43.13797202 | 44.17130525 | 44.03844812 | 41.78725786 | 40.25571039 | 43.1711863 | 53.53035196 | 42.20059115 | 44.18237668 |
| North East | Min | 1.80648792 | 2.217975976 | 1.612737939 | 1.383928438 | 1.907976006 | 2.177380742 | 2.210595024 | 2.686666407 | 1.649642698 | 2.031606946 | 1.513095092 | 1.679166504 | 1.49648795 | 1.738214118 | 1.851142678 | 2.196571216 | 3.000356853 | 3.06719547 | 3.83387718 | 2.285545233 | 2.714397697 | 3.220124688 | 2.439773573 | 1.97145219 | 1.84929744 | 2.083273608 | 2.114642653 | 2.150809316 | 2.296952159 | 1.862952201 | 1.806856968 | 1.70573793 | 1.702047454 | 1.473976048 |
| Midlands | Mean | 31.90725821 | 30.9122627 | 30.76158057 | 33.01661633 | 36.19042838 | 35.60586142 | 36.91896098 | 36.28375467 | 33.99389795 | 36.44453917 | 37.75444888 | 38.63920625 | 37.13598768 | 36.33321648 | 34.43989761 | 36.20549699 | 40.85721655 | 39.69426451 | 40.00952591 | 38.76044922 | 33.96353404 | 34.1721716 | 31.75669441 | 36.56644611 | 34.11123732 | 33.71971708 | 36.07823324 | 36.09831559 | 31.75414892 | 32.45530573 | 32.18551789 | 35.1959204 | 31.23932145 | 32.42081828 |
| Midlands | Max | 52.53392349 | 53.32737579 | 51.69618547 | 56.29820884 | 55.39739724 | 55.54450012 | 62.10332732 | 57.14782056 | 60.61992769 | 63.03332723 | 61.77856545 | 63.28638843 | 61.0677798 | 59.81057065 | 56.63538413 | 64.2142795 | 71.87911392 | 70.857136 | 65.78440922 | 64.12939856 | 61.42087318 | 59.30594664 | 48.36737627 | 70.31586621 | 61.99630352 | 61.65252151 | 72.9690108 | 65.98254464 | 63.66241142 | 66.24404121 | 73.82087198 | 72.44404061 | 65.17380322 | 61.66785118 |
| Midlands | Min | 6.52265243 | 4.355581589 | 4.255454134 | 3.819285345 | 5.185645757 | 7.402274416 | 7.094570742 | 10.70237992 | 2.734642593 | 3.908213908 | 5.100908597 | 6.50488948 | 6.312485103 | 6.278351041 | 5.347499483 | 4.458094807 | 7.869017096 | 7.230380253 | 7.934523042 | 12.12406476 | 5.085021486 | 4.819269375 | 4.79658525 | 6.159158134 | 8.168056352 | 5.612180409 | 5.827596839 | 11.35485604 | 8.617317847 | 7.897618283 | 5.417618523 | 4.018928183 | 4.661070978 | 5.071820938 |
| Anglian | Mean | 38.43849131 | 38.75780738 | 40.01319449 | 40.4230199 | 39.90900682 | 39.12087377 | 42.44942412 | 41.44532094 | 38.83442351 | 31.01678321 | 29.83675102 | 31.8721283 | 36.87197098 | 39.47596987 | 37.39134344 | 34.18625192 | 34.09090465 | 30.86505198 | 41.70431981 | 39.58893532 | 37.26717624 | 35.89630419 | 34.29803073 | 34.11144556 | 40.80976204 | 31.09591792 | 31.38153768 | 34.56954055 | 34.18687665 | 30.75668349 | 31.54424444 | 27.52305758 | 31.37482998 | 35.06822592 |
| Anglian | Max | 52.03814253 | 57.70122594 | 53.142852 | 55.02499468 | 53.39834648 | 49.94542374 | 60.56653549 | 49.618071 | 48.2262344 | 40.6028146 | 39.65740141 | 44.22573977 | 47.4037855 | 50.36460154 | 43.49233622 | 40.62383535 | 43.4922577 | 44.22481715 | 55.5564232 | 57.63508371 | 62.66427965 | 44.30468959 | 44.44272297 | 48.78272255 | 57.84451821 | 57.21713732 | 50.36761417 | 52.89189964 | 52.56713777 | 46.40035265 | 44.46285284 | 41.91273404 | 45.86523366 | 52.36047112 |
| Anglian | Min | 26.03533583 | 27.18299057 | 25.26298457 | 25.07063249 | 27.52799734 | 25.19856899 | 27.96992211 | 30.47662043 | 31.39224186 | 19.3230302 | 20.91501198 | 14.66941549 | 25.06109877 | 26.35368793 | 28.37539084 | 28.80457393 | 27.14898547 | 23.0285692 | 31.54803266 | 28.23952108 | 27.14714023 | 27.2673443 | 29.08833052 | 17.50687926 | 26.94416406 | 15.73065324 | 17.25223643 | 24.43833097 | 23.65225962 | 23.0595692 | 24.65606904 | 19.96547426 | 19.2406648 | 25.38309278 |
| South East | Mean | 29.8340866 | 30.10851145 | 29.17414884 | 29.53926211 | 29.91492399 | 29.72209203 | 28.91330927 | 28.00005104 | 27.14108985 | 28.77670886 | 30.30407013 | 31.5205134 | 30.45648544 | 29.42285405 | 27.80760943 | 28.14422278 | 31.67368963 | 31.82666893 | 30.90605383 | 28.59267642 | 27.75800624 | 27.27654521 | 28.11989366 | 30.61993659 | 30.96397784 | 31.36065327 | 30.94746817 | 28.73700776 | 28.18356888 | 28.75236947 | 29.44994802 | 30.85318157 | 28.0434478 | 29.52964532 |
| South East | Max | 70.56189793 | 59.07713714 | 64.35384659 | 55.52479055 | 57.37442795 | 56.66356595 | 51.24049194 | 51.31505997 | 51.67179624 | 52.96201868 | 58.46395039 | 56.121066 | 51.33979095 | 43.53625952 | 44.76882684 | 42.40356733 | 53.91785193 | 55.13570895 | 52.73689966 | 60.40201796 | 55.92547078 | 49.06118573 | 55.49368511 | 51.35297122 | 55.72987556 | 69.30713615 | 59.71927994 | 56.94773258 | 52.64832824 | 54.6854709 | 56.68201832 | 58.10285152 | 51.55594739 | 49.6476875 |
| South East | Min | 11.15091467 | 13.36772357 | 9.431216019 | 11.75785601 | 13.26198851 | 13.49164155 | 11.2004337 | 10.39173812 | 8.42693796 | 12.08815359 | 11.86737337 | 12.77560723 | 10.63299897 | 10.0245887 | 10.08490504 | 7.800845806 | 11.19258652 | 14.39197004 | 9.73652967 | 8.679261065 | 9.634725258 | 8.341951574 | 10.31788911 | 8.176752455 | 10.31451091 | 8.971546751 | 9.02917495 | 8.064427791 | 8.8036301 | 5.041559036 | 9.047201505 | 5.986689897 | 12.28301072 | 8.040808746 |
| South West | Mean | 15.0439919 | 14.1835285 | 15.29509758 | 16.89358672 | 18.561026 | 18.72299605 | 17.3623667 | 18.01192438 | 17.18255397 | 17.82555501 | 17.36824412 | 20.3829031 | 18.06032311 | 18.69227487 | 17.95293802 | 18.40915805 | 20.24224745 | 20.61271706 | 19.8482071 | 15.46233696 | 17.98565587 | 17.18460437 | 18.49658562 | 18.5004862 | 18.94617177 | 18.61918216 | 19.14372554 | 18.47771423 | 17.45219923 | 16.72860995 | 17.50653154 | 16.87495908 | 16.66227831 | 16.67068419 |
| South West | Max | 36.94636006 | 34.0999967 | 37.70928207 | 35.61503415 | 36.11815977 | 41.10205951 | 42.40356733 | 37.03248089 | 37.54136541 | 39.09188193 | 36.85918898 | 48.58142387 | 38.76475815 | 40.95953685 | 38.13769817 | 37.33639639 | 37.76208426 | 41.56299503 | 39.59142474 | 37.97130585 | 35.07981803 | 35.11413946 | 41.16356745 | 36.68467177 | 37.5824639 | 36.55181464 | 38.31082963 | 36.7719012 | 32.62649035 | 34.23654431 | 37.00956785 | 36.23899649 | 31.33530309 | 32.83047301 |
| South West | Min | 4.703142402 | 4.59967488 | 5.53571375 | 6.347618433 | 5.791208231 | 6.329166054 | 5.53571375 | 6.104047028 | 5.683332783 | 6.617825447 | 5.686285164 | 6.266427965 | 6.360109275 | 5.689010438 | 4.578461095 | 5.258928063 | 6.15571369 | 6.281125285 | 5.717322066 | 5.653808977 | 5.440130426 | 4.478761471 | 5.577342317 | 5.598451839 | 4.786882654 | 4.473594805 | 3.259428256 | 4.975499519 | 4.865977551 | 4.014329282 | 4.450713855 | 4.150309122 | 5.232356637 | 4.450713855 |
| Wales | Mean | 6.162051225 | 5.652221366 | 5.720014464 | 5.774294305 | 6.507259894 | 6.17898463 | 6.701628227 | 6.614360587 | 5.766096889 | 5.386759187 | 7.792831086 | 7.39466839 | 7.404150921 | 6.980904969 | 6.272260796 | 6.301334942 | 9.159905543 | 8.530863219 | 8.13249722 | 7.622907529 | 6.973298258 | 6.089876135 | 5.926645695 | 7.00778458 | 6.797534702 | 6.321381796 | 7.121270755 | 6.599028737 | 5.937836893 | 5.635141559 | 5.796600067 | 5.275964171 | 5.652685823 | 5.409232254 |
| Wales | Max | 18.60402417 | 18.27200716 | 19.13281065 | 17.42142689 | 16.1959168 | 18.64428391 | 17.26079833 | 16.03545299 | 14.59214145 | 17.16071263 | 24.71947813 | 20.5083097 | 18.92660531 | 19.90642665 | 18.07173295 | 17.69214115 | 27.8999973 | 25.19561661 | 28.31702107 | 27.40178306 | 30.50916371 | 17.4087126 | 16.89499837 | 28.57978295 | 21.68892647 | 23.04702158 | 22.59309305 | 21.86606931 | 19.8215457 | 20.61499801 | 22.2646407 | 24.88856902 | 21.6999979 | 20.157379 |
| Wales | Min | 0.79714278 | 0.483452334 | 0.70857136 | 0.732727202 | 0.699714218 | 1.077618943 | 1.574155692 | 1.171110998 | 0.855054862 | 0.58204076 | 0.614789856 | 1.08183663 | 0.939627238 | 0.802919177 | 0.705618979 | 1.149657032 | 1.197559408 | 0.87648801 | 0.963214193 | 1.010267759 | 0.712318612 | 0.692870063 | 0.721857073 | 0.845488013 | 0.74363088 | 0.60782137 | 1.123380844 | 0.514395555 | 0.608928513 | 0.57571423 | 0.583833277 | 0.561690422 | 0.488619 | 0.525523759 |
| SEPA North | Mean | 5.674331669 | 5.373983864 | 4.674589284 | 4.960627756 | 6.044577487 | 6.216307694 | 4.862564286 | 5.353410994 | 5.907095533 | 5.194211194 | 5.405733703 | 6.637926938 | 6.507785085 | 6.471265162 | 6.458312366 | 6.696416328 | 6.977298472 | 7.243611694 | 8.178726634 | 7.285474363 | 7.431400265 | 6.509108492 | 6.523772624 | 6.58614612 | 7.111601142 | 7.184510015 | 6.966166529 | 6.907575684 | 6.741571486 | 6.47881905 | 6.039316108 | 5.814590251 | 5.959665771 | 5.933586636 |
| SEPA North | Max | 25.69555307 | 23.35185488 | 21.86237884 | 24.42356907 | 26.26483262 | 27.09882855 | 25.26499756 | 29.02928291 | 29.58728285 | 25.92727022 | 28.49986737 | 33.14416346 | 33.6719015 | 33.49844914 | 33.08880632 | 33.96292188 | 35.66106798 | 34.36017525 | 37.39485352 | 35.86035367 | 35.1074966 | 34.2457705 | 31.70051641 | 32.64259424 | 35.35881801 | 33.64828246 | 33.46389287 | 33.08142537 | 31.73317153 | 30.62356847 | 31.41333029 | 29.2433305 | 28.94809244 | 29.16214004 |
| SEPA North | Min | 0.231493484 | 0.228809502 | 0.199285695 | 0.169761888 | 0.236190453 | 0.302619018 | 0.245584392 | 0.26571426 | 0.243571405 | 0.22142855 | 0.22142855 | 0.295238067 | 0.243571405 | 0.271249974 | 0.239545431 | 0.166071413 | 0.23065474 | 0.223273788 | 0.238404739 | 0.475480906 | 0.626310654 | 0.295909062 | 0.119571417 | 0.250384591 | 0.193380934 | 0.343214253 | 0.355392823 | 0.348380919 | 0.392666629 | 0.286528544 | 0.273464259 | 0.32070235 | 0.454935021 | 0.395803533 |
| SEPA East | Mean | 11.39151814 | 10.58269679 | 9.952897955 | 11.31638252 | 13.06502878 | 12.84292795 | 12.6620142 | 11.96013434 | 11.88399871 | 10.53578121 | 11.68010183 | 14.10970567 | 16.58207062 | 19.14342154 | 12.50050688 | 12.83977685 | 14.49202979 | 11.48187072 | 11.08987988 | 13.38049142 | 13.16286714 | 12.3637656 | 10.9259948 | 10.42887582 | 11.97443263 | 11.64336135 | 11.40444414 | 11.35913921 | 10.77105967 | 10.37234066 | 10.50267988 | 9.659379122 | 10.02260533 | 9.793474681 |
| SEPA East | Max | 28.7857115 | 29.06752965 | 27.46519215 | 30.0538932 | 33.27185392 | 33.26742535 | 30.43636069 | 33.12571108 | 35.40441216 | 31.78053264 | 34.32142525 | 39.47064553 | 41.95467126 | 41.65809121 | 36.12908741 | 38.7426153 | 39.44749618 | 24.50845001 | 25.54178324 | 39.51895721 | 41.26622977 | 34.04242528 | 34.1987879 | 29.41778936 | 31.84880644 | 32.78752929 | 33.05559204 | 30.98892557 | 31.24356841 | 30.80071131 | 29.66773522 | 27.52725924 | 29.72309236 | 27.27999736 |
| SEPA East | Min | 1.897959 | 0.811904683 | 1.11346928 | 0.8857142 | 0.9489795 | 1.12612234 | 1.431904623 | 0.81612237 | 1.3285713 | 0.959523717 | 0.766142783 | 1.402380817 | 2.512207549 | 4.146618646 | 1.970714095 | 2.420952147 | 3.49857109 | 3.424761573 | 4.085356748 | 2.856428295 | 2.118702176 | 0.902321341 | 2.315404538 | 1.630083176 | 0.858740177 | 0.958181725 | 1.052637261 | 0.978345143 | 0.854714203 | 0.740309452 | 0.945701207 | 0.787020332 | 0.571285659 | 0.656233703 |
| SEPA West | Mean | 6.542152426 | 5.488773552 | 5.070971463 | 6.121248169 | 7.348619444 | 7.745172767 | 6.958308084 | 5.649262182 | 5.059158415 | 5.338615475 | 5.623070315 | 6.482040858 | 5.192093369 | 5.305496671 | 5.595156626 | 5.477792404 | 7.332815631 | 6.888047712 | 6.740598193 | 4.83022855 | 5.122802262 | 5.417111302 | 5.079305311 | 4.546231373 | 5.346265031 | 5.165063491 | 5.96934748 | 5.206012937 | 4.484464934 | 4.440375578 | 4.701703966 | 4.311112509 | 3.634303918 | 3.692746119 |
| SEPA West | Max | 13.80765173 | 12.66571306 | 11.29285605 | 14.22678434 | 15.88749846 | 13.1424357 | 13.743332 | 13.0227666 | 10.38701198 | 11.48845127 | 10.68761801 | 15.12960893 | 10.22597304 | 12.48051827 | 11.86857028 | 12.13059406 | 13.11595111 | 12.96363511 | 14.15934928 | 9.277856245 | 8.453649976 | 9.380755395 | 9.438391944 | 9.703183585 | 10.11485616 | 13.32999871 | 12.62585592 | 11.18657035 | 9.955427608 | 9.252022914 | 9.735475248 | 9.047570553 | 7.48576118 | 9.370856236 |
| SEPA West | Min | 1.275428448 | 0.980190381 | 0.950666575 | 0.789761828 | 1.291666542 | 1.476190333 | 1.439285575 | 1.254761783 | 1.252077801 | 1.268181695 | 1.221547501 | 1.402380817 | 1.132976081 | 0.595844098 | 0.989047523 | 1.206785598 | 1.686882954 | 1.031857043 | 1.431904623 | 1.16205703 | 0.836999919 | 0.996428475 | 1.331031617 | 0.53142852 | 1.01857133 | 0.918928483 | 1.457295097 | 0.59146026 | 0.732559453 | 0.786272651 | 1.021031647 | 0.854160632 | 0.781199924 | 0.502959135 |
| GB Average | Not set | 15.93689728 | 15.32585716 | 15.45208263 | 15.9239254 | 17.30492973 | 16.87849998 | 16.82979393 | 16.33945274 | 15.6174593 | 15.5322485 | 16.24414253 | 17.65570831 | 17.82014656 | 17.87960243 | 16.67958641 | 17.427845 | 19.84289551 | 19.20329475 | 19.57365799 | 17.81476593 | 17.02467728 | 16.5321331 | 16.50048447 | 17.86553574 | 17.72472572 | 17.07514191 | 17.48977852 | 16.95141602 | 15.63769531 | 15.60916519 | 16.10233307 | 15.89101982 | 15.07045078 | 16.01245117 |
| Not set | 90th Percentile | 35.31477833 | 34.0999967 | 33.9929729 | 36.02434761 | 39.02530575 | 38.92985839 | 39.08213908 | 37.85321062 | 36.34894058 | 36.29022821 | 34.45768897 | 39.47064553 | 39.43835022 | 39.33950439 | 38.13769817 | 36.89100292 | 40.27508539 | 38.26698677 | 41.4435164 | 37.98422251 | 36.34675839 | 35.05395115 | 35.65368703 | 37.76242492 | 39.35154381 | 36.18548459 | 36.50249647 | 35.77882771 | 32.94856824 | 33.59071104 | 35.23020492 | 36.23899649 | 32.52047304 | 35.45809181 |
| Not set | 10th Percentile | 2.445401549 | 1.848928393 | 1.741583682 | 1.996379677 | 2.105259678 | 2.144166459 | 2.758999733 | 2.401269609 | 1.94857124 | 1.57530597 | 2.016703102 | 2.324999775 | 2.231318465 | 1.974404571 | 1.907692123 | 2.213399786 | 2.92285686 | 2.701854134 | 2.653519224 | 2.336715358 | 2.149560232 | 1.861453644 | 2.165789293 | 2.071363436 | 2.445341378 | 2.193618835 | 2.348987868 | 1.926428385 | 1.99820814 | 1.709831003 | 1.772799148 | 1.524636216 | 1.673375296 | 1.62591821 |
| Not set | Number of HMS sites | 238 | 237 | 237 | 226 | 222 | 220 | 229 | 221 | 222 | 224 | 222 | 223 | 213 | 213 | 223 | 226 | 226 | 216 | 213 | 222 | 225 | 224 | 222 | 223 | 227 | 226 | 226 | 225 | 224 | 225 | 226 | 225 | 226 | 227 |