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EWG's Tap Water Database — 2021 UPDATE

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Nitrate

Dover Water Department

Nitrate, a fertilizer chemical, frequently contaminates drinking water due to agricultural and urban runoff, and discharges from municipal wastewater treatment plants and septic tanks. Excessive nitrate in water can cause oxygen deprivation in infants and increase the risk of cancer. Click here to read more about nitrate.

MORE ABOUT THIS CONTAMINANT

 

630

Samples

0

Samples exceeding legal limit (MCL)

53

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.321 ppm1019ND - 6.40 ppm
20150.469 ppm9410ND - 5.30 ppm
20160.343 ppm1059ND - 4.50 ppm
20170.230 ppm1059ND - 4.00 ppm
20180.145 ppm1098ND - 2.57 ppm
20190.190 ppm1169ND - 2.92 ppm

ppm = parts per million

State and national drinking water standards and health guidelines

EWG Health Guideline 0.14 ppm

The EWG Health Guideline of 0.14 ppm for nitrate was defined by EWG . This health guideline protects against cancer and harm to fetal growth and development.

EPA Maximum Contaminant
Level (MCL) 10 ppm

The legal limit for nitrate, established in 1962, was developed to protect infants from acute methemoglobinemia, a life-threatening disorder of oxygen transport in the body. This limit does not fully protect against the risk of cancer and harm to the developing fetus.

ppm = parts per million

All test results

Date Lab ID Result
2014-01-28S503750ND
2014-01-28S503751ND
2014-01-28S503752ND
2014-01-28S503753ND
2014-01-28S503754ND
2014-01-28S503755ND
2014-01-28S503756ND
2014-02-20S503830ND
2014-02-20S503831ND
2014-02-20S503832ND
2014-02-20S503833ND
2014-02-20S503834ND
2014-02-20S503835ND
2014-02-20S503837ND
2014-02-20S5038383.00 ppm
2014-03-19S481300ND
2014-03-19S481301ND
2014-03-19S481302ND
2014-03-19S481303ND
2014-03-19S481304ND
2014-03-19S4813052.00 ppm
2014-03-19S481306ND
2014-03-19S481307ND
2014-04-15S4811984.50 ppm
2014-04-23S481191ND
2014-04-23S481192ND
2014-04-23S481193ND
2014-04-23S481194ND
2014-04-23S481195ND
2014-04-23S481196ND
2014-04-23S481197ND
2014-05-19S495006ND
2014-05-20S4812471.70 ppm
2014-05-28S481240ND
2014-05-28S481241ND
2014-05-28S481242ND
2014-05-28S481243ND
2014-05-28S481244ND
2014-05-28S481245ND
2014-05-28S481246ND
2014-06-18S553510ND
2014-06-18S553511ND
2014-06-18S553512ND
2014-06-18S553513ND
2014-06-18S553514ND
2014-06-18S553515ND
2014-06-18S553517ND
2014-06-18S5535181.30 ppm
2014-07-17S262070ND
2014-07-17S262072ND
2014-07-17S262073ND
2014-07-17S262076ND
2014-07-17S262077ND
2014-07-17S262080ND
2014-07-17S2620833.40 ppm
2014-07-21S262071ND
2014-07-21S262074ND
2014-07-21S262075ND
2014-07-21S262078ND
2014-07-21S262079ND
2014-07-21S262082ND
2014-08-20S563960ND
2014-08-20S563961ND
2014-08-20S563962ND
2014-08-20S563963ND
2014-08-20S563964ND
2014-08-20S563965ND
2014-08-20S563966ND
2014-08-20S5639675.20 ppm
2014-09-25S573570ND
2014-09-25S573571ND
2014-09-25S573572ND
2014-09-25S573573ND
2014-09-25S573574ND
2014-09-25S573575ND
2014-09-25S573577ND
2014-09-25S5735784.90 ppm
2014-10-28S573620ND
2014-10-28S573621ND
2014-10-28S573622ND
2014-10-28S573623ND
2014-10-28S573624ND
2014-10-28S573625ND
2014-10-28S573627ND
2014-10-28S5736286.40 ppm
2014-11-21S262081ND
2014-11-21S573830ND
2014-11-21S573831ND
2014-11-21S573832ND
2014-11-21S573833ND
2014-11-21S573834ND
2014-11-21S573835ND
2014-11-21S573836ND
2014-12-17S573700ND
2014-12-17S573701ND
2014-12-17S573702ND
2014-12-17S573703ND
2014-12-17S573704ND
2014-12-17S573705ND
2014-12-17S573706ND
2014-12-17S573707ND
2015-01-20S573730ND
2015-01-20S573731ND
2015-01-20S573732ND
2015-01-20S573733ND
2015-01-20S573734ND
2015-01-20S573735ND
2015-01-20S573736ND
2015-01-20S573737ND
2015-01-20S5737383.50 ppm
2015-02-18S573890ND
2015-02-18S573891ND
2015-02-18S573892ND
2015-02-18S573893ND
2015-02-18S573894ND
2015-02-18S573895ND
2015-02-18S573896ND
2015-02-18S573897ND
2015-03-18S573840ND
2015-03-18S573841ND
2015-03-18S573842ND
2015-03-18S573843ND
2015-03-18S573844ND
2015-03-18S573845ND
2015-03-18S573846ND
2015-03-23S5639283.60 ppm
2015-04-29S5741102.60 ppm
2015-04-29S574111ND
2015-04-29S574112ND
2015-04-29S574113ND
2015-04-29S574114ND
2015-04-29S574115ND
2015-04-29S574116ND
2015-04-29S574117ND
2015-05-22S574180ND
2015-05-22S574181ND
2015-05-22S574182ND
2015-05-22S574183ND
2015-05-22S574184ND
2015-05-22S574186ND
2015-05-22S574187ND
2015-05-28S5741885.00 ppm
2015-06-22S574870ND
2015-06-22S574871ND
2015-06-22S574872ND
2015-06-22S574873ND
2015-06-22S574874ND
2015-06-22S5748755.00 ppm
2015-06-22S574876ND
2015-06-22S574877ND
2015-07-27S5739004.90 ppm
2015-07-27S573901ND
2015-07-27S573902ND
2015-07-27S573903ND
2015-07-27S573904ND
2015-07-27S573906ND
2015-07-28S573905ND
2015-08-10S497436ND
2015-08-10S497440ND
2015-08-10S497441ND
2015-08-10S497442ND
2015-08-10S497443ND
2015-08-10S497444ND
2015-08-10S497446ND
2015-08-10S497450ND
2015-08-11S497437ND
2015-08-11S497445ND
2015-08-11S4974494.80 ppm
2015-09-24S629380ND
2015-09-24S629381ND
2015-09-24S629382ND
2015-09-24S629383ND
2015-09-24S629384ND
2015-09-24S629385ND
2015-09-24S6293864.70 ppm
2015-11-16S643280ND
2015-11-16S643282ND
2015-11-16S643283ND
2015-11-16S643284ND
2015-11-16S643286ND
2015-11-16S643287ND
2015-11-16S6432885.30 ppm
2015-12-07S446525ND
2015-12-07S497447ND
2015-12-09S645660ND
2015-12-09S645661ND
2015-12-09S645662ND
2015-12-09S645663ND
2015-12-09S645666ND
2015-12-09S64569ND
2015-12-17S497439ND
2015-12-17S643285ND
2015-12-20S4314334.70 ppm
2015-12-27S497438ND
2015-12-27S643281ND
2016-01-26S6372081.60 ppm
2016-01-28S637200ND
2016-01-28S637201ND
2016-01-28S637202ND
2016-01-28S637203ND
2016-01-28S637204ND
2016-01-28S637206ND
2016-01-28S637207ND
2016-02-17S645750ND
2016-02-17S645751ND
2016-02-17S645752ND
2016-02-17S645753ND
2016-02-17S645754ND
2016-02-17S645755ND
2016-02-17S645756ND
2016-02-17S645757ND
2016-03-23S645800ND
2016-03-23S645801ND
2016-03-23S645802ND
2016-03-23S645804ND
2016-03-23S645805ND
2016-03-23S645806ND
2016-03-23S645807ND
2016-03-24S431431ND
2016-03-29S6456574.50 ppm
2016-04-18S6458194.00 ppm
2016-04-21S645810ND
2016-04-21S645811ND
2016-04-21S645812ND
2016-04-21S645813ND
2016-04-21S645814ND
2016-04-21S645815ND
2016-04-21S645816ND
2016-04-21S645817ND
2016-05-16S645900ND
2016-05-16S645901ND
2016-05-16S645902ND
2016-05-16S645903ND
2016-05-16S645904ND
2016-05-16S645905ND
2016-05-16S645906ND
2016-05-16S645907ND
2016-05-16S6459084.50 ppm
2016-06-14S645950ND
2016-06-14S645951ND
2016-06-14S645952ND
2016-06-14S645953ND
2016-06-14S645954ND
2016-06-14S645955ND
2016-06-14S645956ND
2016-06-14S645957ND
2016-06-14S6459584.20 ppm
2016-07-27S645960ND
2016-07-27S645961ND
2016-07-27S645962ND
2016-07-27S645964ND
2016-07-27S645965ND
2016-07-27S645966ND
2016-07-27S645967ND
2016-08-18S646040ND
2016-08-18S646041ND
2016-08-18S646042ND
2016-08-18S646043ND
2016-08-18S646044ND
2016-08-18S646045ND
2016-08-18S646046ND
2016-08-18S646047ND
2016-08-18S6460484.50 ppm
2016-09-22S503760ND
2016-09-22S503761ND
2016-09-22S503762ND
2016-09-22S503763ND
2016-09-22S503764ND
2016-09-22S503765ND
2016-09-22S503766ND
2016-09-22S503767ND
2016-09-22S5037684.30 ppm
2016-10-27S714851ND
2016-10-27S714852ND
2016-10-27S714853ND
2016-10-27S714854ND
2016-10-27S714855ND
2016-10-27S714856ND
2016-10-27S714857ND
2016-10-27S7148584.40 ppm
2016-11-15S6433594.00 ppm
2016-11-16S643351ND
2016-11-16S643352ND
2016-11-16S643353ND
2016-11-16S643354ND
2016-11-16S643355ND
2016-11-16S643356ND
2016-11-16S643357ND
2016-12-20S714951ND
2016-12-20S714952ND
2016-12-20S714953ND
2016-12-20S714954ND
2016-12-20S714955ND
2016-12-20S714956ND
2016-12-20S714957ND
2016-12-29S637225ND
2016-12-29S637226ND
2016-12-29S637227ND
2016-12-29S637228ND
2016-12-29S637229ND
2017-01-18S714700ND
2017-01-18S714701ND
2017-01-18S714702ND
2017-01-18S714703ND
2017-01-18S714704ND
2017-01-18S714705ND
2017-01-30S714706ND
2017-02-21S714754ND
2017-02-21S714755ND
2017-02-21S714756ND
2017-02-21S714757ND
2017-02-21S714759ND
2017-02-21S714760ND
2017-03-21S7145293.50 ppm
2017-03-21S714820ND
2017-03-21S714821ND
2017-03-21S714823ND
2017-03-21S714824ND
2017-03-21S714826ND
2017-03-21S714827ND
2017-03-21S714828ND
2017-04-18S714562ND
2017-04-18S714563ND
2017-04-18S714564ND
2017-04-18S714565ND
2017-04-18S714566ND
2017-04-18S714567ND
2017-04-18S714568ND
2017-04-26S7145603.00 ppm
2017-05-23S714620ND
2017-05-23S714621ND
2017-05-23S714622ND
2017-05-23S714623ND
2017-05-23S714624ND
2017-05-23S714625ND
2017-05-23S714626ND
2017-05-23S714627ND
2017-05-25S7146292.30 ppm
2017-06-20S714670ND
2017-06-20S714671ND
2017-06-20S714672ND
2017-06-20S714673ND
2017-06-20S714674ND
2017-06-20S714675ND
2017-06-20S714676ND
2017-06-20S714677ND
2017-06-20S7146783.00 ppm
2017-07-17S697550ND
2017-07-17S697551ND
2017-07-17S6975524.00 ppm
2017-07-17S697553ND
2017-07-17S697554ND
2017-07-17S697555ND
2017-07-17S697556ND
2017-07-17S697557ND
2017-07-17S697558ND
2017-08-16S697630ND
2017-08-16S697631ND
2017-08-16S697632ND
2017-08-16S697633ND
2017-08-16S697634ND
2017-08-16S697635ND
2017-08-16S697636ND
2017-08-16S697637ND
2017-08-16S6976383.40 ppm
2017-09-28S697720ND
2017-09-28S697721ND
2017-09-28S697722ND
2017-09-28S697723ND
2017-09-28S697725ND
2017-09-28S697726ND
2017-09-28S697727ND
2017-09-28S6977281.40 ppm
2017-10-18S698700ND
2017-10-18S698701ND
2017-10-18S698702ND
2017-10-18S698703ND
2017-10-18S698704ND
2017-10-18S698705ND
2017-10-18S698706ND
2017-10-18S698707ND
2017-10-18S6987081.80 ppm
2017-11-14S698750ND
2017-11-14S698751ND
2017-11-14S698752ND
2017-11-14S698753ND
2017-11-14S698754ND
2017-11-14S698755ND
2017-11-14S698756ND
2017-11-21S365097ND
2017-12-07S4974691.80 ppm
2017-12-07S497470ND
2017-12-07S497471ND
2017-12-07S497472ND
2017-12-07S497473ND
2017-12-07S497474ND
2017-12-07S497475ND
2017-12-07S497476ND
2017-12-07S497477ND
2017-12-07S497478ND
2017-12-07S497479ND
2017-12-07S497480ND
2017-12-07S497481ND
2017-12-07S497482ND
2017-12-07S497483ND
2018-01-24S779100ND
2018-01-24S779101ND
2018-01-24S779102ND
2018-01-24S779103ND
2018-01-24S779104ND
2018-01-24S779105ND
2018-01-24S779106ND
2018-01-24S779107ND
2018-02-21S779130ND
2018-02-21S779131ND
2018-02-21S779132ND
2018-02-21S779133ND
2018-02-21S7791340.1000 ppm
2018-02-21S779135ND
2018-02-21S779136ND
2018-02-21S779137ND
2018-03-27S779200ND
2018-03-27S779201ND
2018-03-27S779202ND
2018-03-27S779203ND
2018-03-27S779204ND
2018-03-27S779205ND
2018-03-27S779206ND
2018-03-27S779207ND
2018-04-25S779250ND
2018-04-25S779251ND
2018-04-25S779252ND
2018-04-25S779253ND
2018-04-25S779254ND
2018-04-25S779255ND
2018-04-25S779256ND
2018-04-25S779257ND
2018-04-25S7792582.40 ppm
2018-05-06S7793092.38 ppm
2018-05-15S779300ND
2018-05-15S779301ND
2018-05-15S779302ND
2018-05-15S779303ND
2018-05-15S779304ND
2018-05-15S779305ND
2018-05-15S779306ND
2018-05-15S779307ND
2018-06-11S7793591.72 ppm
2018-06-19S779350ND
2018-06-19S779351ND
2018-06-19S779352ND
2018-06-19S779353ND
2018-06-19S779354ND
2018-06-19S779356ND
2018-06-19S779357ND
2018-06-19S779358ND
2018-07-16S800190ND
2018-07-16S800191ND
2018-07-16S800192ND
2018-07-16S800193ND
2018-07-16S800194ND
2018-07-16S8001952.57 ppm
2018-07-16S800196ND
2018-07-16S800197ND
2018-07-16S800199ND
2018-08-29S504160ND
2018-08-29S504161ND
2018-08-29S504162ND
2018-08-29S504163ND
2018-08-29S504164ND
2018-08-29S504165ND
2018-08-29S504166ND
2018-08-29S504167ND
2018-08-29S504168ND
2018-08-29S504169ND
2018-08-29S504170ND
2018-08-29S504171ND
2018-08-29S504172ND
2018-08-29S504173ND
2018-08-29S5041742.18 ppm
2018-09-18S800240ND
2018-09-18S800241ND
2018-09-18S800242ND
2018-09-18S800243ND
2018-09-18S800244ND
2018-09-18S800245ND
2018-09-18S800246ND
2018-09-18S800247ND
2018-09-18S8002482.20 ppm
2018-10-24S807550ND
2018-10-24S807551ND
2018-10-24S807552ND
2018-10-24S807553ND
2018-10-24S807554ND
2018-10-24S807555ND
2018-10-24S807556ND
2018-10-24S807557ND
2018-10-24S8075582.24 ppm
2018-11-13S807620ND
2018-11-13S807621ND
2018-11-13S807622ND
2018-11-13S807623ND
2018-11-13S807624ND
2018-11-13S807625ND
2018-11-13S807626ND
2018-11-13S807627ND
2018-12-13S807630ND
2018-12-13S807631ND
2018-12-13S807632ND
2018-12-13S807633ND
2018-12-13S807634ND
2018-12-13S807635ND
2018-12-13S807636ND
2018-12-13S807637ND
2019-01-16S807710ND
2019-01-16S807711ND
2019-01-16S807712ND
2019-01-16S807713ND
2019-01-16S807714ND
2019-01-16S807715ND
2019-01-16S807716ND
2019-01-16S807717ND
2019-02-21S807770ND
2019-02-21S807772ND
2019-02-21S807773ND
2019-02-21S807774ND
2019-02-21S807775ND
2019-02-21S807776ND
2019-02-21S807777ND
2019-03-19S481380ND
2019-03-19S481383ND
2019-03-19S807804ND
2019-03-19S807805ND
2019-03-19S807806ND
2019-03-19S807807ND
2019-03-19S807808ND
2019-03-28S5639292.55 ppm
2019-04-10S8264782.92 ppm
2019-04-16S826470ND
2019-04-16S826471ND
2019-04-16S826472ND
2019-04-16S826473ND
2019-04-16S826474ND
2019-04-16S826475ND
2019-04-16S826476ND
2019-04-16S826477ND
2019-05-05S8566892.58 ppm
2019-05-14S856680ND
2019-05-14S856681ND
2019-05-14S856682ND
2019-05-14S856683ND
2019-05-14S856684ND
2019-05-14S856685ND
2019-05-14S856686ND
2019-05-14S856687ND
2019-06-18S856750ND
2019-06-18S856751ND
2019-06-18S856752ND
2019-06-18S856753ND
2019-06-18S856754ND
2019-06-18S856755ND
2019-06-18S856756ND
2019-06-20S5041771.81 ppm
2019-07-17S856520ND
2019-07-17S856521ND
2019-07-17S856522ND
2019-07-17S856523ND
2019-07-17S856524ND
2019-07-17S856525ND
2019-07-17S856526ND
2019-07-17S8565282.76 ppm
2019-07-29S848303ND
2019-07-29S856527ND
2019-07-30S848232ND
2019-07-30S848233ND
2019-07-30S8482342.58 ppm
2019-07-30S848292ND
2019-07-30S848293ND
2019-07-30S848294ND
2019-07-30S848295ND
2019-07-30S848296ND
2019-07-30S848297ND
2019-07-30S848298ND
2019-07-30S848299ND
2019-07-30S848300ND
2019-07-30S848301ND
2019-07-30S848302ND
2019-08-27S856580ND
2019-08-27S856581ND
2019-08-27S856582ND
2019-08-27S856583ND
2019-08-27S856584ND
2019-08-27S856585ND
2019-08-27S856586ND
2019-08-27S856587ND
2019-08-27S8565882.25 ppm
2019-09-26S856810ND
2019-09-26S856811ND
2019-09-26S856812ND
2019-09-26S856813ND
2019-09-26S856814ND
2019-09-26S856815ND
2019-09-26S856816ND
2019-09-26S856817ND
2019-09-26S8568182.26 ppm
2019-10-22S856820ND
2019-10-22S856821ND
2019-10-22S856822ND
2019-10-22S856823ND
2019-10-22S856824ND
2019-10-22S856825ND
2019-10-22S856826ND
2019-10-22S856827ND
2019-10-22S8568282.32 ppm
2019-11-14S857370ND
2019-11-14S857371ND
2019-11-14S857372ND
2019-11-14S857373ND
2019-11-14S857374ND
2019-11-14S857375ND
2019-11-14S857376ND
2019-11-14S857377ND
2019-12-04S896162ND
2019-12-04S896163ND
2019-12-04S896164ND
2019-12-04S896165ND
2019-12-04S896166ND
2019-12-04S896167ND
2019-12-04S896168ND
2019-12-17S896169ND