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EWG's Tap Water Database — 2019 UPDATE

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Nitrate

City of Lewiston

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.

 

39

Samples

0

Samples exceeding legal limit (MCL)

26

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20121.28 ppm43ND - 3.54 ppm
20131.51 ppm75ND - 6.63 ppm
20140.872 ppm64ND - 2.20 ppm
20150.958 ppm75ND - 4.30 ppm
20160.951 ppm64ND - 2.31 ppm
20171.12 ppm97ND - 3.97 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
2012-04-03N592543.54 ppm
2012-04-03I592550.680 ppm
2012-08-15I62177ND
2012-08-15I621780.900 ppm
2013-02-27N130228026-0020.924 ppm
2013-02-27I130228026-0010.653 ppm
2013-06-05I130606050-0016.63 ppm
2013-06-05I130606050-002ND
2013-08-21I130822058-0012.22 ppm
2013-08-21I130822058-005ND
2013-08-21I130822058-0040.152 ppm
2014-02-25I140226039-0010.592 ppm
2014-02-25I140226039-0020.581 ppm
2014-06-03I140604041-002ND
2014-06-03I140604041-0011.86 ppm
2014-08-13I140814054-0042.20 ppm
2014-08-13I140814054-005ND
2015-02-10N150211018-0010.404 ppm
2015-02-10N150211018-0020.163 ppm
2015-04-21I150422037-001ND
2015-06-10I150611032-0024.30 ppm
2015-06-10I150611032-0010.116 ppm
2015-07-22I150723044-0011.72 ppm
2015-07-22I150723044-003ND
2016-02-09I160209050-0011.40 ppm
2016-02-09I160209050-0020.995 ppm
2016-04-06I160407008-0012.31 ppm
2016-04-06I160407008-003ND
2016-08-24N160624071-001ND
2016-08-24N160824071-0021.000 ppm
2017-03-28I170328050-0010.367 ppm
2017-03-28I170328050-0020.117 ppm
2017-10-25I171026026-001ND
2017-10-25I171026026-0020.254 ppm
2017-10-25I171026026-0032.33 ppm
2017-11-07N171108034-002ND
2017-11-07N171108034-0042.27 ppm
2017-11-07N171108034-0030.793 ppm
2017-11-07N171108034-0013.97 ppm