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EWG's Tap Water Database — 2019 UPDATE

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Nitrate

City of Nampa

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.

 

97

Samples

0

Samples exceeding legal limit (MCL)

82

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20121.96 ppm1614ND - 6.88 ppm
20131.52 ppm1514ND - 5.40 ppm
20141.65 ppm15150.200 ppm - 6.80 ppm
20151.07 ppm1512ND - 6.70 ppm
20161.55 ppm1513ND - 6.40 ppm
20170.967 ppm2114ND - 6.20 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
2012-02-29I585925.95 ppm
2012-12-12N644884.66 ppm
2012-12-12N644871.96 ppm
2012-12-12N644866.88 ppm
2012-12-12N644852.02 ppm
2012-12-12N644842.81 ppm
2012-12-12N644830.930 ppm
2012-12-12N644820.420 ppm
2012-12-13N64539ND
2012-12-13N64538ND
2012-12-13N645370.850 ppm
2012-12-13N645360.750 ppm
2012-12-13N645350.530 ppm
2012-12-13N645341.75 ppm
2012-12-13N645321.45 ppm
2012-12-13N645330.360 ppm
2013-12-04N1351134ND
2013-12-04I13511350.900 ppm
2013-12-04I13511322.70 ppm
2013-12-04N13511362.10 ppm
2013-12-04N13511375.40 ppm
2013-12-05I13512730.900 ppm
2013-12-05N13512752.20 ppm
2013-12-12I13522830.300 ppm
2013-12-12I13522820.500 ppm
2013-12-18N13529991.80 ppm
2013-12-18N13530002.10 ppm
2013-12-19I13532481.000 ppm
2013-12-19I13532501.40 ppm
2013-12-19I13532460.400 ppm
2013-12-19I13532521.10 ppm
2014-10-29N14432790.200 ppm
2014-10-29N14432800.400 ppm
2014-10-29N14432810.800 ppm
2014-10-29N14432822.10 ppm
2014-10-29N14432836.80 ppm
2014-10-29N14432840.800 ppm
2014-10-29N14432780.800 ppm
2014-10-29N14432770.200 ppm
2014-10-29N14432761.000 ppm
2014-10-30N14432852.00 ppm
2014-10-30N14432710.700 ppm
2014-10-30N14432720.500 ppm
2014-10-30N14432735.00 ppm
2014-10-30N14432742.00 ppm
2014-10-30N14432751.40 ppm
2015-11-18N1550158ND
2015-11-18N15501570.200 ppm
2015-11-18N15501561.40 ppm
2015-11-18N15501551.000 ppm
2015-11-18N15501540.300 ppm
2015-11-18N15501671.30 ppm
2015-11-18N15501590.400 ppm
2015-11-18N15501600.900 ppm
2015-11-18N15501611.000 ppm
2015-11-18N15501621.90 ppm
2015-11-18N15501630.800 ppm
2015-11-18N15501646.70 ppm
2015-11-18N1550165ND
2015-11-18N1550166ND
2015-12-02N15517990.200 ppm
2016-11-17I16529770.200 ppm
2016-11-17I16529822.10 ppm
2016-11-17I16529936.40 ppm
2016-11-17I16529711.30 ppm
2016-11-17I16529730.900 ppm
2016-11-17I16529750.500 ppm
2016-11-17I16529850.300 ppm
2016-11-17I16529871.40 ppm
2016-11-17I16529912.80 ppm
2016-11-17I16529950.700 ppm
2016-11-17I16529890.900 ppm
2016-11-17I1652979ND
2016-11-17I16529802.90 ppm
2016-11-17I16529812.80 ppm
2016-11-17I1652984ND
2017-01-31I17038061.50 ppm
2017-04-11I1714411ND
2017-08-09I1735777ND
2017-10-18I1748773ND
2017-10-18I1748772ND
2017-10-18I17487742.00 ppm
2017-10-18I1748771ND
2017-10-18I1748772ND
2017-10-18I1748773ND
2017-10-18I17487650.400 ppm
2017-10-18I17487660.200 ppm
2017-10-18I17487631.70 ppm
2017-10-18I17487566.20 ppm
2017-10-18I17487491.000 ppm
2017-10-18I17487480.300 ppm
2017-10-18I17487552.60 ppm
2017-10-18I17487540.900 ppm
2017-10-18I17487501.40 ppm
2017-10-18I17487640.800 ppm
2017-10-27I17504850.600 ppm
2017-11-08I17523000.700 ppm