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EWG's Tap Water Database — 2019 UPDATE

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Nitrate

Jefferson County PWSD 3

NOTE: Jefferson County PWSD 3 purchases water from Missouri American St. Louis County & St. Charles County which is required to test for nitrate. Sample information shown below was taken by Missouri American St. Louis County & St. Charles County.

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.

 

50

Samples

0

Samples exceeding legal limit (MCL)

47

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.756 ppm20200.250 ppm - 1.41 ppm
20130.576 ppm550.110 ppm - 1.36 ppm
20141.06 ppm10100.300 ppm - 1.97 ppm
20150.968 ppm550.430 ppm - 1.44 ppm
20161.60 ppm550.130 ppm - 3.45 ppm
20171.11 ppm550.430 ppm - 2.29 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

NOTE: Jefferson County PWSD 3 purchases water from Missouri American St. Louis County & St. Charles County which is required to test for nitrate. Sample information shown below was taken by Missouri American St. Louis County & St. Charles County.

Date Lab ID Result
2012-01-05155873011.17 ppm
2012-01-05155954010.460 ppm
2012-01-05158254010.490 ppm
2012-01-05158278011.22 ppm
2012-01-05158289011.29 ppm
2012-04-10174084010.990 ppm
2012-04-10174066011.03 ppm
2012-04-10164206011.01 ppm
2012-04-16161138010.330 ppm
2012-04-16161157010.320 ppm
2012-07-05191808011.41 ppm
2012-07-05174085011.35 ppm
2012-07-05174067011.40 ppm
2012-07-11169926010.560 ppm
2012-07-11171318010.250 ppm
2012-10-23202750010.370 ppm
2012-10-23202749010.380 ppm
2012-10-23202748010.390 ppm
2012-10-23202747010.290 ppm
2012-10-23202746010.400 ppm
2013-04-02214908010.750 ppm
2013-04-02214926011.36 ppm
2013-04-03214917010.540 ppm
2013-10-08236415010.110 ppm
2013-10-08236418010.120 ppm
2014-04-15251433010.800 ppm
2014-04-16251415010.540 ppm
2014-04-16251424010.470 ppm
2014-07-29269567010.350 ppm
2014-07-29269566010.300 ppm
2014-07-29269565011.87 ppm
2014-07-29269564011.97 ppm
2014-07-29269563011.90 ppm
2014-10-08271619011.09 ppm
2014-10-09271622011.30 ppm
2015-04-22286248010.510 ppm
2015-04-22286257010.430 ppm
2015-04-22286266011.03 ppm
2015-10-26303178011.43 ppm
2015-10-26303175011.44 ppm
2016-04-05317774010.130 ppm
2016-04-05317764010.170 ppm
2016-04-20317784013.45 ppm
2016-10-05334146012.22 ppm
2016-10-05334143012.04 ppm
2017-04-11351218012.29 ppm
2017-04-19351208010.430 ppm
2017-04-19351198010.490 ppm
2017-10-16372304011.44 ppm
2017-10-16372307010.890 ppm