EWG's Tap Water Database — 2021 UPDATE


Nitrate and nitrite

Fort Leonard Wood

Nitrate and nitrite enter water from fertilizer runoff, septic tanks and urban runoff. These contaminants can cause oxygen deprivation for infants and increase the risk of cancer. Nitrite is significantly more toxic than nitrate. Click here to read more about nitrate.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20140.555 ppm98ND - 2.79 ppm
20150.727 ppm98ND - 3.56 ppm
20160.484 ppm98ND - 2.68 ppm
20170.540 ppm98ND - 2.53 ppm
20180.521 ppm990.0180 ppm - 2.49 ppm
20190.786 ppm10100.0130 ppm - 3.48 ppm

ppm = parts per million

State and national drinking water standards and health guidelines

EWG Health Guideline 0.14 ppm

The health guideline of 0.14 parts per million, or ppm, for nitrate and nitrite is based on the equivalent health guideline for nitrate, as defined in a peer-reviewed scientific study by EWG. This guideline represents a one-in-one-million annual cancer risk level.

EPA Maximum Contaminant
Level (MCL) 10 ppm

ppm = parts per million

All test results

Date Lab ID Result
2014-04-15AC201731.23 ppm
2014-04-15AC201740.290 ppm
2014-04-15AC201750.0940 ppm
2014-04-15AC201760.330 ppm
2014-04-15AC201770.0310 ppm
2014-04-15AC201782.79 ppm
2014-04-15AC201790.0360 ppm
2014-04-15AC201800.190 ppm
2015-01-27AC406640.250 ppm
2015-12-21AC645790.0160 ppm
2015-12-21AC645753.56 ppm
2015-12-21AC645762.08 ppm
2015-12-21AC645740.160 ppm
2015-12-21AC645770.0400 ppm
2015-12-21AC645800.290 ppm
2015-12-21AC645730.150 ppm
2016-01-11AC651840.610 ppm
2016-01-19AC653830.140 ppm
2016-01-19AC653870.120 ppm
2016-01-19AC653900.0270 ppm
2016-01-19AC653850.0360 ppm
2016-01-19AC653842.68 ppm
2016-01-19AC653860.280 ppm
2016-01-19AC653880.460 ppm
2017-01-10AC892701.50 ppm
2017-01-10AC892710.300 ppm
2017-01-10AC892660.160 ppm
2017-01-10AC892652.53 ppm
2017-01-10AC892720.110 ppm
2017-01-10AC892680.0130 ppm
2017-01-10AC892670.0250 ppm
2017-01-10AC892730.220 ppm
2018-01-09AD115390.0990 ppm
2018-01-09AD115380.0180 ppm
2018-01-09AD115372.49 ppm
2018-01-09AD115361.40 ppm
2018-01-09AD115350.260 ppm
2018-01-09AD115340.0370 ppm
2018-01-09AD115330.140 ppm
2018-01-09AD115320.0220 ppm
2018-01-28AD114980.220 ppm
2019-01-14AD378590.930 ppm
2019-01-14AD380610.310 ppm
2019-01-14AD380620.1000 ppm
2019-01-14AD380633.48 ppm
2019-01-14AD380640.0200 ppm
2019-01-14AD380650.0190 ppm
2019-01-14AD380660.160 ppm
2019-01-14AD380672.54 ppm
2019-01-14AD380680.290 ppm
2019-01-14AD380690.0130 ppm