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EWG's Tap Water Database — 2021 UPDATE

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Nitrate and nitrite

Garrison Lake Pump District

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.

MORE ABOUT THIS CONTAMINANT

 

96

Samples

0

Samples exceeding legal limit (MCL)

78

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20144.51 ppm1613ND - 5.70 ppm
20154.97 ppm1613ND - 8.90 ppm
20165.81 ppm1613ND - 9.10 ppm
20175.13 ppm1613ND - 6.80 ppm
20184.95 ppm1612ND - 7.70 ppm
20195.36 ppm1614ND - 7.78 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
2014-01-15S5074525.60 ppm
2014-02-21S5320775.70 ppm
2014-02-28S4790485.70 ppm
2014-02-28S479047ND
2014-03-17S5325195.70 ppm
2014-04-08S479129ND
2014-04-08S470957ND
2014-04-22S5533045.60 ppm
2014-05-07S5627285.40 ppm
2014-06-11S5628835.50 ppm
2014-07-23S5631865.40 ppm
2014-08-26S5731845.60 ppm
2014-09-10S5732985.60 ppm
2014-10-20S5734005.50 ppm
2014-11-13S5883905.50 ppm
2014-12-03S5893325.40 ppm
2015-01-05S5894045.40 ppm
2015-02-04S6030155.40 ppm
2015-03-11S6038665.20 ppm
2015-04-13S479018ND
2015-04-13S4790175.10 ppm
2015-04-20S6078274.80 ppm
2015-05-11S6166335.20 ppm
2015-05-27S612404ND
2015-05-27S612403ND
2015-06-09S6170635.10 ppm
2015-07-23S6401647.20 ppm
2015-08-14S6320928.90 ppm
2015-09-02S6406336.80 ppm
2015-10-14S6291376.90 ppm
2015-11-03S6291486.80 ppm
2015-12-09S6431546.70 ppm
2016-01-06S6291618.90 ppm
2016-01-28S602110ND
2016-01-28S6020989.00 ppm
2016-01-28S602111ND
2016-01-28S602112ND
2016-02-02S6432419.10 ppm
2016-03-14S6291636.70 ppm
2016-04-20S6402917.30 ppm
2016-05-17S6598986.80 ppm
2016-06-16S6598856.80 ppm
2016-07-14S6599066.50 ppm
2016-08-11S6716186.30 ppm
2016-09-21S6796226.00 ppm
2016-10-11S6716987.00 ppm
2016-11-15S6796336.20 ppm
2016-12-13S6796386.30 ppm
2017-01-18S6793846.60 ppm
2017-02-10S6797406.30 ppm
2017-02-10S6288796.20 ppm
2017-02-10S628878ND
2017-02-10S628877ND
2017-02-10S628875ND
2017-03-07S6146786.30 ppm
2017-04-07S6715516.60 ppm
2017-05-19S6146076.80 ppm
2017-06-14S6599116.30 ppm
2017-07-06S6943496.30 ppm
2017-08-10S6714066.10 ppm
2017-09-18S6597036.10 ppm
2017-10-19S6703136.00 ppm
2017-11-15S7576756.30 ppm
2017-12-13S7576796.10 ppm
2018-01-19S6715327.70 ppm
2018-01-31S730859ND
2018-01-31S730858ND
2018-02-02S790035ND
2018-02-05S769472ND
2018-02-26S6598666.60 ppm
2018-03-23S7340126.80 ppm
2018-04-17S6715386.22 ppm
2018-05-17S6599186.34 ppm
2018-06-21S6598676.83 ppm
2018-07-26S7594906.43 ppm
2018-08-03S7594886.22 ppm
2018-09-21S7594956.47 ppm
2018-10-23S8125446.45 ppm
2018-11-08S8125516.68 ppm
2018-12-10S8170496.51 ppm
2019-01-24S7596796.62 ppm
2019-02-12S8170676.30 ppm
2019-02-12S817066ND
2019-02-22S7596446.15 ppm
2019-03-14S817085ND
2019-03-14S7596346.11 ppm
2019-04-04S7596876.52 ppm
2019-05-02S7596997.16 ppm
2019-06-06S7592855.73 ppm
2019-07-09S7597145.56 ppm
2019-07-23S8480455.63 ppm
2019-08-06S7597335.67 ppm
2019-09-12S7597085.89 ppm
2019-10-02S7593547.78 ppm
2019-11-07S7593574.93 ppm
2019-12-13S7593615.63 ppm