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EWG's Tap Water Database — 2019 UPDATE

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Nitrate

Waterloo Water Works

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.

 

178

Samples

1

Samples exceeding legal limit (MCL)

176

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20126.14 ppm34340.910 ppm - 8.75 ppm
20136.19 ppm33330.573 ppm - 8.49 ppm
20145.59 ppm33330.500 ppm - 8.20 ppm
20156.33 ppm32321.65 ppm - 10.7 ppm
20165.53 ppm2322ND - 8.30 ppm
20175.71 ppm2322ND - 8.00 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
2012-01-0318777404.26 ppm
2012-01-0318777416.56 ppm
2012-01-0318777426.29 ppm
2012-01-0318777434.03 ppm
2012-01-0318777445.30 ppm
2012-02-0118825624.60 ppm
2012-03-0118877786.83 ppm
2012-03-2818938778.14 ppm
2012-04-0218949275.24 ppm
2012-04-0218949288.40 ppm
2012-04-0218949298.10 ppm
2012-04-0218949304.96 ppm
2012-04-0218949313.38 ppm
2012-04-0218949326.92 ppm
2012-04-0218949331.74 ppm
2012-04-0218949348.75 ppm
2012-04-0218949350.910 ppm
2012-05-0119000296.44 ppm
2012-06-0419067938.46 ppm
2012-07-1119140286.50 ppm
2012-07-1119140298.00 ppm
2012-07-1119140307.88 ppm
2012-07-1119140314.58 ppm
2012-07-1119140326.18 ppm
2012-07-1119140337.76 ppm
2012-08-0119196387.02 ppm
2012-09-0419274127.67 ppm
2012-10-0219353584.51 ppm
2012-10-0219353595.54 ppm
2012-10-0219353606.10 ppm
2012-10-0219353555.56 ppm
2012-10-0219353567.32 ppm
2012-10-0219353577.44 ppm
2012-11-0119402467.24 ppm
2013-01-0219516916.57 ppm
2013-01-0219516928.31 ppm
2013-01-0219516938.31 ppm
2013-01-0219516944.86 ppm
2013-01-0219516956.29 ppm
2013-03-2019662517.42 ppm
2013-04-0219687445.18 ppm
2013-04-0219687458.33 ppm
2013-04-0219687468.46 ppm
2013-04-0219687474.52 ppm
2013-04-0219687483.19 ppm
2013-04-0219687496.17 ppm
2013-04-0219687501.18 ppm
2013-04-0219687517.96 ppm
2013-04-0219687520.573 ppm
2013-05-0219741218.13 ppm
2013-06-0519807536.42 ppm
2013-07-1119876855.71 ppm
2013-07-1119876867.41 ppm
2013-07-1119876877.32 ppm
2013-07-1119876884.46 ppm
2013-07-1119876896.13 ppm
2013-07-1119876907.18 ppm
2013-08-0719943756.99 ppm
2013-09-0520025037.83 ppm
2013-10-0220081896.39 ppm
2013-10-0220081907.88 ppm
2013-10-0220081918.31 ppm
2013-10-0220081925.52 ppm
2013-10-0220081934.50 ppm
2013-10-0220081948.49 ppm
2013-11-0720153151.56 ppm
2013-12-0420204446.78 ppm
2014-01-0820260105.02 ppm
2014-01-0820260117.64 ppm
2014-01-0820260127.27 ppm
2014-01-0820260134.28 ppm
2014-01-0820260146.15 ppm
2014-01-0820260157.73 ppm
2014-02-0520311776.74 ppm
2014-03-0620370443.51 ppm
2014-04-0220420635.23 ppm
2014-04-0220420646.65 ppm
2014-04-0220420657.06 ppm
2014-04-0220420663.69 ppm
2014-04-0220420673.13 ppm
2014-04-0220420683.69 ppm
2014-04-0220420690.500 ppm
2014-04-0220420707.05 ppm
2014-04-0220420710.984 ppm
2014-05-0120473487.70 ppm
2014-06-0520539582.16 ppm
2014-07-0920608225.66 ppm
2014-07-0920608237.18 ppm
2014-07-0920608247.58 ppm
2014-07-0920608254.37 ppm
2014-07-0920608264.58 ppm
2014-07-0920608277.68 ppm
2014-08-1320698408.20 ppm
2014-09-0420749567.72 ppm
2014-10-0220819305.24 ppm
2014-10-0220819316.79 ppm
2014-10-0220819326.87 ppm
2014-10-0220819333.87 ppm
2014-10-0220819345.95 ppm
2014-10-0220819356.61 ppm
2015-01-08310-46942-54.32 ppm
2015-01-08310-46942-43.22 ppm
2015-01-08310-46942-35.35 ppm
2015-01-08310-46942-25.45 ppm
2015-01-08310-46942-14.33 ppm
2015-02-20310-49537-18.64 ppm
2015-03-05310-50294-18.88 ppm
2015-04-01310-52170-91.65 ppm
2015-04-01310-52170-72.60 ppm
2015-04-01310-52170-67.78 ppm
2015-04-01310-52170-53.20 ppm
2015-04-01310-52170-45.15 ppm
2015-04-01310-52170-38.85 ppm
2015-04-01310-52170-28.65 ppm
2015-04-01310-52170-16.46 ppm
2015-04-01310-52170-88.88 ppm
2015-05-07310-54973-18.27 ppm
2015-06-03310-56818-16.31 ppm
2015-07-08310-59376-16.84 ppm
2015-07-08310-59376-29.13 ppm
2015-07-08310-59376-69.40 ppm
2015-07-08310-59376-45.25 ppm
2015-07-08310-59376-58.03 ppm
2015-07-08310-59376-34.11 ppm
2015-08-06310-61371-18.33 ppm
2015-09-02310-63299-18.39 ppm
2015-10-08310-66123-13.02 ppm
2015-10-08310-66123-23.33 ppm
2015-10-08310-66123-36.71 ppm
2015-10-08310-66123-45.32 ppm
2015-10-08310-66123-55.89 ppm
2015-11-05310-68284-110.7 ppm
2016-01-052A60047-015.20 ppm
2016-01-052A60047-027.60 ppm
2016-01-052A60047-037.60 ppm
2016-01-052A60047-043.70 ppm
2016-01-052A60047-056.60 ppm
2016-04-052D60071-067.10 ppm
2016-04-052D60071-052.20 ppm
2016-04-052D60071-015.30 ppm
2016-04-052D60071-028.10 ppm
2016-04-052D60071-03ND
2016-04-052D60071-048.30 ppm
2016-04-052D60071-071.60 ppm
2016-04-272D60710-013.60 ppm
2016-07-062G60113-056.80 ppm
2016-07-062G60113-014.70 ppm
2016-07-062G60113-027.00 ppm
2016-07-062G60113-037.60 ppm
2016-07-062G60113-043.80 ppm
2016-10-052J60204-056.70 ppm
2016-10-052J60204-015.70 ppm
2016-10-052J60204-026.90 ppm
2016-10-052J60204-037.20 ppm
2016-10-052J60204-044.00 ppm
2017-01-042A70075-057.60 ppm
2017-01-042A70075-043.90 ppm
2017-01-042A70075-038.00 ppm
2017-01-042A70075-027.40 ppm
2017-01-042A70075-015.50 ppm
2017-04-052D70174-043.80 ppm
2017-04-052D70174-056.80 ppm
2017-04-052D70175-01ND
2017-04-052D70175-022.20 ppm
2017-04-052D70175-032.10 ppm
2017-04-052D70174-016.00 ppm
2017-04-052D70174-027.20 ppm
2017-04-052D70174-037.50 ppm
2017-07-112G70200-015.90 ppm
2017-07-112G70200-027.50 ppm
2017-07-112G70200-037.80 ppm
2017-07-112G70200-043.90 ppm
2017-07-112G70200-057.10 ppm
2017-10-042J70188-056.90 ppm
2017-10-042J70188-037.40 ppm
2017-10-042J70188-027.30 ppm
2017-10-042J70188-015.60 ppm
2017-10-042J70188-043.90 ppm