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EWG's Tap Water Database — 2021 UPDATE

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Nitrate

City of Caldwell

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.

MORE ABOUT THIS CONTAMINANT

 

90

Samples

0

Samples exceeding legal limit (MCL)

72

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.473 ppm1511ND - 2.10 ppm
20150.520 ppm1513ND - 1.60 ppm
20160.580 ppm1511ND - 2.60 ppm
20170.567 ppm1512ND - 2.60 ppm
20180.580 ppm1513ND - 1.90 ppm
20190.633 ppm1512ND - 2.70 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
2014-08-25N1433175ND
2014-08-25N1433189ND
2014-08-25N14331880.900 ppm
2014-08-25N1433187ND
2014-08-25N14331862.10 ppm
2014-08-25N14331850.600 ppm
2014-08-25N1433184ND
2014-08-25N14331800.300 ppm
2014-08-25N14331810.300 ppm
2014-08-25N14331821.50 ppm
2014-08-25N14331830.400 ppm
2014-08-25N14331790.200 ppm
2014-08-25N14331780.300 ppm
2014-08-25N14331770.200 ppm
2014-08-25N14331760.300 ppm
2015-10-01N15422530.300 ppm
2015-10-01N15422610.200 ppm
2015-10-01N15422601.20 ppm
2015-10-01N15422590.300 ppm
2015-10-01N15422581.30 ppm
2015-10-01N15422570.600 ppm
2015-10-01N1542256ND
2015-10-01N15422550.700 ppm
2015-10-01N15422520.300 ppm
2015-10-01N15422510.300 ppm
2015-10-01N15422500.400 ppm
2015-10-01N15422490.400 ppm
2015-10-01N15422480.200 ppm
2015-10-01N1542247ND
2015-10-01N15422541.60 ppm
2016-08-10I16360480.400 ppm
2016-08-10I1636075ND
2016-08-10I16360740.300 ppm
2016-08-10I16360730.400 ppm
2016-08-10I1636072ND
2016-08-10I16360710.300 ppm
2016-08-10I1636045ND
2016-08-10I16360430.800 ppm
2016-08-10I16360420.300 ppm
2016-08-10I16360410.400 ppm
2016-08-10I16360472.60 ppm
2016-08-10I16360491.000 ppm
2016-08-10I1636050ND
2016-08-10I16360460.600 ppm
2016-08-10I16360441.60 ppm
2017-06-28I17279990.200 ppm
2017-06-28I17279980.300 ppm
2017-06-28I17279970.300 ppm
2017-06-28I17279960.300 ppm
2017-06-28I1727995ND
2017-06-28I17279940.300 ppm
2017-06-28I17279930.500 ppm
2017-06-28I17279921.70 ppm
2017-06-28I17279910.400 ppm
2017-09-06I1740609ND
2017-09-06I1740604ND
2017-09-06I17406052.60 ppm
2017-09-06I17406061.20 ppm
2017-09-06I17406070.400 ppm
2017-09-06I17406080.300 ppm
2018-07-31I18365830.300 ppm
2018-07-31I18365900.300 ppm
2018-07-31I18365910.300 ppm
2018-07-31I18365920.300 ppm
2018-07-31I18365931.90 ppm
2018-07-31I18365940.900 ppm
2018-07-31I18365950.300 ppm
2018-07-31I18365811.90 ppm
2018-07-31I18365820.600 ppm
2018-07-31I18365840.200 ppm
2018-07-31I18365850.300 ppm
2018-07-31I18365861.10 ppm
2018-07-31I1836587ND
2018-07-31I18365880.300 ppm
2018-07-31I1836589ND
2019-08-06I19385930.300 ppm
2019-08-06I19385970.600 ppm
2019-08-06I1938591ND
2019-08-06I1938595ND
2019-08-06I19385990.300 ppm
2019-08-06I19386010.200 ppm
2019-08-06I19385940.400 ppm
2019-08-19I19411810.400 ppm
2019-08-19I19411830.400 ppm
2019-08-19I19411711.20 ppm
2019-08-19I19411720.400 ppm
2019-08-19I19411742.70 ppm
2019-08-19I19411772.10 ppm
2019-08-19I19411790.500 ppm
2019-08-19I1941176ND