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EWG's Tap Water Database — 2021 UPDATE

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Nitrate

Alameda County Water District

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

 

96

Samples

0

Samples exceeding legal limit (MCL)

32

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND150ND
2015ND170ND
20160.317 ppm169ND - 0.978 ppm
20170.308 ppm168ND - 0.910 ppm
20180.380 ppm168ND - 1.16 ppm
20190.309 ppm167ND - 1.49 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
2014-03-045401-038-0925ND
2014-03-045401-053-0955ND
2014-03-045401-041-0930ND
2014-03-045401-040-0845ND
2014-04-295401-053-1025ND
2014-04-295401-038-1005ND
2014-04-295401-041-1000ND
2014-07-215401-041-0955ND
2014-07-215401-038-0955ND
2014-07-225401-053-0905ND
2014-07-225401-040-0925ND
2014-10-145401-053-1145ND
2014-10-145401-038-1000ND
2014-10-145401-040-0900ND
2014-10-145401-041-1025ND
2015-01-275401-038-0955ND
2015-01-275401-053-1047ND
2015-01-275401-041-0945ND
2015-01-275401-040-1015ND
2015-04-215401-038-0945ND
2015-04-215401-040-0910ND
2015-04-215401-053-1010ND
2015-04-215401-041-0935ND
2015-06-095401-015-1120ND
2015-07-065401-038-1000ND
2015-07-065401-041-0921ND
2015-07-065401-040-1105ND
2015-07-215401-053-0905ND
2015-10-205401-041-1025ND
2015-10-205401-038-1035ND
2015-10-205401-053-1115ND
2015-10-205401-040-0940ND
2016-01-195401-040-10350.978 ppm
2016-01-195401-038-08550.400 ppm
2016-01-195401-041-09100.400 ppm
2016-01-195401-053-09350.496 ppm
2016-04-265401-040-09450.618 ppm
2016-04-265401-038-1035ND
2016-04-265401-041-1025ND
2016-05-105401-053-09150.571 ppm
2016-07-115401-041-0820ND
2016-07-115401-038-0850ND
2016-07-195401-040-0825ND
2016-07-195401-053-09550.592 ppm
2016-10-045401-053-09250.592 ppm
2016-10-045401-041-0855ND
2016-10-045401-040-0825ND
2016-10-045401-038-09050.419 ppm
2017-01-175401-053-10250.582 ppm
2017-01-175401-041-0925ND
2017-01-175401-040-09370.910 ppm
2017-01-175401-038-09250.430 ppm
2017-04-185401-041-0910ND
2017-04-185401-053-09480.603 ppm
2017-04-185401-038-0925ND
2017-04-185401-040-0820ND
2017-07-175401-038-10300.505 ppm
2017-07-175401-041-1005ND
2017-07-255401-053-10320.685 ppm
2017-07-255401-040-0915ND
2017-10-035401-053-09580.710 ppm
2017-10-035401-041-0925ND
2017-10-035401-040-0857ND
2017-10-035401-038-09150.503 ppm
2018-01-165401-053-10500.629 ppm
2018-01-165401-040-09201.16 ppm
2018-01-165401-038-1110ND
2018-01-165401-041-1025ND
2018-04-175401-040-08350.565 ppm
2018-04-175401-053-10030.934 ppm
2018-04-175401-038-09260.659 ppm
2018-04-175401-041-0939ND
2018-07-115401-041-0755ND
2018-07-115401-038-07260.850 ppm
2018-07-175401-040-0850ND
2018-07-175401-053-08450.650 ppm
2018-10-165401-053-10350.640 ppm
2018-10-165401-040-0820ND
2018-10-165401-038-0950ND
2018-10-165401-041-1005ND
2019-02-055401-041-0930ND
2019-02-055401-053-10000.600 ppm
2019-02-055401-038-0940ND
2019-02-055401-040-08201.49 ppm
2019-05-135401-053-09550.590 ppm
2019-05-145401-041-0915ND
2019-05-145401-040-0815ND
2019-05-145401-038-09000.450 ppm
2019-07-165401-053-10300.590 ppm
2019-07-165401-041-1000ND
2019-07-165401-038-09350.620 ppm
2019-07-165401-040-0755ND
2019-10-155401-053-10000.600 ppm
2019-10-155401-041-0910ND
2019-10-155401-040-0825ND
2019-10-155401-038-0925ND