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EWG's Tap Water Database — 2021 UPDATE

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Nitrate

California Water Service Company - Dominguez

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

 

73

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.000402 ppm91ND - 0.00361 ppm
2015ND90ND
2016ND120ND
2017ND120ND
2018ND130ND
20190.0242 ppm181ND - 0.435 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
2014-01-225701-023-1305ND
2014-05-215701-036-13300.00361 ppm
2014-07-165701-050-1130ND
2014-08-275810-016-1310ND
2014-09-245701-016-1407ND
2014-09-245701-004-1155ND
2014-10-015701-018-1140ND
2014-10-085810-019-1022ND
2014-11-069590-022-1341ND
2015-01-285701-023-1345ND
2015-03-185701-024-1042ND
2015-03-259590-018-1355ND
2015-05-205701-036-1102ND
2015-07-225701-050-1322ND
2015-08-195701-019-1230ND
2015-09-235701-004-1427ND
2015-12-239590-022-1050ND
2015-12-299590-016-1150ND
2016-01-135810-023-1320ND
2016-01-275701-023-1308ND
2016-03-239590-018-1340ND
2016-05-115810-036-1140ND
2016-07-135810-050-1335ND
2016-08-175701-018-1319ND
2016-09-075810-004-1300ND
2016-12-145701-004-1245ND
2016-12-215810-004-1110ND
2016-12-215810-016-1300ND
2016-12-289590-019-0930ND
2016-12-285810-019-1005ND
2017-01-185701-023-1020ND
2017-03-089590-019-1430ND
2017-05-175701-036-0940ND
2017-07-125701-050-1021ND
2017-08-025701-018-1100ND
2017-08-235810-019-1100ND
2017-08-235701-004-1230ND
2017-08-235810-016-1212ND
2017-09-145701-016-1410ND
2017-10-119590-036-1335ND
2017-10-169590-805-1030ND
2017-12-265810-024-1315ND
2018-01-175701-023-1210ND
2018-03-215701-024-1050ND
2018-05-015701-036-1320ND
2018-06-019590-050-0915ND
2018-08-015701-050-1035ND
2018-08-085810-018-1130ND
2018-08-109590-018-1030ND
2018-08-285701-019-1515ND
2018-09-245701-004-1522ND
2018-12-045701-016-1210ND
2018-12-045810-016-1205ND
2018-12-045701-022-1115ND
2018-12-045810-022-1120ND
2019-01-095810-023-1100ND
2019-02-219590-065-1345ND
2019-03-205810-024-1210ND
2019-05-225810-036-1415ND
2019-07-175810-050-1243ND
2019-08-285701-018-1100ND
2019-08-285701-019-0900ND
2019-09-235810-004-1340ND
2019-09-255701-016-13000.435 ppm
2019-10-309590-036-1055ND
2019-10-309590-004-1435ND
2019-11-069590-036-1000ND
2019-11-069590-004-1254ND
2019-11-139590-036-1520ND
2019-11-139590-004-1100ND
2019-11-209590-004-1326ND
2019-11-209590-036-1042ND
2019-12-175701-022-1350ND