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EWG's Tap Water Database — 2021 UPDATE

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Nitrate

Castaic Lake Water Agency

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

 

290

Samples

0

Samples exceeding legal limit (MCL)

271

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20142.23 ppm4341ND - 4.92 ppm
20152.48 ppm4342ND - 3.84 ppm
20162.63 ppm4846ND - 4.10 ppm
20172.35 ppm5149ND - 3.90 ppm
20182.31 ppm5046ND - 4.10 ppm
20192.42 ppm5547ND - 4.40 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
2014-01-062104-003-0800ND
2014-01-062104-004-10104.92 ppm
2014-01-062104-005-10202.15 ppm
2014-01-062104-006-10402.44 ppm
2014-02-032104-003-1200ND
2014-02-032104-004-09504.86 ppm
2014-02-032104-005-10004.04 ppm
2014-02-032104-006-10154.45 ppm
2014-03-032104-003-08000.520 ppm
2014-03-032104-004-10003.46 ppm
2014-03-032104-005-10102.69 ppm
2014-03-032104-006-10503.03 ppm
2014-04-072104-003-08000.497 ppm
2014-04-072104-004-10553.28 ppm
2014-04-072104-005-11002.64 ppm
2014-04-072104-006-11202.89 ppm
2014-04-102104-002-08000.678 ppm
2014-05-052104-003-08000.542 ppm
2014-05-052104-004-10153.41 ppm
2014-05-052104-005-10252.53 ppm
2014-05-052104-006-10453.07 ppm
2014-06-022104-003-08000.497 ppm
2014-06-022104-005-10052.37 ppm
2014-06-022104-006-10252.33 ppm
2014-07-072104-003-08000.587 ppm
2014-07-072104-005-10052.62 ppm
2014-07-072104-006-10202.62 ppm
2014-08-042104-003-11050.587 ppm
2014-08-042104-005-10152.48 ppm
2014-08-042104-006-10352.48 ppm
2014-09-022104-003-09300.542 ppm
2014-09-022104-005-13202.71 ppm
2014-09-022104-006-13402.71 ppm
2014-10-202104-003-08300.474 ppm
2014-10-202104-005-10202.48 ppm
2014-10-202104-006-10402.48 ppm
2014-11-032104-003-08300.520 ppm
2014-11-032104-005-10102.48 ppm
2014-11-032104-006-10252.48 ppm
2014-12-012104-003-09000.542 ppm
2014-12-012104-004-10204.07 ppm
2014-12-012104-005-10302.48 ppm
2014-12-012104-006-10453.39 ppm
2015-01-052104-003-09000.678 ppm
2015-01-052104-004-10003.84 ppm
2015-01-052104-005-10102.48 ppm
2015-01-052104-006-10203.39 ppm
2015-02-022104-003-10100.700 ppm
2015-02-022104-004-11453.84 ppm
2015-02-022104-005-12002.48 ppm
2015-02-022104-006-12153.16 ppm
2015-03-022104-002-14500.700 ppm
2015-03-022104-004-13403.61 ppm
2015-03-022104-006-13103.61 ppm
2015-04-062104-002-10350.745 ppm
2015-04-062104-004-11353.61 ppm
2015-04-062104-006-11503.61 ppm
2015-04-092104-003-09200.836 ppm
2015-04-142104-005-13252.94 ppm
2015-05-042104-003-14300.813 ppm
2015-05-042104-004-10203.61 ppm
2015-05-042104-005-10402.48 ppm
2015-05-042104-006-10553.16 ppm
2015-06-012104-003-09100.858 ppm
2015-06-012104-004-09553.61 ppm
2015-06-012104-005-10052.48 ppm
2015-06-012104-006-10253.16 ppm
2015-07-062104-003-09100.926 ppm
2015-07-062104-004-10153.84 ppm
2015-07-062104-005-10252.48 ppm
2015-07-062104-006-10403.16 ppm
2015-08-032104-003-10350.949 ppm
2015-08-032104-004-10153.84 ppm
2015-08-032104-005-15453.39 ppm
2015-08-032104-006-1525ND
2015-10-052104-003-08450.474 ppm
2015-10-052104-004-10153.61 ppm
2015-10-052104-006-14053.61 ppm
2015-11-022104-003-09150.490 ppm
2015-11-022104-004-10053.70 ppm
2015-11-022104-005-10152.70 ppm
2015-11-022104-006-10353.20 ppm
2015-12-072104-003-08360.580 ppm
2015-12-072104-004-10253.60 ppm
2015-12-072104-005-10352.70 ppm
2015-12-072104-006-10503.10 ppm
2016-01-042104-003-09100.700 ppm
2016-01-042104-004-10303.80 ppm
2016-01-042104-005-10402.80 ppm
2016-01-042104-006-11003.30 ppm
2016-02-082104-002-10200.700 ppm
2016-02-082104-004-11554.10 ppm
2016-02-082104-005-12103.10 ppm
2016-02-082104-006-12203.50 ppm
2016-03-072104-003-09300.600 ppm
2016-03-072104-004-10353.50 ppm
2016-03-072104-005-10452.70 ppm
2016-03-072104-006-11053.10 ppm
2016-04-112104-004-10353.80 ppm
2016-04-112104-005-10452.90 ppm
2016-04-112104-006-11053.40 ppm
2016-04-182104-003-14501.30 ppm
2016-05-022104-003-09000.770 ppm
2016-05-022104-004-10353.60 ppm
2016-05-022104-005-10452.80 ppm
2016-05-022104-006-11003.20 ppm
2016-06-062104-003-09000.830 ppm
2016-06-062104-004-10253.60 ppm
2016-06-062104-005-10352.90 ppm
2016-06-062104-006-10503.20 ppm
2016-07-052104-003-10300.840 ppm
2016-07-052104-004-12403.60 ppm
2016-07-052104-005-12502.80 ppm
2016-07-052104-006-13103.20 ppm
2016-08-012104-003-09450.820 ppm
2016-08-012104-004-10253.50 ppm
2016-08-012104-005-10352.80 ppm
2016-08-012104-006-10553.20 ppm
2016-09-062104-003-08450.890 ppm
2016-09-062104-004-12153.90 ppm
2016-09-062104-005-12253.00 ppm
2016-09-062104-006-12453.40 ppm
2016-10-032104-003-09050.860 ppm
2016-10-032104-004-10303.80 ppm
2016-10-032104-005-10402.90 ppm
2016-10-032104-006-10553.20 ppm
2016-11-072104-003-0900ND
2016-11-072104-004-12103.50 ppm
2016-11-072104-005-12202.70 ppm
2016-11-072104-006-12453.10 ppm
2016-12-052104-003-1210ND
2016-12-052104-004-10353.70 ppm
2016-12-052104-005-10452.90 ppm
2016-12-052104-006-10553.30 ppm
2017-01-092104-004-10303.80 ppm
2017-01-092104-005-10453.00 ppm
2017-01-092104-006-11003.40 ppm
2017-01-112104-003-1100ND
2017-02-062104-003-10200.540 ppm
2017-02-062104-004-11303.70 ppm
2017-02-062104-005-11352.90 ppm
2017-02-062104-006-11503.30 ppm
2017-03-062104-003-08400.520 ppm
2017-03-062104-004-10153.60 ppm
2017-03-062104-005-10252.80 ppm
2017-03-062104-006-10453.20 ppm
2017-04-102104-003-08400.770 ppm
2017-04-102104-004-10353.80 ppm
2017-04-102104-005-10453.10 ppm
2017-04-102104-006-11253.50 ppm
2017-05-012104-003-08300.770 ppm
2017-05-012104-004-10303.80 ppm
2017-05-012104-005-10403.00 ppm
2017-05-012104-006-11103.40 ppm
2017-06-052104-002-10100.580 ppm
2017-06-052104-003-09200.570 ppm
2017-06-052104-003-10100.580 ppm
2017-06-052104-004-11003.70 ppm
2017-06-052104-005-11152.80 ppm
2017-06-052104-006-11503.30 ppm
2017-07-102104-002-10000.800 ppm
2017-07-102104-003-09450.810 ppm
2017-07-102104-004-11003.60 ppm
2017-07-102104-005-11102.80 ppm
2017-07-102104-006-11353.30 ppm
2017-08-072104-002-07450.660 ppm
2017-08-072104-003-10150.650 ppm
2017-08-072104-004-08453.70 ppm
2017-08-072104-005-08552.80 ppm
2017-08-072104-006-09153.20 ppm
2017-09-112104-002-10050.660 ppm
2017-09-112104-003-10000.660 ppm
2017-09-112104-004-11053.50 ppm
2017-09-112104-005-11152.60 ppm
2017-09-112104-006-14453.10 ppm
2017-10-022104-003-09350.650 ppm
2017-10-022104-005-10152.80 ppm
2017-10-022104-006-10302.80 ppm
2017-11-062104-003-09000.520 ppm
2017-11-062104-004-10403.90 ppm
2017-11-062104-005-10502.80 ppm
2017-11-062104-006-11153.30 ppm
2017-12-042104-003-0830ND
2017-12-042104-005-10202.80 ppm
2017-12-042104-006-10352.80 ppm
2018-01-082104-003-0830ND
2018-01-082104-004-10103.90 ppm
2018-01-082104-005-10202.80 ppm
2018-01-082104-006-10453.40 ppm
2018-02-052104-003-08450.480 ppm
2018-03-012104-003-08250.460 ppm
2018-03-052104-004-14254.10 ppm
2018-03-052104-005-14353.00 ppm
2018-03-052104-006-14503.60 ppm
2018-04-022104-002-09550.470 ppm
2018-04-022104-003-08500.880 ppm
2018-04-022104-004-11003.90 ppm
2018-04-022104-006-11354.00 ppm
2018-05-072104-003-10200.470 ppm
2018-05-072104-004-10154.00 ppm
2018-05-072104-005-10253.00 ppm
2018-05-072104-006-10553.50 ppm
2018-06-042104-003-09100.470 ppm
2018-06-042104-004-10253.80 ppm
2018-06-042104-006-10403.30 ppm
2018-06-072104-005-10102.90 ppm
2018-07-092104-002-09300.650 ppm
2018-07-092104-003-09300.710 ppm
2018-07-092104-004-10004.10 ppm
2018-07-092104-005-09252.90 ppm
2018-07-092104-006-09402.90 ppm
2018-08-062104-002-10250.520 ppm
2018-08-062104-003-08300.560 ppm
2018-08-062104-004-11253.80 ppm
2018-08-062104-005-11352.90 ppm
2018-08-062104-006-11503.30 ppm
2018-09-102104-002-0920ND
2018-09-102104-003-09000.490 ppm
2018-09-102104-004-10203.60 ppm
2018-09-102104-005-10302.80 ppm
2018-09-102104-006-10453.10 ppm
2018-10-082104-002-09450.470 ppm
2018-10-082104-003-08450.560 ppm
2018-10-082104-004-10553.70 ppm
2018-10-082104-005-11102.80 ppm
2018-10-082104-006-11303.30 ppm
2018-11-052104-002-0945ND
2018-11-052104-003-08450.530 ppm
2018-11-052104-004-10453.60 ppm
2018-11-052104-005-10552.70 ppm
2018-11-052104-006-11103.20 ppm
2018-12-032104-002-0945ND
2018-12-032104-004-10403.80 ppm
2018-12-032104-005-10502.90 ppm
2018-12-032104-006-11053.40 ppm
2019-01-072104-002-1015ND
2019-01-072104-004-11104.00 ppm
2019-01-072104-005-11203.10 ppm
2019-01-072104-006-11353.60 ppm
2019-02-112104-004-11204.10 ppm
2019-02-112104-005-11303.10 ppm
2019-02-112104-006-11503.60 ppm
2019-03-042104-002-10000.540 ppm
2019-03-042104-004-11004.10 ppm
2019-03-042104-005-11103.10 ppm
2019-03-042104-006-11303.60 ppm
2019-04-012104-002-08050.480 ppm
2019-04-012104-003-1015ND
2019-04-012104-004-11053.90 ppm
2019-04-012104-005-11153.10 ppm
2019-04-012104-006-11353.50 ppm
2019-05-062104-002-0945ND
2019-05-062104-003-08300.470 ppm
2019-05-062104-004-10353.90 ppm
2019-05-062104-005-10453.10 ppm
2019-05-062104-006-11003.50 ppm
2019-06-032104-002-1015ND
2019-06-032104-003-09050.470 ppm
2019-06-032104-004-11204.00 ppm
2019-06-032104-005-11303.10 ppm
2019-06-032104-006-11453.60 ppm
2019-07-082104-002-10050.460 ppm
2019-07-082104-003-08300.490 ppm
2019-07-082104-004-11153.90 ppm
2019-07-082104-005-11203.10 ppm
2019-07-082104-006-11403.60 ppm
2019-08-052104-002-09500.470 ppm
2019-08-052104-003-09100.520 ppm
2019-08-052104-004-10454.40 ppm
2019-08-052104-005-10553.10 ppm
2019-08-052104-006-11153.20 ppm
2019-09-092104-002-1110ND
2019-09-092104-003-08300.480 ppm
2019-09-092104-004-12053.90 ppm
2019-09-092104-005-12103.00 ppm
2019-09-092104-006-12453.50 ppm
2019-10-072104-002-10240.450 ppm
2019-10-072104-003-08550.510 ppm
2019-10-072104-004-11044.10 ppm
2019-10-072104-005-11223.20 ppm
2019-10-072104-006-11463.60 ppm
2019-11-042104-002-1000ND
2019-11-042104-003-0950ND
2019-11-042104-004-11054.10 ppm
2019-11-042104-005-11103.20 ppm
2019-11-042104-006-11253.70 ppm
2019-12-022104-004-10203.80 ppm
2019-12-022104-005-10303.00 ppm
2019-12-022104-006-11003.50 ppm
2019-12-042104-002-1010ND