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EWG's Tap Water Database — 2021 UPDATE

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Nitrate

Desert 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

 

156

Samples

0

Samples exceeding legal limit (MCL)

142

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.12 ppm3128ND - 4.07 ppm
20151.13 ppm2925ND - 3.84 ppm
20161.28 ppm2827ND - 4.50 ppm
20171.04 ppm24240.400 ppm - 3.40 ppm
20180.831 ppm2218ND - 3.20 ppm
20190.819 ppm2220ND - 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
2014-02-053761-018-09002.94 ppm
2014-02-123761-046-09303.16 ppm
2014-02-193761-045-11300.745 ppm
2014-03-193761-020-1030ND
2014-05-143761-019-09551.47 ppm
2014-05-143761-022-11201.63 ppm
2014-05-143761-028-11500.904 ppm
2014-05-143761-039-10300.452 ppm
2014-05-143761-043-10551.08 ppm
2014-05-283761-026-10400.587 ppm
2014-05-283761-031-11550.497 ppm
2014-06-043761-008-09201.27 ppm
2014-06-043761-010-11100.655 ppm
2014-06-043761-017-08503.84 ppm
2014-06-043761-029-12150.655 ppm
2014-06-183761-033-11500.678 ppm
2014-06-183761-034-10304.07 ppm
2014-06-253761-060-10450.858 ppm
2014-07-023761-025-10100.565 ppm
2014-07-023761-026-11501.22 ppm
2014-07-023761-027-11500.678 ppm
2014-07-023761-032-11150.542 ppm
2014-07-023761-038-11150.949 ppm
2014-07-093761-023-1045ND
2014-07-233761-015-0930ND
2014-07-233761-030-08300.768 ppm
2014-07-233761-040-10400.633 ppm
2014-07-303761-024-10150.565 ppm
2014-07-303761-044-11451.17 ppm
2014-08-203761-037-10301.15 ppm
2014-09-173761-047-10150.858 ppm
2015-02-043761-045-09152.48 ppm
2015-02-113761-018-00002.94 ppm
2015-02-113761-046-00002.94 ppm
2015-03-253761-020-1115ND
2015-05-063761-019-09451.13 ppm
2015-05-063761-022-12451.65 ppm
2015-05-063761-026-12200.949 ppm
2015-05-063761-028-11150.836 ppm
2015-05-063761-039-1010ND
2015-05-063761-043-10351.08 ppm
2015-05-273761-031-09150.565 ppm
2015-06-033761-010-11500.745 ppm
2015-06-033761-017-11003.84 ppm
2015-06-033761-033-09300.700 ppm
2015-06-243761-034-10303.16 ppm
2015-06-259590-008-10251.76 ppm
2015-07-083761-025-10450.542 ppm
2015-07-083761-038-09300.836 ppm
2015-07-083761-044-10051.08 ppm
2015-07-153761-030-09450.949 ppm
2015-07-223761-015-1100ND
2015-07-223761-023-1010ND
2015-07-223761-024-09450.452 ppm
2015-07-223761-027-09300.520 ppm
2015-07-223761-029-09200.565 ppm
2015-07-223761-040-10000.565 ppm
2015-07-293761-032-09200.587 ppm
2015-08-263761-037-09401.15 ppm
2015-09-233761-047-10000.836 ppm
2016-05-043761-043-10301.10 ppm
2016-05-043761-060-09351.20 ppm
2016-05-113761-015-10150.460 ppm
2016-05-113761-022-10451.90 ppm
2016-05-113761-026-11250.780 ppm
2016-05-183761-029-10301.10 ppm
2016-05-183761-030-11000.720 ppm
2016-06-083761-024-10150.500 ppm
2016-06-083761-044-09451.10 ppm
2016-06-153761-033-00000.730 ppm
2016-06-223761-008-09452.00 ppm
2016-06-223761-017-11454.50 ppm
2016-06-223761-018-11153.10 ppm
2016-06-223761-046-10302.60 ppm
2016-06-293761-040-11300.640 ppm
2016-07-133761-010-11150.890 ppm
2016-07-133761-020-1200ND
2016-07-133761-025-09300.550 ppm
2016-07-203761-039-11100.400 ppm
2016-07-213761-031-10250.560 ppm
2016-07-273761-027-10150.730 ppm
2016-08-173761-034-09503.40 ppm
2016-08-173761-038-11000.840 ppm
2016-09-073761-028-11000.960 ppm
2016-09-073761-032-09300.630 ppm
2016-09-073761-047-10100.810 ppm
2016-09-293761-019-09352.60 ppm
2016-09-293761-045-09251.000 ppm
2017-05-243761-022-11151.70 ppm
2017-05-243761-026-11500.710 ppm
2017-05-243761-030-10450.900 ppm
2017-05-313761-019-08351.000 ppm
2017-06-073761-033-10100.720 ppm
2017-06-073761-034-11153.40 ppm
2017-06-073761-040-10400.680 ppm
2017-06-073761-044-12001.000 ppm
2017-06-143761-031-09450.490 ppm
2017-07-123761-024-09300.510 ppm
2017-07-123761-025-10100.510 ppm
2017-07-123761-043-10001.10 ppm
2017-07-193761-039-10000.470 ppm
2017-07-263761-037-10001.20 ppm
2017-07-263761-046-11152.10 ppm
2017-08-023761-029-09550.660 ppm
2017-08-023761-038-09250.900 ppm
2017-08-163761-015-10450.440 ppm
2017-08-163761-027-11200.640 ppm
2017-09-203761-032-09400.780 ppm
2017-09-203761-045-11302.70 ppm
2017-09-203761-047-10300.890 ppm
2017-11-083761-028-11300.960 ppm
2017-12-133761-060-10000.400 ppm
2018-05-023761-022-10001.60 ppm
2018-05-093761-030-11150.990 ppm
2018-05-163761-015-11300.440 ppm
2018-05-163761-019-1135ND
2018-05-163761-026-11000.720 ppm
2018-05-163761-027-10400.540 ppm
2018-05-163761-029-10200.700 ppm
2018-05-163761-031-11000.490 ppm
2018-05-163761-033-11200.630 ppm
2018-05-233761-038-09500.980 ppm
2018-05-233761-044-10301.10 ppm
2018-06-063761-047-10450.880 ppm
2018-07-113761-034-10003.20 ppm
2018-07-113761-037-07451.20 ppm
2018-07-183761-019-0815ND
2018-07-183761-040-07000.670 ppm
2018-07-253761-032-08200.840 ppm
2018-07-253761-039-08450.640 ppm
2018-08-083761-060-0730ND
2018-10-243761-028-09000.870 ppm
2018-12-124790-046-07201.80 ppm
2018-12-134790-024-0820ND
2019-05-244790-029-14100.570 ppm
2019-05-244790-030-09550.730 ppm
2019-05-244790-031-07300.470 ppm
2019-05-244790-043-09300.870 ppm
2019-05-244790-060-13450.450 ppm
2019-06-194790-026-13000.620 ppm
2019-06-194790-033-14300.460 ppm
2019-06-194790-040-10000.450 ppm
2019-06-194790-044-11500.840 ppm
2019-06-194790-046-11101.80 ppm
2019-07-244790-025-10000.480 ppm
2019-07-244790-031-10300.550 ppm
2019-07-244790-039-07300.670 ppm
2019-07-254790-024-0200ND
2019-08-064790-034-07452.70 ppm
2019-08-064790-038-10200.700 ppm
2019-08-294790-019-1025ND
2019-08-294790-032-11050.690 ppm
2019-08-294790-045-09402.70 ppm
2019-08-294790-047-07400.830 ppm
2019-09-244790-037-07400.990 ppm
2019-10-174790-027-06450.450 ppm