Nitrate

Los Angeles County WW District 4 & 34-Lancaster

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

181

Samples

Samples exceeding legal limit (MCL)

143

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2013	N/A	0	0	N/A
2014	1.24 ppm	31	24	ND - 4.04 ppm
2015	1.30 ppm	34	25	ND - 5.40 ppm
2016	1.35 ppm	27	22	ND - 5.23 ppm
2017	1.37 ppm	31	26	ND - 4.40 ppm
2018	1.50 ppm	28	21	ND - 5.00 ppm
2019	1.53 ppm	30	25	ND - 4.90 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
2014-02-19	5442-002-0939	ND
2014-02-19	5442-036-0820	ND
2014-02-25	5442-016-1050	3.30 ppm
2014-02-25	5442-023-1035	3.95 ppm
2014-02-25	5442-035-0924	1.14 ppm
2014-03-04	5442-023-1130	4.04 ppm
2014-03-05	5442-062-1123	1.66 ppm
2014-03-05	5442-071-1158	0.533 ppm
2014-03-11	5442-026-0845	0.827 ppm
2014-03-11	5442-053-1059	ND
2014-03-11	5442-054-1111	ND
2014-03-12	5442-028-0919	0.576 ppm
2014-03-18	5442-011-0830	ND
2014-03-26	5442-055-1034	ND
2014-04-08	5442-063-0920	0.587 ppm
2014-04-21	5442-070-1036	0.547 ppm
2014-05-07	5442-070-1100	0.551 ppm
2014-05-13	5442-037-1138	0.587 ppm
2014-05-13	5442-040-0900	0.671 ppm
2014-05-13	5442-093-1040	0.452 ppm
2014-06-03	5442-041-0944	0.924 ppm
2014-06-11	5442-048-0928	0.614 ppm
2014-06-17	5442-069-0900	1.36 ppm
2014-06-24	5442-094-0900	1.36 ppm
2014-06-24	5442-095-1100	1.27 ppm
2014-06-25	5442-023-0832	3.86 ppm
2014-06-26	5442-093-0850	ND
2014-07-09	5442-045-1024	1.32 ppm
2014-07-17	5442-067-1026	0.585 ppm
2014-09-09	5442-023-0841	3.86 ppm
2014-12-03	5442-023-0835	3.93 ppm
2015-01-28	5442-053-0915	ND
2015-02-04	5442-016-1133	3.50 ppm
2015-02-04	5442-023-1030	4.07 ppm
2015-02-05	5442-035-1035	1.61 ppm
2015-02-09	5442-002-1045	ND
2015-02-25	5442-036-0910	ND
2015-03-04	5442-011-1020	ND
2015-03-04	5442-053-0910	ND
2015-03-04	5442-054-0915	ND
2015-03-09	5442-023-0855	4.13 ppm
2015-03-10	5442-026-0827	0.861 ppm
2015-03-10	5442-071-0940	0.479 ppm
2015-03-11	5442-028-0850	0.630 ppm
2015-03-11	5442-062-0830	1.82 ppm
2015-03-12	5442-055-1000	ND
2015-04-01	5442-070-1020	0.501 ppm
2015-04-08	5442-036-0852	ND
2015-04-08	5442-063-1055	0.558 ppm
2015-04-14	5442-068-1110	0.642 ppm
2015-05-05	5442-040-0943	0.551 ppm
2015-05-06	5442-037-1030	0.542 ppm
2015-05-07	5442-093-0850	0.452 ppm
2015-06-02	5442-041-0916	1.03 ppm
2015-06-02	5442-048-0816	0.565 ppm
2015-06-02	5442-069-1100	1.44 ppm
2015-06-02	5442-094-1140	1.04 ppm
2015-06-25	5442-023-0841	4.00 ppm
2015-07-07	5442-045-0938	1.26 ppm
2015-07-08	5442-067-0922	0.572 ppm
2015-08-12	5442-036-0910	ND
2015-12-16	5442-023-1055	5.39 ppm
2015-12-16	5442-023-1055	5.40 ppm
2015-12-16	5442-095-1125	1.54 ppm
2015-12-16	5442-095-1125	1.54 ppm
2016-01-19	5442-035-0950	0.681 ppm
2016-01-19	5442-040-0945	0.551 ppm
2016-01-25	5442-028-0840	0.798 ppm
2016-01-25	5442-048-0940	0.492 ppm
2016-01-25	5442-062-0930	1.15 ppm
2016-01-26	5442-093-1100	0.455 ppm
2016-02-09	5442-016-1028	3.61 ppm
2016-02-09	5442-068-1025	0.672 ppm
2016-02-09	5442-069-1010	1.49 ppm
2016-02-09	5442-070-1110	0.519 ppm
2016-02-10	5442-071-1125	0.481 ppm
2016-03-09	5442-023-1041	5.23 ppm
2016-03-28	5442-067-0856	0.574 ppm
2016-04-20	5442-026-1016	0.970 ppm
2016-04-20	5442-041-0934	1.11 ppm
2016-06-08	5442-036-0945	ND
2016-06-09	5442-023-1053	3.95 ppm
2016-06-27	5442-094-1125	1.28 ppm
2016-06-27	5442-095-1050	1.37 ppm
2016-06-28	5442-053-1155	ND
2016-06-28	5442-054-1152	ND
2016-09-14	5442-037-1147	1.29 ppm
2016-09-27	5442-023-0856	4.06 ppm
2016-11-09	5442-095-1035	1.57 ppm
2016-11-16	5442-055-0912	ND
2016-12-07	5442-023-0929	4.11 ppm
2016-12-15	5442-011-1027	ND
2017-03-15	5442-023-0700	4.40 ppm
2017-06-21	9588-023-0930	3.70 ppm
2017-07-17	9588-036-0836	ND
2017-07-17	9588-069-1030	1.70 ppm
2017-07-17	9588-094-1110	1.40 ppm
2017-07-18	9588-016-1000	3.40 ppm
2017-07-18	9588-023-0945	3.90 ppm
2017-07-18	9588-028-1105	0.660 ppm
2017-07-18	9588-035-0900	1.40 ppm
2017-07-18	9588-048-1000	0.570 ppm
2017-07-18	9588-062-1010	1.10 ppm
2017-07-18	9588-063-0950	0.550 ppm
2017-07-18	9588-067-1030	0.630 ppm
2017-07-24	9588-070-1010	0.610 ppm
2017-07-24	9588-071-1000	0.530 ppm
2017-08-15	9590-041-1040	1.30 ppm
2017-08-15	9590-045-1015	1.80 ppm
2017-08-16	9590-040-1030	0.750 ppm
2017-08-16	9590-093-0850	0.490 ppm
2017-08-16	9590-095-0915	1.50 ppm
2017-08-29	9590-094-0930	0.730 ppm
2017-09-26	9590-011-1130	ND
2017-09-26	9590-023-1000	4.00 ppm
2017-09-26	9590-055-1050	ND
2017-11-21	9590-045-0935	1.40 ppm
2017-11-27	9590-023-1020	0.550 ppm
2017-11-28	9590-023-1100	3.90 ppm
2017-11-29	9590-037-1100	1.000 ppm
2017-11-29	9590-053-1045	ND
2017-11-29	9590-054-1030	ND
2017-12-27	9590-068-0935	0.640 ppm
2018-01-10	9590-037-1055	1.000 ppm
2018-01-10	9590-053-1035	ND
2018-01-10	9590-054-1045	ND
2018-01-11	9590-011-1045	ND
2018-01-11	9590-055-1010	ND
2018-02-26	9590-035-0900	ND
2018-02-26	9590-062-1040	1.000 ppm
2018-02-26	9590-063-1030	0.480 ppm
2018-02-26	9590-093-0930	0.480 ppm
2018-02-28	9590-016-1324	3.50 ppm
2018-02-28	9590-023-1313	5.00 ppm
2018-02-28	9590-035-1205	1.60 ppm
2018-02-28	9590-040-1200	0.590 ppm
2018-02-28	9590-041-0858	1.40 ppm
2018-02-28	9590-067-1105	0.590 ppm
2018-02-28	9590-069-1030	1.50 ppm
2018-02-28	9590-071-1110	0.470 ppm
2018-02-28	9590-095-1010	1.70 ppm
2018-03-20	9590-094-1222	2.00 ppm
2018-04-18	9590-023-1120	4.00 ppm
2018-07-24	9590-023-1055	4.10 ppm
2018-08-27	9590-023-1030	4.70 ppm
2018-09-19	9590-026-1045	1.30 ppm
2018-09-19	9590-036-1131	ND
2018-10-09	9590-026-1020	1.30 ppm
2018-10-16	9590-028-1020	0.470 ppm
2018-10-16	9590-048-1100	ND
2018-10-22	9590-023-1050	4.80 ppm
2019-01-07	9590-093-1706	0.500 ppm
2019-01-08	9590-023-1115	4.10 ppm
2019-01-08	9590-026-1025	1.40 ppm
2019-01-08	9590-045-1020	1.90 ppm
2019-02-06	9590-067-1100	0.580 ppm
2019-02-11	9590-070-1125	0.520 ppm
2019-02-11	9590-071-1120	0.520 ppm
2019-02-19	9590-011-1145	ND
2019-02-26	9590-028-1150	0.650 ppm
2019-02-26	9590-048-1225	0.570 ppm
2019-02-26	9590-062-1210	1.80 ppm
2019-02-26	9590-063-1210	0.400 ppm
2019-03-13	9590-036-1035	ND
2019-03-13	9590-094-0920	1.40 ppm
2019-03-13	9590-095-0940	1.80 ppm
2019-03-19	9590-035-1120	3.00 ppm
2019-03-19	9590-040-1145	0.640 ppm
2019-03-19	9590-041-0930	2.00 ppm
2019-03-19	9590-053-1315	ND
2019-03-19	9590-054-1300	ND
2019-03-26	9590-069-0945	1.60 ppm
2019-04-15	9590-023-1000	4.50 ppm
2019-06-19	9590-037-1000	0.860 ppm
2019-07-09	9590-023-0700	4.60 ppm
2019-08-12	9590-026-0900	1.40 ppm
2019-08-12	9590-055-1040	ND
2019-08-13	9590-093-1040	0.500 ppm
2019-08-19	9590-023-1020	4.10 ppm
2019-10-22	9590-023-1100	4.90 ppm
2019-12-23	9590-095-0933	1.80 ppm