Nitrate

Indio Water Authority

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

161

Samples

Samples exceeding legal limit (MCL)

152

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	1.84 ppm	35	33	ND - 7.45 ppm
2015	1.16 ppm	41	34	ND - 4.74 ppm
2016	2.15 ppm	22	22	0.410 ppm - 7.40 ppm
2017	1.75 ppm	18	18	0.410 ppm - 4.80 ppm
2018	1.78 ppm	21	21	0.400 ppm - 6.60 ppm
2019	1.84 ppm	24	24	0.440 ppm - 6.40 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
2014-01-29	9590-020-1105	7.00 ppm
2014-04-23	9590-020-0850	7.23 ppm
2014-07-16	9590-020-0930	4.97 ppm
2014-07-17	9590-019-0955	2.48 ppm
2014-07-17	9590-020-0825	4.97 ppm
2014-07-17	9590-021-0735	1.40 ppm
2014-07-17	9590-022-0805	2.48 ppm
2014-07-17	9590-023-0915	0.655 ppm
2014-07-17	9590-026-0855	0.768 ppm
2014-07-17	9590-027-1035	0.791 ppm
2014-07-17	9590-028-1100	0.452 ppm
2014-07-17	9590-033-1205	ND
2014-07-23	9590-003-0855	0.949 ppm
2014-07-23	9590-004-0755	0.655 ppm
2014-07-23	9590-007-0930	0.565 ppm
2014-07-23	9590-008-1145	0.858 ppm
2014-07-23	9590-009-1210	0.542 ppm
2014-07-23	9590-010-1115	0.633 ppm
2014-07-23	9590-011-1310	2.71 ppm
2014-07-23	9590-016-1250	2.26 ppm
2014-07-23	9590-017-0945	0.520 ppm
2014-07-23	9590-018-1235	1.81 ppm
2014-07-23	9590-034-0820	0.452 ppm
2014-08-06	9590-003-0745	0.678 ppm
2014-08-06	9590-004-0810	0.610 ppm
2014-08-06	9590-007-1130	0.542 ppm
2014-08-06	9590-008-1000	0.949 ppm
2014-08-06	9590-009-0920	0.497 ppm
2014-08-06	9590-010-1030	0.768 ppm
2014-08-06	9590-011-1225	2.26 ppm
2014-08-06	9590-016-1310	2.94 ppm
2014-08-06	9590-017-1150	0.520 ppm
2014-08-06	9590-018-1300	1.99 ppm
2014-08-06	9590-034-0845	ND
2014-10-23	9590-020-0805	7.45 ppm
2015-01-29	9590-020-1005	4.74 ppm
2015-04-29	9590-020-1135	4.52 ppm
2015-07-01	9590-027-1230	0.745 ppm
2015-07-02	9590-027-1230	0.723 ppm
2015-07-03	9590-027-1215	0.723 ppm
2015-07-06	9590-034-1215	0.497 ppm
2015-07-07	9590-034-1423	0.452 ppm
2015-07-08	9590-034-1334	0.474 ppm
2015-07-09	9590-034-1425	0.452 ppm
2015-07-10	9590-034-1150	0.452 ppm
2015-07-14	9590-003-1830	0.858 ppm
2015-07-14	9590-017-1815	0.565 ppm
2015-07-15	9590-004-1145	0.745 ppm
2015-07-15	9590-019-1340	0.994 ppm
2015-07-15	9590-020-1245	4.52 ppm
2015-07-15	9590-027-1300	0.700 ppm
2015-07-15	9590-034-1200	0.452 ppm
2015-07-16	9590-008-0908	1.81 ppm
2015-07-16	9590-010-0945	0.610 ppm
2015-07-16	9590-023-1000	0.881 ppm
2015-07-16	9590-033-1020	ND
2015-07-16	9590-033-1025	ND
2015-07-17	9590-033-1015	ND
2015-07-20	9590-033-1245	ND
2015-07-21	9590-033-1245	ND
2015-07-22	9590-007-1210	0.497 ppm
2015-07-22	9590-028-1225	0.497 ppm
2015-07-22	9590-033-1245	ND
2015-07-23	9590-009-1040	0.723 ppm
2015-07-23	9590-021-1025	1.36 ppm
2015-07-23	9590-022-1010	1.31 ppm
2015-07-23	9590-026-0955	4.07 ppm
2015-07-30	9590-011-1320	1.81 ppm
2015-07-30	9590-016-1330	2.71 ppm
2015-07-30	9590-018-1300	1.45 ppm
2015-07-31	9590-052-0910	ND
2015-08-13	9590-053-1240	0.610 ppm
2015-08-18	9590-054-0840	0.452 ppm
2015-10-28	9590-020-1300	4.52 ppm
2015-12-09	9590-026-0945	0.890 ppm
2015-12-09	9590-026-0945	0.881 ppm
2016-01-27	9590-020-0920	7.10 ppm
2016-04-28	9590-020-0915	4.50 ppm
2016-07-27	9590-004-1310	0.780 ppm
2016-07-27	9590-011-1110	2.10 ppm
2016-07-27	9590-018-1250	1.40 ppm
2016-07-27	9590-019-1045	1.10 ppm
2016-07-27	9590-020-1205	4.70 ppm
2016-07-27	9590-021-1225	1.30 ppm
2016-07-27	9590-027-1035	0.690 ppm
2016-07-27	9590-033-1005	0.410 ppm
2016-07-27	9590-034-0850	0.480 ppm
2016-08-22	9590-027-0845	0.700 ppm
2016-08-22	9590-033-1130	0.410 ppm
2016-08-22	9590-034-1005	0.480 ppm
2016-08-31	9590-004-0715	0.770 ppm
2016-08-31	9590-011-0910	1.80 ppm
2016-08-31	9590-016-1050	2.80 ppm
2016-08-31	9590-018-0930	1.30 ppm
2016-08-31	9590-019-1020	1.10 ppm
2016-08-31	9590-020-0830	4.70 ppm
2016-08-31	9590-022-0810	1.30 ppm
2016-10-26	9590-020-1250	7.40 ppm
2017-04-27	9590-020-0855	4.60 ppm
2017-07-26	9590-020-0935	4.80 ppm
2017-10-26	9590-020-0915	4.50 ppm
2017-12-13	9590-008-0935	1.20 ppm
2017-12-13	9590-010-0845	0.580 ppm
2017-12-13	9590-011-1000	1.70 ppm
2017-12-13	9590-016-1115	2.70 ppm
2017-12-13	9590-017-1300	0.550 ppm
2017-12-13	9590-018-1045	1.10 ppm
2017-12-14	9590-003-1105	1.10 ppm
2017-12-14	9590-004-1100	0.720 ppm
2017-12-14	9590-019-0935	1.60 ppm
2017-12-14	9590-022-0910	3.00 ppm
2017-12-14	9590-023-0825	0.820 ppm
2017-12-14	9590-026-0805	0.840 ppm
2017-12-14	9590-027-1000	0.770 ppm
2017-12-14	9590-033-1020	0.410 ppm
2017-12-14	9590-034-1130	0.440 ppm
2018-01-25	9590-020-0905	6.40 ppm
2018-02-15	9590-003-1330	1.10 ppm
2018-02-15	9590-008-1245	1.30 ppm
2018-02-15	9590-010-1220	0.580 ppm
2018-02-15	9590-023-1125	0.610 ppm
2018-05-31	9590-007-1200	0.550 ppm
2018-05-31	9590-017-1115	0.550 ppm
2018-07-26	9590-020-1100	4.80 ppm
2018-08-28	9590-028-1020	0.400 ppm
2018-11-29	9590-021-1240	1.30 ppm
2018-12-12	9590-004-1140	0.650 ppm
2018-12-13	9590-019-1015	1.80 ppm
2018-12-13	9590-034-1120	0.470 ppm
2018-12-20	9590-020-0420	6.60 ppm
2018-12-20	9590-022-0540	2.70 ppm
2018-12-20	9590-026-0450	0.660 ppm
2018-12-26	9590-011-0955	1.90 ppm
2018-12-26	9590-016-0825	2.90 ppm
2018-12-26	9590-018-0850	1.000 ppm
2018-12-26	9590-027-1245	0.720 ppm
2018-12-27	9590-033-1325	0.430 ppm
2019-01-31	9590-020-0750	6.40 ppm
2019-02-26	9590-003-1050	0.990 ppm
2019-02-26	9590-023-1135	0.700 ppm
2019-02-28	9590-008-1240	1.40 ppm
2019-02-28	9590-010-1255	0.630 ppm
2019-04-16	9590-009-0445	1.000 ppm
2019-04-23	9590-020-0815	5.00 ppm
2019-07-29	9590-020-0740	5.00 ppm
2019-08-26	9590-004-0730	0.700 ppm
2019-10-17	9590-020-1020	4.70 ppm
2019-11-07	9590-003-0720	0.980 ppm
2019-11-07	9590-018-0800	1.50 ppm
2019-11-07	9590-021-0840	1.20 ppm
2019-11-07	9590-033-1230	0.440 ppm
2019-11-07	9590-034-0650	0.460 ppm
2019-11-13	9590-017-0920	0.550 ppm
2019-11-13	9590-019-1000	2.10 ppm
2019-11-19	9590-027-0820	0.730 ppm
2019-11-21	9590-007-0705	0.670 ppm
2019-11-21	9590-011-0830	2.30 ppm
2019-11-21	9590-016-1110	2.80 ppm
2019-11-21	9590-022-0955	2.70 ppm
2019-11-21	9590-026-0850	0.760 ppm
2019-11-26	9590-028-1000	0.560 ppm