Nitrate
El Monte Water Department
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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2014 | 2.91 ppm | 30 | 30 | 1.18 ppm - 6.33 ppm |
2015 | 3.39 ppm | 28 | 28 | 2.13 ppm - 7.00 ppm |
2016 | 5.48 ppm | 36 | 35 | ND - 9.30 ppm |
2017 | 4.81 ppm | 41 | 41 | 2.20 ppm - 8.68 ppm |
2018 | 4.90 ppm | 45 | 45 | 2.20 ppm - 8.70 ppm |
2019 | 4.73 ppm | 85 | 85 | 1.85 ppm - 9.16 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 |
---|---|---|
2014-01-28 | 9588-006-1035 | 5.42 ppm |
2014-01-28 | 9588-008-1000 | 5.87 ppm |
2014-03-04 | 4792-006-1125 | 5.04 ppm |
2014-03-04 | 4792-006-1130 | 5.15 ppm |
2014-03-04 | 4792-009-1155 | 1.22 ppm |
2014-03-04 | 4792-009-1200 | 1.18 ppm |
2014-03-12 | 9588-002-0830 | 2.26 ppm |
2014-04-24 | 9588-002-0955 | 2.26 ppm |
2014-04-24 | 9588-006-1005 | 2.01 ppm |
2014-06-03 | 4792-002-1225 | 2.06 ppm |
2014-06-03 | 4792-002-1230 | 2.58 ppm |
2014-06-03 | 4792-006-1115 | 1.92 ppm |
2014-06-03 | 4792-006-1120 | 1.89 ppm |
2014-06-03 | 4792-009-1330 | 2.71 ppm |
2014-06-03 | 4792-009-1335 | 2.67 ppm |
2014-07-28 | 9588-002-1050 | 4.74 ppm |
2014-07-28 | 9588-006-1110 | 6.33 ppm |
2014-07-28 | 9588-009-1030 | 1.72 ppm |
2014-09-02 | 4792-002-1315 | 3.03 ppm |
2014-09-02 | 4792-002-1320 | 3.00 ppm |
2014-09-02 | 4792-006-1350 | 1.78 ppm |
2014-09-02 | 4792-006-1355 | 1.80 ppm |
2014-09-02 | 4792-009-1205 | 1.95 ppm |
2014-09-02 | 4792-009-1215 | 1.93 ppm |
2014-10-28 | 9588-006-1030 | 3.84 ppm |
2014-11-06 | 9588-002-1010 | 2.71 ppm |
2014-12-02 | 4792-006-1355 | 3.03 ppm |
2014-12-02 | 4792-006-1400 | 1.99 ppm |
2014-12-02 | 4792-009-1420 | 2.02 ppm |
2014-12-02 | 4792-009-1425 | 3.05 ppm |
2015-01-13 | 9588-002-0945 | 4.97 ppm |
2015-01-13 | 9588-006-1015 | 7.00 ppm |
2015-03-03 | 4792-002-1120 | 4.81 ppm |
2015-03-03 | 4792-002-1125 | 4.83 ppm |
2015-03-03 | 4792-006-1020 | 2.91 ppm |
2015-03-03 | 4792-006-1025 | 2.76 ppm |
2015-03-03 | 4792-009-1145 | 3.23 ppm |
2015-03-03 | 4792-009-1150 | 3.09 ppm |
2015-04-28 | 9588-002-1000 | 2.15 ppm |
2015-04-28 | 9588-006-1110 | 3.39 ppm |
2015-06-03 | 4792-002-1255 | 2.44 ppm |
2015-06-03 | 4792-002-1300 | 2.39 ppm |
2015-06-03 | 4792-006-1150 | 2.13 ppm |
2015-06-03 | 4792-006-1155 | 2.13 ppm |
2015-06-03 | 4792-009-0825 | 3.30 ppm |
2015-06-03 | 4792-009-0830 | 3.34 ppm |
2015-07-28 | 9588-002-0955 | 2.26 ppm |
2015-07-28 | 9588-006-1010 | 4.07 ppm |
2015-07-28 | 9588-009-0940 | 3.39 ppm |
2015-09-01 | 4792-002-1405 | 2.19 ppm |
2015-09-01 | 4792-002-1405 | 2.19 ppm |
2015-09-01 | 4792-002-1410 | 2.20 ppm |
2015-09-01 | 4792-006-1305 | 2.21 ppm |
2015-09-01 | 4792-006-1310 | 2.90 ppm |
2015-09-01 | 4792-009-1110 | 3.11 ppm |
2015-09-01 | 4792-009-1115 | 3.10 ppm |
2015-10-29 | 9588-002-1020 | 5.60 ppm |
2015-10-29 | 9588-006-1035 | 6.90 ppm |
2016-01-11 | 9588-006-1045 | 6.40 ppm |
2016-02-17 | 4792-002-1045 | 2.60 ppm |
2016-03-09 | 9588-002-0910 | 4.50 ppm |
2016-04-28 | 9588-002-1350 | 2.50 ppm |
2016-04-28 | 9588-006-1410 | 9.30 ppm |
2016-06-07 | 4792-002-0935 | 8.36 ppm |
2016-06-07 | 4792-002-0945 | 8.46 ppm |
2016-06-07 | 4792-006-0920 | 7.84 ppm |
2016-06-07 | 4792-006-0925 | 7.82 ppm |
2016-06-07 | 4792-008-1000 | 9.15 ppm |
2016-06-07 | 4792-008-1045 | 9.12 ppm |
2016-06-07 | 4792-009-1055 | 5.25 ppm |
2016-06-07 | 4792-009-1100 | 5.17 ppm |
2016-07-07 | 9588-002-1040 | 6.30 ppm |
2016-07-07 | 9588-006-1055 | 5.90 ppm |
2016-07-07 | 9588-008-1015 | 7.90 ppm |
2016-07-07 | 9588-009-0950 | 4.30 ppm |
2016-08-02 | 4792-002-1210 | ND |
2016-09-06 | 4792-002-0900 | 2.35 ppm |
2016-09-06 | 4792-002-0945 | 2.34 ppm |
2016-09-06 | 4792-006-1000 | 6.50 ppm |
2016-09-06 | 4792-006-1010 | 6.93 ppm |
2016-09-06 | 4792-008-0830 | 7.44 ppm |
2016-09-06 | 4792-008-0900 | 7.44 ppm |
2016-09-06 | 4792-009-0755 | 4.04 ppm |
2016-09-06 | 4792-009-0800 | 4.03 ppm |
2016-10-12 | 9588-002-0955 | 2.40 ppm |
2016-10-12 | 9588-008-0940 | 7.60 ppm |
2016-11-01 | 4792-009-0735 | 3.58 ppm |
2016-11-23 | 9588-006-1025 | 2.40 ppm |
2016-12-06 | 4792-006-1005 | 2.24 ppm |
2016-12-06 | 4792-006-1010 | 2.25 ppm |
2016-12-06 | 4792-008-1125 | 8.59 ppm |
2016-12-06 | 4792-008-1130 | 8.68 ppm |
2016-12-06 | 4792-009-1140 | 3.87 ppm |
2016-12-06 | 4792-009-1145 | 3.69 ppm |
2017-01-30 | 9588-002-1330 | 2.20 ppm |
2017-01-30 | 9588-006-1350 | 6.80 ppm |
2017-03-07 | 4792-002-0850 | 2.64 ppm |
2017-03-07 | 4792-006-0755 | 6.01 ppm |
2017-03-07 | 4792-008-1005 | 8.51 ppm |
2017-03-07 | 4792-009-1035 | 3.65 ppm |
2017-03-09 | 9588-008-0815 | 8.40 ppm |
2017-04-27 | 9588-002-1415 | 5.20 ppm |
2017-04-27 | 9588-006-1435 | 6.30 ppm |
2017-04-27 | 9588-008-1400 | 7.90 ppm |
2017-06-06 | 4792-002-0900 | 2.52 ppm |
2017-06-06 | 4792-002-0915 | 2.55 ppm |
2017-06-06 | 4792-006-0930 | 7.30 ppm |
2017-06-06 | 4792-006-0940 | 6.78 ppm |
2017-06-06 | 4792-009-0705 | 4.41 ppm |
2017-06-06 | 4792-009-0715 | 4.56 ppm |
2017-08-03 | 9588-002-1010 | 2.40 ppm |
2017-08-03 | 9588-006-1035 | 3.20 ppm |
2017-08-03 | 9588-008-1000 | 8.10 ppm |
2017-08-03 | 9588-009-0945 | 3.30 ppm |
2017-09-05 | 4792-002-1035 | 2.25 ppm |
2017-09-05 | 4792-002-1040 | 2.50 ppm |
2017-09-05 | 4792-006-0935 | 6.73 ppm |
2017-09-05 | 4792-006-0940 | 7.44 ppm |
2017-09-05 | 4792-008-1140 | 7.77 ppm |
2017-09-05 | 4792-008-1145 | 8.68 ppm |
2017-09-05 | 4792-009-1050 | 2.69 ppm |
2017-09-05 | 4792-009-1100 | 2.61 ppm |
2017-09-27 | 4792-002-1010 | 2.44 ppm |
2017-09-27 | 4792-002-1100 | 3.38 ppm |
2017-10-12 | 9588-006-1005 | 2.40 ppm |
2017-12-06 | 4792-002-0745 | 2.47 ppm |
2017-12-06 | 4792-002-0755 | 2.66 ppm |
2017-12-06 | 9588-002-1000 | 2.50 ppm |
2017-12-06 | 4792-006-0825 | 2.43 ppm |
2017-12-06 | 4792-006-1130 | 2.43 ppm |
2017-12-06 | 9588-008-1015 | 8.60 ppm |
2017-12-06 | 4792-008-1050 | 8.33 ppm |
2017-12-06 | 4792-008-1130 | 8.44 ppm |
2017-12-06 | 4792-009-0850 | 3.79 ppm |
2017-12-06 | 4792-009-0855 | 3.78 ppm |
2018-01-25 | 9588-002-1040 | 4.20 ppm |
2018-01-25 | 9588-006-1130 | 2.20 ppm |
2018-01-25 | 9588-008-1030 | 8.40 ppm |
2018-03-06 | 4792-002-0930 | 2.44 ppm |
2018-03-06 | 4792-002-0935 | 2.42 ppm |
2018-03-06 | 4792-006-0955 | 6.76 ppm |
2018-03-06 | 4792-006-1000 | 6.77 ppm |
2018-03-06 | 4792-008-0820 | 7.95 ppm |
2018-03-06 | 4792-009-0700 | 4.49 ppm |
2018-03-06 | 4792-009-0705 | 4.58 ppm |
2018-04-12 | 9588-002-1010 | 5.20 ppm |
2018-04-12 | 9588-006-1040 | 2.30 ppm |
2018-04-12 | 9588-008-0955 | 7.60 ppm |
2018-06-05 | 4792-002-0910 | 4.84 ppm |
2018-06-05 | 4792-002-0920 | 4.85 ppm |
2018-06-05 | 4792-006-0930 | 2.42 ppm |
2018-06-05 | 4792-006-0940 | 2.41 ppm |
2018-06-05 | 4792-008-0000 | 8.35 ppm |
2018-06-05 | 4792-008-0815 | 8.26 ppm |
2018-06-05 | 4792-009-0650 | 3.86 ppm |
2018-06-05 | 4792-009-0700 | 4.01 ppm |
2018-07-25 | 9588-002-1330 | 2.40 ppm |
2018-07-25 | 9588-006-1405 | 2.70 ppm |
2018-07-25 | 9588-008-1315 | 8.30 ppm |
2018-07-25 | 9588-009-1300 | 3.80 ppm |
2018-08-21 | 4792-002-0745 | 2.54 ppm |
2018-09-05 | 4792-002-1045 | 5.53 ppm |
2018-09-05 | 4792-002-1050 | 5.34 ppm |
2018-09-05 | 4792-006-1120 | 2.71 ppm |
2018-09-05 | 4792-006-1125 | 2.69 ppm |
2018-09-05 | 4792-008-0850 | 8.40 ppm |
2018-09-05 | 4792-009-0720 | 4.58 ppm |
2018-09-05 | 4792-009-0725 | 4.73 ppm |
2018-10-02 | 4792-002-0935 | 4.93 ppm |
2018-10-31 | 9588-002-1030 | 5.00 ppm |
2018-10-31 | 9588-006-1110 | 7.50 ppm |
2018-10-31 | 9588-008-1015 | 8.70 ppm |
2018-11-28 | 4792-002-0820 | 4.01 ppm |
2018-12-04 | 4792-002-1025 | 4.38 ppm |
2018-12-04 | 4792-006-1050 | 2.38 ppm |
2018-12-04 | 4792-006-1055 | 2.27 ppm |
2018-12-04 | 4792-008-0920 | 7.95 ppm |
2018-12-04 | 4792-008-0925 | 7.86 ppm |
2018-12-04 | 4792-009-0805 | 3.96 ppm |
2018-12-04 | 4792-009-0810 | 3.69 ppm |
2019-01-08 | 4792-002-1015 | 4.66 ppm |
2019-01-31 | 9588-002-0940 | 5.20 ppm |
2019-01-31 | 9588-006-1050 | 2.20 ppm |
2019-01-31 | 9588-008-0950 | 8.50 ppm |
2019-02-19 | 4792-043-0825 | 2.77 ppm |
2019-02-19 | 4792-044-0810 | 5.23 ppm |
2019-02-19 | 4792-045-0815 | 5.99 ppm |
2019-03-05 | 4792-002-1145 | 4.31 ppm |
2019-03-05 | 4792-002-1235 | 4.30 ppm |
2019-03-05 | 4792-006-1015 | 2.63 ppm |
2019-03-05 | 4792-006-1025 | 2.76 ppm |
2019-03-05 | 4792-008-1300 | 8.52 ppm |
2019-03-05 | 4792-008-1410 | 8.53 ppm |
2019-03-05 | 4792-009-0935 | 3.56 ppm |
2019-03-05 | 4792-009-0955 | 3.38 ppm |
2019-03-08 | 4792-043-1210 | 2.78 ppm |
2019-03-08 | 4792-044-1045 | 5.03 ppm |
2019-03-08 | 4792-045-1135 | 5.86 ppm |
2019-04-02 | 4792-002-0840 | 2.88 ppm |
2019-04-25 | 9588-002-1305 | 3.00 ppm |
2019-04-25 | 9588-006-1325 | 5.50 ppm |
2019-04-25 | 9588-008-1250 | 9.00 ppm |
2019-05-08 | 4792-002-0000 | 3.37 ppm |
2019-05-28 | 9588-043-1310 | 3.00 ppm |
2019-05-28 | 9588-044-1240 | 3.80 ppm |
2019-05-28 | 9588-045-1255 | 4.90 ppm |
2019-06-05 | 4792-002-0920 | 5.12 ppm |
2019-06-05 | 4792-002-1220 | 5.12 ppm |
2019-06-05 | 4792-006-1035 | 2.26 ppm |
2019-06-05 | 4792-006-1055 | 2.26 ppm |
2019-06-05 | 4792-008-0805 | 8.14 ppm |
2019-06-05 | 4792-008-0910 | 8.16 ppm |
2019-06-05 | 4792-009-0735 | 2.13 ppm |
2019-06-05 | 4792-009-0750 | 2.23 ppm |
2019-06-05 | 4792-043-1425 | 2.74 ppm |
2019-06-05 | 4792-043-1440 | 2.52 ppm |
2019-06-05 | 4792-044-1340 | 5.12 ppm |
2019-06-05 | 4792-044-1355 | 5.16 ppm |
2019-06-05 | 4792-045-1405 | 5.85 ppm |
2019-06-05 | 4792-045-1420 | 5.89 ppm |
2019-06-05 | 4792-052-1515 | 4.84 ppm |
2019-07-03 | 4792-002-0810 | 5.26 ppm |
2019-07-25 | 9588-002-1455 | 3.10 ppm |
2019-07-25 | 9588-006-1530 | 6.70 ppm |
2019-07-25 | 9588-008-1445 | 8.60 ppm |
2019-07-25 | 9588-009-1430 | 4.60 ppm |
2019-07-25 | 9588-043-1415 | 3.00 ppm |
2019-07-25 | 9588-044-1345 | 5.30 ppm |
2019-07-25 | 9588-045-1400 | 6.10 ppm |
2019-08-06 | 4792-002-0850 | 5.68 ppm |
2019-09-03 | 4792-002-1015 | 3.00 ppm |
2019-09-03 | 4792-002-1055 | 2.93 ppm |
2019-09-03 | 4792-006-0935 | 6.46 ppm |
2019-09-03 | 4792-006-0945 | 5.96 ppm |
2019-09-03 | 4792-008-0800 | 7.89 ppm |
2019-09-03 | 4792-008-0905 | 7.88 ppm |
2019-09-03 | 4792-009-0740 | 1.86 ppm |
2019-09-03 | 4792-009-0750 | 1.88 ppm |
2019-09-03 | 4792-043-1305 | 2.84 ppm |
2019-09-03 | 4792-043-1320 | 2.72 ppm |
2019-09-03 | 4792-044-1215 | 4.89 ppm |
2019-09-03 | 4792-044-1230 | 4.91 ppm |
2019-09-03 | 4792-045-1240 | 5.81 ppm |
2019-09-03 | 4792-045-1255 | 5.81 ppm |
2019-10-01 | 4792-002-0950 | 4.65 ppm |
2019-10-30 | 9588-002-1355 | 5.20 ppm |
2019-10-30 | 9588-006-1425 | 2.50 ppm |
2019-10-30 | 9588-008-1325 | 8.70 ppm |
2019-11-05 | 4792-002-0950 | 3.32 ppm |
2019-12-03 | 4792-002-1005 | 4.53 ppm |
2019-12-03 | 4792-002-1015 | 3.58 ppm |
2019-12-03 | 4792-006-0725 | 2.37 ppm |
2019-12-03 | 4792-006-0745 | 2.31 ppm |
2019-12-03 | 4792-008-0840 | 9.16 ppm |
2019-12-03 | 4792-008-0950 | 9.15 ppm |
2019-12-03 | 4792-009-0800 | 1.86 ppm |
2019-12-03 | 4792-009-0820 | 1.85 ppm |
2019-12-03 | 9588-043-1345 | 2.80 ppm |
2019-12-03 | 9588-044-1345 | 5.20 ppm |
2019-12-03 | 9588-045-1335 | 6.00 ppm |
2019-12-05 | 4792-043-0815 | 3.15 ppm |
2019-12-05 | 4792-043-0830 | 3.35 ppm |
2019-12-05 | 4792-044-0730 | 6.14 ppm |
2019-12-05 | 4792-045-0750 | 6.55 ppm |
2019-12-05 | 4792-045-0800 | 6.89 ppm |