Nitrate
City of Gilroy
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 | 5.66 ppm | 40 | 40 | 2.71 ppm - 9.26 ppm |
2015 | 6.18 ppm | 50 | 50 | 2.48 ppm - 10.2 ppm |
2016 | 5.89 ppm | 38 | 38 | 2.40 ppm - 8.80 ppm |
2017 | 6.00 ppm | 43 | 43 | 2.40 ppm - 8.60 ppm |
2018 | 6.06 ppm | 51 | 51 | 2.40 ppm - 8.60 ppm |
2019 | 6.06 ppm | 44 | 44 | 2.50 ppm - 8.30 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 |
---|---|---|
2014-01-15 | 5810-001-0925 | 6.33 ppm |
2014-01-15 | 5810-002-0947 | 4.52 ppm |
2014-01-15 | 5810-004-1045 | 2.71 ppm |
2014-01-15 | 5810-006-1100 | 3.84 ppm |
2014-01-15 | 5810-007-0835 | 8.58 ppm |
2014-01-15 | 5810-008-0820 | 7.45 ppm |
2014-01-15 | 5810-010-0855 | 6.78 ppm |
2014-02-12 | 5810-008-1036 | 6.55 ppm |
2014-03-20 | 5810-008-0826 | 7.45 ppm |
2014-04-23 | 5810-001-0900 | 5.87 ppm |
2014-04-23 | 5810-002-0749 | 5.42 ppm |
2014-04-23 | 5810-004-0945 | 2.71 ppm |
2014-04-23 | 5810-006-1058 | 3.84 ppm |
2014-04-23 | 5810-007-1039 | 8.58 ppm |
2014-04-23 | 5810-008-0819 | 7.68 ppm |
2014-04-23 | 5810-010-0913 | 7.00 ppm |
2014-04-23 | 5810-011-0847 | 4.74 ppm |
2014-05-21 | 5810-008-0810 | 7.91 ppm |
2014-06-12 | 5810-008-0815 | 7.45 ppm |
2014-07-17 | 5810-001-0946 | 4.52 ppm |
2014-07-17 | 5810-002-0802 | 4.29 ppm |
2014-07-17 | 5810-004-0959 | 3.39 ppm |
2014-07-17 | 5810-006-0829 | 3.39 ppm |
2014-07-17 | 5810-007-1011 | 9.26 ppm |
2014-07-17 | 5810-008-0845 | 6.78 ppm |
2014-07-17 | 5810-009-0847 | 3.39 ppm |
2014-07-17 | 5810-010-0817 | 4.97 ppm |
2014-08-28 | 5810-008-1045 | 7.00 ppm |
2014-09-17 | 5810-007-0953 | 6.10 ppm |
2014-10-15 | 5810-001-0759 | 5.65 ppm |
2014-10-15 | 5810-002-1050 | 4.97 ppm |
2014-10-15 | 5810-004-1030 | 3.61 ppm |
2014-10-15 | 5810-006-0946 | 3.84 ppm |
2014-10-15 | 5810-007-0836 | 6.78 ppm |
2014-10-15 | 5810-008-0852 | 7.91 ppm |
2014-10-15 | 5810-009-0852 | 4.29 ppm |
2014-10-15 | 5810-010-0818 | 5.20 ppm |
2014-10-15 | 5810-011-1010 | 4.52 ppm |
2014-11-19 | 5810-008-0804 | 7.91 ppm |
2014-12-22 | 5810-009-0820 | 3.16 ppm |
2015-01-21 | 5810-001-0822 | 5.20 ppm |
2015-01-21 | 5810-002-0845 | 4.74 ppm |
2015-01-21 | 5810-004-1100 | 2.71 ppm |
2015-01-21 | 5810-006-1030 | 4.74 ppm |
2015-01-21 | 5810-007-0925 | 8.36 ppm |
2015-01-21 | 5810-008-0955 | 7.91 ppm |
2015-01-21 | 5810-009-1000 | 4.07 ppm |
2015-01-21 | 5810-010-0905 | 8.13 ppm |
2015-01-21 | 5810-011-0805 | 5.87 ppm |
2015-02-11 | 5810-008-0845 | 7.23 ppm |
2015-03-10 | 5810-008-0805 | 7.68 ppm |
2015-04-22 | 5810-001-0915 | 6.10 ppm |
2015-04-22 | 5810-002-0944 | 4.74 ppm |
2015-04-22 | 5810-004-1305 | 2.48 ppm |
2015-04-22 | 5810-006-0845 | 4.07 ppm |
2015-04-22 | 5810-007-1142 | 9.04 ppm |
2015-04-22 | 5810-008-1215 | 7.91 ppm |
2015-04-22 | 5810-009-1239 | 5.20 ppm |
2015-04-22 | 5810-010-1110 | 7.23 ppm |
2015-04-22 | 5810-011-1040 | 4.74 ppm |
2015-05-20 | 5810-006-0945 | 4.07 ppm |
2015-05-20 | 5810-007-1300 | 9.49 ppm |
2015-05-20 | 5810-008-1025 | 8.58 ppm |
2015-05-20 | 5810-009-1100 | 5.42 ppm |
2015-05-20 | 5810-010-0810 | 7.68 ppm |
2015-05-21 | 5810-001-0800 | 6.55 ppm |
2015-05-21 | 5810-002-1010 | 4.97 ppm |
2015-05-21 | 5810-004-1250 | 2.71 ppm |
2015-05-21 | 5810-011-0955 | 5.20 ppm |
2015-06-22 | 5810-008-0840 | 8.58 ppm |
2015-07-20 | 5810-001-0812 | 6.55 ppm |
2015-07-20 | 5810-002-0830 | 5.87 ppm |
2015-07-20 | 5810-004-0845 | 2.48 ppm |
2015-07-20 | 5810-006-1255 | 3.84 ppm |
2015-07-20 | 5810-007-1022 | 10.2 ppm |
2015-07-20 | 5810-008-1045 | 9.04 ppm |
2015-07-20 | 5810-009-1047 | 4.29 ppm |
2015-07-20 | 5810-010-1010 | 7.23 ppm |
2015-07-20 | 5810-011-0950 | 4.29 ppm |
2015-08-04 | 5810-007-0950 | 9.94 ppm |
2015-08-19 | 5810-008-0834 | 9.04 ppm |
2015-10-14 | 5810-001-1040 | 6.10 ppm |
2015-10-14 | 5810-004-1302 | 3.16 ppm |
2015-10-14 | 5810-006-1430 | 3.84 ppm |
2015-10-14 | 5810-008-1330 | 8.36 ppm |
2015-10-14 | 5810-009-1340 | 4.97 ppm |
2015-10-14 | 5810-010-1316 | 7.68 ppm |
2015-10-14 | 5810-011-1030 | 5.87 ppm |
2015-11-18 | 5810-008-0750 | 6.70 ppm |
2015-12-14 | 5810-008-0801 | 8.10 ppm |
2016-01-20 | 5810-001-0940 | 5.30 ppm |
2016-01-20 | 5810-002-0832 | 5.40 ppm |
2016-01-20 | 5810-004-1000 | 2.60 ppm |
2016-01-20 | 5810-006-0805 | 4.00 ppm |
2016-01-20 | 5810-008-0850 | 8.30 ppm |
2016-01-20 | 5810-010-0925 | 7.40 ppm |
2016-01-20 | 5810-011-0910 | 4.40 ppm |
2016-02-10 | 5810-008-0841 | 8.30 ppm |
2016-03-16 | 5810-008-0745 | 8.20 ppm |
2016-04-25 | 5810-001-0832 | 6.70 ppm |
2016-04-25 | 5810-002-1055 | 4.50 ppm |
2016-04-25 | 5810-004-0855 | 2.40 ppm |
2016-04-25 | 5810-006-0905 | 3.90 ppm |
2016-04-25 | 5810-008-0950 | 8.30 ppm |
2016-04-25 | 5810-009-0940 | 5.70 ppm |
2016-04-25 | 5810-010-1041 | 7.60 ppm |
2016-04-25 | 5810-011-1005 | 4.10 ppm |
2016-05-18 | 5810-008-0950 | 8.50 ppm |
2016-06-16 | 5810-008-0915 | 8.30 ppm |
2016-07-20 | 5810-001-0915 | 6.40 ppm |
2016-07-20 | 5810-002-0945 | 5.30 ppm |
2016-07-20 | 5810-004-0930 | 2.60 ppm |
2016-07-20 | 5810-006-1019 | 3.40 ppm |
2016-07-20 | 5810-008-0954 | 8.30 ppm |
2016-07-20 | 5810-009-0956 | 3.20 ppm |
2016-07-20 | 5810-011-1035 | 3.80 ppm |
2016-07-21 | 5810-010-1415 | 8.00 ppm |
2016-08-04 | 5810-008-1305 | 8.80 ppm |
2016-10-13 | 5810-001-0750 | 6.00 ppm |
2016-10-13 | 5810-002-0820 | 4.10 ppm |
2016-10-13 | 5810-004-1010 | 2.80 ppm |
2016-10-13 | 5810-006-0845 | 3.50 ppm |
2016-10-13 | 5810-008-1100 | 8.70 ppm |
2016-10-13 | 5810-009-1055 | 5.00 ppm |
2016-10-13 | 5810-010-1025 | 7.60 ppm |
2016-10-13 | 5810-011-0835 | 5.80 ppm |
2016-11-09 | 5810-008-0925 | 8.40 ppm |
2016-12-15 | 5810-008-0915 | 8.40 ppm |
2017-01-18 | 5810-001-0855 | 5.50 ppm |
2017-01-18 | 5810-002-0835 | 4.20 ppm |
2017-01-18 | 5810-004-0805 | 2.40 ppm |
2017-01-18 | 5810-006-1122 | 3.40 ppm |
2017-01-18 | 5810-008-1105 | 8.30 ppm |
2017-01-18 | 5810-009-1111 | 6.10 ppm |
2017-01-18 | 5810-010-0955 | 7.40 ppm |
2017-01-18 | 5810-011-0933 | 4.20 ppm |
2017-02-15 | 5810-008-0900 | 8.20 ppm |
2017-03-15 | 5810-008-0910 | 8.10 ppm |
2017-04-13 | 5810-001-0935 | 5.60 ppm |
2017-04-13 | 5810-002-0830 | 5.40 ppm |
2017-04-13 | 5810-006-0915 | 3.40 ppm |
2017-04-13 | 5810-008-1025 | 8.10 ppm |
2017-04-13 | 5810-009-1035 | 6.80 ppm |
2017-04-13 | 5810-010-1015 | 7.30 ppm |
2017-04-13 | 5810-011-0800 | 5.50 ppm |
2017-05-01 | 5810-007-1020 | 5.70 ppm |
2017-05-15 | 5810-008-1250 | 7.90 ppm |
2017-06-13 | 5810-004-0817 | 2.40 ppm |
2017-06-13 | 5810-007-0945 | 6.50 ppm |
2017-06-13 | 5810-008-0908 | 8.60 ppm |
2017-07-17 | 5810-001-1130 | 6.30 ppm |
2017-07-17 | 5810-002-1250 | 5.70 ppm |
2017-07-17 | 5810-007-1050 | 6.10 ppm |
2017-07-17 | 5810-010-1115 | 5.70 ppm |
2017-07-17 | 5810-011-1030 | 5.90 ppm |
2017-07-18 | 5810-004-1125 | 2.60 ppm |
2017-07-18 | 5810-006-1106 | 3.40 ppm |
2017-07-18 | 5810-008-1112 | 8.60 ppm |
2017-07-18 | 5810-009-1116 | 5.10 ppm |
2017-08-24 | 5810-008-0840 | 8.40 ppm |
2017-09-18 | 5810-008-0905 | 8.10 ppm |
2017-10-05 | 5810-001-0805 | 6.10 ppm |
2017-10-05 | 5810-004-1020 | 3.10 ppm |
2017-10-05 | 5810-006-0930 | 3.20 ppm |
2017-10-05 | 5810-007-0845 | 6.20 ppm |
2017-10-05 | 5810-008-1000 | 8.50 ppm |
2017-10-05 | 5810-009-1005 | 6.70 ppm |
2017-10-05 | 5810-010-0825 | 5.30 ppm |
2017-10-05 | 5810-011-0750 | 5.90 ppm |
2017-11-20 | 5810-008-1325 | 8.10 ppm |
2017-12-14 | 5810-008-0957 | 8.20 ppm |
2018-01-17 | 5810-001-0835 | 5.20 ppm |
2018-01-17 | 5810-004-0750 | 2.40 ppm |
2018-01-17 | 5810-006-0945 | 3.60 ppm |
2018-01-17 | 5810-007-1005 | 6.20 ppm |
2018-01-17 | 5810-008-1035 | 8.30 ppm |
2018-01-17 | 5810-009-1045 | 7.00 ppm |
2018-01-17 | 5810-010-0815 | 5.80 ppm |
2018-01-17 | 5810-011-0910 | 5.00 ppm |
2018-02-14 | 5810-008-0808 | 8.30 ppm |
2018-02-28 | 5810-002-1320 | 5.90 ppm |
2018-03-12 | 1610-008-0805 | 7.80 ppm |
2018-04-09 | 1610-001-0955 | 5.60 ppm |
2018-04-09 | 1610-004-1042 | 3.50 ppm |
2018-04-09 | 1610-006-0757 | 4.00 ppm |
2018-04-09 | 1610-007-0837 | 6.60 ppm |
2018-04-09 | 1610-008-0858 | 8.20 ppm |
2018-04-09 | 1610-009-0905 | 6.40 ppm |
2018-04-09 | 1610-010-0936 | 8.00 ppm |
2018-04-09 | 1610-011-1018 | 5.00 ppm |
2018-05-03 | 1610-004-0835 | 2.50 ppm |
2018-05-03 | 1610-006-1106 | 3.90 ppm |
2018-05-03 | 1610-007-1030 | 6.90 ppm |
2018-05-03 | 1610-008-0755 | 8.50 ppm |
2018-05-03 | 1610-009-0815 | 4.20 ppm |
2018-05-03 | 1610-010-1000 | 8.40 ppm |
2018-05-03 | 1610-011-0930 | 5.00 ppm |
2018-06-04 | 1610-002-0820 | 6.30 ppm |
2018-06-04 | 1610-002-0825 | 6.30 ppm |
2018-06-04 | 1610-008-0835 | 8.50 ppm |
2018-07-09 | 1610-001-0907 | 6.60 ppm |
2018-07-09 | 1610-002-0929 | 6.00 ppm |
2018-07-09 | 1610-004-0947 | 2.70 ppm |
2018-07-09 | 1610-006-0758 | 3.70 ppm |
2018-07-09 | 1610-007-0849 | 6.70 ppm |
2018-07-09 | 1610-008-0825 | 8.50 ppm |
2018-07-09 | 1610-009-0830 | 3.90 ppm |
2018-07-09 | 1610-010-1039 | 8.30 ppm |
2018-07-09 | 1610-011-1010 | 5.00 ppm |
2018-08-13 | 1610-008-0955 | 8.30 ppm |
2018-09-05 | 1610-008-1255 | 8.40 ppm |
2018-10-08 | 1610-001-0855 | 6.10 ppm |
2018-10-08 | 1610-002-0911 | 5.40 ppm |
2018-10-08 | 1610-004-0930 | 2.80 ppm |
2018-10-08 | 1610-006-1059 | 3.60 ppm |
2018-10-08 | 1610-007-0757 | 6.90 ppm |
2018-10-08 | 1610-008-1028 | 8.60 ppm |
2018-10-08 | 1610-009-1031 | 5.50 ppm |
2018-10-08 | 1610-010-0822 | 6.50 ppm |
2018-10-08 | 1610-011-1008 | 5.30 ppm |
2018-11-13 | 1610-008-0945 | 8.40 ppm |
2018-12-17 | 1610-008-0945 | 8.50 ppm |
2019-01-07 | 1610-001-0852 | 4.50 ppm |
2019-01-07 | 1610-002-0830 | 4.90 ppm |
2019-01-07 | 1610-004-0817 | 2.70 ppm |
2019-01-07 | 1610-006-0925 | 3.80 ppm |
2019-01-07 | 1610-007-0908 | 6.40 ppm |
2019-01-07 | 1610-008-0936 | 7.30 ppm |
2019-01-07 | 1610-009-0940 | 8.20 ppm |
2019-01-07 | 1610-010-0731 | 5.80 ppm |
2019-01-07 | 1610-011-0955 | 5.60 ppm |
2019-02-04 | 1610-008-0945 | 8.30 ppm |
2019-03-11 | 1610-008-0900 | 8.10 ppm |
2019-04-01 | 1610-001-0925 | 4.70 ppm |
2019-04-01 | 1610-002-0911 | 5.80 ppm |
2019-04-01 | 1610-004-0855 | 3.70 ppm |
2019-04-01 | 1610-006-1010 | 3.60 ppm |
2019-04-01 | 1610-008-1040 | 8.00 ppm |
2019-04-01 | 1610-009-1042 | 6.70 ppm |
2019-04-01 | 1610-010-0943 | 8.10 ppm |
2019-04-01 | 1610-011-0825 | 6.30 ppm |
2019-04-22 | 1610-007-0845 | 6.70 ppm |
2019-05-13 | 1610-008-0805 | 8.20 ppm |
2019-06-03 | 1610-008-1335 | 8.20 ppm |
2019-07-15 | 1610-001-0836 | 6.00 ppm |
2019-07-15 | 1610-004-0822 | 2.70 ppm |
2019-07-15 | 1610-006-0815 | 3.50 ppm |
2019-07-15 | 1610-007-0840 | 6.50 ppm |
2019-07-15 | 1610-008-0809 | 8.10 ppm |
2019-07-15 | 1610-009-0805 | 4.20 ppm |
2019-07-15 | 1610-010-0923 | 8.00 ppm |
2019-07-15 | 1610-011-0910 | 5.00 ppm |
2019-07-25 | 1610-002-0935 | 6.10 ppm |
2019-08-05 | 1610-008-0920 | 8.20 ppm |
2019-09-09 | 1610-008-0956 | 8.30 ppm |
2019-10-07 | 1610-001-1130 | 4.10 ppm |
2019-10-07 | 1610-002-1011 | 5.30 ppm |
2019-10-07 | 1610-004-0959 | 2.50 ppm |
2019-10-07 | 1610-006-0915 | 3.20 ppm |
2019-10-07 | 1610-007-0913 | 6.70 ppm |
2019-10-07 | 1610-008-0847 | 8.20 ppm |
2019-10-07 | 1610-009-0850 | 6.70 ppm |
2019-10-07 | 1610-010-0831 | 5.40 ppm |
2019-10-07 | 1610-011-0755 | 6.10 ppm |
2019-11-04 | 1610-008-0810 | 8.20 ppm |
2019-12-02 | 1610-008-1105 | 8.20 ppm |