Nitrate
California Water Service (CWS) - North Garden
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.
223
Samples
4
Samples exceeding legal limit (MCL)
196
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 2.59 ppm | 47 | 46 | ND - 11.5 ppm |
| 2015 | 2.63 ppm | 35 | 30 | ND - 11.9 ppm |
| 2016 | 3.01 ppm | 35 | 28 | ND - 12.0 ppm |
| 2017 | 2.97 ppm | 23 | 19 | ND - 5.73 ppm |
| 2018 | 3.06 ppm | 37 | 35 | ND - 5.62 ppm |
| 2019 | 3.27 ppm | 46 | 43 | ND - 6.49 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 |
|---|---|---|
| 2014-01-06 | 5701-025-0950 | 2.92 ppm |
| 2014-01-06 | 5701-026-0954 | 3.05 ppm |
| 2014-01-13 | 5701-011-1105 | 5.11 ppm |
| 2014-01-13 | 5701-026-0837 | 3.62 ppm |
| 2014-01-27 | 5701-010-1041 | 2.98 ppm |
| 2014-02-03 | 5701-026-0847 | 2.90 ppm |
| 2014-02-05 | 5810-034-0750 | ND |
| 2014-02-12 | 5701-008-0955 | 4.44 ppm |
| 2014-02-26 | 5701-004-1310 | 0.0357 ppm |
| 2014-02-26 | 5701-009-1020 | 0.589 ppm |
| 2014-02-26 | 5701-017-1025 | 0.644 ppm |
| 2014-03-11 | 5701-026-0915 | 3.14 ppm |
| 2014-03-11 | 5701-028-1245 | 2.76 ppm |
| 2014-04-02 | 5701-031-1016 | 0.00700 ppm |
| 2014-05-05 | 5701-026-1109 | 3.77 ppm |
| 2014-05-05 | 5701-027-0855 | 0.393 ppm |
| 2014-05-05 | 5701-028-0858 | 0.388 ppm |
| 2014-05-13 | 5701-008-0912 | 4.37 ppm |
| 2014-06-03 | 5701-026-1115 | 4.87 ppm |
| 2014-06-03 | 5701-028-1410 | 0.439 ppm |
| 2014-06-09 | 5701-011-1031 | 4.35 ppm |
| 2014-06-25 | 5806-005-1010 | 11.5 ppm |
| 2014-06-25 | 5806-011-1035 | 4.29 ppm |
| 2014-07-07 | 5701-011-0815 | 4.36 ppm |
| 2014-07-08 | 5701-028-0905 | 0.452 ppm |
| 2014-07-14 | 5701-025-0951 | 4.45 ppm |
| 2014-07-14 | 5701-026-0948 | 4.49 ppm |
| 2014-08-05 | 5701-026-1150 | 4.31 ppm |
| 2014-08-05 | 5701-027-1002 | 0.461 ppm |
| 2014-08-05 | 5701-028-1004 | 0.447 ppm |
| 2014-08-11 | 5701-008-0944 | 3.96 ppm |
| 2014-08-11 | 5701-013-0955 | 0.0867 ppm |
| 2014-08-11 | 5701-020-1001 | 0.0802 ppm |
| 2014-08-11 | 5701-030-0852 | 0.807 ppm |
| 2014-08-11 | 5701-032-0858 | 0.525 ppm |
| 2014-09-08 | 5701-028-0904 | 0.403 ppm |
| 2014-09-09 | 5701-026-1030 | 4.36 ppm |
| 2014-09-29 | 5701-006-0919 | 1.20 ppm |
| 2014-09-29 | 5701-016-0917 | 1.22 ppm |
| 2014-10-06 | 5701-011-1220 | 5.20 ppm |
| 2014-10-06 | 5701-025-1015 | 4.15 ppm |
| 2014-10-06 | 5701-026-1025 | 4.18 ppm |
| 2014-10-06 | 5701-028-1330 | 0.403 ppm |
| 2014-11-03 | 5701-026-0930 | 4.81 ppm |
| 2014-11-03 | 5701-028-1140 | 0.384 ppm |
| 2014-11-17 | 5701-008-0834 | 3.98 ppm |
| 2014-11-17 | 5701-027-0930 | 0.384 ppm |
| 2015-01-13 | 5701-011-1105 | 4.90 ppm |
| 2015-01-13 | 5701-025-1015 | 4.75 ppm |
| 2015-01-13 | 5701-026-1020 | 4.71 ppm |
| 2015-01-13 | 5701-028-1205 | 0.386 ppm |
| 2015-02-03 | 5806-027-1404 | 0.452 ppm |
| 2015-02-04 | 5806-010-1125 | 3.61 ppm |
| 2015-02-09 | 5701-028-0848 | 0.390 ppm |
| 2015-02-11 | 5701-008-1300 | 3.73 ppm |
| 2015-02-24 | 5806-034-0840 | ND |
| 2015-03-16 | 5701-004-1145 | 0.207 ppm |
| 2015-04-13 | 5701-011-1105 | 4.98 ppm |
| 2015-04-13 | 5701-026-0937 | 3.32 ppm |
| 2015-04-14 | 5806-034-1330 | ND |
| 2015-04-20 | 5701-031-0837 | 0.00542 ppm |
| 2015-04-20 | 5701-036-0839 | ND |
| 2015-05-13 | 5701-008-1215 | 3.62 ppm |
| 2015-05-18 | 5701-028-1255 | 0.447 ppm |
| 2015-07-07 | 5701-011-1029 | 3.98 ppm |
| 2015-07-13 | 5701-025-1057 | 4.92 ppm |
| 2015-07-13 | 5701-026-1059 | 4.90 ppm |
| 2015-08-19 | 5701-008-1017 | 3.41 ppm |
| 2015-08-19 | 5701-028-1335 | 1.65 ppm |
| 2015-08-24 | 5701-030-1010 | 1.26 ppm |
| 2015-08-24 | 5701-032-1015 | 1.28 ppm |
| 2015-10-06 | 5701-011-1526 | 4.52 ppm |
| 2015-10-13 | 5701-026-1200 | 4.94 ppm |
| 2015-10-19 | 5701-013-0940 | ND |
| 2015-10-19 | 5701-020-0945 | ND |
| 2015-11-03 | 5701-028-1226 | 1.85 ppm |
| 2015-11-04 | 5806-013-1012 | 0.170 ppm |
| 2015-11-16 | 5701-008-0955 | 3.50 ppm |
| 2015-12-01 | 5701-006-1333 | 3.49 ppm |
| 2015-12-01 | 5701-009-1311 | 1.08 ppm |
| 2015-12-07 | 5806-008-1225 | 3.60 ppm |
| 2015-12-21 | 5701-005-1140 | 11.9 ppm |
| 2016-01-05 | 5701-026-1025 | 4.94 ppm |
| 2016-02-01 | 5701-027-1350 | 3.71 ppm |
| 2016-02-01 | 5701-028-1400 | 3.41 ppm |
| 2016-02-22 | 5701-010-1427 | 4.01 ppm |
| 2016-03-17 | 5806-004-0817 | ND |
| 2016-04-07 | 5806-031-1103 | ND |
| 2016-04-11 | 5701-026-1227 | 5.09 ppm |
| 2016-04-12 | 5701-031-1121 | ND |
| 2016-04-12 | 5701-036-1123 | ND |
| 2016-05-09 | 5806-006-1140 | 2.30 ppm |
| 2016-05-09 | 5701-028-0933 | 1.84 ppm |
| 2016-05-11 | 5806-011-0946 | 3.80 ppm |
| 2016-05-11 | 5701-011-0950 | 3.82 ppm |
| 2016-05-23 | 5701-006-0945 | 1.64 ppm |
| 2016-05-23 | 5701-016-0947 | 1.71 ppm |
| 2016-05-26 | 5806-034-0900 | ND |
| 2016-06-22 | 5701-008-1000 | 3.62 ppm |
| 2016-07-07 | 5806-025-0840 | 4.00 ppm |
| 2016-07-12 | 5701-011-0945 | 3.45 ppm |
| 2016-07-25 | 5701-025-0925 | 3.99 ppm |
| 2016-07-25 | 5701-026-0930 | 4.04 ppm |
| 2016-08-08 | 5806-030-0945 | 1.000 ppm |
| 2016-08-16 | 5701-008-1140 | 3.40 ppm |
| 2016-08-16 | 5701-013-1427 | ND |
| 2016-08-16 | 5701-020-1430 | ND |
| 2016-08-16 | 5701-028-1120 | 0.585 ppm |
| 2016-08-16 | 5701-030-0915 | 1.33 ppm |
| 2016-08-16 | 5701-032-0917 | 1.31 ppm |
| 2016-10-03 | 5701-011-1050 | 3.56 ppm |
| 2016-10-11 | 5806-005-1200 | 12.0 ppm |
| 2016-10-11 | 5806-005-1230 | 12.0 ppm |
| 2016-10-12 | 5701-025-1014 | 5.52 ppm |
| 2016-10-12 | 5701-026-1018 | 5.57 ppm |
| 2016-10-24 | 5806-009-1215 | 0.650 ppm |
| 2016-10-31 | 5701-008-1245 | 3.17 ppm |
| 2017-01-09 | 5701-011-1145 | 3.86 ppm |
| 2017-01-09 | 5701-025-1000 | 5.24 ppm |
| 2017-02-13 | 5701-027-0901 | 4.55 ppm |
| 2017-02-14 | 5701-008-0900 | 3.09 ppm |
| 2017-02-14 | 5701-010-0930 | 4.09 ppm |
| 2017-03-27 | 5701-004-0918 | ND |
| 2017-03-27 | 5701-009-1052 | 0.472 ppm |
| 2017-04-17 | 5701-011-1411 | 3.05 ppm |
| 2017-04-17 | 5701-025-1310 | 5.26 ppm |
| 2017-04-17 | 5701-031-1205 | ND |
| 2017-05-02 | 5806-008-1000 | 3.40 ppm |
| 2017-05-10 | 5701-006-1430 | 2.88 ppm |
| 2017-05-10 | 5701-008-1015 | 2.97 ppm |
| 2017-05-19 | 5806-034-0935 | ND |
| 2017-07-17 | 5701-011-1249 | 2.71 ppm |
| 2017-07-17 | 5701-025-0945 | 4.10 ppm |
| 2017-08-01 | 5701-013-1400 | ND |
| 2017-08-01 | 5701-030-0930 | 0.650 ppm |
| 2017-08-16 | 5701-008-0950 | 2.94 ppm |
| 2017-09-25 | 5701-011-1123 | 3.16 ppm |
| 2017-09-25 | 5701-025-0902 | 4.78 ppm |
| 2017-10-10 | 5701-025-1542 | 5.47 ppm |
| 2017-11-21 | 5701-008-1445 | 5.73 ppm |
| 2018-01-16 | 5701-011-1344 | 3.13 ppm |
| 2018-02-06 | 5701-038-1043 | 2.62 ppm |
| 2018-02-07 | 5806-010-1435 | 4.20 ppm |
| 2018-03-06 | 5701-038-0909 | 3.34 ppm |
| 2018-03-14 | 5701-004-0856 | ND |
| 2018-03-14 | 5701-010-1303 | 4.21 ppm |
| 2018-03-19 | 5701-008-1510 | 4.18 ppm |
| 2018-04-02 | 5701-011-1114 | 2.53 ppm |
| 2018-04-02 | 5701-038-1124 | 2.49 ppm |
| 2018-04-03 | 5701-031-1019 | ND |
| 2018-04-12 | 5806-027-1449 | 2.60 ppm |
| 2018-04-16 | 5701-027-1218 | 1.87 ppm |
| 2018-05-15 | 5701-006-0920 | 3.17 ppm |
| 2018-05-15 | 5701-008-1130 | 2.98 ppm |
| 2018-05-15 | 5701-038-0855 | 2.85 ppm |
| 2018-06-18 | 5701-009-1124 | 0.982 ppm |
| 2018-07-11 | 5701-011-1042 | 2.91 ppm |
| 2018-07-11 | 5701-038-1037 | 2.99 ppm |
| 2018-07-30 | 1610-026-0905 | 4.80 ppm |
| 2018-07-30 | 1610-025-0900 | 4.10 ppm |
| 2018-07-31 | 5701-030-0830 | 0.853 ppm |
| 2018-08-07 | 5701-038-0815 | 2.86 ppm |
| 2018-08-08 | 5701-008-1335 | 3.00 ppm |
| 2018-08-20 | 5701-026-1100 | 4.61 ppm |
| 2018-08-20 | 5701-025-1055 | 4.54 ppm |
| 2018-09-11 | 5701-026-1415 | 4.48 ppm |
| 2018-09-11 | 5701-038-1319 | 3.21 ppm |
| 2018-10-02 | 5701-011-0900 | 3.28 ppm |
| 2018-10-02 | 5701-026-0935 | 4.17 ppm |
| 2018-10-02 | 5701-038-0905 | 3.04 ppm |
| 2018-11-08 | 5806-013-1426 | 0.200 ppm |
| 2018-11-13 | 5701-026-0935 | 4.31 ppm |
| 2018-11-13 | 5701-025-0930 | 3.90 ppm |
| 2018-11-13 | 5701-038-0900 | 3.27 ppm |
| 2018-11-26 | 5701-008-1400 | 2.62 ppm |
| 2018-12-04 | 5701-026-1015 | 5.62 ppm |
| 2018-12-04 | 5701-038-1442 | 3.15 ppm |
| 2019-01-08 | 5701-011-1225 | 3.17 ppm |
| 2019-01-08 | 5701-026-1340 | 4.61 ppm |
| 2019-01-08 | 5701-038-1230 | 3.29 ppm |
| 2019-02-05 | 5701-027-1259 | 2.05 ppm |
| 2019-02-12 | 5701-038-1320 | 3.64 ppm |
| 2019-02-13 | 5701-026-1047 | 6.49 ppm |
| 2019-02-13 | 5701-025-1032 | 5.57 ppm |
| 2019-02-19 | 5701-008-1225 | 4.46 ppm |
| 2019-02-25 | 5701-010-1040 | 4.31 ppm |
| 2019-03-05 | 5701-026-0832 | 5.45 ppm |
| 2019-03-05 | 5701-038-1002 | 3.57 ppm |
| 2019-03-19 | 5806-009-0931 | 1.30 ppm |
| 2019-04-03 | 2385-011-1147 | 3.40 ppm |
| 2019-04-03 | 2385-026-0942 | 5.00 ppm |
| 2019-04-03 | 2385-038-1157 | 3.40 ppm |
| 2019-04-10 | 5806-031-1450 | ND |
| 2019-05-07 | 5701-026-0822 | 4.07 ppm |
| 2019-05-07 | 5701-025-0802 | 3.89 ppm |
| 2019-05-07 | 5701-038-0956 | 2.65 ppm |
| 2019-05-13 | 5806-006-1218 | 2.90 ppm |
| 2019-05-13 | 5806-011-1116 | 2.70 ppm |
| 2019-05-13 | 5806-034-0830 | ND |
| 2019-05-15 | 5701-008-1350 | 2.74 ppm |
| 2019-06-10 | 5701-026-0840 | 3.75 ppm |
| 2019-06-10 | 5701-038-1116 | 2.57 ppm |
| 2019-07-17 | 5701-011-1012 | 2.56 ppm |
| 2019-07-17 | 5701-026-0900 | 4.05 ppm |
| 2019-07-17 | 5806-025-0848 | 4.20 ppm |
| 2019-07-17 | 5701-038-1017 | 2.73 ppm |
| 2019-08-05 | 5701-026-1004 | 3.99 ppm |
| 2019-08-05 | 5701-025-1010 | 4.08 ppm |
| 2019-08-05 | 5701-038-0925 | 2.56 ppm |
| 2019-08-12 | 5701-008-1035 | 2.83 ppm |
| 2019-08-12 | 5701-013-1245 | ND |
| 2019-08-27 | 5806-030-1105 | 0.900 ppm |
| 2019-09-09 | 5701-026-0910 | 3.79 ppm |
| 2019-09-09 | 5701-038-1011 | 2.81 ppm |
| 2019-10-09 | 5701-026-0755 | 3.74 ppm |
| 2019-10-15 | 5701-011-1010 | 2.70 ppm |
| 2019-10-15 | 5701-038-1015 | 2.72 ppm |
| 2019-11-13 | 5701-026-0900 | 3.90 ppm |
| 2019-11-13 | 5701-025-0905 | 3.51 ppm |
| 2019-11-13 | 5701-038-1155 | 2.96 ppm |
| 2019-11-20 | 2385-008-1144 | 3.10 ppm |
| 2019-12-03 | 5701-026-0930 | 5.37 ppm |
| 2019-12-03 | 5701-038-1240 | 2.93 ppm |