Nitrate
Crescenta Valley CWD
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 |
---|---|---|---|---|
2013 | N/A | 0 | 0 | N/A |
2014 | 3.89 ppm | 47 | 47 | 2.10 ppm - 6.10 ppm |
2015 | 4.11 ppm | 52 | 52 | 1.29 ppm - 6.33 ppm |
2016 | 4.17 ppm | 53 | 53 | 2.30 ppm - 6.70 ppm |
2017 | 4.18 ppm | 52 | 52 | 1.80 ppm - 7.10 ppm |
2018 | 4.11 ppm | 52 | 52 | 1.90 ppm - 7.00 ppm |
2019 | 4.38 ppm | 83 | 83 | 1.30 ppm - 8.00 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 |
---|---|---|
2014-01-14 | 5806-014-1010 | 2.94 ppm |
2014-01-21 | 5806-014-1002 | 2.94 ppm |
2014-01-28 | 5806-014-1020 | 2.94 ppm |
2014-02-04 | 5806-014-1204 | 3.39 ppm |
2014-02-11 | 5806-014-1003 | 4.07 ppm |
2014-02-18 | 5806-014-1049 | 3.61 ppm |
2014-02-25 | 5806-014-1023 | 4.07 ppm |
2014-03-04 | 5806-014-1115 | 5.42 ppm |
2014-03-11 | 5806-014-0938 | 4.52 ppm |
2014-03-18 | 5806-014-1132 | 4.52 ppm |
2014-03-25 | 5806-014-0958 | 4.74 ppm |
2014-04-01 | 5806-014-1040 | 4.74 ppm |
2014-04-08 | 5806-014-0913 | 5.20 ppm |
2014-04-15 | 5806-014-0946 | 3.39 ppm |
2014-04-22 | 5806-014-0949 | 3.84 ppm |
2014-04-29 | 5806-014-1000 | 3.16 ppm |
2014-05-06 | 5806-014-1031 | 2.48 ppm |
2014-05-13 | 5806-014-1041 | 2.94 ppm |
2014-05-20 | 5806-014-1127 | 3.16 ppm |
2014-05-27 | 5806-014-1004 | 3.84 ppm |
2014-06-03 | 5806-014-0950 | 3.61 ppm |
2014-06-10 | 5806-014-1034 | 3.39 ppm |
2014-06-17 | 5806-014-1144 | 3.61 ppm |
2014-06-24 | 5806-014-1017 | 3.84 ppm |
2014-07-01 | 5806-014-0858 | 4.97 ppm |
2014-07-08 | 5806-014-1034 | 4.74 ppm |
2014-07-15 | 5806-014-1030 | 3.84 ppm |
2014-07-22 | 5806-014-0950 | 4.52 ppm |
2014-07-29 | 5806-014-0950 | 3.84 ppm |
2014-08-05 | 5806-014-1115 | 3.39 ppm |
2014-08-05 | 5806-014-1117 | 2.94 ppm |
2014-08-12 | 5806-014-0905 | 3.39 ppm |
2014-08-19 | 5806-014-0949 | 4.29 ppm |
2014-08-26 | 5806-014-1020 | 2.94 ppm |
2014-09-02 | 5806-014-1108 | 2.10 ppm |
2014-09-09 | 5806-014-1108 | 3.16 ppm |
2014-09-16 | 5806-014-1019 | 4.07 ppm |
2014-09-23 | 5806-014-1115 | 4.52 ppm |
2014-09-30 | 5806-014-0933 | 4.74 ppm |
2014-10-07 | 5806-014-1010 | 4.52 ppm |
2014-10-14 | 5806-014-1036 | 4.29 ppm |
2014-10-28 | 5806-014-1032 | 4.07 ppm |
2014-11-06 | 5806-014-1001 | 4.97 ppm |
2014-12-09 | 5806-014-1016 | 6.10 ppm |
2014-12-16 | 5806-014-1207 | 4.52 ppm |
2014-12-23 | 5806-014-0956 | 2.94 ppm |
2014-12-30 | 5806-014-1026 | 3.61 ppm |
2015-01-06 | 5806-014-0954 | 5.87 ppm |
2015-01-13 | 5806-014-0928 | 5.65 ppm |
2015-01-20 | 5806-014-0926 | 5.87 ppm |
2015-01-27 | 5806-014-1123 | 6.10 ppm |
2015-02-03 | 5806-014-0803 | 3.84 ppm |
2015-02-10 | 5806-014-1056 | 5.42 ppm |
2015-02-17 | 5806-014-1027 | 2.71 ppm |
2015-02-24 | 5806-014-1051 | 4.74 ppm |
2015-03-03 | 5806-014-1141 | 4.07 ppm |
2015-03-10 | 5806-014-0949 | 5.65 ppm |
2015-03-17 | 5806-014-0942 | 3.84 ppm |
2015-03-24 | 5806-014-1200 | 5.42 ppm |
2015-03-31 | 5806-014-0952 | 4.29 ppm |
2015-04-07 | 5806-014-0947 | 6.33 ppm |
2015-04-14 | 5806-014-0950 | 5.20 ppm |
2015-04-21 | 5806-014-1028 | 4.74 ppm |
2015-04-28 | 5806-014-0945 | 5.42 ppm |
2015-05-05 | 5806-014-0950 | 5.42 ppm |
2015-05-13 | 5806-014-0930 | 4.74 ppm |
2015-05-19 | 5806-014-1043 | 4.97 ppm |
2015-05-26 | 5806-014-1045 | 5.87 ppm |
2015-06-02 | 5806-014-0920 | 4.07 ppm |
2015-06-09 | 5806-014-0947 | 4.97 ppm |
2015-06-16 | 5806-014-1215 | 4.29 ppm |
2015-06-23 | 5806-014-1012 | 2.94 ppm |
2015-06-30 | 5806-014-0955 | 2.71 ppm |
2015-07-07 | 5806-014-1016 | 2.71 ppm |
2015-07-14 | 5806-014-0841 | 4.52 ppm |
2015-07-21 | 5806-014-0933 | 4.52 ppm |
2015-07-28 | 5806-014-1015 | 4.74 ppm |
2015-08-04 | 5806-014-1048 | 4.07 ppm |
2015-08-11 | 5806-014-0920 | 4.07 ppm |
2015-08-18 | 5806-014-1120 | 4.07 ppm |
2015-08-25 | 5806-014-0903 | 3.61 ppm |
2015-09-02 | 5806-014-1019 | 3.84 ppm |
2015-09-08 | 5806-014-1031 | 3.84 ppm |
2015-09-16 | 5806-014-0931 | 3.61 ppm |
2015-09-22 | 5806-014-0946 | 4.29 ppm |
2015-09-29 | 5806-014-1039 | 4.07 ppm |
2015-10-06 | 5806-014-1030 | 2.01 ppm |
2015-10-13 | 5806-014-0827 | 2.01 ppm |
2015-10-20 | 5806-014-0910 | 1.29 ppm |
2015-10-27 | 5806-014-0928 | 1.58 ppm |
2015-11-03 | 5806-014-1017 | 2.19 ppm |
2015-11-10 | 5806-014-0955 | 4.20 ppm |
2015-11-17 | 5806-014-1001 | 3.00 ppm |
2015-11-24 | 5806-014-0958 | 4.30 ppm |
2015-12-01 | 5806-014-0940 | 2.50 ppm |
2015-12-08 | 5806-014-1011 | 2.90 ppm |
2015-12-15 | 5806-014-1101 | 2.00 ppm |
2015-12-22 | 5806-014-0942 | 4.10 ppm |
2015-12-29 | 5806-014-0952 | 4.50 ppm |
2016-01-05 | 5806-014-1048 | 4.80 ppm |
2016-01-12 | 5806-014-1049 | 4.90 ppm |
2016-01-19 | 5806-014-1005 | 4.80 ppm |
2016-01-26 | 5806-014-1008 | 4.60 ppm |
2016-02-02 | 5806-014-1024 | 5.20 ppm |
2016-02-09 | 5806-014-1008 | 6.50 ppm |
2016-02-16 | 5806-014-0955 | 6.30 ppm |
2016-02-23 | 5806-014-1020 | 6.70 ppm |
2016-03-01 | 5806-014-0836 | 6.00 ppm |
2016-03-08 | 5806-014-1000 | 6.00 ppm |
2016-03-16 | 5806-014-0940 | 6.50 ppm |
2016-03-22 | 5806-014-0954 | 4.50 ppm |
2016-03-29 | 5806-014-0940 | 5.40 ppm |
2016-04-06 | 5806-014-0915 | 5.10 ppm |
2016-04-12 | 5806-014-0926 | 5.10 ppm |
2016-04-19 | 5806-014-0930 | 5.00 ppm |
2016-04-26 | 5806-014-1004 | 5.20 ppm |
2016-05-03 | 5806-014-0933 | 3.80 ppm |
2016-05-04 | 5806-014-0933 | 3.70 ppm |
2016-05-10 | 5806-014-1013 | 4.70 ppm |
2016-05-17 | 5806-014-1037 | 3.90 ppm |
2016-05-24 | 5806-014-0933 | 3.50 ppm |
2016-05-31 | 5806-014-1003 | 3.10 ppm |
2016-06-07 | 5806-014-0907 | 3.60 ppm |
2016-06-14 | 5806-014-0845 | 3.10 ppm |
2016-06-21 | 5806-014-0927 | 3.80 ppm |
2016-06-28 | 5806-014-1020 | 4.80 ppm |
2016-07-05 | 5806-014-0901 | 3.40 ppm |
2016-07-12 | 5806-014-1022 | 3.00 ppm |
2016-07-19 | 5806-014-1128 | 3.20 ppm |
2016-07-26 | 5806-014-0817 | 4.40 ppm |
2016-08-02 | 5806-014-1252 | 3.50 ppm |
2016-08-09 | 5806-014-0949 | 4.10 ppm |
2016-08-16 | 5806-014-1041 | 3.60 ppm |
2016-08-23 | 5806-014-1043 | 3.40 ppm |
2016-08-30 | 5806-014-0917 | 3.50 ppm |
2016-09-06 | 5806-014-1109 | 4.20 ppm |
2016-09-13 | 5806-014-1023 | 3.20 ppm |
2016-09-20 | 5806-014-0939 | 4.60 ppm |
2016-09-27 | 5806-014-1050 | 3.40 ppm |
2016-10-04 | 5806-014-1059 | 3.40 ppm |
2016-10-11 | 5806-014-1044 | 3.10 ppm |
2016-10-18 | 5806-014-1058 | 3.50 ppm |
2016-10-25 | 5806-014-1027 | 2.90 ppm |
2016-11-01 | 5806-014-1017 | 2.70 ppm |
2016-11-08 | 5806-014-1009 | 2.30 ppm |
2016-11-15 | 5806-014-1250 | 2.50 ppm |
2016-11-22 | 5806-014-1001 | 3.50 ppm |
2016-11-29 | 5806-014-0942 | 3.60 ppm |
2016-12-06 | 5806-014-1101 | 3.00 ppm |
2016-12-13 | 5806-014-1112 | 2.70 ppm |
2016-12-20 | 5806-014-1013 | 4.30 ppm |
2016-12-27 | 5806-014-1038 | 5.20 ppm |
2017-01-03 | 5806-014-1120 | 6.00 ppm |
2017-01-10 | 5806-014-1121 | 6.20 ppm |
2017-01-17 | 5806-014-0945 | 6.60 ppm |
2017-01-24 | 5806-014-1019 | 6.70 ppm |
2017-01-31 | 5806-014-0856 | 6.10 ppm |
2017-02-07 | 5806-014-1001 | 6.00 ppm |
2017-02-14 | 5806-014-0902 | 6.10 ppm |
2017-02-21 | 5806-014-0959 | 6.20 ppm |
2017-02-28 | 5806-014-1025 | 6.20 ppm |
2017-03-07 | 5806-014-0957 | 5.80 ppm |
2017-03-14 | 5806-014-1032 | 3.80 ppm |
2017-03-21 | 5806-014-0835 | 4.20 ppm |
2017-03-28 | 5806-014-1050 | 4.80 ppm |
2017-04-04 | 5806-014-0850 | 3.40 ppm |
2017-04-11 | 5806-014-0947 | 3.30 ppm |
2017-04-18 | 5806-014-1043 | 3.80 ppm |
2017-04-25 | 5806-014-1049 | 2.60 ppm |
2017-05-02 | 5806-014-1023 | 2.20 ppm |
2017-05-09 | 5806-014-1010 | 2.10 ppm |
2017-05-16 | 5806-014-1103 | 3.00 ppm |
2017-05-23 | 5806-014-1009 | 2.00 ppm |
2017-05-30 | 5806-014-1035 | 1.80 ppm |
2017-06-06 | 5806-014-1313 | 2.50 ppm |
2017-06-13 | 5806-014-0921 | 2.30 ppm |
2017-06-20 | 5806-014-0954 | 2.20 ppm |
2017-06-27 | 5806-014-0746 | 3.40 ppm |
2017-07-05 | 5806-014-1145 | 4.10 ppm |
2017-07-11 | 5806-014-1017 | 3.70 ppm |
2017-07-18 | 5806-014-1022 | 3.60 ppm |
2017-07-25 | 5806-014-1311 | 3.10 ppm |
2017-08-01 | 5806-014-1150 | 2.90 ppm |
2017-08-08 | 5806-014-0950 | 2.90 ppm |
2017-08-15 | 5806-014-1111 | 2.60 ppm |
2017-08-22 | 5806-014-1206 | 3.00 ppm |
2017-08-29 | 5806-014-0926 | 2.80 ppm |
2017-09-05 | 5806-014-1125 | 2.60 ppm |
2017-09-12 | 5806-014-0920 | 3.00 ppm |
2017-09-19 | 5806-014-1121 | 2.60 ppm |
2017-09-26 | 5806-014-1105 | 3.90 ppm |
2017-10-03 | 5806-014-1041 | 4.70 ppm |
2017-10-10 | 5806-014-1002 | 7.10 ppm |
2017-10-17 | 5806-014-0948 | 3.50 ppm |
2017-10-24 | 5806-014-0943 | 3.50 ppm |
2017-10-31 | 5806-014-1130 | 5.00 ppm |
2017-11-07 | 5806-014-1127 | 6.00 ppm |
2017-11-14 | 5806-014-1030 | 6.50 ppm |
2017-11-21 | 5806-014-0957 | 4.00 ppm |
2017-11-28 | 5806-014-1131 | 5.80 ppm |
2017-12-06 | 5806-014-1130 | 4.70 ppm |
2017-12-12 | 5806-014-0918 | 5.90 ppm |
2017-12-19 | 5806-014-1020 | 5.50 ppm |
2017-12-27 | 5806-014-1121 | 5.10 ppm |
2018-01-03 | 5806-014-0800 | 5.20 ppm |
2018-01-10 | 5806-014-1000 | 6.90 ppm |
2018-01-16 | 5806-014-0957 | 5.70 ppm |
2018-01-23 | 5806-014-1040 | 4.40 ppm |
2018-01-30 | 5806-014-1105 | 4.30 ppm |
2018-02-06 | 5806-014-0950 | 3.70 ppm |
2018-02-13 | 5806-014-1003 | 4.30 ppm |
2018-02-20 | 5806-014-0909 | 4.00 ppm |
2018-02-27 | 5806-014-1029 | 4.40 ppm |
2018-03-06 | 5806-014-0845 | 5.00 ppm |
2018-03-13 | 5806-014-1000 | 6.30 ppm |
2018-03-20 | 5806-014-1000 | 5.60 ppm |
2018-03-27 | 5806-014-1000 | 7.00 ppm |
2018-04-03 | 5806-014-0901 | 4.40 ppm |
2018-04-10 | 5806-014-1033 | 4.10 ppm |
2018-04-17 | 5806-014-1000 | 4.70 ppm |
2018-04-24 | 5806-014-0952 | 4.00 ppm |
2018-05-02 | 5806-014-1106 | 4.10 ppm |
2018-05-08 | 5806-014-1041 | 4.80 ppm |
2018-05-15 | 5806-014-1126 | 3.70 ppm |
2018-05-22 | 5806-014-1031 | 4.80 ppm |
2018-05-30 | 5806-014-1029 | 4.90 ppm |
2018-06-05 | 5806-014-0853 | 4.80 ppm |
2018-06-12 | 5806-014-1048 | 3.90 ppm |
2018-06-19 | 5806-014-1109 | 4.10 ppm |
2018-06-26 | 5806-014-0826 | 5.70 ppm |
2018-07-03 | 5806-014-0945 | 5.80 ppm |
2018-07-10 | 5806-014-1202 | 3.40 ppm |
2018-07-18 | 5806-014-1010 | 3.30 ppm |
2018-07-24 | 5806-014-0906 | 3.20 ppm |
2018-07-31 | 5806-014-0955 | 2.70 ppm |
2018-08-09 | 5806-014-0859 | 3.20 ppm |
2018-08-14 | 5806-014-0943 | 2.90 ppm |
2018-08-21 | 5806-014-1028 | 3.30 ppm |
2018-08-28 | 5806-014-1127 | 5.00 ppm |
2018-09-04 | 5806-014-1300 | 3.30 ppm |
2018-09-11 | 5806-014-1019 | 3.70 ppm |
2018-09-18 | 5806-014-1032 | 1.90 ppm |
2018-09-25 | 5806-014-0948 | 3.00 ppm |
2018-10-02 | 5806-014-0900 | 3.20 ppm |
2018-10-09 | 5806-014-1015 | 2.10 ppm |
2018-10-16 | 5806-014-0917 | 2.40 ppm |
2018-10-23 | 5806-014-0922 | 2.90 ppm |
2018-10-30 | 5806-014-1120 | 3.00 ppm |
2018-11-06 | 5806-014-1240 | 2.40 ppm |
2018-11-13 | 5806-014-1038 | 2.90 ppm |
2018-11-20 | 5806-014-0952 | 3.70 ppm |
2018-11-27 | 5806-014-1148 | 3.60 ppm |
2018-12-04 | 5806-014-1153 | 5.70 ppm |
2018-12-11 | 5806-014-1042 | 4.90 ppm |
2018-12-18 | 5806-014-1010 | 3.70 ppm |
2018-12-26 | 5806-014-1026 | 3.50 ppm |
2019-01-02 | 5806-014-1227 | 3.20 ppm |
2019-01-08 | 5806-014-0857 | 3.70 ppm |
2019-01-15 | 5806-014-0840 | 5.10 ppm |
2019-01-22 | 5806-014-1116 | 6.10 ppm |
2019-01-29 | 5806-014-0904 | 5.60 ppm |
2019-02-06 | 5806-014-1146 | 5.40 ppm |
2019-02-12 | 5806-014-1008 | 7.80 ppm |
2019-02-12 | 5806-014-1041 | 7.70 ppm |
2019-02-19 | 5806-014-1113 | 6.10 ppm |
2019-02-26 | 5806-014-1120 | 5.90 ppm |
2019-03-05 | 5806-014-1154 | 5.20 ppm |
2019-03-12 | 5806-014-1154 | 6.20 ppm |
2019-03-19 | 5806-014-1131 | 5.30 ppm |
2019-03-26 | 5806-014-1059 | 6.70 ppm |
2019-04-02 | 5806-014-1040 | 6.40 ppm |
2019-04-09 | 5806-014-1102 | 4.80 ppm |
2019-04-16 | 5806-014-1218 | 5.10 ppm |
2019-04-23 | 5806-014-1050 | 5.80 ppm |
2019-04-29 | 5806-014-1104 | 3.60 ppm |
2019-05-07 | 5806-014-1128 | 6.50 ppm |
2019-05-14 | 5806-014-1238 | 5.90 ppm |
2019-05-21 | 5806-014-1036 | 4.10 ppm |
2019-05-28 | 5806-014-1120 | 6.40 ppm |
2019-06-04 | 5806-014-1144 | 4.00 ppm |
2019-06-11 | 5806-014-1031 | 4.20 ppm |
2019-06-18 | 5806-014-0850 | 3.90 ppm |
2019-06-18 | 5806-028-1108 | 2.00 ppm |
2019-06-25 | 5806-014-1249 | 4.40 ppm |
2019-06-25 | 5806-028-1003 | 3.80 ppm |
2019-07-02 | 5806-014-0844 | 3.20 ppm |
2019-07-02 | 5806-028-1232 | 3.80 ppm |
2019-07-09 | 5806-014-1016 | 4.10 ppm |
2019-07-09 | 5806-028-1154 | 4.10 ppm |
2019-07-15 | 5806-014-0946 | 3.80 ppm |
2019-07-15 | 5806-028-1017 | 3.90 ppm |
2019-07-23 | 5806-014-1010 | 3.40 ppm |
2019-07-23 | 5806-028-1146 | 4.00 ppm |
2019-07-29 | 5806-014-1138 | 3.20 ppm |
2019-07-29 | 5806-028-1210 | 3.70 ppm |
2019-08-06 | 5806-014-0858 | 3.40 ppm |
2019-08-06 | 5806-028-0958 | 1.60 ppm |
2019-08-13 | 5806-014-0848 | 3.40 ppm |
2019-08-13 | 5806-028-0920 | 3.90 ppm |
2019-08-20 | 5806-014-0900 | 3.60 ppm |
2019-08-20 | 5806-028-1206 | 4.00 ppm |
2019-08-27 | 5806-014-1028 | 3.70 ppm |
2019-08-27 | 5806-028-1058 | 3.80 ppm |
2019-09-03 | 5806-014-0911 | 3.40 ppm |
2019-09-03 | 5806-028-1240 | 3.70 ppm |
2019-09-03 | 5806-028-1243 | 1.80 ppm |
2019-09-10 | 5806-014-1055 | 3.70 ppm |
2019-09-10 | 5806-028-1111 | 4.00 ppm |
2019-09-17 | 5806-014-1156 | 3.80 ppm |
2019-09-17 | 5806-028-1040 | 4.30 ppm |
2019-09-24 | 5806-014-1106 | 3.60 ppm |
2019-09-24 | 5806-028-1135 | 3.80 ppm |
2019-10-01 | 5806-014-1021 | 3.80 ppm |
2019-10-01 | 5806-028-1123 | 4.20 ppm |
2019-10-01 | 5806-028-1131 | 8.00 ppm |
2019-10-08 | 5806-014-1015 | 3.30 ppm |
2019-10-08 | 5806-028-1049 | 4.10 ppm |
2019-10-15 | 5806-014-1106 | 3.60 ppm |
2019-10-15 | 5806-028-1202 | 4.00 ppm |
2019-10-22 | 5806-014-0844 | 3.40 ppm |
2019-10-22 | 5806-028-1122 | 4.10 ppm |
2019-10-30 | 5806-014-0912 | 3.80 ppm |
2019-11-04 | 5806-014-1018 | 3.80 ppm |
2019-11-04 | 5806-028-1138 | 1.50 ppm |
2019-11-04 | 5806-028-1227 | 3.90 ppm |
2019-11-11 | 5806-014-1047 | 4.70 ppm |
2019-11-11 | 5806-028-1220 | 4.60 ppm |
2019-11-19 | 5806-014-1214 | 4.20 ppm |
2019-11-19 | 5806-028-1149 | 4.20 ppm |
2019-11-25 | 5806-014-1143 | 5.10 ppm |
2019-11-25 | 5806-028-1050 | 4.00 ppm |
2019-12-03 | 5806-014-1056 | 6.10 ppm |
2019-12-03 | 5806-028-1148 | 1.30 ppm |
2019-12-03 | 5806-028-1154 | 4.30 ppm |
2019-12-10 | 5806-014-1002 | 6.20 ppm |
2019-12-16 | 5806-014-1056 | 6.10 ppm |
2019-12-23 | 5806-014-1118 | 4.10 ppm |
2019-12-30 | 5806-014-1010 | 4.40 ppm |
2019-12-30 | 5806-028-0910 | 4.80 ppm |