Nitrate
City of South Pasadena
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 | 5.71 ppm | 52 | 52 | 4.07 ppm - 7.91 ppm |
2015 | 5.58 ppm | 61 | 61 | 5.20 ppm - 5.87 ppm |
2016 | 5.40 ppm | 45 | 45 | 5.00 ppm - 6.20 ppm |
2017 | 5.12 ppm | 51 | 51 | 4.60 ppm - 5.50 ppm |
2018 | 4.52 ppm | 13 | 13 | 1.80 ppm - 5.30 ppm |
2019 | N/A | 0 | 0 | N/A |
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 |
---|---|---|
2014-01-07 | 9590-007-0906 | 5.65 ppm |
2014-01-14 | 9590-007-0942 | 5.87 ppm |
2014-01-21 | 9590-007-0958 | 5.87 ppm |
2014-01-28 | 9590-007-1010 | 5.87 ppm |
2014-02-04 | 9590-007-1010 | 5.87 ppm |
2014-02-11 | 9590-007-0905 | 5.65 ppm |
2014-02-18 | 9590-007-0910 | 5.65 ppm |
2014-02-25 | 9590-007-0959 | 5.87 ppm |
2014-03-04 | 9590-007-0934 | 5.65 ppm |
2014-03-11 | 9590-007-1000 | 5.65 ppm |
2014-03-18 | 9590-007-1000 | 5.65 ppm |
2014-03-25 | 9590-007-0910 | 5.65 ppm |
2014-04-01 | 9590-007-0925 | 5.65 ppm |
2014-04-08 | 9590-007-0933 | 5.42 ppm |
2014-04-15 | 9590-007-0950 | 5.65 ppm |
2014-04-22 | 9590-007-1010 | 5.65 ppm |
2014-04-29 | 9590-007-1000 | 5.65 ppm |
2014-05-06 | 9590-007-0917 | 5.87 ppm |
2014-05-13 | 9590-007-0910 | 5.65 ppm |
2014-05-20 | 9590-007-1000 | 6.10 ppm |
2014-05-27 | 9590-007-0935 | 5.65 ppm |
2014-06-03 | 9590-007-0957 | 5.65 ppm |
2014-06-10 | 9590-007-0942 | 5.65 ppm |
2014-06-17 | 9590-007-0920 | 5.65 ppm |
2014-06-24 | 9590-007-0932 | 5.65 ppm |
2014-07-01 | 9590-007-1009 | 4.97 ppm |
2014-07-08 | 9590-007-1000 | 4.07 ppm |
2014-07-15 | 9590-007-1030 | 4.52 ppm |
2014-07-22 | 9590-007-1005 | 5.65 ppm |
2014-07-29 | 9590-007-0915 | 5.65 ppm |
2014-08-05 | 9590-007-0902 | 6.10 ppm |
2014-08-12 | 9590-007-0956 | 5.87 ppm |
2014-08-19 | 9590-007-1005 | 5.87 ppm |
2014-08-26 | 9590-007-1005 | 5.87 ppm |
2014-09-02 | 9590-007-1025 | 5.42 ppm |
2014-09-09 | 9590-007-0916 | 5.87 ppm |
2014-09-16 | 9590-007-0907 | 5.87 ppm |
2014-09-23 | 9590-007-1000 | 7.45 ppm |
2014-09-30 | 9590-007-0932 | 5.65 ppm |
2014-10-07 | 9590-007-1015 | 5.65 ppm |
2014-10-14 | 9590-007-1010 | 5.20 ppm |
2014-10-21 | 9590-007-0920 | 5.65 ppm |
2014-10-28 | 9590-007-0914 | 5.87 ppm |
2014-11-04 | 9590-007-0950 | 5.87 ppm |
2014-11-12 | 9590-007-1000 | 5.42 ppm |
2014-11-18 | 9590-007-1000 | 5.87 ppm |
2014-11-24 | 9590-007-1115 | 5.42 ppm |
2014-12-01 | 9590-007-1431 | 7.91 ppm |
2014-12-09 | 9590-007-0915 | 5.42 ppm |
2014-12-15 | 9590-007-1003 | 5.42 ppm |
2014-12-23 | 9590-007-0943 | 5.87 ppm |
2014-12-30 | 9590-007-1010 | 5.87 ppm |
2015-01-06 | 9590-007-1010 | 5.42 ppm |
2015-01-13 | 9590-007-1040 | 5.20 ppm |
2015-01-20 | 9590-007-0947 | 5.42 ppm |
2015-01-27 | 9590-007-1010 | 5.65 ppm |
2015-02-03 | 9590-007-0958 | 5.65 ppm |
2015-02-10 | 9590-007-1030 | 5.87 ppm |
2015-02-17 | 9590-007-0750 | 5.87 ppm |
2015-02-24 | 9590-007-0854 | 5.87 ppm |
2015-03-03 | 9590-007-0900 | 5.42 ppm |
2015-03-10 | 9590-007-0953 | 5.65 ppm |
2015-03-17 | 9590-007-1000 | 5.65 ppm |
2015-03-24 | 9590-007-1010 | 5.65 ppm |
2015-03-31 | 9590-007-1005 | 5.87 ppm |
2015-04-07 | 9590-007-0900 | 5.87 ppm |
2015-04-14 | 9590-007-0904 | 5.87 ppm |
2015-04-21 | 9590-007-1010 | 5.65 ppm |
2015-04-28 | 9590-007-1010 | 5.87 ppm |
2015-05-05 | 9590-007-0905 | 5.87 ppm |
2015-05-12 | 9590-007-0940 | 5.65 ppm |
2015-05-19 | 9590-007-0852 | 5.65 ppm |
2015-05-26 | 9590-007-0855 | 5.42 ppm |
2015-06-02 | 9590-007-0930 | 5.87 ppm |
2015-06-09 | 9590-007-0915 | 5.65 ppm |
2015-06-16 | 9590-007-0844 | 5.65 ppm |
2015-06-23 | 9590-007-1030 | 5.65 ppm |
2015-06-30 | 9590-007-0912 | 5.42 ppm |
2015-07-07 | 9590-007-0953 | 5.42 ppm |
2015-07-14 | 9590-007-0945 | 5.65 ppm |
2015-07-22 | 9590-007-0930 | 5.65 ppm |
2015-07-28 | 9590-007-0930 | 5.87 ppm |
2015-08-04 | 9590-007-1010 | 5.42 ppm |
2015-08-11 | 9590-007-0847 | 5.65 ppm |
2015-08-18 | 9590-007-0857 | 5.87 ppm |
2015-08-25 | 9590-007-0925 | 5.65 ppm |
2015-09-01 | 9590-007-0935 | 5.65 ppm |
2015-09-08 | 9590-007-1020 | 5.65 ppm |
2015-09-14 | 9590-007-1200 | 5.65 ppm |
2015-09-21 | 9590-007-0900 | 5.65 ppm |
2015-09-29 | 9590-007-0845 | 5.65 ppm |
2015-10-06 | 9590-007-0925 | 5.65 ppm |
2015-10-13 | 9590-007-1000 | 5.42 ppm |
2015-10-20 | 9590-007-1010 | 5.65 ppm |
2015-10-27 | 9590-007-1020 | 5.42 ppm |
2015-11-02 | 9590-007-0935 | 5.50 ppm |
2015-11-02 | 9590-007-0935 | 5.42 ppm |
2015-11-10 | 9590-007-0945 | 5.30 ppm |
2015-11-10 | 9590-007-0945 | 5.42 ppm |
2015-11-17 | 9590-007-0850 | 5.50 ppm |
2015-11-17 | 9590-007-0850 | 5.42 ppm |
2015-11-23 | 9590-007-1024 | 5.60 ppm |
2015-11-23 | 9590-007-1024 | 5.65 ppm |
2015-12-01 | 9590-007-1005 | 5.40 ppm |
2015-12-01 | 9590-007-1005 | 5.42 ppm |
2015-12-08 | 9590-007-1005 | 5.50 ppm |
2015-12-08 | 9590-007-1005 | 5.42 ppm |
2015-12-15 | 9590-007-0920 | 5.40 ppm |
2015-12-15 | 9590-007-0920 | 5.42 ppm |
2015-12-21 | 9590-007-1000 | 5.40 ppm |
2015-12-21 | 9590-007-1000 | 5.42 ppm |
2015-12-28 | 9590-007-0940 | 5.20 ppm |
2015-12-28 | 9590-007-0940 | 5.20 ppm |
2016-01-04 | 9590-007-0900 | 5.30 ppm |
2016-01-12 | 9590-007-1020 | 5.00 ppm |
2016-01-18 | 9590-007-1025 | 5.20 ppm |
2016-01-26 | 9590-007-0912 | 5.40 ppm |
2016-02-02 | 9590-007-0910 | 5.00 ppm |
2016-02-09 | 9590-007-0900 | 5.50 ppm |
2016-02-16 | 9590-007-1015 | 5.40 ppm |
2016-02-23 | 9590-007-1015 | 5.10 ppm |
2016-03-01 | 9590-007-1010 | 5.50 ppm |
2016-03-08 | 9590-007-0700 | 5.60 ppm |
2016-03-15 | 9590-007-0910 | 5.60 ppm |
2016-03-22 | 9590-007-0930 | 5.40 ppm |
2016-03-29 | 9590-007-0930 | 5.50 ppm |
2016-04-05 | 9590-007-1000 | 5.40 ppm |
2016-04-12 | 9590-007-1025 | 5.60 ppm |
2016-04-19 | 9590-007-0900 | 5.70 ppm |
2016-04-25 | 9590-007-0930 | 5.40 ppm |
2016-05-02 | 9590-007-0935 | 5.60 ppm |
2016-05-10 | 9590-007-0945 | 5.60 ppm |
2016-05-17 | 9590-007-0827 | 5.30 ppm |
2016-05-24 | 9590-007-0945 | 5.50 ppm |
2016-05-31 | 9590-007-0912 | 5.20 ppm |
2016-06-07 | 9590-007-0910 | 5.40 ppm |
2016-06-14 | 9590-007-0940 | 5.40 ppm |
2016-06-28 | 9590-007-1000 | 5.20 ppm |
2016-07-05 | 9590-007-1030 | 5.50 ppm |
2016-07-12 | 9590-007-0910 | 5.40 ppm |
2016-07-19 | 9590-007-0905 | 6.20 ppm |
2016-07-26 | 9590-007-0930 | 5.60 ppm |
2016-08-02 | 9590-007-1030 | 5.70 ppm |
2016-08-09 | 9590-007-0910 | 5.40 ppm |
2016-08-16 | 9590-007-1030 | 5.40 ppm |
2016-08-23 | 9590-007-0857 | 5.40 ppm |
2016-09-06 | 9590-007-0930 | 5.30 ppm |
2016-09-13 | 9590-007-0920 | 5.40 ppm |
2016-10-04 | 9590-007-0915 | 5.30 ppm |
2016-10-11 | 9590-007-0922 | 5.20 ppm |
2016-10-18 | 9590-007-0930 | 5.30 ppm |
2016-10-25 | 9590-007-0930 | 5.20 ppm |
2016-11-01 | 9590-007-1005 | 5.10 ppm |
2016-11-08 | 9590-007-1040 | 5.40 ppm |
2016-11-15 | 9590-007-0900 | 5.50 ppm |
2016-11-21 | 9590-007-0920 | 5.30 ppm |
2016-11-29 | 9590-007-0920 | 5.40 ppm |
2016-12-12 | 9590-007-1005 | 5.30 ppm |
2017-01-10 | 9590-007-0915 | 4.80 ppm |
2017-01-17 | 9590-007-0730 | 4.80 ppm |
2017-01-24 | 9590-007-1010 | 4.70 ppm |
2017-01-31 | 9590-007-1015 | 4.90 ppm |
2017-02-07 | 9590-007-0935 | 4.80 ppm |
2017-02-14 | 9590-007-0930 | 4.70 ppm |
2017-02-21 | 9590-007-0930 | 4.90 ppm |
2017-02-28 | 9590-007-0945 | 4.70 ppm |
2017-03-06 | 9590-007-1005 | 4.60 ppm |
2017-03-14 | 9590-007-1010 | 5.20 ppm |
2017-03-20 | 9590-007-0905 | 5.40 ppm |
2017-03-28 | 9590-007-0840 | 5.20 ppm |
2017-04-04 | 9590-007-0930 | 5.40 ppm |
2017-04-11 | 9590-007-0915 | 5.10 ppm |
2017-04-18 | 9590-007-1010 | 5.20 ppm |
2017-04-24 | 9590-007-1040 | 5.30 ppm |
2017-05-02 | 9590-007-0925 | 5.20 ppm |
2017-05-09 | 9590-007-0845 | 5.40 ppm |
2017-05-16 | 9590-007-1020 | 5.20 ppm |
2017-05-22 | 9590-007-0935 | 5.30 ppm |
2017-05-30 | 9590-007-1055 | 5.30 ppm |
2017-06-06 | 9590-007-1045 | 5.40 ppm |
2017-06-13 | 9590-007-0852 | 5.30 ppm |
2017-06-20 | 9590-007-0912 | 5.40 ppm |
2017-06-27 | 9590-007-0910 | 5.50 ppm |
2017-07-11 | 9590-007-1020 | 5.50 ppm |
2017-07-18 | 9590-007-1030 | 5.40 ppm |
2017-07-25 | 9590-007-0902 | 5.40 ppm |
2017-08-01 | 9590-007-0855 | 5.40 ppm |
2017-08-08 | 9590-007-0912 | 5.30 ppm |
2017-08-15 | 9590-007-0852 | 5.30 ppm |
2017-08-22 | 9590-007-1010 | 5.40 ppm |
2017-08-29 | 9590-007-1100 | 4.90 ppm |
2017-08-31 | 9590-007-1110 | 5.40 ppm |
2017-09-05 | 9590-007-1010 | 5.30 ppm |
2017-09-12 | 9590-007-0900 | 5.40 ppm |
2017-09-19 | 9590-007-0940 | 5.20 ppm |
2017-09-26 | 9590-007-0940 | 5.00 ppm |
2017-10-03 | 9590-007-1015 | 5.10 ppm |
2017-10-10 | 9590-007-0920 | 5.00 ppm |
2017-10-17 | 9590-007-0935 | 5.00 ppm |
2017-10-24 | 9590-007-0858 | 5.20 ppm |
2017-10-31 | 9590-007-1020 | 5.00 ppm |
2017-11-07 | 9590-007-0930 | 5.00 ppm |
2017-11-14 | 9590-007-1025 | 4.90 ppm |
2017-11-20 | 9590-007-1030 | 4.90 ppm |
2017-11-28 | 9590-007-0907 | 4.70 ppm |
2017-12-05 | 9590-007-0905 | 4.90 ppm |
2017-12-12 | 9590-007-0845 | 4.90 ppm |
2017-12-19 | 9590-007-1045 | 4.90 ppm |
2017-12-26 | 9590-007-1045 | 5.00 ppm |
2018-01-02 | 9590-007-1105 | 4.90 ppm |
2018-01-10 | 9590-007-0905 | 4.70 ppm |
2018-01-16 | 9590-007-0918 | 4.90 ppm |
2018-01-23 | 9590-007-0930 | 5.10 ppm |
2018-01-30 | 9590-007-0945 | 5.00 ppm |
2018-02-06 | 9590-007-1020 | 5.10 ppm |
2018-02-12 | 9590-007-1015 | 5.20 ppm |
2018-02-20 | 9590-007-0852 | 5.30 ppm |
2018-02-27 | 9590-007-0855 | 5.20 ppm |
2018-03-06 | 9590-007-0945 | 4.90 ppm |
2018-03-12 | 9590-007-1115 | 3.60 ppm |
2018-03-19 | 9590-007-1100 | 3.00 ppm |
2018-03-27 | 9590-007-1040 | 1.80 ppm |