Nitrate
Woodville Public Utility District
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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | 8.94 ppm | 57 | 57 | 5.70 ppm - 10.6 ppm |
| 2019 | 9.54 ppm | 42 | 42 | 6.00 ppm - 11.0 ppm |
| 2020 | 9.67 ppm | 19 | 19 | 8.80 ppm - 14.0 ppm |
| 2021 | 11.8 ppm | 36 | 36 | 8.20 ppm - 15.5 ppm |
| 2022 | 11.7 ppm | 31 | 31 | 8.00 ppm - 40.0 ppm |
| 2023 | 10.5 ppm | 40 | 40 | 8.00 ppm - 17.9 ppm |
ppm = parts per million
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 0.14 ppm
The EWG health guideline of 0.14 parts per million, or ppm, for nitrate and nitrite is based on the equivalent health guideline for nitrate, as defined in a peer-reviewed scientific study by EWG. This guideline represents a one-in-one-million annual cancer risk level.
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 |
|---|---|---|
| 2018-01-05 | CA5410025_002_002-201801050755 | 7.30 ppm |
| 2018-01-05 | CA5410025_004_004-201801050720 | 9.80 ppm |
| 2018-01-10 | CA5410025_004_004-201801100945 | 10.00 ppm |
| 2018-01-23 | CA5410025_004_004-201801231123 | 9.60 ppm |
| 2018-01-30 | CA5410025_004_004-201801301305 | 9.40 ppm |
| 2018-02-06 | CA5410025_004_004-201802061020 | 9.00 ppm |
| 2018-02-14 | CA5410025_004_004-201802140945 | 8.70 ppm |
| 2018-02-20 | CA5410025_004_004-201802201050 | 8.90 ppm |
| 2018-02-22 | CA5410025_002_002-201802221255 | 7.80 ppm |
| 2018-02-22 | CA5410025_004_004-201802221320 | 9.00 ppm |
| 2018-03-07 | CA5410025_004_004-201803071025 | 9.10 ppm |
| 2018-03-13 | CA5410025_004_004-201803131000 | 8.90 ppm |
| 2018-03-22 | CA5410025_004_004-201803221040 | 9.10 ppm |
| 2018-03-28 | CA5410025_004_004-201803281230 | 9.30 ppm |
| 2018-04-04 | CA5410025_004_004-201804040935 | 9.10 ppm |
| 2018-04-10 | CA5410025_004_004-201804101100 | 8.90 ppm |
| 2018-04-17 | CA5410025_004_004-201804171232 | 8.90 ppm |
| 2018-04-27 | CA5410025_004_004-201804271010 | 9.00 ppm |
| 2018-05-02 | CA5410025_004_004-201805021030 | 8.90 ppm |
| 2018-05-10 | CA5410025_004_004-201805100955 | 8.90 ppm |
| 2018-05-17 | CA5410025_002_002-201805171320 | 5.70 ppm |
| 2018-05-17 | CA5410025_004_004-201805170910 | 9.00 ppm |
| 2018-05-17 | CA5410025_004_004-201805171308 | 8.90 ppm |
| 2018-05-24 | CA5410025_004_004-201805240922 | 8.80 ppm |
| 2018-05-30 | CA5410025_004_004-201805300715 | 8.70 ppm |
| 2018-06-05 | CA5410025_004_004-201806051115 | 8.70 ppm |
| 2018-06-12 | CA5410025_004_004-201806121000 | 8.50 ppm |
| 2018-06-21 | CA5410025_004_004-201806211018 | 8.70 ppm |
| 2018-06-27 | CA5410025_004_004-201806271055 | 8.60 ppm |
| 2018-07-05 | CA5410025_004_004-201807050920 | 8.60 ppm |
| 2018-07-10 | CA5410025_004_004-201807101110 | 8.70 ppm |
| 2018-07-18 | CA5410025_004_004-201807180935 | 8.70 ppm |
| 2018-07-25 | CA5410025_004_004-201807250917 | 8.70 ppm |
| 2018-08-01 | CA5410025_004_004-201808010955 | 8.60 ppm |
| 2018-08-08 | CA5410025_004_004-201808081330 | 8.60 ppm |
| 2018-08-15 | CA5410025_004_004-201808150855 | 8.50 ppm |
| 2018-08-21 | CA5410025_004_004-201808211040 | 8.70 ppm |
| 2018-08-27 | CA5410025_002_002-201808271315 | 8.70 ppm |
| 2018-08-27 | CA5410025_004_004-201808271335 | 8.30 ppm |
| 2018-09-05 | CA5410025_004_004-201809050905 | 8.80 ppm |
| 2018-09-12 | CA5410025_004_004-201809120950 | 8.80 ppm |
| 2018-09-18 | CA5410025_004_004-201809181050 | 9.00 ppm |
| 2018-09-26 | CA5410025_004_004-201809261015 | 9.00 ppm |
| 2018-10-03 | CA5410025_004_004-201810030820 | 9.00 ppm |
| 2018-10-09 | CA5410025_004_004-201810091040 | 9.30 ppm |
| 2018-10-17 | CA5410025_004_004-201810171024 | 9.50 ppm |
| 2018-10-24 | CA5410025_004_004-201810241400 | 9.60 ppm |
| 2018-10-30 | CA5410025_004_004-201810300940 | 9.70 ppm |
| 2018-11-06 | CA5410025_004_004-201811061255 | 9.70 ppm |
| 2018-11-13 | CA5410025_004_004-201811131352 | 9.30 ppm |
| 2018-11-20 | CA5410025_004_004-201811201103 | 9.30 ppm |
| 2018-11-27 | CA5410025_004_004-201811271031 | 9.60 ppm |
| 2018-12-06 | CA5410025_004_004-201812060946 | 9.40 ppm |
| 2018-12-12 | CA5410025_004_004-201812120815 | 10.6 ppm |
| 2018-12-14 | CA5410025_004_004-201812140750 | 10.2 ppm |
| 2018-12-18 | CA5410025_002_002-201812181144 | 7.30 ppm |
| 2018-12-18 | CA5410025_004_004-201812181200 | 10.00 ppm |
| 2019-01-03 | CA5410025_004_004-201901031300 | 10.8 ppm |
| 2019-01-10 | CA5410025_004_004-201901101140 | 9.70 ppm |
| 2019-01-10 | CA5410025_004_004-201901100945 | 9.70 ppm |
| 2019-01-10 | CA5410025_004_004-201901101010 | 9.60 ppm |
| 2019-01-10 | CA5410025_004_004-201901100940 | 10.00 ppm |
| 2019-01-10 | CA5410025_004_004-201901100955 | 9.70 ppm |
| 2019-01-10 | CA5410025_004_004-201901101040 | 9.60 ppm |
| 2019-02-21 | CA5410025_002_002-201902211224 | 6.20 ppm |
| 2019-02-21 | CA5410025_002_002-201902211254 | 10.00 ppm |
| 2019-02-27 | CA5410025_004_004-201902271500 | 10.00 ppm |
| 2019-03-14 | CA5410025_004_004-201903140910 | 10.2 ppm |
| 2019-03-20 | CA5410025_004_004-201903201020 | 10.2 ppm |
| 2019-03-27 | CA5410025_004_004-201903271335 | 10.3 ppm |
| 2019-04-04 | CA5410025_004_004-201904040945 | 10.2 ppm |
| 2019-04-11 | CA5410025_004_004-201904111010 | 10.3 ppm |
| 2019-04-17 | CA5410025_004_004-201904171330 | 10.1 ppm |
| 2019-04-24 | CA5410025_004_004-201904240925 | 9.90 ppm |
| 2019-05-02 | CA5410025_004_004-201905021110 | 10.00 ppm |
| 2019-05-08 | CA5410025_004_004-201905081010 | 10.00 ppm |
| 2019-05-17 | CA5410025_004_004-201905170925 | 9.90 ppm |
| 2019-05-22 | CA5410025_004_004-201905221135 | 10.00 ppm |
| 2019-05-28 | CA5410025_002_002-201905281225 | 11.0 ppm |
| 2019-05-28 | CA5410025_004_004-201905281319 | 9.70 ppm |
| 2019-05-31 | CA5410025_002_002-201905310730 | 7.70 ppm |
| 2019-05-31 | CA5410025_002_002-201905310730 | 9.10 ppm |
| 2019-06-12 | CA5410025_004_004-201906121105 | 10.00 ppm |
| 2019-07-09 | CA5410025_004_004-201907091115 | 9.60 ppm |
| 2019-07-23 | CA5410025_004_004-201907231155 | 9.10 ppm |
| 2019-08-08 | CA5410025_004_004-201908080912 | 9.40 ppm |
| 2019-08-21 | CA5410025_004_004-201908211015 | 9.40 ppm |
| 2019-08-27 | CA5410025_004_004-201908271230 | 9.20 ppm |
| 2019-08-27 | CA5410025_002_002-201908271214 | 8.40 ppm |
| 2019-09-04 | CA5410025_004_004-201909040845 | 9.40 ppm |
| 2019-09-18 | CA5410025_004_004-201909181042 | 9.30 ppm |
| 2019-10-15 | CA5410025_004_004-201910151130 | 9.50 ppm |
| 2019-10-30 | CA5410025_004_004-201910301110 | 9.70 ppm |
| 2019-11-07 | CA5410025_004_004-201911071048 | 10.1 ppm |
| 2019-11-20 | CA5410025_004_004-201911201105 | 9.40 ppm |
| 2019-11-25 | CA5410025_004_004-201911251108 | 9.20 ppm |
| 2019-11-25 | CA5410025_002_002-201911251045 | 6.00 ppm |
| 2019-12-05 | CA5410025_004_004-201912050845 | 9.50 ppm |
| 2019-12-18 | CA5410025_004_004-201912181050 | 9.60 ppm |
| 2020-01-15 | CA5410025_004_004-202001151245 | 9.30 ppm |
| 2020-01-29 | CA5410025_004_004-202001291045 | 9.20 ppm |
| 2020-02-05 | CA5410025_004_004-202002051010 | 9.10 ppm |
| 2020-02-25 | CA5410025_004_004-202002251128 | 9.30 ppm |
| 2020-02-27 | CA5410025_004_004-202002271400 | 9.00 ppm |
| 2020-02-27 | CA5410025_002_002-202002271343 | 9.60 ppm |
| 2020-03-26 | CA5410025_004_004-202003260855 | 9.10 ppm |
| 2020-04-29 | CA5410025_004_004-202004291015 | 9.10 ppm |
| 2020-05-22 | CA5410025_002_002-202005221050 | 8.80 ppm |
| 2020-05-22 | CA5410025_004_004-202005221108 | 8.90 ppm |
| 2020-05-28 | CA5410025_004_004-202005281132 | 9.30 ppm |
| 2020-06-29 | CA5410025_004_004-202006290945 | 9.00 ppm |
| 2020-07-30 | CA5410025_004_004-202007301040 | 9.20 ppm |
| 2020-08-26 | CA5410025_004_004-202008260910 | 8.90 ppm |
| 2020-08-28 | CA5410025_002_002-202008280940 | 11.0 ppm |
| 2020-08-28 | CA5410025_004_004-202008280955 | 8.90 ppm |
| 2020-11-12 | CA5410025_002_002-202011121325 | 13.0 ppm |
| 2020-11-23 | CA5410025_004_004-202011231200 | 9.10 ppm |
| 2020-11-23 | CA5410025_002_002-202011231218 | 14.0 ppm |
| 2021-02-24 | CA5410025_002_002-202102241012 | 12.6 ppm |
| 2021-02-24 | CA5410025_002_002-202102241022 | 12.8 ppm |
| 2021-02-24 | CA5410025_002_002-202102241017 | 12.7 ppm |
| 2021-02-24 | CA5410025_002_002-202102241027 | 12.8 ppm |
| 2021-02-25 | CA5410025_004_004-202102251120 | 9.20 ppm |
| 2021-02-25 | CA5410025_002_002-202102251122 | 13.0 ppm |
| 2021-03-04 | CA5410025_002_002-202103041015 | 12.8 ppm |
| 2021-03-10 | CA5410025_002_002-202103101042 | 12.6 ppm |
| 2021-03-24 | CA5410025_002_002-202103240850 | 13.2 ppm |
| 2021-03-31 | CA5410025_002_002-202103310830 | 12.5 ppm |
| 2021-04-08 | CA5410025_002_002-202104080840 | 12.3 ppm |
| 2021-04-15 | CA5410025_002_002-202104150915 | 12.3 ppm |
| 2021-04-29 | CA5410025_002_002-202104291030 | 12.2 ppm |
| 2021-05-06 | CA5410025_002_002-202105061120 | 12.9 ppm |
| 2021-05-11 | CA5410025_004_004-202105110725 | 8.90 ppm |
| 2021-05-20 | CA5410025_004_004-202105201118 | 8.70 ppm |
| 2021-05-20 | CA5410025_002_002-202105201106 | 12.0 ppm |
| 2021-05-24 | CA5410025_002_002-202105240845 | 12.2 ppm |
| 2021-06-08 | CA5410025_002_002-202106080655 | 12.0 ppm |
| 2021-06-22 | CA5410025_002_002-202106221030 | 12.1 ppm |
| 2021-07-14 | CA5410025_002_002-202107140951 | 8.70 ppm |
| 2021-07-29 | CA5410025_002_002-202107291010 | 12.5 ppm |
| 2021-08-09 | CA5410025_002_002-202108090745 | 12.4 ppm |
| 2021-08-12 | CA5410025_002_002-202108120835 | 12.4 ppm |
| 2021-08-17 | CA5410025_002_002-202108171412 | 11.8 ppm |
| 2021-08-23 | CA5410025_004_004-202108231215 | 8.70 ppm |
| 2021-08-23 | CA5410025_002_002-202108231205 | 12.0 ppm |
| 2021-08-24 | CA5410025_004_004-202108241428 | 8.20 ppm |
| 2021-09-02 | CA5410025_002_002-202109021200 | 12.8 ppm |
| 2021-09-14 | CA5410025_002_002-202109140925 | 9.60 ppm |
| 2021-09-16 | CA5410025_002_002-202109161110 | 9.70 ppm |
| 2021-09-23 | CA5410025_002_002-202109231315 | 9.10 ppm |
| 2021-11-01 | CA5410025_002_002-202111011240 | 15.0 ppm |
| 2021-11-17 | CA5410025_002_002-202111170845 | 15.5 ppm |
| 2021-11-23 | CA5410025_002_002-202111231040 | 14.1 ppm |
| 2021-12-08 | CA5410025_002_002-202112080940 | 11.5 ppm |
| 2022-01-04 | CA5410025_004_004-202201040900 | 40.0 ppm |
| 2022-01-26 | CA5410025_002_002-202201260845 | 8.00 ppm |
| 2022-02-09 | CA5410025_002_002-202202090930 | 9.90 ppm |
| 2022-02-15 | CA5410025_002_002-202202151408 | 12.0 ppm |
| 2022-03-08 | CA5410025_004_004-202203080805 | 10.00 ppm |
| 2022-03-09 | CA5410025_004_004-202203090955 | 10.5 ppm |
| 2022-03-09 | CA5410025_002_002-202203090955 | 10.9 ppm |
| 2022-03-17 | CA5410025_002_002-202203170940 | 11.8 ppm |
| 2022-03-17 | CA5410025_004_004-202203171015 | 9.90 ppm |
| 2022-04-13 | CA5410025_004_004-202204130930 | 10.2 ppm |
| 2022-04-21 | CA5410025_004_004-202204211000 | 10.00 ppm |
| 2022-05-18 | CA5410025_004_004-202205180950 | 11.6 ppm |
| 2022-05-26 | CA5410025_004_004-202205260920 | 10.4 ppm |
| 2022-06-06 | CA5410025_004_004-202206061318 | 9.20 ppm |
| 2022-06-08 | CA5410025_004_004-202206081038 | 10.3 ppm |
| 2022-06-16 | CA5410025_004_004-202206161010 | 10.3 ppm |
| 2022-07-14 | CA5410025_004_004-202207140838 | 10.3 ppm |
| 2022-08-09 | CA5410025_004_004-202208091018 | 10.4 ppm |
| 2022-08-18 | CA5410025_004_004-202208180943 | 10.5 ppm |
| 2022-09-08 | CA5410025_004_004-202209081020 | 10.5 ppm |
| 2022-09-15 | CA5410025_004_004-202209151404 | 9.90 ppm |
| 2022-09-21 | CA5410025_004_004-202209210930 | 10.4 ppm |
| 2022-10-11 | CA5410025_004_004-202210111105 | 10.8 ppm |
| 2022-10-27 | CA5410025_004_004-202210271020 | 11.0 ppm |
| 2022-10-27 | CA5410025_002_002-202210271040 | 12.4 ppm |
| 2022-11-02 | CA5410025_004_004-202211021055 | 11.6 ppm |
| 2022-11-02 | CA5410025_002_002-202211021034 | 12.3 ppm |
| 2022-11-16 | CA5410025_004_004-202211161020 | 11.0 ppm |
| 2022-11-16 | CA5410025_002_002-202211161045 | 12.0 ppm |
| 2022-12-13 | CA5410025_004_004-202212131052 | 12.1 ppm |
| 2022-12-20 | CA5410025_004_004-202212201055 | 11.8 ppm |
| 2023-02-08 | CA5410025_004_004-202302081033 | 9.80 ppm |
| 2023-02-21 | CA5410025_002_002-202302211041 | 17.9 ppm |
| 2023-02-23 | CA5410025_002_002-202302231048 | 16.3 ppm |
| 2023-02-23 | CA5410025_004_004-202302231034 | 9.70 ppm |
| 2023-03-09 | CA5410025_002_002-202303091050 | 14.0 ppm |
| 2023-03-13 | CA5410025_002_002-202303131102 | 13.0 ppm |
| 2023-03-13 | CA5410025_004_004-202303131200 | 11.0 ppm |
| 2023-03-27 | CA5410025_002_002-202303271041 | 13.6 ppm |
| 2023-03-27 | CA5410025_004_004-202303270950 | 11.9 ppm |
| 2023-04-12 | CA5410025_002_002-202304121050 | 11.3 ppm |
| 2023-04-19 | CA5410025_002_002-202304191046 | 11.5 ppm |
| 2023-05-10 | CA5410025_002_002-202305100927 | 12.4 ppm |
| 2023-05-15 | CA5410025_002_002-202305151300 | 12.0 ppm |
| 2023-05-15 | CA5410025_004_004-202305151328 | 10.00 ppm |
| 2023-05-24 | CA5410025_004_004-202305241050 | 8.80 ppm |
| 2023-05-24 | CA5410025_002_002-202305241000 | 10.2 ppm |
| 2023-06-08 | CA5410025_004_004-202306081010 | 9.80 ppm |
| 2023-06-08 | CA5410025_002_002-202306080950 | 9.50 ppm |
| 2023-06-27 | CA5410025_002_002-202306270905 | 9.30 ppm |
| 2023-06-27 | CA5410025_004_004-202306270940 | 8.80 ppm |
| 2023-07-12 | CA5410025_004_004-202307120843 | 11.9 ppm |
| 2023-07-12 | CA5410025_002_002-202307120823 | 8.80 ppm |
| 2023-07-19 | CA5410025_002_002-202307191030 | 9.20 ppm |
| 2023-07-19 | CA5410025_004_004-202307191050 | 10.1 ppm |
| 2023-08-10 | CA5410025_002_002-202308101130 | 13.0 ppm |
| 2023-08-10 | CA5410025_004_004-202308101105 | 9.60 ppm |
| 2023-09-06 | CA5410025_004_004-202309061050 | 9.60 ppm |
| 2023-09-20 | CA5410025_002_002-202309200942 | 11.0 ppm |
| 2023-09-20 | CA5410025_004_004-202309201005 | 9.90 ppm |
| 2023-10-11 | CA5410025_004_004-202310110950 | 9.00 ppm |
| 2023-10-24 | CA5410025_004_004-202310241115 | 8.90 ppm |
| 2023-11-08 | CA5410025_004_004-202311080821 | 8.00 ppm |
| 2023-11-08 | CA5410025_002_002-202311080847 | 9.60 ppm |
| 2023-11-22 | CA5410025_002_002-202311220945 | 9.70 ppm |
| 2023-11-22 | CA5410025_004_004-202311220920 | 8.90 ppm |
| 2023-11-27 | CA5410025_004_004-202311271250 | 8.10 ppm |
| 2023-11-27 | CA5410025_002_002-202311271310 | 9.40 ppm |
| 2023-12-05 | CA5410025_004_004-202312050836 | 8.80 ppm |
| 2023-12-08 | CA5410025_002_002-202312080756 | 8.90 ppm |
| 2023-12-13 | CA5410025_002_002-202312130843 | 8.70 ppm |