Nitrate
City Of Modesto - Del Rio
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 | 3.51 ppm | 7 | 7 | 0.670 ppm - 8.28 ppm |
| 2019 | 4.03 ppm | 32 | 32 | 0.680 ppm - 8.80 ppm |
| 2020 | 5.50 ppm | 60 | 60 | 0.640 ppm - 8.70 ppm |
| 2021 | 3.50 ppm | 47 | 47 | 0.570 ppm - 5.30 ppm |
| 2022 | 3.21 ppm | 35 | 34 | ND - 5.50 ppm |
| 2023 | 3.71 ppm | 36 | 35 | ND - 7.00 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 |
|---|---|---|
| 2018-01-10 | CA5010029_002_002-201801100850 | 8.28 ppm |
| 2018-01-10 | CA5010029_004_004-201801100950 | 1.77 ppm |
| 2018-04-04 | CA5010029_002_002-201804040840 | 1.77 ppm |
| 2018-05-14 | CA5010029_010_010-201805140830 | 2.10 ppm |
| 2018-06-06 | CA5010029_001_001-201806060833 | 0.670 ppm |
| 2018-07-06 | CA5010029_002_002-201807060823 | 1.79 ppm |
| 2018-10-03 | CA5010029_002_002-201810030730 | 8.21 ppm |
| 2019-01-02 | CA5010029_004_004-201901020918 | 2.10 ppm |
| 2019-01-02 | CA5010029_002_002-201901020805 | 2.10 ppm |
| 2019-04-03 | CA5010029_002_002-201904030753 | 2.70 ppm |
| 2019-06-05 | CA5010029_001_001-201906050803 | 0.680 ppm |
| 2019-07-03 | CA5010029_002_002-201907030825 | 2.40 ppm |
| 2019-10-02 | CA5010029_002_002-201910020840 | 2.10 ppm |
| 2019-10-16 | CA5010029_002_002-201910160828 | 8.40 ppm |
| 2019-10-17 | CA5010029_002_002-201910170958 | 2.30 ppm |
| 2019-10-18 | CA5010029_002_002-201910180843 | 2.30 ppm |
| 2019-10-21 | CA5010029_002_002-201910210812 | 2.50 ppm |
| 2019-10-22 | CA5010029_002_002-201910220800 | 7.00 ppm |
| 2019-10-23 | CA5010029_002_002-201910230745 | 7.20 ppm |
| 2019-10-24 | CA5010029_002_002-201910240755 | 2.10 ppm |
| 2019-10-25 | CA5010029_002_002-201910250915 | 2.70 ppm |
| 2019-10-29 | CA5010029_002_002-201910290815 | 7.00 ppm |
| 2019-10-30 | CA5010029_002_002-201910300803 | 7.50 ppm |
| 2019-10-31 | CA5010029_002_002-201910311217 | 4.70 ppm |
| 2019-11-01 | CA5010029_002_002-201911010845 | 2.70 ppm |
| 2019-11-04 | CA5010029_002_002-201911040835 | 2.70 ppm |
| 2019-11-05 | CA5010029_002_002-201911050807 | 8.80 ppm |
| 2019-11-06 | CA5010029_002_002-201911060900 | 6.80 ppm |
| 2019-11-07 | CA5010029_002_002-201911071105 | 3.40 ppm |
| 2019-11-08 | CA5010029_002_002-201911080815 | 2.50 ppm |
| 2019-11-12 | CA5010029_002_002-201911120908 | 6.80 ppm |
| 2019-11-13 | CA5010029_002_002-201911130820 | 8.60 ppm |
| 2019-11-14 | CA5010029_002_002-201911140810 | 3.40 ppm |
| 2019-11-15 | CA5010029_002_002-201911150910 | 2.30 ppm |
| 2019-11-26 | CA5010029_002_002-201911261145 | 2.50 ppm |
| 2019-11-27 | CA5010029_002_002-201911270840 | 2.30 ppm |
| 2019-12-02 | CA5010029_002_002-201912020840 | 2.30 ppm |
| 2019-12-03 | CA5010029_002_002-201912030810 | 2.00 ppm |
| 2019-12-04 | CA5010029_002_002-201912041240 | 6.10 ppm |
| 2020-01-08 | CA5010029_002_002-202001080930 | 2.10 ppm |
| 2020-01-08 | CA5010029_004_004-202001081015 | 2.10 ppm |
| 2020-01-28 | CA5010029_002_002-202001281150 | 2.50 ppm |
| 2020-01-29 | CA5010029_002_002-202001290930 | 2.70 ppm |
| 2020-01-30 | CA5010029_002_002-202001300950 | 3.40 ppm |
| 2020-01-31 | CA5010029_002_002-202001310815 | 3.80 ppm |
| 2020-02-03 | CA5010029_002_002-202002030842 | 5.40 ppm |
| 2020-02-05 | CA5010029_002_002-202002050910 | 6.30 ppm |
| 2020-02-12 | CA5010029_002_002-202002120820 | 6.60 ppm |
| 2020-02-19 | CA5010029_002_002-202002190915 | 7.50 ppm |
| 2020-02-26 | CA5010029_002_002-202002260900 | 8.70 ppm |
| 2020-03-04 | CA5010029_002_002-202003041220 | 7.50 ppm |
| 2020-03-11 | CA5010029_002_002-202003110916 | 7.10 ppm |
| 2020-03-26 | CA5010029_002_002-202003260903 | 6.80 ppm |
| 2020-04-01 | CA5010029_002_002-202004010930 | 7.10 ppm |
| 2020-04-08 | CA5010029_002_002-202004080949 | 6.90 ppm |
| 2020-04-15 | CA5010029_002_002-202004150855 | 7.10 ppm |
| 2020-04-22 | CA5010029_002_002-202004220925 | 7.10 ppm |
| 2020-04-29 | CA5010029_002_002-202004291010 | 6.90 ppm |
| 2020-05-06 | CA5010029_002_002-202005061055 | 7.40 ppm |
| 2020-05-13 | CA5010029_002_002-202005130840 | 7.10 ppm |
| 2020-05-13 | CA5010029_010_010-202005131047 | 3.80 ppm |
| 2020-05-20 | CA5010029_002_002-202005200900 | 7.00 ppm |
| 2020-05-27 | CA5010029_002_002-202005270945 | 7.50 ppm |
| 2020-06-03 | CA5010029_001_001-202006031043 | 0.640 ppm |
| 2020-06-03 | CA5010029_002_002-202006031113 | 1.90 ppm |
| 2020-06-10 | CA5010029_002_002-202006101010 | 7.40 ppm |
| 2020-06-17 | CA5010029_002_002-202006171034 | 8.30 ppm |
| 2020-06-24 | CA5010029_002_002-202006240959 | 6.60 ppm |
| 2020-07-01 | CA5010029_002_002-202007011220 | 7.00 ppm |
| 2020-07-08 | CA5010029_002_002-202007081025 | 8.00 ppm |
| 2020-07-15 | CA5010029_002_002-202007151033 | 6.70 ppm |
| 2020-07-22 | CA5010029_002_002-202007221105 | 2.10 ppm |
| 2020-07-29 | CA5010029_002_002-202007291107 | 6.50 ppm |
| 2020-08-05 | CA5010029_002_002-202008051207 | 6.20 ppm |
| 2020-08-12 | CA5010029_002_002-202008121115 | 8.40 ppm |
| 2020-08-19 | CA5010029_002_002-202008191118 | 8.20 ppm |
| 2020-08-25 | CA5010029_002_002-202008251053 | 6.60 ppm |
| 2020-09-02 | CA5010029_002_002-202009021136 | 7.30 ppm |
| 2020-09-08 | CA5010029_002_002-202009081007 | 7.80 ppm |
| 2020-09-16 | CA5010029_002_002-202009161002 | 8.10 ppm |
| 2020-09-23 | CA5010029_002_002-202009230858 | 7.10 ppm |
| 2020-09-30 | CA5010029_002_002-202009301104 | 3.20 ppm |
| 2020-10-07 | CA5010029_002_002-202010070929 | 8.00 ppm |
| 2020-10-14 | CA5010029_002_002-202010140917 | 2.50 ppm |
| 2020-10-21 | CA5010029_002_002-202010210845 | 7.10 ppm |
| 2020-10-28 | CA5010029_002_002-202010280840 | 3.80 ppm |
| 2020-11-04 | CA5010029_002_002-202011041040 | 3.80 ppm |
| 2020-11-04 | CA5010029_011_011-202011040910 | 3.80 ppm |
| 2020-11-04 | CA5010029_010_010-202011040938 | 3.80 ppm |
| 2020-11-10 | CA5010029_002_002-202011100940 | 3.80 ppm |
| 2020-11-18 | CA5010029_002_002-202011181010 | 4.00 ppm |
| 2020-11-23 | CA5010029_002_002-202011230900 | 4.00 ppm |
| 2020-12-02 | CA5010029_011_011-202012021015 | 3.90 ppm |
| 2020-12-02 | CA5010029_002_002-202012021100 | 3.90 ppm |
| 2020-12-02 | CA5010029_010_010-202012020948 | 3.50 ppm |
| 2020-12-09 | CA5010029_002_002-202012090910 | 3.90 ppm |
| 2020-12-16 | CA5010029_002_002-202012160900 | 3.80 ppm |
| 2020-12-21 | CA5010029_002_002-202012210935 | 3.90 ppm |
| 2020-12-28 | CA5010029_002_002-202012280930 | 3.90 ppm |
| 2021-01-06 | CA5010029_002_002-202101061007 | 3.90 ppm |
| 2021-01-06 | CA5010029_004_004-202101061035 | 3.90 ppm |
| 2021-01-06 | CA5010029_010_010-202101060807 | 3.90 ppm |
| 2021-01-06 | CA5010029_011_011-202101060905 | 3.80 ppm |
| 2021-01-13 | CA5010029_002_002-202101130915 | 3.80 ppm |
| 2021-01-20 | CA5010029_002_002-202101200940 | 3.80 ppm |
| 2021-01-27 | CA5010029_002_002-202101270906 | 3.80 ppm |
| 2021-02-03 | CA5010029_011_011-202102030900 | 3.80 ppm |
| 2021-02-03 | CA5010029_002_002-202102030950 | 4.00 ppm |
| 2021-02-03 | CA5010029_010_010-202102030815 | 3.70 ppm |
| 2021-02-10 | CA5010029_002_002-202102100805 | 3.90 ppm |
| 2021-02-16 | CA5010029_002_002-202102160835 | 3.90 ppm |
| 2021-02-24 | CA5010029_002_002-202102240900 | 3.80 ppm |
| 2021-03-03 | CA5010029_002_002-202103030835 | 3.80 ppm |
| 2021-03-03 | CA5010029_010_010-202103030835 | 3.80 ppm |
| 2021-03-03 | CA5010029_002_002-202103031240 | 3.80 ppm |
| 2021-03-03 | CA5010029_011_011-202103030920 | 3.70 ppm |
| 2021-03-10 | CA5010029_002_002-202103100815 | 3.80 ppm |
| 2021-03-17 | CA5010029_002_002-202103170825 | 3.80 ppm |
| 2021-04-07 | CA5010029_010_010-202104070805 | 3.60 ppm |
| 2021-04-07 | CA5010029_002_002-202104070950 | 3.70 ppm |
| 2021-04-07 | CA5010029_011_011-202104070900 | 3.60 ppm |
| 2021-05-04 | CA5010029_010_010-202105040905 | 3.90 ppm |
| 2021-05-04 | CA5010029_011_011-202105040840 | 3.50 ppm |
| 2021-05-05 | CA5010029_002_002-202105050945 | 3.50 ppm |
| 2021-06-01 | CA5010029_011_011-202106010910 | 3.30 ppm |
| 2021-06-01 | CA5010029_001_001-202106010945 | 0.570 ppm |
| 2021-06-01 | CA5010029_010_010-202106010800 | 3.30 ppm |
| 2021-06-01 | CA5010029_002_002-202106010930 | 3.10 ppm |
| 2021-07-06 | CA5010029_011_011-202107061245 | 3.20 ppm |
| 2021-07-06 | CA5010029_002_002-202107061310 | 3.20 ppm |
| 2021-07-06 | CA5010029_010_010-202107061030 | 3.10 ppm |
| 2021-08-04 | CA5010029_002_002-202108041215 | 3.00 ppm |
| 2021-08-04 | CA5010029_010_010-202108040805 | 2.90 ppm |
| 2021-08-04 | CA5010029_011_011-202108040850 | 3.00 ppm |
| 2021-09-01 | CA5010029_002_002-202109010930 | 5.30 ppm |
| 2021-09-01 | CA5010029_010_010-202109010820 | 2.90 ppm |
| 2021-09-01 | CA5010029_011_011-202109010850 | 3.00 ppm |
| 2021-10-20 | CA5010029_010_010-202110200820 | 3.70 ppm |
| 2021-10-20 | CA5010029_011_011-202110200805 | 3.10 ppm |
| 2021-10-20 | CA5010029_002_002-202110200750 | 2.90 ppm |
| 2021-11-03 | CA5010029_002_002-202111030820 | 3.30 ppm |
| 2021-11-03 | CA5010029_010_010-202111030925 | 3.90 ppm |
| 2021-11-03 | CA5010029_011_011-202111030900 | 3.20 ppm |
| 2021-12-01 | CA5010029_011_011-202112010855 | 3.10 ppm |
| 2021-12-01 | CA5010029_002_002-202112010815 | 3.20 ppm |
| 2021-12-01 | CA5010029_010_010-202112010915 | 3.80 ppm |
| 2022-01-05 | CA5010029_010_010-202201050809 | 3.90 ppm |
| 2022-01-05 | CA5010029_002_002-202201050908 | 3.70 ppm |
| 2022-01-05 | CA5010029_011_011-202201050826 | 3.70 ppm |
| 2022-01-05 | CA5010029_004_004-202201050846 | 3.60 ppm |
| 2022-02-02 | CA5010029_002_002-202202020830 | 3.30 ppm |
| 2022-02-02 | CA5010029_010_010-202202020910 | 4.40 ppm |
| 2022-02-02 | CA5010029_011_011-202202020950 | 3.20 ppm |
| 2022-03-02 | CA5010029_011_011-202203020835 | 3.20 ppm |
| 2022-03-02 | CA5010029_002_002-202203020750 | 3.20 ppm |
| 2022-03-02 | CA5010029_010_010-202203020850 | 3.20 ppm |
| 2022-04-06 | CA5010029_010_010-202204060955 | 3.20 ppm |
| 2022-04-06 | CA5010029_002_002-202204061255 | 3.10 ppm |
| 2022-04-06 | CA5010029_011_011-202204061030 | 3.10 ppm |
| 2022-05-04 | CA5010029_011_011-202205040850 | 2.80 ppm |
| 2022-05-04 | CA5010029_002_002-202205040700 | 3.60 ppm |
| 2022-05-04 | CA5010029_010_010-202205040800 | 2.60 ppm |
| 2022-06-01 | CA5010029_001_001-202206010755 | ND |
| 2022-06-01 | CA5010029_002_002-202206010725 | 5.50 ppm |
| 2022-06-01 | CA5010029_011_011-202206010915 | 2.90 ppm |
| 2022-06-01 | CA5010029_010_010-202206010830 | 2.80 ppm |
| 2022-07-05 | CA5010029_011_011-202207051310 | 2.90 ppm |
| 2022-07-05 | CA5010029_010_010-202207051230 | 3.60 ppm |
| 2022-07-05 | CA5010029_002_002-202207050945 | 3.10 ppm |
| 2022-08-03 | CA5010029_011_011-202208031105 | 2.70 ppm |
| 2022-08-03 | CA5010029_010_010-202208031025 | 2.60 ppm |
| 2022-08-17 | CA5010029_002_002-202208170840 | 2.80 ppm |
| 2022-09-06 | CA5010029_002_002-202209061240 | 4.10 ppm |
| 2022-09-06 | CA5010029_010_010-202209060950 | 2.70 ppm |
| 2022-09-06 | CA5010029_011_011-202209061030 | 2.80 ppm |
| 2022-10-05 | CA5010029_002_002-202210050815 | 3.20 ppm |
| 2022-10-05 | CA5010029_010_010-202210050900 | 2.70 ppm |
| 2022-10-05 | CA5010029_011_011-202210050930 | 2.90 ppm |
| 2022-12-07 | CA5010029_002_002-202212070805 | 3.50 ppm |
| 2022-12-07 | CA5010029_010_010-202212070850 | 4.30 ppm |
| 2022-12-07 | CA5010029_011_011-202212070930 | 3.40 ppm |
| 2023-01-03 | CA5010029_002_002-202301031225 | 3.60 ppm |
| 2023-01-03 | CA5010029_011_011-202301031310 | 3.60 ppm |
| 2023-01-03 | CA5010029_010_010-202301031235 | 3.90 ppm |
| 2023-02-01 | CA5010029_010_010-202302010955 | 4.50 ppm |
| 2023-02-01 | CA5010029_011_011-202302011030 | 3.60 ppm |
| 2023-02-01 | CA5010029_002_002-202302010900 | 3.60 ppm |
| 2023-03-01 | CA5010029_002_002-202303010810 | 3.50 ppm |
| 2023-03-01 | CA5010029_010_010-202303011200 | 3.00 ppm |
| 2023-03-01 | CA5010029_011_011-202303011240 | 3.40 ppm |
| 2023-04-05 | CA5010029_011_011-202304051010 | 3.60 ppm |
| 2023-04-05 | CA5010029_002_002-202304050835 | 4.00 ppm |
| 2023-05-03 | CA5010029_010_010-202305030910 | 3.00 ppm |
| 2023-05-03 | CA5010029_011_011-202305031010 | 3.20 ppm |
| 2023-05-03 | CA5010029_002_002-202305030750 | 3.20 ppm |
| 2023-06-07 | CA5010029_011_011-202306070950 | 3.30 ppm |
| 2023-06-07 | CA5010029_010_010-202306070910 | 3.10 ppm |
| 2023-06-07 | CA5010029_001_001-202306070840 | ND |
| 2023-06-07 | CA5010029_002_002-202306070825 | 5.30 ppm |
| 2023-07-05 | CA5010029_010_010-202307050925 | 3.00 ppm |
| 2023-07-05 | CA5010029_011_011-202307051005 | 3.20 ppm |
| 2023-07-05 | CA5010029_002_002-202307050755 | 5.90 ppm |
| 2023-08-02 | CA5010029_002_002-202308020815 | 6.60 ppm |
| 2023-08-02 | CA5010029_010_010-202308020925 | 3.10 ppm |
| 2023-08-02 | CA5010029_011_011-202308021040 | 3.20 ppm |
| 2023-09-05 | CA5010029_002_002-202309050835 | 7.00 ppm |
| 2023-09-05 | CA5010029_010_010-202309050925 | 3.20 ppm |
| 2023-09-05 | CA5010029_011_011-202309051000 | 3.50 ppm |
| 2023-10-04 | CA5010029_010_010-202310040910 | 3.20 ppm |
| 2023-10-04 | CA5010029_011_011-202310040945 | 3.40 ppm |
| 2023-10-04 | CA5010029_002_002-202310040820 | 3.80 ppm |
| 2023-11-01 | CA5010029_002_002-202311010830 | 3.50 ppm |
| 2023-11-01 | CA5010029_011_011-202311011010 | 3.50 ppm |
| 2023-11-01 | CA5010029_010_010-202311010930 | 3.30 ppm |
| 2023-12-06 | CA5010029_002_002-202312060810 | 3.80 ppm |
| 2023-12-06 | CA5010029_010_010-202312060900 | 5.20 ppm |
| 2023-12-06 | CA5010029_011_011-202312060945 | 3.70 ppm |