Nitrate
Foothill Apartments
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 | 9.70 ppm | 11 | 11 | 4.30 ppm - 24.2 ppm |
| 2019 | 7.94 ppm | 17 | 17 | 4.00 ppm - 15.8 ppm |
| 2020 | 9.30 ppm | 18 | 18 | 2.50 ppm - 18.8 ppm |
| 2021 | 8.99 ppm | 16 | 16 | 2.70 ppm - 18.9 ppm |
| 2022 | 5.27 ppm | 65 | 64 | ND - 16.0 ppm |
| 2023 | 5.25 ppm | 64 | 53 | ND - 16.1 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 |
|---|---|---|
| 2018-01-02 | CA5400769_001_001-201801021000 | 24.2 ppm |
| 2018-01-02 | CA5400769_002_002-201801021000 | 5.40 ppm |
| 2018-04-03 | CA5400769_001_001-201804030835 | 15.5 ppm |
| 2018-04-03 | CA5400769_002_002-201804030835 | 4.30 ppm |
| 2018-07-02 | CA5400769_001_001-201807020715 | 15.1 ppm |
| 2018-07-02 | CA5400769_002_002-201807020715 | 6.10 ppm |
| 2018-08-20 | CA5400769_001_001-201808200745 | 5.80 ppm |
| 2018-10-01 | CA5400769_001_001-201810010745 | 15.6 ppm |
| 2018-10-01 | CA5400769_002_002-201810010745 | 5.10 ppm |
| 2018-11-26 | CA5400769_002_002-201811260931 | 4.90 ppm |
| 2018-12-03 | CA5400769_002_002-201812030850 | 4.70 ppm |
| 2019-01-07 | CA5400769_001_001-201901070800 | 15.8 ppm |
| 2019-01-07 | CA5400769_002_002-201901070800 | 5.50 ppm |
| 2019-02-04 | CA5400769_002_002-201902040830 | 4.80 ppm |
| 2019-03-07 | CA5400769_002_002-201903070700 | 5.00 ppm |
| 2019-04-01 | CA5400769_001_001-201904010820 | 15.5 ppm |
| 2019-04-01 | CA5400769_002_002-201904010820 | 5.00 ppm |
| 2019-05-02 | CA5400769_002_002-201905020725 | 4.00 ppm |
| 2019-06-03 | CA5400769_002_002-201906030850 | 6.20 ppm |
| 2019-07-08 | CA5400769_001_001-201907080700 | 15.4 ppm |
| 2019-07-08 | CA5400769_002_002-201907080700 | 5.50 ppm |
| 2019-08-05 | CA5400769_002_002-201908050720 | 4.90 ppm |
| 2019-09-03 | CA5400769_002_002-201909030845 | 5.20 ppm |
| 2019-10-03 | CA5400769_001_001-201910030735 | 15.5 ppm |
| 2019-10-03 | CA5400769_002_002-201910030735 | 4.30 ppm |
| 2019-11-04 | CA5400769_002_002-201911040630 | 11.3 ppm |
| 2019-11-13 | CA5400769_002_002-201911130715 | 5.50 ppm |
| 2019-12-04 | CA5400769_002_002-201912040800 | 5.60 ppm |
| 2020-01-06 | CA5400769_001_001-202001060750 | 15.2 ppm |
| 2020-01-06 | CA5400769_002_002-202001060750 | 6.80 ppm |
| 2020-02-03 | CA5400769_002_002-202002030710 | 8.50 ppm |
| 2020-03-05 | CA5400769_002_002-202003050730 | 5.70 ppm |
| 2020-04-01 | CA5400769_001_001-202004010720 | 15.3 ppm |
| 2020-04-07 | CA5400769_002_002-202004070740 | 2.50 ppm |
| 2020-05-04 | CA5400769_002_002-202005040820 | 5.70 ppm |
| 2020-06-01 | CA5400769_002_002-202006010640 | 5.60 ppm |
| 2020-07-01 | CA5400769_001_001-202007010700 | 18.8 ppm |
| 2020-07-01 | CA5400769_002_002-202007010700 | 6.10 ppm |
| 2020-08-03 | CA5400769_002_002-202008030730 | 5.50 ppm |
| 2020-09-01 | CA5400769_002_002-202009010730 | 5.70 ppm |
| 2020-10-05 | CA5400769_001_001-202010050715 | 16.6 ppm |
| 2020-10-05 | CA5400769_002_002-202010050715 | 5.90 ppm |
| 2020-11-12 | CA5400769_001_001-202011120700 | 18.0 ppm |
| 2020-11-12 | CA5400769_002_002-202011120700 | 5.30 ppm |
| 2020-12-14 | CA5400769_002_002-202012140715 | 15.2 ppm |
| 2020-12-21 | CA5400769_002_002-202012210930 | 5.00 ppm |
| 2021-01-12 | CA5400769_002_002-202101120800 | 5.10 ppm |
| 2021-01-12 | CA5400769_001_001-202101120800 | 17.2 ppm |
| 2021-02-01 | CA5400769_002_002-202102010740 | 5.50 ppm |
| 2021-03-01 | CA5400769_002_002-202103010700 | 17.3 ppm |
| 2021-03-04 | CA5400769_002_002-202103040710 | 5.10 ppm |
| 2021-04-05 | CA5400769_002_002-202104050735 | 6.60 ppm |
| 2021-04-05 | CA5400769_001_001-202104050735 | 17.3 ppm |
| 2021-05-10 | CA5400769_002_002-202105100800 | 5.60 ppm |
| 2021-06-01 | CA5400769_002_002-202106010630 | 3.40 ppm |
| 2021-07-01 | CA5400769_001_001-202107010720 | 18.9 ppm |
| 2021-07-01 | CA5400769_002_002-202107010720 | 8.60 ppm |
| 2021-08-02 | CA5400769_002_002-202108020655 | 5.70 ppm |
| 2021-09-01 | CA5400769_002_002-202109010630 | 4.70 ppm |
| 2021-10-04 | CA5400769_001_001-202110040745 | 15.2 ppm |
| 2021-10-04 | CA5400769_002_002-202110040745 | 2.70 ppm |
| 2021-12-01 | CA5400769_002_002-202112010815 | 5.00 ppm |
| 2022-01-05 | CA5400769_001_001-202201051040 | 14.9 ppm |
| 2022-01-05 | CA5400769_002_002-202201051040 | 2.30 ppm |
| 2022-01-11 | CA5400769_002_002-202201110720 | 2.70 ppm |
| 2022-01-18 | CA5400769_002_002-202201180800 | 5.00 ppm |
| 2022-01-26 | CA5400769_002_002-202201260710 | 2.40 ppm |
| 2022-02-01 | CA5400769_001_001-202202011005 | 14.9 ppm |
| 2022-02-01 | CA5400769_002_002-202202011005 | 2.20 ppm |
| 2022-02-09 | CA5400769_002_002-202202091140 | 2.50 ppm |
| 2022-02-15 | CA5400769_002_002-202202151140 | 2.10 ppm |
| 2022-02-22 | CA5400769_002_002-202202221600 | 3.10 ppm |
| 2022-03-02 | CA5400769_002_002-202203022020 | 5.20 ppm |
| 2022-03-02 | CA5400769_001_001-202203022015 | 14.5 ppm |
| 2022-03-07 | CA5400769_002_002-202203072000 | 3.50 ppm |
| 2022-03-16 | CA5400769_002_002-202203162000 | 2.10 ppm |
| 2022-03-22 | CA5400769_002_002-202203221930 | 3.30 ppm |
| 2022-03-29 | CA5400769_002_002-202203291830 | 1.90 ppm |
| 2022-04-04 | CA5400769_001_001-202204041935 | 15.6 ppm |
| 2022-04-04 | CA5400769_002_002-202204041945 | 3.50 ppm |
| 2022-04-11 | CA5400769_002_002-202204112000 | 3.40 ppm |
| 2022-04-19 | CA5400769_002_002-202204191145 | 5.20 ppm |
| 2022-04-27 | CA5400769_002_002-202204271730 | ND |
| 2022-05-03 | CA5400769_002_002-202205031200 | 2.50 ppm |
| 2022-05-09 | CA5400769_002_002-202205092000 | 2.30 ppm |
| 2022-05-18 | CA5400769_002_002-202205182000 | 2.00 ppm |
| 2022-05-24 | CA5400769_001_001-202205240720 | 15.4 ppm |
| 2022-05-24 | CA5400769_002_002-202205240715 | 2.60 ppm |
| 2022-05-31 | CA5400769_002_002-202205312015 | 2.00 ppm |
| 2022-06-06 | CA5400769_002_002-202206060645 | 3.00 ppm |
| 2022-06-14 | CA5400769_002_002-202206142015 | 2.00 ppm |
| 2022-06-22 | CA5400769_002_002-202206222000 | 1.80 ppm |
| 2022-06-28 | CA5400769_002_002-202206282000 | 2.60 ppm |
| 2022-07-07 | CA5400769_002_002-202207070745 | 2.50 ppm |
| 2022-07-14 | CA5400769_002_002-202207140730 | 3.80 ppm |
| 2022-07-18 | CA5400769_001_001-202207182020 | 15.6 ppm |
| 2022-07-18 | CA5400769_002_002-202207182030 | 3.00 ppm |
| 2022-07-28 | CA5400769_002_002-202207282000 | 1.10 ppm |
| 2022-08-04 | CA5400769_002_002-202208040800 | 3.40 ppm |
| 2022-08-10 | CA5400769_002_002-202208101900 | 1.70 ppm |
| 2022-08-17 | CA5400769_002_002-202208171940 | 3.00 ppm |
| 2022-08-17 | CA5400769_001_001-202208171930 | 16.0 ppm |
| 2022-08-22 | CA5400769_002_002-202208221800 | 3.00 ppm |
| 2022-08-28 | CA5400769_001_001-202208280915 | 15.1 ppm |
| 2022-08-30 | CA5400769_002_002-202208302030 | 2.00 ppm |
| 2022-09-05 | CA5400769_002_002-202209051900 | 2.20 ppm |
| 2022-09-14 | CA5400769_002_002-202209142000 | 2.90 ppm |
| 2022-09-23 | CA5400769_002_002-202209230730 | 4.80 ppm |
| 2022-09-26 | CA5400769_002_002-202209261900 | 2.30 ppm |
| 2022-09-26 | CA5400769_001_001-202209261910 | 7.70 ppm |
| 2022-10-06 | CA5400769_002_002-202210062000 | 5.40 ppm |
| 2022-10-10 | CA5400769_002_002-202210100715 | 5.00 ppm |
| 2022-10-11 | CA5400769_001_001-202210112030 | 14.7 ppm |
| 2022-10-20 | CA5400769_002_002-202210202000 | 2.00 ppm |
| 2022-10-20 | CA5400769_001_001-202210202010 | 15.6 ppm |
| 2022-10-26 | CA5400769_002_002-202210261200 | 3.60 ppm |
| 2022-11-03 | CA5400769_001_001-202211031940 | 15.9 ppm |
| 2022-11-03 | CA5400769_002_002-202211031930 | 3.10 ppm |
| 2022-11-07 | CA5400769_002_002-202211072000 | 1.90 ppm |
| 2022-11-17 | CA5400769_002_002-202211172000 | 4.80 ppm |
| 2022-11-21 | CA5400769_002_002-202211212000 | 4.30 ppm |
| 2022-11-27 | CA5400769_002_002-202211271430 | 2.80 ppm |
| 2022-12-05 | CA5400769_002_002-202212052030 | 2.50 ppm |
| 2022-12-08 | CA5400769_001_001-202212081415 | 15.7 ppm |
| 2022-12-13 | CA5400769_002_002-202212131800 | 1.90 ppm |
| 2022-12-19 | CA5400769_002_002-202212192000 | 2.10 ppm |
| 2022-12-28 | CA5400769_002_002-202212281630 | 4.50 ppm |
| 2023-01-04 | CA5400769_001_001-202301042010 | 16.1 ppm |
| 2023-01-04 | CA5400769_002_002-202301042000 | 5.70 ppm |
| 2023-01-11 | CA5400769_002_002-202301111550 | 4.90 ppm |
| 2023-01-19 | CA5400769_002_002-202301191630 | 2.60 ppm |
| 2023-01-25 | CA5400769_002_002-202301252100 | 1.50 ppm |
| 2023-01-30 | CA5400769_002_002-202301301445 | 2.40 ppm |
| 2023-02-08 | CA5400769_002_002-202302081440 | 4.30 ppm |
| 2023-02-08 | CA5400769_001_001-202302081445 | 15.8 ppm |
| 2023-02-16 | CA5400769_002_002-202302161100 | ND |
| 2023-02-22 | CA5400769_002_002-202302221030 | ND |
| 2023-03-01 | CA5400769_002_002-202303011210 | 5.60 ppm |
| 2023-03-08 | CA5400769_002_002-202303081020 | 10.8 ppm |
| 2023-03-12 | CA5400769_002_002-202303122000 | 3.90 ppm |
| 2023-03-16 | CA5400769_002_002-202303160930 | 2.00 ppm |
| 2023-03-23 | CA5400769_002_002-202303230930 | 14.7 ppm |
| 2023-03-24 | CA5400769_002_002-202303241130 | 15.2 ppm |
| 2023-03-27 | CA5400769_002_002-202303271745 | 2.50 ppm |
| 2023-03-27 | CA5400769_001_001-202303271800 | 15.7 ppm |
| 2023-04-02 | CA5400769_002_002-202304021930 | 3.00 ppm |
| 2023-04-13 | CA5400769_002_002-202304131900 | 3.20 ppm |
| 2023-04-13 | CA5400769_001_001-202304131910 | 15.8 ppm |
| 2023-04-19 | CA5400769_002_002-202304191630 | ND |
| 2023-04-27 | CA5400769_002_002-202304271845 | 2.90 ppm |
| 2023-05-03 | CA5400769_001_001-202305031930 | 15.7 ppm |
| 2023-05-03 | CA5400769_002_002-202305031935 | 2.00 ppm |
| 2023-05-10 | CA5400769_002_002-202305101700 | 2.90 ppm |
| 2023-05-24 | CA5400769_002_002-202305241930 | 2.80 ppm |
| 2023-05-31 | CA5400769_002_002-202305311930 | 3.10 ppm |
| 2023-06-09 | CA5400769_002_002-202306090940 | 2.40 ppm |
| 2023-06-09 | CA5400769_001_001-202306090930 | 13.9 ppm |
| 2023-06-14 | CA5400769_002_002-202306141600 | 2.10 ppm |
| 2023-06-22 | CA5400769_002_002-202306221700 | 2.90 ppm |
| 2023-06-26 | CA5400769_002_002-202306261930 | 2.70 ppm |
| 2023-07-05 | CA5400769_002_002-202307051700 | ND |
| 2023-07-10 | CA5400769_001_001-202307101700 | 15.2 ppm |
| 2023-07-10 | CA5400769_002_002-202307101710 | ND |
| 2023-07-19 | CA5400769_002_002-202307191700 | 3.50 ppm |
| 2023-07-24 | CA5400769_002_002-202307241815 | ND |
| 2023-08-01 | CA5400769_002_002-202308010730 | ND |
| 2023-08-07 | CA5400769_002_002-202308071235 | 2.10 ppm |
| 2023-08-07 | CA5400769_001_001-202308071240 | 15.4 ppm |
| 2023-08-15 | CA5400769_002_002-202308151600 | 2.60 ppm |
| 2023-08-22 | CA5400769_002_002-202308221715 | ND |
| 2023-08-29 | CA5400769_002_002-202308291800 | 3.70 ppm |
| 2023-09-05 | CA5400769_002_002-202309051930 | 4.40 ppm |
| 2023-09-10 | CA5400769_001_001-202309101800 | 14.6 ppm |
| 2023-09-10 | CA5400769_002_002-202309101750 | ND |
| 2023-09-17 | CA5400769_002_002-202309171930 | 2.10 ppm |
| 2023-09-26 | CA5400769_002_002-202309261915 | ND |
| 2023-10-01 | CA5400769_002_002-202310010615 | 3.00 ppm |
| 2023-10-10 | CA5400769_001_001-202310100640 | 15.3 ppm |
| 2023-10-10 | CA5400769_002_002-202310100635 | 3.10 ppm |
| 2023-10-15 | CA5400769_002_002-202310151630 | 2.10 ppm |
| 2023-10-22 | CA5400769_002_002-202310221715 | 3.60 ppm |
| 2023-10-31 | CA5400769_002_002-202310311500 | 4.00 ppm |
| 2023-11-05 | CA5400769_001_001-202311050800 | 15.1 ppm |
| 2023-11-05 | CA5400769_002_002-202311050755 | 3.20 ppm |
| 2023-11-14 | CA5400769_002_002-202311141200 | 3.00 ppm |
| 2023-11-21 | CA5400769_002_002-202311211000 | 1.90 ppm |
| 2023-11-28 | CA5400769_002_002-202311280900 | 1.60 ppm |
| 2023-12-04 | CA5400769_001_001-202312040630 | 14.1 ppm |
| 2023-12-14 | CA5400769_002_002-202312140930 | 1.60 ppm |
| 2023-12-18 | CA5400769_002_002-202312180915 | ND |
| 2023-12-28 | CA5400769_002_002-202312280730 | 2.00 ppm |