Nitrate
Golden Water Supply Corporation
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 |
|---|---|---|---|---|
| 2014 | 0.0344 ppm | 5 | 5 | 0.0240 ppm - 0.0485 ppm |
| 2015 | 0.0388 ppm | 5 | 5 | 0.0215 ppm - 0.0585 ppm |
| 2016 | 0.0343 ppm | 6 | 5 | ND - 0.0500 ppm |
| 2017 | 0.0346 ppm | 7 | 6 | ND - 0.0565 ppm |
| 2018 | 0.0296 ppm | 7 | 5 | ND - 0.0545 ppm |
| 2019 | 0.0303 ppm | 7 | 5 | ND - 0.0524 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 |
|---|---|---|
| 2014-04-10 | Q1411567009 | 0.0300 ppm |
| 2014-04-10 | Q1411567008 | 0.0485 ppm |
| 2014-04-10 | Q1411567007 | 0.0240 ppm |
| 2014-04-10 | Q1411567006 | 0.0305 ppm |
| 2014-04-10 | Q1411567001 | 0.0390 ppm |
| 2015-01-20 | Q1501677017 | 0.0585 ppm |
| 2015-01-20 | Q1501677016 | 0.0325 ppm |
| 2015-01-20 | Q1501677018 | 0.0215 ppm |
| 2015-01-20 | Q1501677019 | 0.0345 ppm |
| 2015-01-20 | Q1501677021 | 0.0470 ppm |
| 2016-05-19 | Q1619901024 | ND |
| 2016-05-19 | Q1619901017 | 0.0450 ppm |
| 2016-05-19 | Q1619901016 | 0.0455 ppm |
| 2016-05-19 | Q1619901015 | 0.0270 ppm |
| 2016-05-19 | Q1619901014 | 0.0500 ppm |
| 2016-05-19 | Q1619901013 | 0.0380 ppm |
| 2017-01-12 | Q1701777002 | 0.0270 ppm |
| 2017-03-08 | Q1709807017 | 0.0412 ppm |
| 2017-03-08 | Q1709807044 | 0.0565 ppm |
| 2017-03-08 | Q1709807016 | 0.0531 ppm |
| 2017-03-08 | Q1709807040 | 0.0282 ppm |
| 2017-03-08 | Q1709807015 | 0.0362 ppm |
| 2017-09-06 | Q1741266004 | ND |
| 2018-03-12 | Q1809884007 | 0.0348 ppm |
| 2018-03-12 | Q1809884006 | 0.0519 ppm |
| 2018-03-12 | Q1809884023 | 0.0545 ppm |
| 2018-03-12 | Q1809884008 | 0.0313 ppm |
| 2018-03-12 | Q1809884024 | 0.0347 ppm |
| 2018-03-12 | Q1809884009 | ND |
| 2018-09-17 | Q1836805004 | ND |
| 2019-06-11 | Q1934245018 | ND |
| 2019-06-11 | Q1934245001 | 0.0524 ppm |
| 2019-06-11 | Q1934245025 | ND |
| 2019-06-11 | Q1934245024 | 0.0444 ppm |
| 2019-06-11 | Q1934245023 | 0.0270 ppm |
| 2019-06-11 | Q1934245022 | 0.0503 ppm |
| 2019-06-11 | Q1934245021 | 0.0383 ppm |