Nitrate
City of Granbury
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | 0.408 ppm | 14 | 13 | ND - 1.50 ppm |
| 2015 | 0.442 ppm | 13 | 11 | ND - 1.40 ppm |
| 2016 | 0.343 ppm | 12 | 12 | 0.0515 ppm - 1.01 ppm |
| 2017 | 0.568 ppm | 18 | 18 | 0.0420 ppm - 3.78 ppm |
| 2018 | 0.379 ppm | 18 | 15 | ND - 0.926 ppm |
| 2019 | 0.275 ppm | 17 | 17 | 0.0126 ppm - 0.896 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 |
|---|---|---|
| 2014-02-26 | Q1406448008 | 0.0470 ppm |
| 2014-07-09 | Q1426808014 | 1.50 ppm |
| 2014-07-09 | Q1426808011 | 0.0565 ppm |
| 2014-07-09 | Q1426808012 | 0.372 ppm |
| 2014-07-09 | Q1426808013 | 0.108 ppm |
| 2014-07-09 | Q1426808016 | 0.0550 ppm |
| 2014-07-09 | Q1426808017 | 1.41 ppm |
| 2014-07-09 | Q1426808018 | 0.248 ppm |
| 2014-07-09 | Q1426808019 | 0.397 ppm |
| 2014-07-09 | Q1426808020 | 1.44 ppm |
| 2014-07-09 | Q1426808054 | 0.01000 ppm |
| 2014-07-09 | Q1426808051 | ND |
| 2014-10-22 | Q1453503011 | 0.0605 ppm |
| 2014-10-22 | Q1453503001 | 0.0145 ppm |
| 2015-06-18 | Q1522872001 | 1.05 ppm |
| 2015-06-18 | Q1522872002 | 0.114 ppm |
| 2015-06-18 | Q1522872003 | ND |
| 2015-06-18 | Q1522872004 | 1.40 ppm |
| 2015-06-18 | Q1522872005 | 0.138 ppm |
| 2015-06-18 | Q1522966022 | 0.102 ppm |
| 2015-06-18 | Q1522966023 | 0.0330 ppm |
| 2015-06-18 | Q1522872006 | ND |
| 2015-06-18 | Q1522966021 | 0.386 ppm |
| 2015-11-16 | Q1544817004 | 0.0750 ppm |
| 2015-11-16 | Q1544817003 | 1.10 ppm |
| 2015-11-16 | Q1544817002 | 0.218 ppm |
| 2015-11-16 | Q1544817001 | 1.13 ppm |
| 2016-01-14 | Q1601671015 | 0.164 ppm |
| 2016-01-14 | Q1601671012 | 1.01 ppm |
| 2016-01-14 | Q1601671013 | 0.170 ppm |
| 2016-01-14 | Q1601671014 | 0.0675 ppm |
| 2016-01-14 | Q1601672001 | 0.328 ppm |
| 2016-01-14 | Q1601672002 | 0.130 ppm |
| 2016-01-14 | Q1601672003 | 0.847 ppm |
| 2016-01-14 | Q1601672004 | 0.258 ppm |
| 2016-05-31 | Q1621308003 | 0.182 ppm |
| 2016-05-31 | Q1621308002 | 0.816 ppm |
| 2016-11-30 | Q1652000009 | 0.0900 ppm |
| 2016-11-30 | Q1652000006 | 0.0515 ppm |
| 2017-07-06 | Q1727515036 | 0.403 ppm |
| 2017-09-19 | Q1744801017 | 3.78 ppm |
| 2017-09-19 | Q1744801047 | 0.0809 ppm |
| 2017-09-19 | Q1744801046 | 0.342 ppm |
| 2017-09-19 | Q1744801045 | 0.0690 ppm |
| 2017-09-19 | Q1744801019 | 0.0840 ppm |
| 2017-09-19 | Q1744801018 | 0.462 ppm |
| 2017-09-19 | Q1744801003 | 0.0830 ppm |
| 2017-09-19 | Q1744801002 | 0.887 ppm |
| 2017-10-04 | Q1748839016 | 0.0420 ppm |
| 2017-10-04 | Q1748839033 | 0.249 ppm |
| 2017-10-04 | Q1748839012 | 0.190 ppm |
| 2017-10-04 | Q1748839032 | 0.0612 ppm |
| 2017-10-04 | Q1748839031 | 0.182 ppm |
| 2017-10-04 | Q1748839014 | 0.931 ppm |
| 2017-10-04 | Q1748839013 | 0.152 ppm |
| 2017-10-04 | Q1748839011 | 0.903 ppm |
| 2017-10-04 | Q1748839003 | 1.32 ppm |
| 2018-01-22 | Q1802342015 | 0.797 ppm |
| 2018-01-22 | Q1802342010 | ND |
| 2018-05-02 | Q1817630008 | 0.238 ppm |
| 2018-05-02 | Q1817630021 | 0.726 ppm |
| 2018-05-02 | Q1817630006 | ND |
| 2018-05-02 | Q1817630020 | 0.0274 ppm |
| 2018-05-02 | Q1817630005 | 0.382 ppm |
| 2018-09-26 | Q1838636006 | 0.615 ppm |
| 2018-12-10 | Q1850473018 | 0.588 ppm |
| 2018-12-10 | Q1850473012 | 0.908 ppm |
| 2018-12-10 | Q1850473013 | 0.115 ppm |
| 2018-12-10 | Q1850473014 | 0.162 ppm |
| 2018-12-10 | Q1850473015 | 0.573 ppm |
| 2018-12-10 | Q1850473016 | 0.219 ppm |
| 2018-12-10 | Q1850473017 | 0.926 ppm |
| 2018-12-10 | Q1850473019 | 0.384 ppm |
| 2018-12-10 | Q1850473020 | ND |
| 2018-12-10 | Q1850473021 | 0.162 ppm |
| 2019-03-18 | Q1911097040 | 0.0224 ppm |
| 2019-03-18 | Q1911097026 | 0.569 ppm |
| 2019-03-18 | Q1911097027 | 0.131 ppm |
| 2019-03-18 | Q1911097037 | 0.0126 ppm |
| 2019-03-18 | Q1911097038 | 0.0842 ppm |
| 2019-03-18 | Q1911097039 | 0.132 ppm |
| 2019-03-18 | Q1911097001 | 0.142 ppm |
| 2019-03-18 | Q1911097002 | 0.238 ppm |
| 2019-03-18 | Q1911097003 | 0.524 ppm |
| 2019-03-18 | Q1911097004 | 0.0515 ppm |
| 2019-05-09 | Q1923093021 | 0.896 ppm |
| 2019-05-09 | Q1923093007 | 0.692 ppm |
| 2019-05-09 | Q1923093008 | 0.540 ppm |
| 2019-05-09 | Q1923093009 | 0.143 ppm |
| 2019-05-09 | Q1923093010 | 0.134 ppm |
| 2019-05-09 | Q1923093011 | 0.0905 ppm |
| 2019-09-04 | Q1962164001 | 0.267 ppm |