Nitrate
Lihue-Kapaa
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 | 0.421 ppm | 20 | 14 | ND - 1.30 ppm |
| 2015 | 0.432 ppm | 20 | 13 | ND - 1.20 ppm |
| 2016 | 0.504 ppm | 18 | 13 | ND - 1.80 ppm |
| 2017 | 0.425 ppm | 16 | 10 | ND - 1.000 ppm |
| 2018 | 0.546 ppm | 18 | 13 | ND - 1.90 ppm |
| 2019 | 0.512 ppm | 17 | 12 | ND - 1.30 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 |
|---|---|---|
| 2014-01-21 | C14-01-0003 | ND |
| 2014-01-21 | C14-01-0004 | 0.400 ppm |
| 2014-01-21 | C14-01-0005 | ND |
| 2014-01-21 | C14-01-0006 | 0.460 ppm |
| 2014-01-21 | C14-01-0007 | 0.810 ppm |
| 2014-01-21 | C14-01-0008 | 0.420 ppm |
| 2014-01-21 | C14-01-0009 | 0.520 ppm |
| 2014-01-21 | C14-01-0010 | 0.770 ppm |
| 2014-02-03 | C14-02-0001 | 0.400 ppm |
| 2014-02-03 | C14-02-0002 | 0.570 ppm |
| 2014-02-03 | C14-02-0003 | 0.360 ppm |
| 2014-02-03 | C14-02-0004 | 0.350 ppm |
| 2014-04-28 | C14-04-0213 | 0.860 ppm |
| 2014-04-28 | C14-04-0214 | 1.30 ppm |
| 2014-04-28 | C14-04-0215 | 0.490 ppm |
| 2014-04-28 | C14-04-0216 | ND |
| 2014-04-28 | C14-04-0217 | ND |
| 2014-04-28 | C14-04-0218 | ND |
| 2014-04-28 | C14-04-0219 | 0.710 ppm |
| 2014-04-28 | C14-04-0220 | ND |
| 2015-01-20 | C15-01-0006 | 0.680 ppm |
| 2015-01-20 | C15-01-0007 | 0.590 ppm |
| 2015-01-20 | C15-01-0008 | 0.300 ppm |
| 2015-01-20 | C15-01-0009 | ND |
| 2015-01-21 | C15-01-0024 | 0.860 ppm |
| 2015-01-21 | C15-01-0025 | 0.430 ppm |
| 2015-01-21 | C15-01-0026 | 0.530 ppm |
| 2015-01-21 | C15-01-0027 | ND |
| 2015-01-21 | C15-01-0028 | ND |
| 2015-03-16 | C15-03-0021 | 0.980 ppm |
| 2015-03-16 | C15-03-0022 | 1.20 ppm |
| 2015-03-16 | C15-03-0023 | 0.630 ppm |
| 2015-03-16 | C15-03-0024 | 0.410 ppm |
| 2015-03-18 | C15-03-0065 | 0.470 ppm |
| 2015-03-18 | C15-03-0066 | ND |
| 2015-03-18 | C15-03-0067 | ND |
| 2015-03-18 | C15-03-0068 | ND |
| 2015-03-18 | C15-03-0069 | ND |
| 2015-03-18 | C15-03-0070 | 0.770 ppm |
| 2015-09-10 | 201509120214 | 0.790 ppm |
| 2016-03-07 | ND | |
| 2016-03-07 | 0.980 ppm | |
| 2016-03-07 | 1.20 ppm | |
| 2016-03-07 | 0.770 ppm | |
| 2016-03-09 | ND | |
| 2016-03-09 | ND | |
| 2016-03-09 | 0.460 ppm | |
| 2016-03-09 | ND | |
| 2016-03-21 | 0.430 ppm | |
| 2016-03-21 | 0.560 ppm | |
| 2016-03-21 | 0.310 ppm | |
| 2016-03-21 | 0.310 ppm | |
| 2016-03-22 | ND | |
| 2016-03-22 | 0.380 ppm | |
| 2016-03-22 | 1.80 ppm | |
| 2016-04-04 | 0.850 ppm | |
| 2016-04-04 | 0.520 ppm | |
| 2016-04-04 | 0.500 ppm | |
| 2017-01-23 | ND | |
| 2017-01-23 | ND | |
| 2017-01-23 | ND | |
| 2017-01-23 | ND | |
| 2017-01-23 | 0.820 ppm | |
| 2017-01-25 | 0.460 ppm | |
| 2017-01-25 | 0.990 ppm | |
| 2017-01-25 | 1.000 ppm | |
| 2017-02-13 | ND | |
| 2017-02-13 | 0.390 ppm | |
| 2017-02-13 | ND | |
| 2017-02-15 | 0.790 ppm | |
| 2017-02-15 | 0.500 ppm | |
| 2017-02-15 | 0.710 ppm | |
| 2017-02-15 | 0.520 ppm | |
| 2017-02-15 | 0.620 ppm | |
| 2018-01-16 | C18-01-0023 | ND |
| 2018-01-16 | C18-01-0024 | ND |
| 2018-01-16 | C18-01-0025 | ND |
| 2018-01-16 | C18-01-0026 | 0.450 ppm |
| 2018-01-17 | C18-01-0027 | ND |
| 2018-01-17 | C18-01-0028 | 0.800 ppm |
| 2018-04-30 | C18-05-0005 | 1.90 ppm |
| 2018-04-30 | C18-05-0012 | 0.620 ppm |
| 2018-04-30 | C18-05-0003 | 1.000 ppm |
| 2018-04-30 | C18-05-0004 | 1.20 ppm |
| 2018-04-30 | C18-05-0008 | 0.830 ppm |
| 2018-04-30 | C18-05-0007 | ND |
| 2018-04-30 | C18-05-0011 | 0.650 ppm |
| 2018-04-30 | C18-05-0010 | 0.660 ppm |
| 2018-04-30 | C18-05-0009 | 0.500 ppm |
| 2018-04-30 | C18-05-0006 | 0.400 ppm |
| 2018-07-12 | 201807000000 | 0.410 ppm |
| 2018-07-12 | 201807130880 | 0.410 ppm |
| 2019-02-13 | C19-02-0141 | ND |
| 2019-02-13 | C19-02-0142 | 0.810 ppm |
| 2019-02-13 | C19-02-0143 | ND |
| 2019-02-13 | C19-02-0144 | ND |
| 2019-02-13 | C19-02-0145 | ND |
| 2019-03-11 | C19-03-0027 | 1.000 ppm |
| 2019-03-11 | C19-03-0028 | 1.20 ppm |
| 2019-03-11 | C19-03-0029 | ND |
| 2019-03-11 | C19-03-0030 | 0.970 ppm |
| 2019-03-11 | C19-03-0031 | 0.400 ppm |
| 2019-03-12 | C19-03-0052 | 0.350 ppm |
| 2019-03-12 | C19-03-0045 | 1.30 ppm |
| 2019-03-12 | C19-03-0054 | 0.580 ppm |
| 2019-03-12 | C19-03-0049 | 0.840 ppm |
| 2019-03-12 | C19-03-0053 | 0.340 ppm |
| 2019-03-12 | C19-03-0051 | 0.380 ppm |
| 2019-03-12 | C19-03-0050 | 0.540 ppm |